JP2007144390A - Sand separating and washing device - Google Patents

Sand separating and washing device Download PDF

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JP2007144390A
JP2007144390A JP2006153254A JP2006153254A JP2007144390A JP 2007144390 A JP2007144390 A JP 2007144390A JP 2006153254 A JP2006153254 A JP 2006153254A JP 2006153254 A JP2006153254 A JP 2006153254A JP 2007144390 A JP2007144390 A JP 2007144390A
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sand
bottom wall
solid
water
liquid separation
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JP4798619B2 (en
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Taisuke Nakano
泰典 中野
Terukazu Araoka
輝一 新阜
Keisei Hayashida
恵星 林田
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Hitachi Plant Technologies Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand separating and washing device which removes the odor of polluted sand drawn up from a sand segmentation pond and very efficiently removes foreign substances contained in the sand. <P>SOLUTION: A solid-liquid separation tank 1 is provided with a cylindrical tube wall 3 which generates swirling flow flowing down along a peripheral wall by pouring polluted sand-containing water in a tangential direction; a bottom wall 4 comprising an inverted truncated cone shaped sieve arranged in the bottom part of the tube wall 3; and a draining duct 5 which drains water around the center of the bottom wall 4 to the outside with a pump 8. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、砂分離洗浄装置に関し、特に、沈砂池等から揚砂された汚砂の臭気を除去するとともに砂中に含まれる夾雑物を高度に除去することを可能とした砂分離洗浄装置に関するものである。   The present invention relates to a sand separation and cleaning device, and more particularly, to a sand separation and cleaning device capable of removing odor of dirty sand pumped from a sand basin and the like and highly removing impurities contained in the sand. Is.

従来、下水処理場や浄水場等の沈砂池からポンプを用いて揚砂された沈砂は、比重差分離、遠心分離等を用いた固液分離装置により固液分離され、砂分のみを回収するようにしている。   Conventionally, sand that has been pumped from a sand basin such as a sewage treatment plant or water purification plant using a pump is solid-liquid separated by a solid-liquid separation device using specific gravity difference separation, centrifugation, etc., and only the sand content is collected. I am doing so.

ところで、近年、廃棄物に関する規制が厳しくなり、夾雑物が含まれている沈砂は、産業廃棄物として取り扱われ、その処分コストが膨大となり問題となっている。
一方、沈砂を一般廃棄物として処分（又は再利用）するためには、熱灼減量が１０％以下であることに加え、沈砂に含まれる夾雑物を確実に分離除去する必要がある。 By the way, in recent years, regulations regarding wastes have become stricter, and sedimentation sand containing foreign matters is handled as industrial waste, and its disposal cost has become enormous.
On the other hand, in order to dispose (or reuse) the sand sediment as general waste, it is necessary to reliably separate and remove impurities contained in the sand sediment in addition to the heat loss being 10% or less.

しかしながら、沈砂の回収率と夾雑物の除去率は、トレードオフの関係にあり、固液分離装置で夾雑物の除去率を改善しようとすると、沈砂の回収率が著しく悪化し、沈砂池内に貯留された沈砂を回収するための機器の運転時間が長くなり、ランニングコストが上昇するという問題があった。   However, there is a trade-off between the collection rate of sedimentation and the removal rate of contaminants. If an attempt is made to improve the removal rate of contaminants using a solid-liquid separator, the recovery rate of sedimentation will be significantly deteriorated and stored in the sedimentation basin. There is a problem that the operation time of the equipment for collecting the settling sand becomes longer and the running cost increases.

本発明は、上記従来の沈砂の処理に関する問題点に鑑み、沈砂池等から揚砂された汚砂の臭気を除去するとともに砂中に含まれる夾雑物を高度に除去することを可能とした砂分離洗浄装置を提供することを目的とする。   The present invention, in view of the above-described problems related to the treatment of settling sand, removes the odor of the sand that has been pumped from a settling basin and the like, and at the same time, removes impurities contained in the sand at a high level. An object is to provide a separation and cleaning apparatus.

