JP6276146B2 - Belt press type dehydrator - Google Patents

Belt press type dehydrator Download PDF

Info

Publication number
JP6276146B2
JP6276146B2 JP2014183158A JP2014183158A JP6276146B2 JP 6276146 B2 JP6276146 B2 JP 6276146B2 JP 2014183158 A JP2014183158 A JP 2014183158A JP 2014183158 A JP2014183158 A JP 2014183158A JP 6276146 B2 JP6276146 B2 JP 6276146B2
Authority
JP
Japan
Prior art keywords
filter cloth
cleaning
belt
gas
sludge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2014183158A
Other languages
Japanese (ja)
Other versions
JP2016055247A (en
JP2016055247A5 (en
Inventor
本間 康弘
康弘 本間
博義 山口
博義 山口
信雄 石黒
信雄 石黒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swing Corp
Original Assignee
Swing Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swing Corp filed Critical Swing Corp
Priority to JP2014183158A priority Critical patent/JP6276146B2/en
Publication of JP2016055247A publication Critical patent/JP2016055247A/en
Publication of JP2016055247A5 publication Critical patent/JP2016055247A5/ja
Application granted granted Critical
Publication of JP6276146B2 publication Critical patent/JP6276146B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Treatment Of Sludge (AREA)
  • Filtration Of Liquid (AREA)

Description

本発明は、上下水処理、産業廃水処理等の水処理において発生する汚泥を連続的に脱水するベルトプレス型脱水装置の濾布ベルトの洗浄に係わるものであり、ベルトプレス型脱水装置の濾布ベルトの洗浄に気体と液体とを混合した気液混合ミストを噴射する二流体ノズルを用いたベルトプレス型脱水装置に関するものである。   The present invention relates to cleaning of a filter cloth belt of a belt press type dehydrator that continuously dewaters sludge generated in water treatment such as water and sewage treatment, industrial wastewater treatment, and the like. The present invention relates to a belt press type dehydrating apparatus using a two-fluid nozzle for injecting a gas-liquid mixed mist obtained by mixing gas and liquid for cleaning a belt.

従来、ベルトプレス型脱水装置は各種の汚泥の脱水に広く採用されているが、高脱水効率を維持するためには運転中、常時、多量の洗浄水で濾布ベルトを洗浄する必要があり、洗浄水としての水道水、工業用水の確保や、洗浄廃水の処理が問題になることがある。   Conventionally, belt press-type dewatering devices have been widely used for various types of sludge dewatering, but in order to maintain high dewatering efficiency, it is necessary to always wash the filter cloth belt with a large amount of washing water during operation. Securing tap water and industrial water as cleaning water, and treatment of cleaning wastewater may be problematic.

そのため、ベルトプレス型脱水装置の洗浄水削減の取り組みは従来から行われており、特許文献1や特許文献2では、ベルトプレス型脱水装置から排出される脱水濾液や濾布ベルト洗浄排水を回収し、清澄化した後、濾布ベルト洗浄水として再利用する方法が記載されている。また特許文献3や特許文献4では濾布ベルトに圧縮空気を噴射することで濾布ベルトの洗浄を行う方法が記載されている。特許文献4では圧縮空気に水分を添加して濾布ベルトの洗浄を行う方法も記載されている。   For this reason, efforts have been made in the past to reduce the washing water of the belt press type dehydrator. In Patent Document 1 and Patent Document 2, the dehydrated filtrate and filter cloth belt waste water discharged from the belt press type dehydrator are collected. A method of reusing as filter cloth belt washing water after clarification is described. Patent Document 3 and Patent Document 4 describe a method of cleaning a filter cloth belt by injecting compressed air onto the filter cloth belt. Patent Document 4 also describes a method of washing the filter cloth belt by adding moisture to compressed air.

実開平6−15893号公報Japanese Utility Model Publication No. 6-15893 特開平10−263889号公報JP-A-10-263889 特開2003−112199号公報JP 2003-112199 A 特開平11−221598号公報JP-A-11-221598

しかしながら、上記ベルトプレス型脱水装置の濾布ベルト洗浄に関する洗浄水削減の方法には以下のような問題点があった。
(1)ベルトプレス型脱水装置から排出される脱水濾液や濾布ベルト洗浄排水を回収し、清澄化した後、濾布ベルト洗浄水として再利用する方法(例えば特許文献1,2)では、脱水濾液中に混入するリークしたSS(浮遊固体)や、濾液中の残留ポリマを除去した上で濾布ベルト洗浄水として再利用する必要があるため、脱水濾液中のSSや残留ポリマを除去する設備が必要となり、その処理水量が多い程、脱水濾液中のSSや残留ポリマを除去する設備の運転管理、維持管理の負担が増大する。また、脱水濾液や濾布ベルト洗浄排水を再利用する方法においても、濾布ベルトの洗浄には多量の洗浄水を使用するため、設備腐食等の設備の劣化を早める可能性がある。そのため、濾布ベルト洗浄に使用する再利用水も含んだ洗浄水量自体を削減することが望まれている。
However, the method for reducing the washing water related to the washing of the filter cloth belt of the belt press type dehydrator has the following problems.
(1) In the method (for example, Patent Documents 1 and 2), the dewatered filtrate and the filter cloth belt washing drainage discharged from the belt press type dehydrator are collected and clarified, and then reused as filter cloth belt washing water. Equipment that removes SS and residual polymer in dehydrated filtrate because SS (floating solid) mixed in the filtrate and residual polymer in filtrate need to be removed and reused as filter cloth belt washing water As the amount of treated water increases, the burden of operation management and maintenance management of facilities for removing SS and residual polymer in the dehydrated filtrate increases. Also, in the method of reusing dehydrated filtrate and filter cloth belt washing wastewater, a large amount of washing water is used for washing the filter cloth belt, which may accelerate equipment deterioration such as equipment corrosion. Therefore, it is desired to reduce the amount of cleaning water itself including reused water used for cleaning the filter cloth belt.

(2)濾布ベルトの洗浄とは、濾布ベルト表面あるいは織目に食い込んだ微粒子を高圧で織目を通して洗い去ることであり、従って濾布ベルトの洗浄には強い貫通力を持った流体である水の使用が好ましい。一方引用文献3,4のように、濾布ベルト洗浄に圧縮空気のみを用いた場合では、従来の水を用いた洗浄に比べ、洗浄効果が乏しくなる傾向にあり、圧縮空気のみによる洗浄では汚泥微粒子を濾布ベルトから十分に洗い去ることは難しく、濾布ベルトが目詰まりし易くなる。そして、汚泥微粒子が残留した濾布ベルトで脱水操作を繰り返せば、含水率悪化等の脱水性能の低下を招き、安定した脱水処理の継続が困難になる。 (2) The cleaning of the filter cloth belt is to wash out fine particles that have penetrated the surface of the filter cloth belt or the texture through the texture at a high pressure. Therefore, the filter cloth belt is washed with a fluid having a strong penetrating force. The use of some water is preferred. On the other hand, when only compressed air is used for cleaning the filter cloth belt as in Cited Documents 3 and 4, the cleaning effect tends to be poor compared to the conventional cleaning using water. It is difficult to sufficiently wash the fine particles from the filter cloth belt, and the filter cloth belt is easily clogged. If the dewatering operation is repeated with the filter cloth belt in which the sludge fine particles remain, dehydration performance such as deterioration of the water content is lowered, and it is difficult to continue the stable dewatering treatment.

本発明は上述の点に鑑みてなされたものであり、濾布ベルトの洗浄に使用する洗浄水量を削減できると同時に、安定した脱水処理が継続可能なベルトプレス型脱水装置を提供することを目的とする。   The present invention has been made in view of the above points, and an object of the present invention is to provide a belt press type dehydrating apparatus that can reduce the amount of washing water used for washing a filter cloth belt and can continue a stable dehydration process. And

本発明は、一対の無端状の濾布ベルトをそれぞれ複数個のロールに走行可能に掛装し、前記両濾布ベルトの一部分同士を互いに対面平行して走行するように設置し、前記対面平行とした濾布ベルトの間に汚泥を挟圧して脱水するベルトプレス型脱水装置において、前記各濾布ベルトの表面に付着した前記脱水後の汚泥を剥離するスクレーパと、前記脱水後の汚泥を剥離した後の濾布ベルトの前記スクレーパよりも下流の洗浄位置に、気体と液体とを混合して噴霧打力を高めた気液混合ミストを噴射して濾布ベルトを洗浄する二流体ノズルを有する洗浄装置と、を設置し、前記一対の無端状の濾布ベルトの脱水ケーキが剥離した洗浄面を洗浄する際、前記二流体ノズルに供給する洗浄水全体の水量は、濾布ベルトの幅1m当り1.5m 3 /h以上で6.0m 3 /h未満、前記二流体ノズルに供給される気体圧力は、0.15〜0.5MPa、気体流量は、濾布ベルトの幅1m当り100〜300NL/min、前記濾布ベルトの送り速度は、0.5〜2m/minであり、前記洗浄装置は、前記濾布ベルトの進行方向に対して交差する幅方向に向かって前記二流体ノズルを複数個併設し、且つ隣り合う二流体ノズルが前記進行方向に対して前後であって各々の二流体ノズルから脱水ケーキの剥離した洗浄面へ噴射される気液混合ミストが重ならない2mm〜3cmの距離を空けて配置して構成されていることを特徴としている。 In the present invention, a pair of endless filter cloth belts are movably attached to a plurality of rolls, respectively, and a part of the two filter cloth belts are installed so as to run in parallel with each other. In a belt press-type dewatering device that dewaters by sandwiching sludge between the filter cloth belts, a scraper that peels off the dewatered sludge adhering to the surface of each filter cloth belt, and the dewatered sludge And a two-fluid nozzle for cleaning the filter cloth belt by injecting a gas-liquid mixed mist in which gas and liquid are mixed to increase the spray hitting force at a cleaning position downstream of the scraper of the filter cloth belt after the cleaning. When the cleaning surface from which the dehydrated cake of the pair of endless filter cloth belts is separated is cleaned, the total amount of cleaning water supplied to the two-fluid nozzle is 1 m in width of the filter cloth belt. per 1.5m 3 / h or more In 6.0 m 3 / below h, the gas pressure supplied to the two-fluid nozzle, 0.15~0.5MPa, gas flow rate, width 1m per 100~300NL / min of filter cloth belt, the filter cloth belt The cleaning speed is 0.5 to 2 m / min, and the cleaning device includes a plurality of the two-fluid nozzles adjacent to each other in the width direction intersecting the traveling direction of the filter cloth belt. The two-fluid nozzles are arranged at a distance d of 2 to 3 cm so that the gas-liquid mixed mist ejected from each of the two-fluid nozzles to the cleaning surface from which the dehydrated cake is peeled does not overlap with each other. It is characterized by being composed.

なお、二流体ノズルを複数個設置するのは、一方の濾布ベルトに対してだけでも良い。この場合、もう一方の濾布ベルトに対しては、1つの二流体ノズルを設置するか、或いは二流体ノズルを設置しない、または、従来の洗浄水用洗浄ノズルを取り付けるという選択もできる。また二流体ノズルとしては、そのスプレーパターン(噴霧形状)が楕円形状(扁平形状、即ち一方の方向に長くてそれに直交する方向の厚みが薄い形状)であるものが好ましい。噴霧の長手方向が、濾布ベルトの進行方向に対して略直交する方向を向くようにセットすれば、少ない数の二流体ノズルで効率よく濾布ベルト全体を洗浄することができる。また1つの濾布ベルトに対して1個又は少数個の二流体ノズルを設置した際に、洗浄範囲が濾布ベルトの幅に足りないような場合は、この二流体ノズルを濾布ベルトの幅方向に往復動させるように構成しても良い。   A plurality of two-fluid nozzles may be installed only on one filter cloth belt. In this case, for the other filter cloth belt, one two-fluid nozzle can be installed, or no two-fluid nozzle can be installed, or a conventional washing water washing nozzle can be installed. The two-fluid nozzle preferably has an oval shape (a flat shape, ie, a shape that is long in one direction and thin in a direction perpendicular thereto). If the spray is set so that the longitudinal direction of the spray is oriented in a direction substantially perpendicular to the traveling direction of the filter cloth belt, the entire filter cloth belt can be efficiently washed with a small number of two fluid nozzles. In addition, when one or a small number of two-fluid nozzles are installed for one filter cloth belt, if the cleaning range is not enough for the width of the filter cloth belt, the two-fluid nozzle is set to the width of the filter cloth belt. It may be configured to reciprocate in the direction.

このように本発明は、二流体ノズルを用い、液体(水など)と気体(空気など)とを混合して液体の微粒化を図った気液混合ミストを噴射して、濾布ベルトの洗浄を行うものである(以下、「空気(気体)−水(液体)併用洗浄」とも記す)。二流体ノズルにより液体と気体とを混合した気液混合ミストは、液体単独の場合に比べ噴霧打力が高まる。このため洗浄液単独の場合に比べて少ない洗浄液量であっても、濾布ベルト表面あるいは織目に食い込んだ微粒子を気液混合ミストの有する強い貫通力により、織目を通して洗い去ることで、濾布ベルトの洗浄を行うことができる。そのため、濾布ベルトの洗浄に気体と液体とを混合した気液混合ミストを噴射する上記二流体ノズルを使用することで、濾布ベルト洗浄液量を大幅に削減することが可能となる。つまり本発明に係るベルトプレス型脱水装置によれば、濾布ベルトの洗浄に使用する洗浄液量を削減できると同時に、安定した脱水処理が継続可能となる。   As described above, the present invention uses a two-fluid nozzle to inject a gas-liquid mixed mist that mixes a liquid (such as water) and a gas (such as air) to atomize the liquid to clean the filter cloth belt. (Hereinafter also referred to as “air (gas) -water (liquid) combined cleaning”). A gas-liquid mixed mist obtained by mixing a liquid and a gas with a two-fluid nozzle has a higher spray hitting force than a liquid alone. For this reason, even if the amount of the cleaning liquid is small compared to the case of the cleaning liquid alone, the filter cloth can be washed away through the texture by the strong penetrating force of the gas-liquid mixed mist by the fine particles that have bitten into the surface of the filter cloth belt or the texture. The belt can be cleaned. Therefore, by using the above-mentioned two-fluid nozzle that jets a gas-liquid mixed mist obtained by mixing a gas and a liquid for cleaning the filter cloth belt, the amount of the filter cloth belt cleaning liquid can be greatly reduced. That is, according to the belt press-type dewatering apparatus according to the present invention, the amount of cleaning liquid used for cleaning the filter cloth belt can be reduced, and at the same time, stable dewatering processing can be continued.