上記目的を達成するため、本第１発明の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の中心付近の水をポンプにより外部に排出する排水ダクトとを備えたことを特徴とする。   In order to achieve the above object, a sand separation and washing apparatus according to the first aspect of the present invention is a sand equipped with a solid / liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid / liquid separation tank. In the separation and washing apparatus, the solid-liquid separation tank is disposed at a cylindrical tubular wall that generates a swirling flow that descends along the peripheral wall by flowing the sewage mixed water in a tangential direction, and a bottom portion of the cylindrical wall. Further, the present invention is characterized by comprising a bottom wall made of a screen having an inverted frustoconical shape and a drainage duct for discharging water near the center of the bottom wall to the outside by a pump.

この場合において、排水ダクトに逆洗ポンプを接続することができる。   In this case, a backwash pump can be connected to the drain duct.

また、底壁の開口部に下方から気泡を供給し、底壁の中心付近に乱流を発生させるエア供給装置を設けることができる。   In addition, an air supply device that supplies air bubbles from below to the opening of the bottom wall and generates turbulence near the center of the bottom wall can be provided.

また、エア供給装置が、底壁の裏面に下方から気泡を供給することができる。   Further, the air supply device can supply bubbles from below to the back surface of the bottom wall.

一方、同じ目的を達成するため、本第２発明の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の開口部と固液分離槽の上部とを接続しポンプにより循環する循環ダクトと、該循環ダクトの一部に接続されたエジェクタとを備えたことを特徴とする。   On the other hand, in order to achieve the same object, the sand separation and washing apparatus of the second invention includes a solid / liquid separation tank into which the sewage mixed water is introduced, and a sedimentation tank installed under the solid / liquid separation tank. In the sand separation and washing apparatus, the solid-liquid separation tank is disposed at a cylindrical cylindrical wall that generates a swirling flow that descends along the peripheral wall by flowing the sewage mixed water in a tangential direction, and a bottom of the cylindrical wall. A bottom wall comprising an inverted frusto-conical sieve, a circulation duct that connects the opening of the bottom wall and the upper part of the solid-liquid separation tank and circulates by a pump, and is connected to a part of the circulation duct. And an ejector.

この場合において、前記底壁を上下動可能に弾支することができる。   In this case, the bottom wall can be elastically supported so as to be movable up and down.

また、前記沈降槽に給水する給水装置を設けることができる。   Moreover, the water supply apparatus which supplies water to the said sedimentation tank can be provided.

また、ごみに付着させる微細気泡を底壁の開口部付近で発生する微細気泡発生装置を設けることができる。   In addition, a fine bubble generating device that generates fine bubbles to be attached to the dust near the opening of the bottom wall can be provided.

本第１発明の砂分離洗浄装置によれば、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の中心付近の水をポンプにより外部に排出する排水ダクトとを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁の篩により砂と砂利とを粒径分離し、これにより、底壁の中心付近に比重差の大きいごみと砂利とを集め、比重の大きい砂利は底壁中心から沈降槽に落下させて砂と共に回収する一方、比重の小さいごみを効率よく選択的に排水ダクトにより水と共に排出することができる。
すなわち、従来では、砂とごみ、砂利が混在した状態で比重差分離をしていることから、砂の流出を抑えるために、排水ダクトの吸込流速を大きくすることができなかったが、本発明では、比重が大きく異なる砂利とごみを比重差分離するため、従来に比べて吸込流速を大きくすることが可能となり、ごみの除去効率を高めることができる。
そして、ポンプを用いた排水ダクトの強い吸込流で沈降槽内の水を吸い込むことにより、底壁の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
さらに、排水ダクトをポンプで駆動することにより、多量のし渣が投入されても排水ダクトが閉塞しにくく、万が一排水ダクトが閉塞した場合でも、ポンプの真空度（差圧）や電動逆止弁の開度計等で容易に制御することができ、また、配置を選ぶことなく、分離したし渣をし渣系設備や汚水沈砂池等に容易に圧送することができる。
また、投入される汚砂混合水の沈砂濃度、し渣濃度はその都度変わるので、ポンプのない無動力式の排水ダクトではその閉塞有無等の日常の点検頻度が多くなるが、ポンプ駆動の排水ダクトでは、電気的な制御が可能となり日常点検が不要で信頼性が向上する。 According to the sand separation and washing apparatus of the first invention, in the sand separation and washing apparatus provided with a solid-liquid separation tank into which dirty sand mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, The solid-liquid separation tank has a cylindrical cylindrical wall that generates a swirling flow that descends along the peripheral wall by flowing sewage mixed water in a tangential direction, and an inverted truncated cone disposed at the bottom of the cylindrical wall Since a bottom wall made of a sieve and a drainage duct that discharges water near the center of the bottom wall to the outside by a pump, the sand and dust are dispersed and separated by specific gravity by centrifugal force due to swirling flow. At the same time, the sand and gravel are separated by the particle size by the sieve of the bottom wall, thereby collecting dust and gravel with large specific gravity near the center of the bottom wall, and gravel with large specific gravity falls from the center of the bottom wall to the sedimentation tank While collecting with sand, drainage duct with low specific gravity efficiently and selectively It can be more discharged together with water.
That is, conventionally, since the specific gravity difference separation is performed in a state where sand, dust, and gravel are mixed, the suction flow velocity of the drainage duct cannot be increased in order to suppress the outflow of sand. Then, since gravel and waste having different specific gravities are separated by specific gravity difference, the suction flow velocity can be increased as compared with the conventional case, and the removal efficiency of dust can be increased.
And by sucking the water in a sedimentation tank with the strong suction flow of the drainage duct using a pump, the sieve passage flow rate of a bottom wall can be increased, and thereby the sieving effect can be enhanced.
In addition, by driving the drainage duct with a pump, the drainage duct is difficult to block even if a large amount of residue is thrown in. Even if the drainage duct is blocked, the pump vacuum degree (differential pressure) and the electric check valve It is possible to control easily with an opening meter, etc., and it is possible to easily feed the separated residue to a residue system facility, a sewage settling basin or the like without selecting an arrangement.
In addition, since the sediment concentration and sediment concentration of the sewage-mixed water that is input changes each time, a non-powered drainage duct without a pump increases the frequency of daily inspections such as the presence or absence of clogging. Ducts can be electrically controlled and do not require daily inspection, improving reliability.

この場合、排水ダクトに逆洗ポンプを接続することにより、万が一排水ダクトが閉塞した場合でも、排水ダクト内に水を送って逆洗することができる。   In this case, by connecting a backwash pump to the drainage duct, water can be backwashed by sending water into the drainage duct even if the drainage duct is blocked.

また、底壁の開口部に下方から気泡を供給し、底壁の中心付近に乱流を発生させるエア供給装置を設けることにより、旋回流によって縦向きの姿勢で集められる薄板状のごみを、乱流によって排水ダクトに吸い込まれやすい姿勢にすることができ、これにより、沈降しやすい薄板状のごみを排水ダクトで吸い込んで排出することができる。   In addition, by providing an air supply device that supplies air bubbles from below to the opening of the bottom wall and generates a turbulent flow near the center of the bottom wall, thin-plate-like garbage collected in a vertical orientation by swirling flow, It is possible to make the posture easy to be sucked into the drainage duct by the turbulent flow, and thus, thin plate-like dust that tends to settle can be sucked into the drainage duct and discharged.

また、エア供給装置が、底壁の裏面に下方から気泡を供給することにより、逆洗時に、底壁の篩に付着したごみをエアブロー効果により浮上させることができる。   In addition, the air supply device supplies air bubbles from below to the back surface of the bottom wall, so that dust attached to the bottom wall screen can be floated by the air blow effect during backwashing.