ところで、前述の特許文献4の段落「0012」には、「圧縮空気に水分を含有させ」との記載があり、汚泥搬送ベルトを空気洗浄する場合に圧縮空気に水分の添加を行うことが記されている。しかしながら特許文献4の場合は、「圧縮空気に水分を含有させることで、無端状搬送ベルトに付着したスラッジに水分を含浸させ、無端状搬送ベルトに対する付着力を弱め、スラッジを除去し易くすると共に、スラッジの乾燥を防止してスラッジの周囲への飛散を防止している」(同段落「0012」)と記載され、また「洗浄水を添加する場合でも洗浄水はスラッジをほぐす程度に添加するだけで済むため、洗浄水で洗浄する従来の洗浄方法と比較して排水量を格段に抑制することができる」(同段落「0018」)と記載されているように、「洗浄水を添加する場合でも洗浄水はスラッジをほぐす程度に添加するだけ」の極小量の水を使用するだけであり、その目的は「スラッジに水分を含浸させ、無端状搬送ベルトに対する付着力を弱め、スラッジを除去し易くするとともに、スラッジの乾燥を防止してスラッジの周囲への飛散を防止している」ものである。従って本発明の二流体ノズルのように、気体と液体とを混合して噴霧打力を高めた気液混合ミスト(特許文献4の場合は噴霧打力を高めていない)を形成し、濾布ベルト表面あるいは織目に食い込んだ微粒子を気液混合ミストの有する強い貫通力により、織目を通して洗い去ることで、濾布ベルトの洗浄を行うという思想・構成とは全く異なる思想・構成である。   By the way, paragraph “0012” of the above-mentioned Patent Document 4 has a description “add moisture to the compressed air”, and it is described that moisture is added to the compressed air when the sludge transport belt is washed with air. Has been. However, in the case of Patent Document 4, “by adding moisture to the compressed air, the sludge adhering to the endless transport belt is impregnated with water, the adhesion to the endless transport belt is weakened, and the sludge is easily removed. ”Prevents the sludge from drying out and prevents the sludge from splashing around” (in the same paragraph “0012”), and “when washing water is added, the washing water is added to such an extent that the sludge is loosened. As it is described in the paragraph “0018” in the same paragraph, “when washing water is added” However, it is only necessary to use an extremely small amount of water that only adds sludge to loosen the sludge, and its purpose is to `` impregnate the sludge with moisture and increase its adhesion to the endless conveyor belt. '' Because, as to facilitate removal of the sludge, in which by preventing the drying of the sludge is prevented from scattering to the surroundings of the sludge. " Accordingly, as in the two-fluid nozzle of the present invention, a gas-liquid mixed mist (in the case of Patent Document 4, the spray hitting force is not increased) formed by mixing gas and liquid to increase the spray hitting force is formed. This is a completely different philosophy and configuration from the idea of cleaning the filter cloth belt by washing the fine particles that have penetrated into the belt surface or the weave through the texture by the strong penetrating force of the gas-liquid mixing mist.

またこのベルトプレス型脱水装置によれば、隣り合う二流体ノズルを、濾布ベルトの進行方向に対して前後に配置したので、各々の二流体ノズルから噴射される気液混合ミストを、容易に重ならないようにすることができる。これによって、気液混合ミストの接触、重なり合いによるお互いの気液混合ミストの噴霧打力の打ち消し合いが防止でき、高い洗浄効果を維持することができる。
また前記一対の濾布ベルトを洗浄する際の二流体ノズルに供給する洗浄水全体の水量は、濾布ベルトの幅1m当り1.5m /h以上で6.0m 3 /h未満である。実験によれば、この水量以上であれば、水のみをノズルから噴霧して濾布ベルトを十分洗浄できて継続的に安定した脱水処理が可能な場合(この場合の水量は多くなる)と比べて、同等な洗浄効果が得られた。なお、一対の濾布ベルト全体に対する総水量を規定しているので、脱水する汚泥の種類や装置の構造によって両濾布ベルトに付着する汚泥の量が異なる場合は、付着した汚泥の量が多い濾布ベルトに供給する水量を多くし、汚泥の量が少ない濾布ベルトに供給する水量を少なくし、全体として幅1m当り1.5m /h以上で6.0m 3 /h未満とすればよい。
また前記濾布ベルトの送り速度は、0.5〜2m/minである。実験によれば、この送り速度の範囲内であれば、上記二流体ノズルを使用することで、洗浄水量を削減することができた。
Also, according to this belt press type dewatering device, the adjacent two-fluid nozzles are arranged in front and rear with respect to the traveling direction of the filter cloth belt, so that the gas-liquid mixing mist ejected from each two-fluid nozzle can be easily It can be made not to overlap. Thereby, the canceling of the spray hitting force of the gas-liquid mixed mist due to the contact and overlapping of the gas-liquid mixed mist can be prevented, and a high cleaning effect can be maintained.
The water of the whole washing water supplied to the two-fluid nozzle at the time of cleaning the pair of filter cloth belts are 6.0m less than 3 / h with a filter cloth belt width 1m per 1.5 m 3 / h or more. According to experiments, if the amount of water is more than this amount, the filter cloth belt can be sufficiently washed by spraying only water from the nozzle, and stable dehydration is possible (in this case, the amount of water increases). Thus, an equivalent cleaning effect was obtained. Since the total amount of water for the entire pair of filter cloth belts is specified, if the amount of sludge adhering to both filter cloth belts differs depending on the type of sludge to be dehydrated and the structure of the device, the amount of adhering sludge is large. by increasing the amount of water supplied to the filter cloth belt, to reduce the amount of water supplied to the filter cloth belt small amount of sludge, if 6.0 m 3 / less than h across the width 1m per 1.5 m 3 / h or more Good.
The feeding speed of the filter cloth belt is 0.5 to 2 m / min. According to the experiment, it was possible to reduce the amount of washing water by using the two-fluid nozzle within the range of the feed rate.

また本発明は、前記複数の二流体ノズルを併設した洗浄装置が、前記一対の濾布ベルトにそれぞれ設置されていることを特徴としている。これによって、両方の濾布ベルトを効果的に洗浄できる。 The present invention, the plurality of two-fluid nozzle features the cleaning equipment is characterized by being Installation respectively to the pair of filter cloth belts. Thereby, both filter cloth belts can be washed effectively.

また本発明は、前記噴射された気液混合ミストが、スリット状の噴射孔の形状に応じて広角扇形で、且つ噴霧厚さが薄いスプレーパターンとなり、該スプレーパターン全域にわたって粒径が均等で、空気量及び液量共に略均等となり、前記スリット状の噴射孔の長さ方向の噴射角度(広がり角度)αは60°〜80°に構成されていることが好ましい。Further, in the present invention, the sprayed gas-liquid mixed mist is a wide-angle fan-shaped spray pattern according to the shape of the slit-shaped spray hole, and the spray thickness is thin, and the particle size is uniform over the entire spray pattern. It is preferable that the air amount and the liquid amount are substantially equal, and the injection angle (spreading angle) α in the length direction of the slit-like injection hole is configured to be 60 ° to 80 °.
また本発明は、一対の無端状の濾布ベルトをそれぞれ複数個のロールに走行可能に掛装し、前記両濾布ベルトの一部分同士を互いに対面平行して走行するように設置し、前記対面平行とした濾布ベルトの間に汚泥を挟圧して脱水するベルトプレス型脱水装置において、前記各濾布ベルトの表面に付着した前記脱水後の汚泥を剥離するスクレーパと、前記脱水後の汚泥を剥離した後の濾布ベルトの前記スクレーパよりも下流の洗浄位置に、気体と液体とを混合して噴霧打力を高めた気液混合ミストをスリット状の噴射孔より噴射して脱水ケーキの剥離した洗浄面の濾布ベルトを洗浄する二流体ノズルを有する洗浄装置と、を設置し、前記一対の無端状の濾布ベルトの脱水ケーキが剥離した洗浄面を洗浄する際、前記二流体ノズルに供給する洗浄水全体の水量は、濾布ベルトの幅1m当り1.5mFurther, the present invention is provided such that a pair of endless filter cloth belts are movably attached to a plurality of rolls, and a part of the two filter cloth belts are installed so as to run in parallel with each other. In a belt press type dewatering device for dewatering by sandwiching sludge between parallel filter cloth belts, a scraper for separating the dewatered sludge adhering to the surface of each filter cloth belt, and the dewatered sludge The dewatered cake is peeled off by spraying a gas-liquid mixed mist, which is a mixture of gas and liquid and having a higher spray hitting force, into the cleaning position downstream of the scraper of the filter cloth belt after peeling, through a slit-like injection hole. A cleaning device having a two-fluid nozzle for cleaning the filter cloth belt of the cleaned surface, and when cleaning the cleaning surface from which the dehydrated cake of the pair of endless filter cloth belts has been separated, Supplied cleaning The entire amount of water, width 1m per 1.5m of filter cloth belt 3Three /h以上で6.0m/ M over 6.0m 3Three /h未満、前記二流体ノズルに供給される気体圧力は、0.15〜0.5MPa、気体流量は、濾布ベルトの幅1m当り100〜300NL/min、前記濾布ベルトの送り速度は、0.5〜2m/minであり、前記洗浄装置は、前記濾布ベルトの進行方向に対して交差する幅方向に向かって前記二流体ノズルを複数個併設し、且つ隣り合う二流体ノズルが前記進行方向に対して前後であって各々の二流体ノズルから噴射される気液混合ミストが重ならない距離を空けて配置し、前記噴射された気液混合ミストが、噴射孔の形状に応じて広角扇形で、且つ噴霧厚さが薄いスプレーパターンとなり、該スプレーパターン全域にわたって粒径が均等で、空気量及び液量共に略均等となり、前記スリット状の噴射孔の長さ方向の噴射角度(広がり角度)αは60°〜80°に構成されていることを特徴としている。/ H, the gas pressure supplied to the two-fluid nozzle is 0.15 to 0.5 MPa, the gas flow rate is 100 to 300 NL / min per 1 m of the width of the filter cloth belt, and the feed speed of the filter cloth belt is 0.5 to 2 m / min, and the cleaning device includes a plurality of the two-fluid nozzles in the width direction intersecting the traveling direction of the filter cloth belt, and the adjacent two-fluid nozzles are The gas-liquid mixed mist ejected from each two-fluid nozzle is arranged at a distance before and after the traveling direction so as not to overlap, and the ejected gas-liquid mixed mist has a wide angle according to the shape of the ejection hole. The spray pattern has a fan shape and a thin spray thickness, the particle size is uniform over the entire spray pattern, the air volume and the liquid volume are approximately equal, and the spray angle in the length direction of the slit-shaped spray hole (spread) Degrees) alpha is characterized by being configured to 60 ° to 80 °.

本発明によれば、気体と液体とを混合して噴霧打力を高めた気液混合ミストを噴射する二流体ノズルを使用するので、洗浄水単独でミストを噴射する場合に比べ、少ない洗浄水量であっても、濾布ベルトの洗浄を確実に行うことができる。即ち、濾布ベルト洗浄水量を削減することが可能となる。また本発明によれば、隣り合う二流体ノズルを濾布ベルトの進行方向に対して前後に配置したので、お互いの気液混合ミストの噴霧打力の打ち消し合いを防止でき、高い洗浄効果を容易に維持できる。   According to the present invention, since the two-fluid nozzle for injecting the gas-liquid mixed mist in which the gas and the liquid are mixed to increase the spray hitting force is used, the amount of the cleaning water is smaller than in the case of injecting the mist with the cleaning water alone. Even so, the filter cloth belt can be reliably washed. That is, it becomes possible to reduce the amount of filter cloth belt washing water. Further, according to the present invention, the adjacent two-fluid nozzles are arranged forward and backward with respect to the traveling direction of the filter cloth belt, so that it is possible to prevent the spray striking forces of the gas-liquid mixed mists from canceling each other and to easily achieve a high cleaning effect. Can be maintained.

ベルトプレス型脱水装置1及びその付帯設備の全体概略構成図である。1 is an overall schematic configuration diagram of a belt press-type dewatering device 1 and its associated equipment. 二流体ノズル60の一例を示す概略断面図である。4 is a schematic cross-sectional view showing an example of a two-fluid nozzle 60. FIG. 二流体ノズル60の先端部分のみを図2に示す矢印A方向から見た図である。It is the figure which looked at only the front-end | tip part of the two-fluid nozzle 60 from the arrow A direction shown in FIG. 洗浄装置60A(60B)の一例を示す概略斜視図である。It is a schematic perspective view which shows an example of cleaning apparatus 60A (60B). 洗浄装置60A(60B)によって濾布ベルト10(20)に噴霧された気液混合ミストの噴霧状態(スプレーパターンSP)を示す概略図である。It is the schematic which shows the spraying state (spray pattern SP) of the gas-liquid mixing mist sprayed on the filter cloth belt 10 (20) by the washing | cleaning apparatus 60A (60B).