また、本第２発明の砂分離洗浄装置によれば、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の開口部と固液分離槽の上部とを接続しポンプにより循環する循環ダクトと、該循環ダクトの一部に接続されたエジェクタとを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁の篩により砂と砂利とを粒径分離して、底壁の中心付近に比重差の大きいごみと砂利を集め、エジェクタ及び循環ダクトにより一定時間毎に溜まったごみと砂利を固液分離槽内を再循環させ、運転完了後に残ったごみや砂利を槽外に引き抜くことにより、砂利と共に沈降する可能性のあるレキ片やガラス片と区別し、砂のみを回収することができる。
そして、ポンプを用いた循環ダクトの強い吸込流で沈降槽内の水を吸い込むことにより、底壁の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
さらに、循環ダクトをポンプで駆動することにより、多量のし渣が投入されても循環ダクトが閉塞しにくく、万が一循環ダクトが閉塞した場合でも、ポンプの真空度（差圧）や電動逆止弁の開度計等で容易に制御することができ、また、配置を選ぶことなく、分離したし渣をし渣系設備や汚水沈砂池等に容易に圧送することができる。
また、投入される汚砂混合水の沈砂濃度、し渣濃度はその都度変わるので、ポンプのない無動力式の循環ダクトではその閉塞有無等の日常の点検頻度が多くなるが、ポンプ駆動の循環ダクトでは、電気的な制御が可能となり日常点検が不要で信頼性が向上する。
なお、本砂分離洗浄装置において、処分上、砂利とごみは分離する必要があるため、砂利ごみ分離機が必要となるが、砂利ごみ分離機は従来製品の上向流式分級機等を用いることができる。 Moreover, according to the sand separation and washing apparatus of the second invention, the sand separation and washing apparatus provided with a solid-liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid-liquid separation tank. The solid-liquid separation tank has a cylindrical cylindrical wall that generates a swirling flow that descends along the peripheral wall by flowing the sewage mixed water in a tangential direction, and an upside-down cutting disposed at the bottom of the cylindrical wall. A bottom wall formed of a head-cone-shaped sieve, a circulation duct connecting the opening of the bottom wall and the upper part of the solid-liquid separation tank and circulating by a pump, and an ejector connected to a part of the circulation duct Therefore, the sand and waste are dispersed and separated by specific gravity difference by centrifugal force generated by the swirling flow, and the sand and gravel are separated by particle size by the sieve of the bottom wall. And collect the garbage and gravel collected at regular intervals by the ejector and the circulation duct. By recirculating the inside of the liquid separation tank and removing the dust and gravel remaining after the operation is completed, it is possible to distinguish only the sand and glass pieces that may settle with the gravel and collect only the sand. .
And by sucking the water in a sedimentation tank with the strong suction flow of the circulation duct using a pump, the sieve passage flow rate of a bottom wall can be increased and, thereby, the sieving effect can be improved.
Furthermore, by driving the circulation duct with a pump, the circulation duct is difficult to close even if a large amount of residue is thrown in. Even if the circulation duct is blocked, the vacuum degree (differential pressure) of the pump and the electric check valve It is possible to control easily with an opening meter, etc., and it is possible to easily feed the separated residue to a residue system facility, a sewage settling basin or the like without selecting an arrangement.
In addition, since the sediment concentration and sediment concentration of the sewage-mixed water that is input changes each time, a non-powered circulation duct without a pump increases the frequency of daily inspections such as the presence or absence of clogging. Ducts can be electrically controlled and do not require daily inspection, improving reliability.
In this sand separation and cleaning device, gravel and waste need to be separated for disposal, so a gravel waste separator is required, but the gravel waste separator uses a conventional product such as an up-flow classifier. be able to.

この場合、前記底壁を上下動可能に弾支することにより、汚砂混合水投入時に、砂利やごみの衝突、ごみの堆積や旋回流により常に変動する水圧等により、底壁の篩が振動（揺動）し、篩面で捕捉された砂利には常に上下方向の慣性力が働くことになり、篩目への砂利の挟まりを防止することができる。
また、運転完了後、ドレンで水を引き抜きながら、流入管から水を流入させると、流入水の落下エネルギーをばねのたわみエネルギーに変換することができ、流入を止めると篩は減衰振動を始めることから、この減衰振動による慣性力により逆洗による篩目清掃効果を得ることができる。 In this case, by supporting the bottom wall so that it can move up and down, the sieve on the bottom wall vibrates due to gravel and dust collision, water pressure constantly changing due to dust accumulation and swirling flow, etc. Gravitational force that swings and grabs on the sieving surface always has an inertial force in the vertical direction, so that gravel can be prevented from being caught in the sieving.
In addition, after the operation is complete, if water is introduced from the inflow pipe while drawing water with the drain, the falling energy of the inflowing water can be converted into the bending energy of the spring, and when the inflow is stopped, the sieve starts damped vibration. Therefore, the mesh cleaning effect by backwashing can be obtained by the inertial force due to the damped vibration.

また、前記沈降槽に給水する給水装置を設けることにより、投入砂量が少ない場合に給水し、固液分離槽の篩面に対して上昇流を発生させ、旋回流によるし渣の張り付きを少なくすることができる。   In addition, by providing a water supply device for supplying water to the settling tank, water is supplied when the amount of sand input is small, an upward flow is generated with respect to the sieve surface of the solid-liquid separation tank, and sticking of the residue due to swirling flow is reduced. can do.

また、ごみに付着させる微細気泡を底壁の開口部付近で発生する微細気泡発生装置を設けることにより、水を吸い重くなったタバコのフィルタや、旋回流によって縦向きの姿勢となった薄板状のごみに対し、微細気泡を付着させることによって浮上させるとともに、乱流によって排水ダクトに吸い込まれやすい縦向き以外の姿勢にし、これにより、水を吸い重くなったタバコのフィルタや、沈降しやすい薄板状のごみを排水ダクトの上向流で吸い込むようにして、ごみの分離効果を上げることができる。   In addition, by providing a micro-bubble generator that generates micro-bubbles that adhere to the dust near the opening of the bottom wall, the filter for cigarettes that have absorbed water and a thin plate shape that has a vertical orientation due to swirling flow In addition to the fine air bubbles attached to the garbage, it is placed in a posture other than the vertical orientation that tends to be sucked into the drainage duct by turbulent flow, so that the cigarette filter that has absorbed water and a thin plate that tends to settle The waste separation effect can be improved by sucking the waste in the upward direction of the drainage duct.

以下、本発明の砂分離洗浄装置の実施の形態を、図面に基づいて説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sand separation and cleaning apparatus of the present invention will be described with reference to the drawings.

図１〜図２に、本発明の砂分離洗浄装置の第１実施例を示す。
この砂分離洗浄装置は、汚砂混合水が導入される固液分離槽１と、該固液分離槽１の下に設置される沈降槽２とを備えている。
そして、この砂分離洗浄装置は、固液分離槽１に、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁３と、該筒壁３の底部に配設された逆さ裁頭円錐状の篩からなる底壁４と、該底壁４の中心付近の水をポンプ８により外部に排出する排水ダクト５とを備える。 1 to 2 show a first embodiment of the sand separation and cleaning apparatus of the present invention.
This sand separation and cleaning device includes a solid-liquid separation tank 1 into which dirty sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1.
And this sand separation washing | cleaning apparatus has the cylindrical cylinder wall 3 which generate | occur | produces the swirl | vortex flow which descends along a surrounding wall by flowing in the solid-liquid separation tank 1 in the tangential direction, and this cylinder wall 3 The bottom wall 4 made of an inverted frustoconical sieve disposed at the bottom of the bottom wall 4 and the drainage duct 5 for discharging the water near the center of the bottom wall 4 to the outside by the pump 8 are provided.

筒壁３の上部には、反転した旋回流を越流させる分離ホッパ６が設けられるとともに、該分離ホッパ６と筒壁３との間を旋回流が通るように汚砂混合水の流入管７が接線方向に接続されている。
流入管７には、ジェットポンプ等の揚砂ポンプ（図示省略）から汚砂混合水が圧送され、また、分離ホッパ６の周囲には、該分離ホッパ６の越流水を受ける環状の越流トラフ６１が設置されている。 A separation hopper 6 for allowing the inverted swirling flow to flow over is provided at the upper part of the cylindrical wall 3, and an inflow pipe 7 for the mixed waste sand so that the swirling flow passes between the separating hopper 6 and the cylindrical wall 3. Are connected tangentially.
The inflow pipe 7 is pumped with sand mixed water from a sand pump (not shown) such as a jet pump, and an annular overflow trough that receives the overflow water of the separation hopper 6 around the separation hopper 6. 61 is installed.

底壁４は、パンチングスクリーン等により篩目が形成されたすり鉢状のものからなり、中央部には開口部４１が形成されている。
この底壁４は、図示省略するが、コイルばね等によって上下動可能に弾支することも可能であり、これにより、汚砂混合水の投入時に、砂利やごみの衝突、ごみの堆積や旋回流により常に変動する水圧等により、底壁４の篩が振動（揺動）し、篩面で捕捉された砂利には常に上下方向の慣性力が働くことになり、篩目への砂利の挟まりを防止することができる。 The bottom wall 4 is formed in a mortar shape having a sieve mesh formed by a punching screen or the like, and an opening 41 is formed at the center.
Although not shown, the bottom wall 4 can be elastically supported by a coil spring or the like so as to be movable up and down. The sieve of the bottom wall 4 vibrates (oscillates) due to the water pressure constantly fluctuating depending on the flow, and the gravitational force captured by the sieve surface always acts on the gravel, so that gravel is trapped in the sieve mesh. Can be prevented.