以下、本発明の実施形態を図面を参照して詳細に説明する。
図1は本発明の一実施形態にかかるベルトプレス型脱水装置1及びその付帯設備の全体概略構成図である。同図に示すようにベルトプレス型脱水装置1は、一対(2枚)の無端状の濾布ベルト10,20を、それぞれ複数個のロールに走行可能に掛装して構成されている。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall schematic configuration diagram of a belt press-type dewatering apparatus 1 and its associated equipment according to an embodiment of the present invention. As shown in the figure, the belt press-type dewatering device 1 is configured by a pair (two sheets) of endless filter cloth belts 10 and 20 that are hangably mounted on a plurality of rolls.

濾布ベルト10は、4つの圧搾ロール31,33,35,37と、3つのロール39,41,43に巻き掛けられ、十分な張力で張設されている。一方濾布ベルト20は、4つの圧搾ロール31,33,35,37と、3つのロール45,47,49に巻き掛けられ、十分な張力で張設されている。濾布ベルト10,20としては、一般に使用されている合成樹脂(この例ではポリエステル)製のフィルタークロスを用いている。   The filter cloth belt 10 is wound around four pressing rolls 31, 33, 35, 37 and three rolls 39, 41, 43, and is stretched with sufficient tension. On the other hand, the filter cloth belt 20 is wound around four pressing rolls 31, 33, 35, 37 and three rolls 45, 47, 49, and is stretched with sufficient tension. As the filter cloth belts 10 and 20, a filter cloth made of a synthetic resin (polyester in this example) which is generally used is used.

圧搾ロール31,33,35,37は、2枚の濾布ベルト10,20の一部分同士が狭い間隔で互いに対面平行して走行するように設置されている。その他のロール39〜49は、濾布ベルト10,20を緊張したり、蛇行を修正したりする等の目的で、所望の位置に設置されている。   The squeezing rolls 31, 33, 35, 37 are installed so that parts of the two filter cloth belts 10, 20 run parallel to each other at a narrow interval. The other rolls 39 to 49 are installed at desired positions for the purpose of tensioning the filter cloth belts 10 and 20 or correcting meandering.

下側に設置された濾布ベルト20の汚泥投入側の上面には汚泥投入器51が設置されている。一方両濾布ベルト10,20の汚泥排出側には、各濾布ベルト10,20の表面に付着した脱水後の汚泥を引き剥がすスクレーパ53,55が設置され、さらに各濾布ベルト10,20の前記スクレーパ53,55よりも下流側の位置には、それぞれ濾布ベルト10,20を洗浄する洗浄装置60A,60Bが設置されている。洗浄装置60A,60Bは、それぞれ複数の二流体ノズル60を濾布ベルト10,20の幅方向に併設して構成されている。   A sludge feeder 51 is installed on the upper surface of the filter cloth belt 20 installed on the lower side on the sludge inlet side. On the other hand, on the sludge discharge side of both filter cloth belts 10 and 20, scrapers 53 and 55 for removing the dewatered sludge adhering to the surfaces of the filter cloth belts 10 and 20 are installed. Cleaning devices 60A and 60B for cleaning the filter cloth belts 10 and 20 are installed at positions downstream of the scrapers 53 and 55, respectively. The cleaning devices 60 </ b> A and 60 </ b> B are configured by arranging a plurality of two-fluid nozzles 60 in the width direction of the filter cloth belts 10 and 20, respectively.

図2は1つの二流体ノズル60の一例を示す概略断面図、図3は二流体ノズル60の先端部分のみを図2に示す矢印A方向から見た図である。両図に示すように二流体ノズル60は、気体と液体を混合するノズル本体61と、ノズル本体61の先端に取り付けられ気液混合流体を噴出するノズル63と、前記ノズル本体61の側面に取り付けられノズル本体61に液体を供給する液体供給部材65とを具備して構成されている。   2 is a schematic cross-sectional view showing an example of one two-fluid nozzle 60, and FIG. 3 is a view of only the tip portion of the two-fluid nozzle 60 as seen from the direction of arrow A shown in FIG. As shown in both figures, the two-fluid nozzle 60 is attached to a nozzle body 61 that mixes gas and liquid, a nozzle 63 that is attached to the tip of the nozzle body 61 and ejects a gas-liquid mixed fluid, and a side surface of the nozzle body 61. And a liquid supply member 65 for supplying a liquid to the nozzle body 61.

ノズル本体61内には軸線方向に向かって主流路67が形成され、主流路67は、上流側から気体導入部69、オリフィス部71、気液混合部73、混合室75を具備している。混合室75は気液混合部73よりもその内径を大きくしている。液体供給部材65内には、前記主流路67と交差する方向を向く液体流路77が貫通して設けられ、その上流側は液体導入部79であり、下流側はノズル本体61に設けた第2オリフィス部81に連通している。第2オリフィス81は気液混合部73に開口、連通している。ノズル63内には、前記主流路67の混合室75に連通するドーム形状の孔83と、この孔83と先端面間を連通する噴射孔85とを設けている。孔83の内径は前記混合室75の内径よりも小さく、これによって段差面87が形成されている。噴射孔85はスリット状でテーパ状に広がる形状に形成されている。即ち噴射孔85は図3に示すように、細長いスリット状で、孔83側からの広がり角度αを60°としている。   A main flow path 67 is formed in the nozzle body 61 in the axial direction, and the main flow path 67 includes a gas introduction part 69, an orifice part 71, a gas-liquid mixing part 73, and a mixing chamber 75 from the upstream side. The mixing chamber 75 has an inner diameter larger than that of the gas-liquid mixing unit 73. In the liquid supply member 65, a liquid channel 77 is provided penetrating in a direction crossing the main channel 67, the upstream side of which is a liquid introduction part 79, and the downstream side is provided in a nozzle body 61. Two orifices 81 are communicated. The second orifice 81 opens and communicates with the gas-liquid mixing unit 73. In the nozzle 63, a dome-shaped hole 83 communicating with the mixing chamber 75 of the main channel 67 and an injection hole 85 communicating between the hole 83 and the tip surface are provided. The inner diameter of the hole 83 is smaller than the inner diameter of the mixing chamber 75, thereby forming a stepped surface 87. The injection hole 85 is formed in a slit shape that is tapered. That is, as shown in FIG. 3, the injection hole 85 has an elongated slit shape, and the spread angle α from the hole 83 side is 60 °.

ノズル本体61の気体導入部69には気体供給管89が接続され、気体供給管89の上流側には、空気流量計91、調圧器93、コンプレッサ95が接続されている。液体供給部材65の液体導入部79には液体供給管97が接続され、液体供給管97の上流側には、流量計99、洗浄水ポンプ101、洗浄水タンク103が接続されている。洗浄水としては、水道水や工水、生物処理水などが使用可能である。さらにベルトプレス型脱水装置1から排出される脱水濾液や濾布ベルト洗浄排水を回収し、清澄化した後、これを洗浄水として再利用しても良い。洗浄排水を再利用する場合には、二流体ノズル60の閉塞を引き起こさないように、洗浄排水中のSSを除去する必要がある。洗浄排水中のSSを除去する設備としては、ろ過装置、ろ過フィルター、膜ろ過装置、加圧浮上分離装置などが適用できる。   A gas supply pipe 89 is connected to the gas introduction part 69 of the nozzle body 61, and an air flow meter 91, a pressure regulator 93, and a compressor 95 are connected to the upstream side of the gas supply pipe 89. A liquid supply pipe 97 is connected to the liquid introduction part 79 of the liquid supply member 65, and a flow meter 99, a washing water pump 101, and a washing water tank 103 are connected to the upstream side of the liquid supply pipe 97. As cleaning water, tap water, industrial water, biologically treated water, or the like can be used. Furthermore, after the dehydrated filtrate and the filter cloth belt drainage discharged from the belt press type dehydrator 1 are collected and clarified, they may be reused as washing water. When the cleaning wastewater is reused, it is necessary to remove SS in the cleaning wastewater so as not to cause the two-fluid nozzle 60 to be blocked. As equipment for removing SS in the washing waste water, a filtration device, a filtration filter, a membrane filtration device, a pressurized flotation separation device, and the like can be applied.

以上説明したように、この二流体ノズル60は、気体導入部69と液体導入部79と気液混合部73と噴射孔85とを一体に設けた構造となっている。   As described above, the two-fluid nozzle 60 has a structure in which the gas introduction part 69, the liquid introduction part 79, the gas-liquid mixing part 73, and the injection hole 85 are integrally provided.

図4は複数個の二流体ノズル60を有する洗浄装置60A(60B)の一例を示す概略斜視図、図5は前記洗浄装置60A(60B)によって濾布ベルト10(20)に噴霧された気液混合ミストの噴霧状態(スプレーパターンSP)を示す概略図である。これらの図に示すように二流体ノズル60は、濾布ベルト10(20)の幅方向〔濾布ベルト10(20)の進行方向(長手方向)に交差する方向〕に向けて複数個設置されている。そして各々の二流体ノズル60から噴射される気液混合ミストが重ならないように、隣り合う二流体ノズル60は濾布ベルト10(20)の進行方向に対して前後に互い違いに配置されている。その理由は、一つの二流体ノズル60から噴射される気液混合ミストと他の二流体ノズル60から噴射される気液混合ミストが接触し、重なり合うと、気液混合ミストが重なった箇所でお互いの気液混合ミストの噴霧打力を打ち消し合い、その箇所での濾布ベルト10(20)の洗浄効果が得られにくいためである。前後に配置した二流体ノズル60間の距離dは、二流体ノズル60の形状にもよるが、2mm〜3cmが適切である。距離dが小さ過ぎると二流体ノズル60から噴射される気液混合ミスト同士が接触し、噴霧打力を打ち消し合い、洗浄効果が発揮できないためであり、距離dが大きい場合は、洗浄効果を発揮することは可能であるが、洗浄装置が過大になるためである。   FIG. 4 is a schematic perspective view showing an example of a cleaning device 60A (60B) having a plurality of two-fluid nozzles 60, and FIG. 5 is a gas-liquid sprayed on the filter cloth belt 10 (20) by the cleaning device 60A (60B). It is the schematic which shows the spraying state (spray pattern SP) of mixed mist. As shown in these drawings, a plurality of two-fluid nozzles 60 are installed in the width direction of the filter cloth belt 10 (20) [direction intersecting the traveling direction (longitudinal direction) of the filter cloth belt 10 (20)]. ing. Adjacent two-fluid nozzles 60 are alternately arranged in the front-rear direction with respect to the traveling direction of the filter cloth belt 10 (20) so that the gas-liquid mixing mists ejected from the two-fluid nozzles 60 do not overlap. The reason is that the gas-liquid mixed mist ejected from one two-fluid nozzle 60 and the gas-liquid mixed mist ejected from the other two-fluid nozzle 60 come into contact with each other and overlap each other at the place where the gas-liquid mixed mist overlaps. This is because the spray striking force of the gas-liquid mixed mist is canceled out and it is difficult to obtain the cleaning effect of the filter cloth belt 10 (20) at that location. The distance d between the two-fluid nozzles 60 arranged in the front and rear is appropriately 2 mm to 3 cm, although it depends on the shape of the two-fluid nozzle 60. This is because when the distance d is too small, the gas-liquid mixed mists ejected from the two-fluid nozzle 60 come in contact with each other, canceling out the spray hitting force, and cannot exert the cleaning effect. When the distance d is large, the cleaning effect is exhibited. This is because the cleaning apparatus becomes excessive.

なお二流体ノズル60の取り付け個数は、図4に示す個数に限定されず、要は、二流体ノズル60から噴射される気液混合ミストにより、濾布ベルト10,20全体を良好に洗浄できる個数であれば、その個数に制約は無い。但し、二流体ノズル60の取り付け個数が多くなると、濾布ベルト10,20の洗浄水量削減時に二流体ノズル1個当たりの洗浄水量が少なくなるため、気液混合ミストの噴霧打力が弱くなり、濾布ベルト10,20の洗浄が不十分となる恐れがある。そのため濾布ベルト洗浄水量削減の観点から、二流体ノズル60の取り付け個数を極端に多くすることは好ましくない。二流体ノズル60の取り付け個数としては、二流体ノズル60の構造、取り付け位置、噴霧距離にもよるが、濾布幅1m当り15個以下、さらに好ましくは濾布幅1m当たり10個以下とすることが望ましい。   The number of attached two-fluid nozzles 60 is not limited to the number shown in FIG. 4. In short, the number by which the entire filter cloth belts 10 and 20 can be satisfactorily washed by the gas-liquid mixing mist ejected from the two-fluid nozzle 60. If so, the number is not limited. However, if the number of attached two-fluid nozzles 60 is increased, the amount of washing water per two-fluid nozzle is reduced when the amount of washing water of the filter cloth belts 10 and 20 is reduced, so that the spray striking force of the gas-liquid mixed mist is weakened. There is a possibility that the cleaning of the filter cloth belts 10 and 20 becomes insufficient. For this reason, it is not preferable to extremely increase the number of attached two-fluid nozzles 60 from the viewpoint of reducing the amount of filter cloth belt washing water. The number of the two-fluid nozzles 60 to be attached depends on the structure of the two-fluid nozzle 60, the attachment position, and the spraying distance, but is 15 or less per 1 m of filter cloth width, more preferably 10 or less per 1 m of filter cloth width. Is desirable.

さらに二流体ノズル60の設置個数は少数個とし、これを濾布ベルト10,20の幅方向に往復移動させるように構成しても良い。即ち、上記例では二流体ノズル60を取り付けた洗浄装置60A(60B)を固定した状態で使用する場合について記述しているが、二流体ノズル60を取り付けた洗浄装置に駆動機構を備え、洗浄装置が濾布ベルト10,20の幅方向全長に渡って往復移動することで濾布ベルト10,20を洗浄するように構成しても良い。この場合、洗浄装置が濾布ベルト10,20の幅方向全長に渡って往復移動するため、洗浄装置に取り付ける二流体ノズル60の数は洗浄装置を固定した場合よりも少なくて済む。ただし、洗浄装置が濾布ベルト10,20の幅方向全長に渡って往復移動して濾布ベルト10,20を洗浄する場合は、洗浄装置を固定して濾布ベルト10,20を洗浄する場合に比べて、濾布ベルト10,20の洗浄斑を生じ易く、洗浄効果の面から洗浄装置を固定して濾布ベルト10,20を洗浄する方式がより好ましい。以下、特に断りの無い場合は、洗浄装置を固定して濾布ベルト10,20の洗浄を行う方式に関するものである。   Further, the number of the two-fluid nozzles 60 may be set to a small number, and the two-fluid nozzles 60 may be configured to reciprocate in the width direction of the filter cloth belts 10 and 20. That is, in the above example, the case where the cleaning device 60A (60B) to which the two-fluid nozzle 60 is attached is used in a fixed state is described. However, the cleaning device to which the two-fluid nozzle 60 is attached is provided with a drive mechanism, However, the filter cloth belts 10 and 20 may be cleaned by reciprocating over the entire length in the width direction of the filter cloth belts 10 and 20. In this case, since the cleaning device reciprocates over the entire length in the width direction of the filter cloth belts 10 and 20, the number of two-fluid nozzles 60 attached to the cleaning device is smaller than when the cleaning device is fixed. However, when the cleaning device is reciprocated over the entire width of the filter cloth belts 10 and 20 to clean the filter cloth belts 10 and 20, the cleaning device is fixed and the filter cloth belts 10 and 20 are cleaned. Compared to the above, a cleaning spot of the filter cloth belts 10 and 20 is likely to be generated, and a method of cleaning the filter cloth belts 10 and 20 by fixing a cleaning device is more preferable in terms of cleaning effect. Hereinafter, unless otherwise specified, the present invention relates to a method of cleaning the filter cloth belts 10 and 20 while fixing the cleaning device.

また洗浄装置60A(60B)の二流体ノズル60の先端から濾布ベルト10,20までの高さ方向の距離(噴霧距離)は3〜15cm、より好ましくは5〜10cmとする。これは、高さ方向の距離が短い場合には気液混合ミストの噴射距離が短くなり、二流体ノズル60の取り付け個数が多くなるためであり、また、高さ方向の距離が長い場合には気液混合ミストの噴霧打力が弱まり、濾布ベルト10,20の洗浄に適さないためである。   The distance in the height direction (spraying distance) from the tip of the two-fluid nozzle 60 of the cleaning device 60A (60B) to the filter cloth belts 10 and 20 is 3 to 15 cm, more preferably 5 to 10 cm. This is because when the distance in the height direction is short, the injection distance of the gas-liquid mixed mist becomes short and the number of the two-fluid nozzles 60 attached increases, and when the distance in the height direction is long. This is because the spray hitting force of the gas-liquid mixed mist is weakened and is not suitable for cleaning the filter cloth belts 10 and 20.

また気液混合ミストの有する強い貫通力により、濾布ベルト10,20表面あるいは織目に食い込んだ汚泥粒子を洗い去ることで、濾布ベルト10,20の洗浄を行うためには、二流体ノズル60から噴射される気液混合ミストは濾布ベルト面に対して直角に噴射することが好ましい。   In order to wash the filter cloth belts 10 and 20 by washing away the sludge particles that have digged into the surface or the texture of the filter cloth belts 10 and 20 by the strong penetration force of the gas-liquid mixing mist, a two-fluid nozzle The gas-liquid mixed mist ejected from 60 is preferably ejected at right angles to the filter cloth belt surface.

本願発明では、濾布ベルト10,20の表・裏関係なく洗浄することができるが、対象汚泥や濾布ベルトの材質や構造により、適正な濾布ベルト10,20の洗浄面を選択することが好ましい。   In the present invention, the filter cloth belts 10 and 20 can be cleaned regardless of whether they are front or back, but an appropriate cleaning surface of the filter cloth belts 10 and 20 is selected depending on the material and structure of the target sludge and the filter cloth belt. Is preferred.

図1に戻って、汚泥投入器51には、造粒槽105から汚泥が供給される。造粒槽105には、汚泥供給手段107と薬液供給手段109が接続されている。汚泥供給手段107は、汚泥を貯蔵する汚泥貯槽111と、汚泥貯槽111の汚泥を造粒槽105に移送する汚泥供給ポンプ113とを有している。一方薬液供給手段109は、溶解水と高分子凝集剤を投入する薬品溶解槽115と、薬品溶解槽115の高分子凝集剤を造粒槽105に移送する薬品注入ポンプ117とを有している。高分子凝集剤としては、有機性高分子凝集剤(以下「ポリマ」という)を用い、カチオンポリマを単独で使用したり、単独カチオンとアニオンの両方のポリマを使用したり、カチオン、アニオンの両性ポリマを使用したりする。   Returning to FIG. 1, sludge is supplied from the granulation tank 105 to the sludge feeder 51. Sludge supply means 107 and chemical supply means 109 are connected to the granulation tank 105. The sludge supply means 107 has a sludge storage tank 111 that stores sludge, and a sludge supply pump 113 that transfers the sludge in the sludge storage tank 111 to the granulation tank 105. On the other hand, the chemical solution supply means 109 includes a chemical dissolution tank 115 into which dissolved water and a polymer flocculant are charged, and a chemical injection pump 117 that transfers the polymer flocculant in the chemical dissolution tank 115 to the granulation tank 105. . As the polymer flocculant, an organic polymer flocculant (hereinafter referred to as “polymer”) is used, and a cationic polymer is used alone, or both a single cation and an anion polymer are used. Or use polymer.

さらにこのベルトプレス型脱水装置1には、このベルトプレス型脱水装置1から排出された排水を一時溜める排水槽119及び排水槽119の排水を外部に移送する排水ポンプ121と、ベルトプレス型脱水装置1から排出された脱水ケーキを外部に搬出する脱水ケーキコンベヤ123が付設されている。   Further, the belt press type dehydrator 1 includes a drainage tank 119 for temporarily storing drainage discharged from the belt press type dehydrator 1, a drain pump 121 for transferring the drainage of the drain tank 119 to the outside, and a belt press type dehydrator. A dehydrated cake conveyor 123 for carrying out the dehydrated cake discharged from 1 to the outside is attached.

以上のように構成されたベルトプレス型脱水装置1において、汚泥貯槽111内の汚泥を汚泥供給ポンプ113によって造粒槽105に供給し、同時に薬品溶解槽115内の高分子凝集剤を薬品注入ポンプ117によって造粒槽105に供給し、造粒槽105において汚泥と微量の高分子凝集剤とを混合攪拌し、水切りが容易で緻密なペレット(粒状物)とする(造粒工程)。次に造粒された汚泥は、汚泥投入器51から濾布ベルト20上に均一に分散・供給され、傾斜する濾布ベルト20上を上昇しながら遊離水を分離(水切り)し、半固形状にする(重力脱水工程)。   In the belt press type dehydrator 1 configured as described above, the sludge in the sludge storage tank 111 is supplied to the granulation tank 105 by the sludge supply pump 113, and at the same time, the polymer flocculant in the chemical dissolution tank 115 is supplied to the chemical injection pump. 117 is supplied to the granulation tank 105, and the sludge and a small amount of the polymer flocculant are mixed and stirred in the granulation tank 105 to form a fine pellet (granular material) that is easily drained (granulation step). Next, the granulated sludge is uniformly dispersed and supplied from the sludge feeder 51 onto the filter cloth belt 20, and the free water is separated (drained) while ascending on the inclined filter cloth belt 20, thereby being semi-solid. (Gravity dehydration process).

重力脱水(重力濃縮)を終えた汚泥は2枚の濾布ベルト10,20に挟み込まれて、複数段(4段)の圧搾ロール31〜37を通過するときに、これら圧搾ロール31〜37により機械的に圧搾され、脱水が進行する(圧搾脱水工程)。次に低含水率の脱水ケーキとなって濾布ベルト10,20に付着している汚泥は、それぞれスクレーパ53,55によって除去される。除去された脱水ケーキは、脱水ケーキコンベヤ123によって搬出される。   The sludge that has been subjected to gravity dehydration (gravity concentration) is sandwiched between the two filter cloth belts 10 and 20, and passes through a plurality of (four-stage) pressing rolls 31 to 37, by these pressing rolls 31 to 37. It is squeezed mechanically and dehydration proceeds (press dehydration step). Next, the sludge adhering to the filter cloth belts 10 and 20 as a dehydrated cake having a low water content is removed by the scrapers 53 and 55, respectively. The removed dehydrated cake is carried out by the dehydrated cake conveyor 123.

一方、脱水ケーキが除去された濾布ベルト10,20の表面(この例の場合は脱水ケーキが付着していた側の面)は、洗浄装置60A,60Bの二流体ノズル60により、それぞれ洗浄される。   On the other hand, the surfaces of the filter cloth belts 10 and 20 from which the dewatered cake has been removed (in this example, the surface on which the dewatered cake has adhered) are cleaned by the two-fluid nozzle 60 of the cleaning devices 60A and 60B, respectively. The

即ち、図2において、コンプレッサ95から供給された圧縮気体(以下「圧縮空気」という)は、調圧器93と空気流量計91によって圧力及び流量が調整された後、ノズル本体61の主流路67に供給される。一方洗浄水タンク103から洗浄水ポンプ101により送水された洗浄水は、この洗浄水ポンプ101と流量計99によって流量が調整された後、液体供給部材65の液体流路77内に供給される。   That is, in FIG. 2, the compressed gas supplied from the compressor 95 (hereinafter referred to as “compressed air”) is adjusted in pressure and flow rate by the pressure regulator 93 and the air flow meter 91, and then is supplied to the main channel 67 of the nozzle body 61. Supplied. On the other hand, the wash water sent from the wash water tank 103 by the wash water pump 101 is supplied into the liquid flow path 77 of the liquid supply member 65 after the flow rate is adjusted by the wash water pump 101 and the flow meter 99.

液体流路77内に導入された洗浄水は、気液混合部73内に吐出され、気液混合部73内を流れる空気に側面衝突で混合される。気液混合部73で混合された気水混合流体は、混合室75を通ってノズル63の孔83に流入するが、その際、段差面87と衝突して、粒子の微粒化が図られる。孔83に流入した気水混合流体は、スリット状の噴射孔85より噴射される。噴射された気水混合ミストは、噴射孔85の形状に応じて、広角扇形で且つ噴霧厚さが薄いスプレーパターンとなり、且つスプレーパターン全域にわたって粒径が均等で、且つ空気量及び液量共に略均等となる。スリット状の噴射孔85の長さ方向の噴射角度は50°以下にすると広がり方向の噴射距離が短くなりすぎ、また80°以上にすると噴霧打力が弱まるため、60°〜80°(即ち広がり角度α=60°〜80°)とすることで噴霧打力の強い噴霧距離の適切な気液混合ミストを噴射することが可能となり、ベルトプレス型脱水装置1の濾布ベルト10,20の洗浄に用いて好適になる。   The washing water introduced into the liquid channel 77 is discharged into the gas-liquid mixing unit 73 and mixed with the air flowing through the gas-liquid mixing unit 73 by side collision. The gas-water mixed fluid mixed in the gas-liquid mixing unit 73 flows into the hole 83 of the nozzle 63 through the mixing chamber 75, and collides with the stepped surface 87 at that time, thereby achieving particle atomization. The air / water mixed fluid flowing into the hole 83 is ejected from the slit-shaped ejection hole 85. The sprayed air / water mixture mist has a spray pattern with a wide-angle fan shape and a thin spray thickness according to the shape of the spray hole 85, a uniform particle diameter over the entire spray pattern, and substantially both the air amount and the liquid amount. It will be equal. If the injection angle in the longitudinal direction of the slit-like injection hole 85 is 50 ° or less, the injection distance in the spreading direction becomes too short, and if it is 80 ° or more, the spray hitting force is weakened. By setting the angle α = 60 ° to 80 °), it becomes possible to inject an appropriate gas-liquid mixed mist having a spraying force with a strong spray hitting force, and cleaning the filter cloth belts 10 and 20 of the belt press type dehydrator 1. It becomes suitable for use.

このように二流体ノズル60によって、水と空気とを混合した気液混合ミストを濾布ベルト10,20に噴射すれば、水単独の場合に比べ噴霧打力が高まる。このため洗浄水単独の場合に比べて少ない洗浄水量であっても、濾布ベルト10,20表面あるいは織目に食い込んだ微粒子を気液混合ミストの有する強い貫通力により、織目を通して洗い去ることで、効果的に濾布ベルト10,20の洗浄が行える。しかも上述のように、隣り合う二流体ノズル60は互い違いに配置されているので、他の二流体ノズル60からの気液混合ミストと重なって噴霧打力が打ち消し合うことがなく、各二流体ノズル60の気液混合ミストそれぞれの洗浄効果を無駄なく発揮できる。この洗浄による洗浄排水と、汚泥からの脱水濾液は、排水槽119に集められ、排水ポンプ121によって外部に排出される。   In this way, if the gas-liquid mixed mist obtained by mixing water and air is sprayed onto the filter cloth belts 10 and 20 by the two-fluid nozzle 60, the spray hitting force is increased as compared with the case of water alone. For this reason, even if the amount of washing water is small as compared with the case of washing water alone, fine particles that have penetrated the surface of the filter cloth belts 10 and 20 or the weave are washed away through the texture by the strong penetration force of the gas-liquid mixed mist. Thus, the filter cloth belts 10 and 20 can be effectively cleaned. In addition, as described above, the adjacent two-fluid nozzles 60 are alternately arranged, so that the two-fluid nozzles do not overlap with the gas-liquid mixing mist from the other two-fluid nozzles 60 and cancel each other out. The cleaning effect of each of the 60 gas-liquid mixed mists can be exhibited without waste. The washing waste water by this washing and the dehydrated filtrate from the sludge are collected in the drain tank 119 and discharged to the outside by the drain pump 121.

洗浄が終了した濾布ベルト10,20は、再び汚泥投入器51側に戻り、上記動作を繰り返す。   The filter cloth belts 10 and 20 that have been cleaned return to the sludge feeder 51 side again and repeat the above operation.

ここで二流体ノズル60に供給される圧縮空気の最適圧力について説明する。二流体ノズル60に供給される圧縮空気の圧力は0.15MPa以上とすることで、濾布ベルト洗浄の洗浄水量削減効果が得られることが、以下の実験で確認できた。さらに圧縮空気の圧力を0.2MPaとした場合、圧力0.15MPaの場合に比べて圧縮空気の圧力が高まることで気液混合ミストの噴霧打力の強さが増し、洗浄水量削減効果が高まることも、以下の実験で確認できた。圧縮空気の圧力が0.2MPa以上では、圧縮空気の圧力を高めることにより、気液混合ミストの噴霧打力の強さが増す傾向にはあり、濾布ベルト60の洗浄効果は高まるが、濾布ベルト洗浄の洗浄水量削減効果はそれほど大きくならないことも確認できた。そのため、コンプレッサ95を必要以上に過大としないためにも、二流体ノズル60に供給する圧縮空気の圧力は実用的な範囲で0.5MPa以下とすることが好ましい。従って、二流体ノズル60に供給する圧縮空気の圧力としては、0.15〜0.5MPaが好適であり、より好ましくは、0.2〜0.5MPaが好適である。   Here, the optimum pressure of the compressed air supplied to the two-fluid nozzle 60 will be described. It has been confirmed in the following experiment that the pressure of the compressed air supplied to the two-fluid nozzle 60 is 0.15 MPa or more, so that the effect of reducing the amount of washing water by the filter cloth belt washing can be obtained. Further, when the pressure of the compressed air is 0.2 MPa, the pressure of the compressed air is increased as compared with the case of the pressure of 0.15 MPa, thereby increasing the strength of the spray striking force of the gas-liquid mixed mist and increasing the washing water amount reducing effect. This was also confirmed by the following experiment. When the pressure of the compressed air is 0.2 MPa or more, increasing the pressure of the compressed air tends to increase the strength of the spraying force of the gas-liquid mixed mist and the cleaning effect of the filter cloth belt 60 is increased. It was also confirmed that the cleaning water amount reduction effect of the cloth belt cleaning does not increase so much. Therefore, in order not to make the compressor 95 excessively large as necessary, the pressure of the compressed air supplied to the two-fluid nozzle 60 is preferably 0.5 MPa or less in a practical range. Accordingly, the pressure of the compressed air supplied to the two-fluid nozzle 60 is preferably 0.15 to 0.5 MPa, and more preferably 0.2 to 0.5 MPa.

次に二流体ノズル60に供給される洗浄水量について説明する。上述のように、濾布ベルト10,20の洗浄に気体と液体とを混合した気液混合ミストを噴射する二流体ノズル60を使用することで洗浄水量が削減できることが、以下の実験で確認できた。具体的には、ベルトプレス型脱水装置1の濾布ベルト洗浄を洗浄水単独で行った場合に好適な洗浄効果が得られた洗浄水量は、濾布ベルト幅1m当り6m/hであったのに対して、上記二流体ノズル60を使用した場合に同様の洗浄効果が得られた最小の洗浄水量は、濾布ベルト幅1m当り1.5m/hであった。つまり洗浄水量を4分に1まで削減可能であった。ここで洗浄水量は、濾布ベルト10,20の両方を洗浄する場合の全洗浄水量を意味する(以下同様)。 Next, the amount of cleaning water supplied to the two-fluid nozzle 60 will be described. As described above, it can be confirmed in the following experiment that the amount of cleaning water can be reduced by using the two-fluid nozzle 60 that injects a gas-liquid mixed mist obtained by mixing gas and liquid for cleaning the filter cloth belts 10 and 20. It was. Specifically, when the filter cloth belt of the belt press type dehydrator 1 was washed with washing water alone, the amount of washing water with which a suitable washing effect was obtained was 6 m 3 / h per 1 m of filter cloth belt width. On the other hand, when the two-fluid nozzle 60 was used, the minimum amount of washing water with which the same washing effect was obtained was 1.5 m 3 / h per 1 m of the filter cloth belt width. In other words, the amount of washing water could be reduced to 1 in 4 minutes. Here, the amount of washing water means the total amount of washing water when both the filter cloth belts 10 and 20 are washed (the same applies hereinafter).

洗浄水量をさらに極端に少なくすると、気液混合ミストの噴霧打力が弱まり、濾布ベルト10,20の洗浄が不十分となるため、濾布ベルト10,20が目詰まりし易い傾向にあり、汚泥微粒子が残留した濾布ベルト10,20で脱水操作を繰り返すことで含水率低下を招く。特にし尿処理場や下水処理場などで発生する有機分を多く含んだ汚泥をベルトプレス型脱水装置1で脱水する場合には、脱水後の汚泥を剥離した後の濾布ベルト10,20表面や織目に食い込んだ汚泥の微粒子の付着は強固であるため、この傾向が顕著である。そのため、二流体ノズル60を使用した場合でも、洗浄水量は水単独の場合の4分の1以上、具体的には上述のように、濾布ベルト幅1m当り1.5m/h以上が必要であった。 If the amount of washing water is further extremely reduced, the spray striking force of the gas-liquid mixed mist is weakened and the washing of the filter cloth belts 10 and 20 becomes insufficient, so that the filter cloth belts 10 and 20 tend to be clogged. By repeating the dehydration operation on the filter cloth belts 10 and 20 in which the sludge fine particles remain, the water content is lowered. In particular, when dewatering sludge containing a large amount of organic matter generated at a human waste treatment plant or a sewage treatment plant using the belt press type dehydrator 1, the surface of the filter cloth belts 10 and 20 after the dewatered sludge is peeled off, This tendency is conspicuous because the adhesion of fine particles of the sludge that dig into the texture is strong. Therefore, even when the two-fluid nozzle 60 is used, the amount of water to be washed is at least a quarter of that of water alone. Specifically, as described above, 1.5 m 3 / h or more per 1 m of filter cloth belt width is required. Met.

以下、本発明を実施例により具体的に説明するが、本発明はこの実施例によって限定されるものではない。
実施例として、図1に示すベルトプレス型脱水装置1にて、し尿処理場の余剰汚泥の濃縮汚泥(以下「供給汚泥」という)を対象に、ベルトプレス型脱水装置1で汚泥の脱水処理を行った。ベルトプレス型脱水装置1の有効濾布ベルト幅は0.5mとした。汚泥貯槽111から供給される供給汚泥の汚泥濃度は2%とし、カチオンポリマで凝集後、ベルトプレス型脱水装置1に供給した。汚泥貯槽111から造粒槽105に移送される汚泥供給量は2.5m/hとした。濾布ベルト10,20の送り速度(以下、「濾布速度」とも記す)を1m/minとした。
EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by this Example.
As an example, in the belt press type dewatering apparatus 1 shown in FIG. 1, the sludge dewatering process is performed by the belt press type dehydrating apparatus 1 for concentrated sludge (hereinafter referred to as “supply sludge”) of excess sludge in the human waste treatment plant. went. The effective filter cloth belt width of the belt press type dehydrator 1 was 0.5 m. The sludge concentration of the supplied sludge supplied from the sludge storage tank 111 was 2%, aggregated with a cationic polymer, and then supplied to the belt press type dehydrator 1. The sludge supply amount transferred from the sludge storage tank 111 to the granulation tank 105 was 2.5 m 3 / h. The feed speed of the filter cloth belts 10 and 20 (hereinafter also referred to as “filter cloth speed”) was set to 1 m / min.

そして脱水が完了し、スクレーパ53,55により脱水ケーキを剥離した後、洗浄装置60A,60Bで上下2枚の濾布ベルト10,20の洗浄を行った。各洗浄装置60A,60Bは前記図2に示す構造の二流体ノズル60を6個ずつ備え、図4,図5に示すように隣り合う二流体ノズル60を濾布ベルトの進行方向に対して前後に配置した構造である。前後に配置した二流体ノズル60間の距離dは1cmとしている。そして圧縮空気と洗浄水を各二流体ノズル60に供給し、濾布ベルト10,20の洗浄を両者均等の洗浄水量にて行った。洗浄面は図1に示す通り、脱水ケーキの剥離面とした。洗浄水としては工水を使用した。   After the dehydration was completed and the dehydrated cake was peeled off by the scrapers 53 and 55, the upper and lower filter cloth belts 10 and 20 were washed by the washing devices 60A and 60B. Each of the cleaning devices 60A and 60B includes six two-fluid nozzles 60 having the structure shown in FIG. 2, and as shown in FIGS. 4 and 5, the adjacent two-fluid nozzles 60 are moved back and forth with respect to the traveling direction of the filter cloth belt. It is the structure arranged in. The distance d between the two fluid nozzles 60 arranged at the front and rear is 1 cm. Compressed air and washing water were supplied to each two-fluid nozzle 60, and the filter cloth belts 10 and 20 were washed with an equal amount of washing water. As shown in FIG. 1, the cleaned surface was a dewatered cake peeling surface. Industrial water was used as the washing water.

表1は、二流体ノズル60に供給する空気量、空気圧力、洗浄水量を変更して洗浄を継続して行い、結果として脱水ケーキに含まれる含水率を測定した結果を示す表である。

Figure 0006276146
Table 1 is a table showing the result of measuring the moisture content contained in the dewatered cake as a result of continuously washing by changing the amount of air supplied to the two-fluid nozzle 60, the air pressure, and the amount of washing water.
Figure 0006276146

ここで含水率とは、濾布ベルト10,20の洗浄と汚泥の脱水を繰り返して行って、定常的になった脱水ケーキ中の含水率をいう。例えば、この例の場合、脱水前の供給汚泥の汚泥濃度は2%なので、含水率は98%である。これを含水率80%の脱水ケーキにすると、体積では1/10の量になるので、十分な脱水が行えたと言える。一方表1の含水率(%)の欄で、「×」と記載したのは、濾布ベルト10,20の洗浄と汚泥の脱水を繰り返して行った際、次第に脱水ケーキの含水率が悪化(上昇)し、最終的には圧搾脱水工程で汚泥が濾布ベルト10,20から漏れ出る状態となり、脱水処理の継続が困難になったことを示している。   Here, the moisture content refers to the moisture content in the dewatered cake that has become steady by repeatedly washing the filter cloth belts 10 and 20 and dewatering the sludge. For example, in this example, since the sludge concentration of the supplied sludge before dehydration is 2%, the moisture content is 98%. When this was made into a dehydrated cake with a moisture content of 80%, the volume was reduced to 1/10, so it can be said that sufficient dehydration was possible. On the other hand, in the column of moisture content (%) in Table 1, “x” is described as the moisture content of the dewatered cake gradually deteriorated when the filter cloth belts 10 and 20 were repeatedly washed and sludge dehydrated ( Finally, the sludge is leaked from the filter cloth belts 10 and 20 in the squeezing and dewatering process, which indicates that it is difficult to continue the dewatering process.

洗浄方法としては、水洗浄のみ(従来法1,比較例3)、空気洗浄のみ(比較例1)、空気洗浄後に水洗浄(比較例2)、空気―水併用洗浄(実験例1〜9)を行った。比較例2の場合のみ、空気洗浄用の二流体ノズル60(6個ずつ)の後段に、水洗浄用の二流体ノズル(6個ずつ)を備えた洗浄装置とした。比較例2以外は、前記二流体ノズル60に水のみ、空気のみ、水と空気の両者を供給することで洗浄を行った。従来法1は、洗浄水のみで濾布ベルト10,20の洗浄を行う従来法(以下、「水洗浄」とも記す)である。各条件の切り替え時には、この従来法による濾布ベルト10,20の洗浄を十分に行った。   Cleaning methods include water cleaning only (conventional method 1, comparative example 3), air cleaning only (comparative example 1), water cleaning after air cleaning (comparative example 2), and air-water combined cleaning (experimental examples 1 to 9). Went. Only in the case of Comparative Example 2, the cleaning device was provided with the two-fluid nozzles (6 units) for water cleaning at the subsequent stage of the two-fluid nozzles 60 (6 units) for air cleaning. Except for Comparative Example 2, cleaning was performed by supplying the two-fluid nozzle 60 with only water, only air, and both water and air. The conventional method 1 is a conventional method (hereinafter, also referred to as “water cleaning”) in which the filter cloth belts 10 and 20 are cleaned only with cleaning water. When switching the conditions, the filter cloth belts 10 and 20 were sufficiently washed by this conventional method.

(従来法1)
上述のように、従来法1は、従来から行われている、洗浄水のみで濾布ベルト10,20の洗浄を行う方法である。即ちこの従来法1では、洗浄水量を3m/hとすることで、良好な濾布ベルト10,20の洗浄が行えた。このときの脱水ケーキの含水率は80〜82%で好適であった。
(Conventional method 1)
As described above, the conventional method 1 is a conventional method of cleaning the filter cloth belts 10 and 20 only with cleaning water. That is, in the conventional method 1, the filter cloth belts 10 and 20 can be cleaned satisfactorily by setting the amount of cleaning water to 3 m 3 / h. The moisture content of the dehydrated cake at this time was suitable at 80 to 82%.

(比較例1)
空気洗浄のみの比較例1では、濾布ベルト10,20の洗浄後も濾布ベルト10,20の織目内部や濾布ベルト洗浄面の反対側に汚泥粒子が残留していることが目視により確認できた。最初の濾布ベルト洗浄後の脱水では脱水ケーキの含水率が84%と悪化していた。さらに濾布ベルト10,20の洗浄と脱水を繰り返すと、次第に含水率が悪化し、最終的には圧搾脱水工程で汚泥が濾布ベルト10,20から漏れ出る状態となった。即ち圧縮空気のみによる洗浄では、汚泥微粒子を濾布ベルト10,20から十分に洗い去ることは難しく、濾布ベルト10,20が目詰まりし易くなった。そのため、汚泥微粒子が残留した濾布ベルト10,20で脱水操作を繰り返すことで、含水率悪化等の脱水性能の低下を招き、安定した脱水処理の継続が困難となった。
(Comparative Example 1)
In Comparative Example 1 in which only air cleaning is performed, it is visually observed that sludge particles remain inside the texture of the filter cloth belts 10 and 20 and on the opposite side of the filter cloth belt cleaning surface even after the filter cloth belts 10 and 20 are cleaned. It could be confirmed. In the dehydration after the first filter cloth belt washing, the moisture content of the dehydrated cake was deteriorated to 84%. Further, when washing and dewatering of the filter cloth belts 10 and 20 were repeated, the moisture content gradually deteriorated, and finally, sludge leaked from the filter cloth belts 10 and 20 in the pressing and dewatering process. That is, with cleaning only with compressed air, it is difficult to sufficiently remove sludge fine particles from the filter cloth belts 10 and 20, and the filter cloth belts 10 and 20 are easily clogged. Therefore, repeating the dehydration operation on the filter cloth belts 10 and 20 in which the sludge fine particles remain causes a decrease in the dehydration performance such as a deterioration of the water content, making it difficult to continue the stable dehydration process.

(比較例2)
空気洗浄後に水洗浄を行う比較例2では、空気洗浄のみの比較例1よりも濾布ベルト洗浄効果が高まるが、洗浄水量を従来法1の半分としたため、濾布ベルト10,20の織目内部や濾布ベルト洗浄面の反対側に残留している汚泥粒子を十分に洗い流すことが困難であった。そのため、濾布ベルト10,20の洗浄と脱水を繰り返すと、次第に含水率が悪化し、最終的には圧搾脱水工程で汚泥が濾布ベルト10,20から漏れ出る状態となった。
(Comparative Example 2)
In Comparative Example 2 in which water cleaning is performed after air cleaning, the filter cloth belt cleaning effect is higher than in Comparative Example 1 in which only air cleaning is performed. However, since the amount of cleaning water is half that of the conventional method 1, the texture of the filter cloth belts 10 and 20 is increased. It was difficult to sufficiently wash away the sludge particles remaining inside and on the opposite side of the cleaning surface of the filter cloth belt. Therefore, when washing and dewatering of the filter cloth belts 10 and 20 were repeated, the water content gradually deteriorated, and finally, sludge leaked from the filter cloth belts 10 and 20 in the pressing and dewatering process.

(比較例3)
洗浄水量を従来法1の半分とした洗浄水のみで濾布ベルト10,20の洗浄を行う比較例3の場合も、比較例2と略同様であった。
(Comparative Example 3)
The case of Comparative Example 3 in which the filter cloth belts 10 and 20 were washed only with the washing water in which the amount of washing water was half that of the conventional method 1 was substantially the same as that of Comparative Example 2.

比較例1〜3の洗浄効果を比べると、比較例2>比較例3>>比較例1であるが、何れも最終的には圧搾脱水工程で汚泥が濾布ベルト10,20から漏れ出る状態となり、濾布ベルト洗浄効果としては不十分であった。   Comparing the cleaning effects of Comparative Examples 1 to 3, Comparative Example 2> Comparative Example 3 >> Comparative Example 1, but in the final state, sludge leaks out from the filter cloth belts 10 and 20 in the press dehydration process. Thus, the filter cloth belt cleaning effect was insufficient.

(実験例1)
空気−水併用洗浄とした実験例1では、濾布ベルト10,20の織目内部や濾布ベルト10,20に付着していた汚泥粒子を十分に洗い去ることが可能であり、目視による観察では、従来法1と同程度の洗浄効果が確認できた。実験例1では洗浄が良好であるため、安定した脱水処理の継続が可能であり、脱水ケーキの含水率は従来法と同じ80〜82%であった。
(Experimental example 1)
In Experimental Example 1 in which air-water combined cleaning was performed, the sludge particles adhering to the inside of the weaves of the filter cloth belts 10 and 20 and the filter cloth belts 10 and 20 can be sufficiently washed away and visually observed. Then, the cleaning effect comparable to the conventional method 1 was confirmed. In Experimental Example 1, since the washing was good, it was possible to continue the stable dehydration treatment, and the moisture content of the dehydrated cake was 80 to 82% as in the conventional method.

以上のことからわかるように、濾布ベルト10,20の洗浄に気体と液体を混合して噴霧打力を高めた気液混合ミストを噴射する二流体ノズルを使用した実験例1では、濾布ベルト10,20の洗浄が良好であり、安定した脱水処理の継続が可能であった。つまり実験例1では、洗浄水単独の従来法1に比べて少ない洗浄水量であっても、気液混合ミストの有する強い貫通力により、濾布ベルト表面あるいは織目に食い込んだ汚泥粒子を洗い去ることで、濾布ベルト10,20の洗浄を行うことができるため、濾布ベルト洗浄水量を削減することが可能となる。   As can be seen from the above, in the experimental example 1 using the two-fluid nozzle for injecting the gas-liquid mixing mist in which the gas and the liquid are mixed and the spray hitting force is increased for cleaning the filter cloth belts 10 and 20, the filter cloth is used. The belts 10 and 20 were washed well and stable dehydration processing could be continued. That is, in Experimental Example 1, even if the amount of washing water is small compared to the conventional method 1 of washing water alone, the sludge particles that have digged into the filter cloth belt surface or the texture are washed away by the strong penetration force of the gas-liquid mixed mist. Thus, since the filter cloth belts 10 and 20 can be cleaned, the amount of filter cloth belt cleaning water can be reduced.

(実験例1〜4)
実験例1〜4では、空気−水併用洗浄での洗浄水量の比較を行った。即ち、空気圧0.5MPa、空気量300NL/minに設定し、洗浄水量を0.5〜1.5m/hの範囲で変更して比較した。
(Experimental Examples 1-4)
In Experimental Examples 1-4, the amount of washing water in air-water combined washing was compared. That is, the air pressure was set to 0.5 MPa, the air amount was set to 300 NL / min, and the amount of washing water was changed in the range of 0.5 to 1.5 m 3 / h for comparison.

洗浄水量を0.75〜1.5m/hとした実験例1〜3では、濾布ベルト10,20の織目内部や濾布ベルト10,20に付着していた汚泥粒子を十分に洗い去ることが可能であり、目視による観察では、従来法1と同程度の洗浄効果が確認できた。実験例1〜3では洗浄が良好であるため、安定した脱水処理の継続が可能であり、脱水ケーキの含水率は従来法と同じ80〜82%であった。 In Experimental Examples 1 to 3 in which the amount of washing water was 0.75 to 1.5 m 3 / h, the sludge particles adhering to the inside of the filter cloth belts 10 and 20 and the filter cloth belts 10 and 20 were sufficiently washed. It was possible to leave, and visual observations confirmed a cleaning effect comparable to that of the conventional method 1. In Experimental Examples 1 to 3, since the washing was good, stable dehydration treatment could be continued, and the moisture content of the dehydrated cake was 80 to 82%, the same as in the conventional method.

一方、洗浄水量を0.5m/hに低減した実験例4では、濾布ベルト10,20の織目内部や濾布ベルト洗浄面の反対側に残留している汚泥粒子を十分に洗い流すことが困難であり、濾布ベルト10,20の洗浄と脱水を繰り返すと次第に含水率が悪化し、最終的には圧搾脱水工程で汚泥が濾布ベルト10,20から漏れ出る状態となった。 On the other hand, in Experimental Example 4 in which the amount of washing water was reduced to 0.5 m 3 / h, the sludge particles remaining on the inside of the weaves of the filter cloth belts 10 and 20 and on the opposite side of the washing surface of the filter cloth belts were sufficiently washed away. However, when washing and dewatering of the filter cloth belts 10 and 20 were repeated, the water content gradually deteriorated, and finally, sludge leaked from the filter cloth belts 10 and 20 in the pressure dehydration process.

以上のことからわかるように、濾布ベルト10,20の洗浄に、気体と液体とを混合した気液混合ミストを噴射する二流体ノズル60を使用することで、洗浄水量を削減することが可能となるが、実験例4のように、洗浄水量を少なくしすぎると、気液混合ミストの噴霧打力が弱まり、濾布ベルト10,20の洗浄が不十分となるため、濾布ベルト10,20が目詰まりし易くなり、安定した脱水処理の継続が困難となった。そのため、二流体ノズル使用時の洗浄水量は、実験例3の0.75m/hまで削減可能であることが確認できた。実験例3の洗浄水量は、濾布幅1m当り1.5m/hに相当する。 As can be seen from the above, it is possible to reduce the amount of cleaning water by using the two-fluid nozzle 60 that injects a gas-liquid mixed mist in which gas and liquid are mixed for cleaning the filter cloth belts 10 and 20. However, as in Experimental Example 4, if the amount of washing water is too small, the spray hitting force of the gas-liquid mixed mist is weakened and the washing of the filter cloth belts 10 and 20 becomes insufficient. No. 20 was easily clogged, making it difficult to continue stable dehydration. Therefore, it was confirmed that the amount of washing water when using the two-fluid nozzle can be reduced to 0.75 m 3 / h in Experimental Example 3. The amount of washing water in Experimental Example 3 corresponds to 1.5 m 3 / h per 1 m of filter cloth width.

(実験例3、5〜9)
実験例3、5〜9では、空気−水併用洗浄での空気圧力の比較を行った。
まず実験例3、5〜7では、洗浄水量を0.75m/hに設定し、空気圧力を0.15〜0.5MPaの範囲で変更して比較した。実験例5〜7では空気量は空気圧力に応じた空気量として特に調整を行わなかった。
(Experimental example 3, 5-9)
In Experimental Examples 3 and 5-9, air pressures in air-water combined cleaning were compared.
First, in Experimental Examples 3 and 5-7, the amount of washing water was set to 0.75 m 3 / h, and the air pressure was changed in the range of 0.15 to 0.5 MPa for comparison. In Experimental Examples 5 to 7, the air amount was not particularly adjusted as the air amount according to the air pressure.

洗浄水量を0.75m/h、空気圧力を0.20〜0.5MPaとした実験例3,5,6では、濾布ベルト10,20の織目内部や濾布ベルトに付着していた汚泥粒子を十分に洗い去ることが可能であり、目視による観察では、従来法1と同程度の洗浄効果が確認できた。実験例3,5,6は洗浄が良好であるため、安定した脱水処理の継続が可能であり、脱水ケーキの含水率は従来法1と同じ80〜82%であった。 In Experimental Examples 3, 5, and 6 in which the amount of washing water was 0.75 m 3 / h and the air pressure was 0.20 to 0.5 MPa, the water was adhered to the inside of the filter cloth belts 10 and 20 and the filter cloth belt. The sludge particles can be sufficiently washed away, and visual observations have confirmed a cleaning effect comparable to that of the conventional method 1. Since Experimental Examples 3, 5, and 6 were well washed, it was possible to continue the stable dehydration treatment, and the moisture content of the dehydrated cake was 80 to 82%, the same as in the conventional method 1.

洗浄水量を0.75m/h、空気圧力を0.15MPaとした実験例7では、濾布ベルト10,20の織目内部や濾布ベルト洗浄面の反対側に残留している汚泥粒子を十分に洗い流すことが困難であり、濾布ベルト10,20の洗浄と脱水を繰り返すと次第に含水率が悪化し、最終的には圧搾脱水工程で汚泥が濾布ベルト10,20から漏れ出る状態となった。 In Experimental Example 7 where the amount of washing water was 0.75 m 3 / h and the air pressure was 0.15 MPa, the sludge particles remaining inside the weaves of the filter cloth belts 10 and 20 and on the opposite side of the washing surface of the filter cloth belts were removed. It is difficult to wash away sufficiently, and when the filter cloth belts 10 and 20 are repeatedly washed and dehydrated, the water content gradually deteriorates, and finally the sludge leaks from the filter cloth belts 10 and 20 in the press dehydration process. became.

しかし空気圧力が0.15MPaの場合でも、洗浄水量を1.5m/hに設定し、空気−水併用洗浄を行った実験例9では、目視による観察では、従来法1と同程度の洗浄効果が確認でき、濾布ベルト10,20の洗浄が良好であるため、安定した脱水処理の継続が可能であり、脱水ケーキの含水率は従来法1とほぼ同じである80〜83%であった。 However, even in the case where the air pressure is 0.15 MPa, in Experimental Example 9 in which the amount of cleaning water was set to 1.5 m 3 / h and the combined cleaning of air and water was performed, the same level of cleaning as in the conventional method 1 was observed by visual observation. Since the effect can be confirmed and the filter cloth belts 10 and 20 are washed well, stable dehydration processing can be continued, and the moisture content of the dehydrated cake is 80 to 83%, which is almost the same as in the conventional method 1. It was.

以上の説明から明らかなように、洗浄水量の削減効果としては、空気圧力を0.20〜0.5MPaとした実験例3,5,6で従来法1の4分の1(0.75m/h、即ち濾布ベルト幅1m当り1.5m/h)、空気圧力を0.15MPaに設定した実験例9で従来法1の2分の1(1.5m/h、即ち濾布ベルト幅1m当り3.0m/h)であった。即ち、圧縮空気の圧力を0.2〜0.5MPaとした場合、圧力を0.15MPaとした場合に比べて圧縮空気の圧力を高めることで気液混合ミストの噴霧打力の強さが増すため、洗浄水量削減効果は高まるが、二流体ノズル60に供給する圧縮空気の圧力を0.15MPa以上とすることで、濾布ベルト洗浄の洗浄水量削減効果は得られることが確認できた。 As is clear from the above description, as an effect of reducing the amount of washing water, in experimental examples 3, 5, and 6 in which the air pressure was 0.20 to 0.5 MPa, a quarter of the conventional method 1 (0.75 m 3). / H, that is, 1.5 m 3 / h per 1 m of the filter belt width, and an air pressure of 0.15 MPa in Example 9, which is half that of the conventional method 1 (1.5 m 3 / h, that is, the filter cloth) The belt width was 3.0 m 3 / h per 1 m of the belt width. That is, when the pressure of the compressed air is 0.2 to 0.5 MPa, the strength of the spray striking force of the gas-liquid mixed mist increases by increasing the pressure of the compressed air as compared with the case where the pressure is 0.15 MPa. Therefore, although the washing water amount reduction effect is enhanced, it has been confirmed that the washing water amount reduction effect of the filter cloth belt washing can be obtained by setting the pressure of the compressed air supplied to the two-fluid nozzle 60 to 0.15 MPa or more.

表2は、濾布速度を変更して洗浄を継続して行い、結果として脱水ケーキに含まれる含水率を測定した結果を示す表である。

Figure 0006276146
Table 2 is a table showing the result of measuring the moisture content contained in the dehydrated cake as a result of continuously washing with changing the filter cloth speed.
Figure 0006276146

即ち、濾布速度1m/minで脱水処理を行った前記実験例6の条件において、濾布速度を0.5〜2m/minに設定した条件での脱水処理について検討を行った。実験例10では濾布速度を0.5m/minに、実験例11では濾布速度を2m/minに設定した。実験例10及び11では濾布速度以外の条件は実験例6と同じである。なお実験例6、10、11の濾布速度と同一条件で、洗浄方法を水洗浄とし、洗浄水量を3m/hとした従来法1,2,3での脱水処理を行い、従来法と実験例との脱水性能の比較を行った。 That is, the dehydration treatment was performed under the condition where the filter cloth speed was set to 0.5 to 2 m / min under the condition of Experimental Example 6 in which the dehydration process was performed at a filter cloth speed of 1 m / min. In Experimental Example 10, the filter cloth speed was set to 0.5 m / min, and in Experimental Example 11, the filter cloth speed was set to 2 m / min. In Experimental Examples 10 and 11, the conditions other than the filter cloth speed are the same as in Experimental Example 6. In addition, under the same conditions as the filter cloth speeds of Experimental Examples 6, 10, and 11, the washing method was water washing, and the dehydration treatment was performed by the conventional methods 1, 2, and 3 with a washing water amount of 3 m 3 / h. The dehydration performance was compared with the experimental example.

各条件で汚泥供給量を2.5m/hとしたが、濾布速度の遅い実験例10の条件でも重力濃縮部での汚泥の水切りは良好であり、濾布速度を0.5〜2m/minの条件で汚泥供給量を2.5m/hで一定としても脱水処理に支障は無かった。 Sludge supply rate was 2.5 m 3 / h under each condition, but sludge draining in the gravity concentration section was good even under the conditions of Experimental Example 10 where the filter cloth speed was slow, and the filter cloth speed was 0.5-2 m. Even if the sludge supply rate was kept constant at 2.5 m 3 / h under the conditions of / min, there was no problem in the dehydration treatment.

本発明の空気−水併用洗浄で濾布ベルト10,20の洗浄を行った場合、実験例6,10,11の各条件において、濾布ベルト10,20の織目内部や濾布ベルト10,20に付着していた汚泥粒子を十分に洗い去ることが可能であり、目視による観察では、従来法1,2,3と同程度の洗浄効果が確認できた。実験例6,10,11では洗浄が良好であるため、安定した脱水処理の継続が可能であり、脱水ケーキの含水率は実験例6では80〜82%、実験例10では79〜81%、実験例11では82〜84%であった。濾布速度が同じであり、水洗浄を行った従来法と空気−水併用洗浄を行った本発明、具体的には実験例6と従来法1、実験例10と従来法2、実験例11と従来法3の含水率はほぼ同じ値であった。このことから、濾布速度が少なくとも0.5〜2m/minの範囲では、本願発明により、洗浄水単独の従来法1に比べて少ない洗浄水量であっても、気液混合ミストの有する強い貫通力により、濾布ベルト表面あるいは織目に食い込んだ汚泥粒子を洗い去ることで、濾布ベルト10,20の洗浄を行うことができるため、濾布ベルト洗浄水量を削減することが可能となることが確認できた。   When the filter cloth belts 10 and 20 are cleaned by the air-water combined cleaning according to the present invention, under the conditions of Experimental Examples 6, 10, and 11, the inside of the texture of the filter cloth belts 10 and 20 and the filter cloth belts 10 and 20 The sludge particles adhering to 20 can be sufficiently washed away, and visual observations have confirmed the same cleaning effect as in the conventional methods 1, 2, and 3. In Experimental Examples 6, 10, and 11, since the washing is good, stable dehydration treatment can be continued, and the moisture content of the dehydrated cake is 80 to 82% in Experimental Example 6, 79 to 81% in Experimental Example 10, In Experimental example 11, it was 82 to 84%. The filter cloth speed is the same, and the conventional method in which water cleaning is performed and the present invention in which air-water combined cleaning is performed, specifically, Experimental Example 6, Conventional Method 1, Experimental Example 10, Conventional Method 2, and Experimental Example 11 The water content of Conventional Method 3 was almost the same value. From this fact, when the filter cloth speed is at least in the range of 0.5 to 2 m / min, according to the present invention, strong penetration of the gas-liquid mixed mist can be achieved even if the amount of washing water is small compared to the conventional method 1 of washing water alone. The filter cloth belts 10 and 20 can be washed by washing off the sludge particles that have digged into the surface or texture of the filter cloth belt by force, so that it is possible to reduce the amount of filter cloth belt washing water. Was confirmed.

また、濾布速度0.5m/minとした実験例10の条件で、洗浄水量を0.75m/hから0.5m/hに削減した実験例12では、濾布ベルト10,20の織目内部や濾布ベルト洗浄面の反対側に残留している汚泥粒子を十分に洗い流すことが困難であり、濾布ベルト10,20の洗浄と脱水を繰り返すと次第に含水率が悪化し、最終的には圧搾脱水の工程で汚泥が濾布ベルト10,20から漏れ出る状態となった。 Further, in Experimental Example 12 in which the amount of washing water was reduced from 0.75 m 3 / h to 0.5 m 3 / h under the conditions of Experimental Example 10 with a filter cloth speed of 0.5 m / min, the filter cloth belts 10 and 20 It is difficult to sufficiently wash away the sludge particles remaining on the inside of the weave or on the side opposite to the cleaning surface of the filter cloth belt. Repeating washing and dewatering of the filter cloth belts 10 and 20 gradually deteriorates the moisture content, and finally Specifically, sludge leaked from the filter cloth belts 10 and 20 in the process of pressing and dewatering.

即ち濾布速度を遅くした実験例12の場合でも、実験例4と同様に洗浄水量を少なくすると、気液混合ミストの噴霧打力が弱まり、濾布ベルト10,20の洗浄が不十分となるため、濾布ベルト10,20が目詰まりし易い傾向にあり、安定した脱水処理の継続は困難であった。   That is, even in the case of Experimental Example 12 in which the filter cloth speed is reduced, if the amount of washing water is reduced as in Experimental Example 4, the spray striking force of the gas-liquid mixed mist is weakened, and the cleaning of the filter cloth belts 10 and 20 becomes insufficient. Therefore, the filter cloth belts 10 and 20 tend to be clogged, and it is difficult to continue the stable dehydration process.

以上の結果から、濾布速度が少なくとも0.5〜2m/minの範囲では、濾布ベルト10,20の洗浄に気体と液体とを混合した気液混合ミストを噴射する二流体ノズル60を使用することで、洗浄水量を削減することは可能であるが、洗浄水量として0.75m/h(濾布幅0.5m当り)が必要であった。また、濾布速度の速度に応じて、洗浄水量を変更する必要、具体的には濾布速度が速く、洗浄装置を通過する時間の短い場合に洗浄水量を高める、あるいは濾布速度が遅く、洗浄装置を通過する時間が長い場合に洗浄水量を下げる必要は無かった。 From the above results, when the filter cloth speed is at least in the range of 0.5 to 2 m / min, the two-fluid nozzle 60 for injecting gas-liquid mixed mist in which gas and liquid are mixed is used for cleaning the filter cloth belts 10 and 20. By doing so, it is possible to reduce the amount of washing water, but the amount of washing water required 0.75 m 3 / h (per 0.5 m filter cloth width). In addition, it is necessary to change the amount of washing water according to the speed of the filter cloth speed, specifically, the filter cloth speed is fast, and when the time to pass through the washing device is short, the amount of washing water is increased, or the filter cloth speed is slow, There was no need to reduce the amount of washing water when it took a long time to pass through the washing device.

このことは、二流体ノズル60を使用した気液混合ミストによる濾布ベルト10,20の洗浄においては、気液混合ミストの噴霧打力の強さが重要であることを示している。   This indicates that the strength of the spray hitting force of the gas / liquid mixed mist is important in cleaning the filter cloth belts 10 and 20 by the gas / liquid mixed mist using the two-fluid nozzle 60.

以上本発明の実施形態を説明したが、本発明は上記実施形態に限定されるものではなく、特許請求の範囲、及び明細書と図面に記載された技術的思想の範囲内において種々の変形が可能である。なお直接明細書及び図面に記載がない何れの形状や構造であっても、本願発明の作用・効果を奏する以上、本願発明の技術的思想の範囲内である。例えば、二流体ノズル60の構造は上記図2に示す構造のものに限定されず、要は気体と液体とを混合して噴霧打力を高めた気液混合ミストを噴射する機能を有している構造の二流体ノズルであれば、どのような構造であってもよい。またベルトプレス型脱水装置の構造が上記図1に示す構造のものに限定されないことは言うまでもなく、要は一対の無端状の濾布ベルトをそれぞれ複数個のロールに走行可能に掛装し、前記両濾布ベルトの一部分同士を互いに対面平行して走行するように設置し、前記対面平行とした濾布ベルトの間に汚泥を挟圧して脱水する構造のベルトプレス型脱水装置であれば、どのような構造のベルトプレス型脱水装置であっても本発明を適用できる。また上記例では、隣り合う二流体ノズルを濾布ベルトの進行方向に対して互い違いに前後に配置したが(即ち二流体ノズルを二列に配置したが)、本発明は、隣り合う二流体ノズルを濾布ベルトの進行方向に対して前後に配置するものであればよく、洗浄装置が過大になることに問題がなければ、例えば二流体ノズルを三列以上の列になるように配置しても良い。また上記例では、二流体ノズルから噴射される気液混合ミストのスプレーパターンSPの長手方向が濾布ベルト幅方向を向く(一致する)ように構成したが、前記スプレーパターンSPの長手方向が濾布ベルト幅方向と所定の角度θ(例えばθ=3〜45°)となるように各二流体ノズルの回転方向の取付角度を調節しても良い。その場合も、各スプレーパターンSPが重ならないようにすることが好ましい。   Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible. Note that any shape or structure not directly described in the specification and drawings is within the scope of the technical idea of the present invention as long as the effects and advantages of the present invention are achieved. For example, the structure of the two-fluid nozzle 60 is not limited to the structure shown in FIG. 2 described above. In short, the two-fluid nozzle 60 has a function of injecting a gas-liquid mixed mist in which a gas and a liquid are mixed to increase a spray hitting force. Any structure may be used as long as the two-fluid nozzle has a structure. Needless to say, the structure of the belt press-type dewatering device is not limited to the structure shown in FIG. 1 above. In short, a pair of endless filter cloth belts are movably mounted on a plurality of rolls, respectively, Any belt press type dewatering device that has a structure in which parts of both filter cloth belts are installed so as to run parallel to each other and dehydrated by sandwiching sludge between the filter cloth belts parallel to each other. The present invention can be applied even to a belt press type dehydrating apparatus having such a structure. Further, in the above example, the adjacent two-fluid nozzles are alternately arranged in front and back with respect to the traveling direction of the filter cloth belt (that is, the two-fluid nozzles are arranged in two rows). If there is no problem that the cleaning device becomes excessive, for example, two fluid nozzles may be arranged in three or more rows. Also good. In the above example, the longitudinal direction of the spray pattern SP of the gas-liquid mixed mist ejected from the two-fluid nozzle is oriented (matched) in the filter cloth belt width direction, but the longitudinal direction of the spray pattern SP is filtered. You may adjust the attachment angle of the rotation direction of each two-fluid nozzle so that it may become predetermined angle (theta) (for example, θ = 3-45 degrees) with the cloth belt width direction. Also in that case, it is preferable that the spray patterns SP do not overlap each other.

1 ベルトプレス型脱水装置
10,20 濾布ベルト
31,33,35,37 圧搾ロール
39,41,43 ロール
51 汚泥投入器
53,55 スクレーパ
60A,60B 洗浄装置
60 二流体ノズル
61 ノズル本体
63 ノズル
65 液体供給部材
67 主流路
69 気体導入部
71 オリフィス部
73 気液混合部
75 混合室
77 液体流路
79 液体導入部
81 第2オリフィス部
83 孔
85 噴射孔
87 段差面
89 気体供給管
91 空気流量計
93 調圧器
95 コンプレッサ
97 液体供給管
99 流量計
101 洗浄水ポンプ
103 洗浄水タンク
105 造粒槽
107 汚泥供給手段
109 薬液供給手段
111 汚泥貯槽
113 汚泥供給ポンプ
115 薬品溶解槽
117 薬品注入ポンプ
119 排水槽
121 排水ポンプ
123 脱水ケーキコンベヤ
DESCRIPTION OF SYMBOLS 1 Belt press type | mold dehydrator 10,20 Filter cloth belt 31,33,35,37 Squeezing roll 39,41,43 Roll 51 Sludge thrower 53,55 Scraper 60A, 60B Cleaning apparatus 60 Two-fluid nozzle 61 Nozzle main body 63 Nozzle 65 Liquid supply member 67 Main flow path 69 Gas introduction part 71 Orifice part 73 Gas-liquid mixing part 75 Mixing chamber 77 Liquid flow path 79 Liquid introduction part 81 Second orifice part 83 Hole 85 Injection hole 87 Step surface 89 Gas supply pipe 91 Air flow meter 93 Pressure regulator 95 Compressor 97 Liquid supply pipe 99 Flow meter 101 Wash water pump 103 Wash water tank 105 Granulation tank 107 Sludge supply means 109 Chemical liquid supply means 111 Sludge storage tank 113 Sludge supply pump 115 Chemical dissolution tank 117 Chemical injection pump 119 Drain tank 121 drain pump 123 removal Water cake conveyor

Claims (4)

一対の無端状の濾布ベルトをそれぞれ複数個のロールに走行可能に掛装し、前記両濾布ベルトの一部分同士を互いに対面平行して走行するように設置し、前記対面平行とした濾布ベルトの間に汚泥を挟圧して脱水するベルトプレス型脱水装置において、
前記各濾布ベルトの表面に付着した前記脱水後の汚泥を剥離するスクレーパと、
前記脱水後の汚泥を剥離した後の濾布ベルトの前記スクレーパよりも下流の洗浄位置に、気体と液体とを混合して噴霧打力を高めた気液混合ミストを噴射して濾布ベルトを洗浄する二流体ノズルを有する洗浄装置と、
を設置し、
前記一対の無端状の濾布ベルトの脱水ケーキが剥離した洗浄面を洗浄する際、前記二流体ノズルに供給する洗浄水全体の水量は、濾布ベルトの幅1m当り1.5m 3 /h以上で6.0m 3 /h未満、前記二流体ノズルに供給される気体圧力は、0.15〜0.5MPa、気体流量は、濾布ベルトの幅1m当り100〜300NL/min、前記濾布ベルトの送り速度は、0.5〜2m/minであり、
前記洗浄装置は、前記濾布ベルトの進行方向に対して交差する幅方向に向かって前記二流体ノズルを複数個併設し、且つ隣り合う二流体ノズルが前記進行方向に対して前後であって各々の二流体ノズルから脱水ケーキの剥離した洗浄面へ噴射される気液混合ミストが重ならない2mm〜3cmの距離を空けて配置して構成されていることを特徴とするベルトプレス型脱水装置。
A pair of endless filter cloth belts are respectively hangably mounted on a plurality of rolls, and a part of the two filter cloth belts are installed so as to run in parallel with each other. In a belt press type dewatering device that dewaters by sandwiching sludge between belts,
A scraper for peeling off the sludge after dehydration attached to the surface of each filter cloth belt;
After the dewatered sludge has been peeled off, the filter cloth belt is sprayed with a gas-liquid mixed mist in which a gas and a liquid are mixed to increase the spray hitting force at a cleaning position downstream of the scraper of the filter cloth belt. A cleaning device having a two-fluid nozzle for cleaning;
Install
When cleaning the cleaning surface from which the dewatered cake of the pair of endless filter cloth belts has peeled, the total amount of cleaning water supplied to the two-fluid nozzle is 1.5 m 3 / h or more per 1 m width of the filter cloth belt. Less than 6.0 m 3 / h, the gas pressure supplied to the two-fluid nozzle is 0.15 to 0.5 MPa, the gas flow rate is 100 to 300 NL / min per meter width of the filter cloth belt, the filter cloth belt The feed rate is 0.5-2 m / min,
The cleaning device is provided with a plurality of the two-fluid nozzles in the width direction intersecting the traveling direction of the filter cloth belt, and adjacent two-fluid nozzles are front and rear with respect to the traveling direction, respectively. A belt press-type dewatering device, characterized in that the gas-liquid mixed mist sprayed from the two-fluid nozzle to the cleaning surface from which the dewatered cake has been peeled is disposed at a distance d of 2 mm to 3 cm so as not to overlap.
前記請求項1に記載のベルトプレス型脱水装置であって、
前記複数の二流体ノズルを併設した洗浄装置は、前記一対の濾布ベルトにそれぞれ設置されていることを特徴とするベルトプレス型脱水装置。
The belt press type dehydrator according to claim 1,
The belt press-type dewatering device, wherein the plurality of two-fluid nozzles are installed in the pair of filter cloth belts.
前記請求項1又は2に記載のベルトプレス型脱水装置であって、The belt press type dehydrator according to claim 1 or 2,
前記噴射された気液混合ミストが、スリット状の噴射孔の形状に応じて広角扇形で、且つ噴霧厚さが薄いスプレーパターンとなり、該スプレーパターン全域にわたって粒径が均等で、空気量及び液量共に略均等となり、前記スリット状の噴射孔の長さ方向の噴射角度(広がり角度)αは60°〜80°に構成されていることを特徴とするベルトプレス型脱水装置。The sprayed gas-liquid mixed mist is a wide-angle fan-shaped spray pattern according to the shape of the slit-shaped spray hole and the spray thickness is thin, the particle size is uniform over the entire spray pattern, the amount of air and the amount of liquid The belt press-type dewatering device is characterized in that both of them are substantially equal, and the slit-like injection hole has an injection angle (spreading angle) α in the length direction of 60 ° to 80 °.
一対の無端状の濾布ベルトをそれぞれ複数個のロールに走行可能に掛装し、前記両濾布ベルトの一部分同士を互いに対面平行して走行するように設置し、前記対面平行とした濾布ベルトの間に汚泥を挟圧して脱水するベルトプレス型脱水装置において、A pair of endless filter cloth belts are respectively hangably mounted on a plurality of rolls, and a part of the two filter cloth belts are installed so as to run in parallel with each other. In a belt press type dewatering device that dewaters by sandwiching sludge between belts,
前記各濾布ベルトの表面に付着した前記脱水後の汚泥を剥離するスクレーパと、A scraper for peeling off the sludge after dehydration attached to the surface of each filter cloth belt;
前記脱水後の汚泥を剥離した後の濾布ベルトの前記スクレーパよりも下流の洗浄位置に、気体と液体とを混合して噴霧打力を高めた気液混合ミストをスリット状の噴射孔より噴射して脱水ケーキの剥離した洗浄面の濾布ベルトを洗浄する二流体ノズルを有する洗浄装置と、Gas-liquid mixed mist, in which gas and liquid are mixed to increase the spray hitting force, is injected from the slit-shaped injection hole at the cleaning position downstream of the scraper of the filter cloth belt after the dewatered sludge is peeled off. And a cleaning device having a two-fluid nozzle for cleaning the filter cloth belt on the cleaning surface from which the dewatered cake is peeled off,
を設置し、Install
前記一対の無端状の濾布ベルトの脱水ケーキが剥離した洗浄面を洗浄する際、前記二流体ノズルに供給する洗浄水全体の水量は、濾布ベルトの幅1m当り1.5mWhen cleaning the cleaning surface from which the dewatered cake of the pair of endless filter cloth belts has peeled, the total amount of cleaning water supplied to the two-fluid nozzle is 1.5 m per 1 m width of the filter cloth belt. 3Three /h以上で6.0m/ M over 6.0m 3Three /h未満、前記二流体ノズルに供給される気体圧力は、0.15〜0.5MPa、気体流量は、濾布ベルトの幅1m当り100〜300NL/min、前記濾布ベルトの送り速度は、0.5〜2m/minであり、/ H, the gas pressure supplied to the two-fluid nozzle is 0.15 to 0.5 MPa, the gas flow rate is 100 to 300 NL / min per 1 m of the width of the filter cloth belt, and the feed speed of the filter cloth belt is 0.5-2 m / min,
前記洗浄装置は、前記濾布ベルトの進行方向に対して交差する幅方向に向かって前記二流体ノズルを複数個併設し、且つ隣り合う二流体ノズルが前記進行方向に対して前後であって各々の二流体ノズルから噴射される気液混合ミストが重ならない距離を空けて配置し、The cleaning device is provided with a plurality of the two-fluid nozzles in the width direction intersecting the traveling direction of the filter cloth belt, and adjacent two-fluid nozzles are front and rear with respect to the traveling direction, respectively. The gas-liquid mixed mist ejected from the two-fluid nozzle is placed at a distance that does not overlap,
前記噴射された気液混合ミストが、噴射孔の形状に応じて広角扇形で、且つ噴霧厚さが薄いスプレーパターンとなり、該スプレーパターン全域にわたって粒径が均等で、空気量及び液量共に略均等となり、前記スリット状の噴射孔の長さ方向の噴射角度(広がり角度)αは60°〜80°に構成されていることを特徴とするベルトプレス型脱水装置。The sprayed gas-liquid mixed mist has a spray pattern with a wide-angle fan shape and a thin spray thickness according to the shape of the spray hole, and the particle size is uniform over the entire spray pattern, and the air amount and the liquid amount are substantially uniform. The belt-press type dehydrating apparatus is characterized in that an injection angle (spreading angle) α in the length direction of the slit-like injection hole is configured to be 60 ° to 80 °.
JP2014183158A 2014-09-09 2014-09-09 Belt press type dehydrator Active JP6276146B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014183158A JP6276146B2 (en) 2014-09-09 2014-09-09 Belt press type dehydrator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2014183158A JP6276146B2 (en) 2014-09-09 2014-09-09 Belt press type dehydrator

Publications (3)

Publication Number Publication Date
JP2016055247A JP2016055247A (en) 2016-04-21
JP2016055247A5 JP2016055247A5 (en) 2017-07-06
JP6276146B2 true JP6276146B2 (en) 2018-02-07

Family

ID=55756879

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2014183158A Active JP6276146B2 (en) 2014-09-09 2014-09-09 Belt press type dehydrator

Country Status (1)

Country Link
JP (1) JP6276146B2 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58135797A (en) * 1982-02-04 1983-08-12 Kobe Steel Ltd Washing device of belt press type dehydrator
JPS5927795A (en) * 1982-08-09 1984-02-14 Hitachi Plant Eng & Constr Co Ltd Sludge dehydrator
JPS616106A (en) * 1984-06-20 1986-01-11 Nippon Kokan Kk <Nkk> Method and apparatus for washing hemihydrate gypsum filter in manufacture of phosphoric acid by wet process
JP4820087B2 (en) * 2004-12-16 2011-11-24 株式会社いけうち Two-fluid nozzle
JP6054779B2 (en) * 2013-03-12 2016-12-27 水ing株式会社 Belt press type dehydrator

Also Published As

Publication number Publication date
JP2016055247A (en) 2016-04-21

Similar Documents

Publication Publication Date Title
JP4988435B2 (en) Screw press
DE60038745T2 (en) DEVICE FOR CLEANING WASTE WATER
CN201275920Y (en) Water-saving conduction band water washing apparatus
FI90500B (en) Water clarification equipment for the removal of fines larger than a predetermined size
EP0731212A1 (en) Cleaning device
JP6054779B2 (en) Belt press type dehydrator
DE10039558B4 (en) Device for spray treatment of printed circuit boards
KR101051936B1 (en) Screw press having air bubble inject type cleaning device
JP5059908B2 (en) Screw press
US20040074835A1 (en) Dewatering system
DE102005026080B4 (en) Bottle washer
JP6276146B2 (en) Belt press type dehydrator
JP5030912B2 (en) Dehydrator and belt cleaning method for dehydrator
CN211960847U (en) Bubble cleaning machine
US11925884B2 (en) Flotation device
JP2016182582A (en) Belt cleaner of belt-type filtration thickener
JP4620579B2 (en) Screw press
KR100679132B1 (en) Filter sand washing equipment with pipe injection for the type penetration
CN214516334U (en) Tea washing production line
KR101094188B1 (en) Water treatment system using dissolved air flotation
JP7161843B2 (en) Filter cloth belt washing method for filter cloth belt type dehydrator
CN112640763A (en) Spray extruded coconut husk desalination device
CN112390494A (en) Squeezing type solid-liquid separation filter unit
KR100913157B1 (en) Device for removing waste paper in oil cleaning Equipment
JP2014172018A5 (en)

Legal Events

Date Code Title Description
A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170523

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20170523

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20171020

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20171024

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20171218

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20180109

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20180111

R150 Certificate of patent or registration of utility model

Ref document number: 6276146

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250