排水ダクト５は、底壁中心の上方に開口部を有する管からなり、途中に配設した真空ポンプ８を駆動させることにより、篩目から沈降する砂を吸い込まない程度の吸込流を発生させ、底壁４の中心付近に集まる砂利とごみの内、比重の小さいごみだけを水と共に吸い込んで外部に排出するようにしている。
また、排水ダクト５には、後述する逆洗管１８の逆洗ポンプ２１からの配管が接続されており、万が一排水ダクト５が閉塞した場合にバルブを切り替え、排水ダクト５内に水を送り、排水ダクト５内を逆洗するようにしている。 The drainage duct 5 is composed of a pipe having an opening above the center of the bottom wall, and by driving a vacuum pump 8 disposed in the middle, a suction flow is generated so as not to suck sand settling from the sieve mesh, Of the gravel and garbage collected near the center of the bottom wall 4, only the dust with a small specific gravity is sucked together with water and discharged to the outside.
The drain duct 5 is connected to a pipe from a back-wash pump 21 of the back-wash pipe 18 which will be described later. If the drain duct 5 is blocked, the valve is switched, and water is sent into the drain duct 5. The inside of the drainage duct 5 is backwashed.

沈降槽２は、固液分離槽１の下に底壁４を境として連続的に配設されており、本実施例では、下部にスクリューコンベア９が一体に配設された矩形のものからなる。
沈降槽２には、この沈降槽２に給水する給水装置が設けられており、本実施例では、底壁４の下面に向かって水を噴射する逆洗ノズル１０と共用されている。 The sedimentation tank 2 is continuously disposed below the solid-liquid separation tank 1 with the bottom wall 4 as a boundary. In this embodiment, the sedimentation tank 2 is formed in a rectangular shape in which a screw conveyor 9 is integrally disposed at the lower part. .
The settling tank 2 is provided with a water supply device for supplying water to the settling tank 2. In this embodiment, the settling tank 2 is shared with the backwash nozzle 10 that jets water toward the bottom surface of the bottom wall 4.

一方、上記砂分離洗浄装置において、図３に示すように、底壁４の開口部４１に下方から気泡を供給し、底壁４の中心付近に乱流を発生させるエア供給装置１４を設けることができる。
エア供給装置１４は、ブロア１５から配管１６を介して、底壁４の開口部４１の下方に設置した散気ノズル１７から多数の微細気泡を発生させる。
また、このエア供給装置１４は、図４に示すように、底壁４の裏面に下方から微細気泡を供給することもできる。
例えば、底壁４の下に設置した逆洗管１８から逆洗水を供給するときには、逆洗効果を高めるために、ブロア１５からのエアを散気ノズル１７側から底壁裏面の逆洗ノズル１９側にバルブを切り替え、底壁４の篩に付着したごみをエアブロー効果により浮上させることができる。 On the other hand, in the sand separating and cleaning apparatus, as shown in FIG. 3, an air supply device 14 is provided for supplying air bubbles from below to the opening 41 of the bottom wall 4 and generating turbulence near the center of the bottom wall 4. Can do.
The air supply device 14 generates a large number of fine bubbles from the air diffuser nozzle 17 installed below the opening 41 of the bottom wall 4 from the blower 15 through the pipe 16.
Further, as shown in FIG. 4, the air supply device 14 can also supply fine bubbles to the back surface of the bottom wall 4 from below.
For example, when backwash water is supplied from a backwash pipe 18 installed under the bottom wall 4, in order to enhance the backwash effect, air from the blower 15 is blown from the diffuser nozzle 17 side to the backwash nozzle on the back of the bottom wall. The valve is switched to the 19th side, and the dust adhering to the sieve of the bottom wall 4 can be floated by the air blow effect.

ところで、砂分離洗浄装置では、図５に示すように、ごみは、底壁４の表面上に形成される旋回流に乗って底壁４の中心付近に集まり、排水ダクト５の上向流によって引き抜かれるようになっている。
この場合、例えば、缶ジュースのプルタブや厚みの薄いゴム類等の薄板状のごみ２０は、旋回流に対しては、水流を受ける面積が大きいことから流れに乗りやすい。
ところが、この薄板状のごみ２０は、旋回流の作用によって縦向きの姿勢で集まることから、上向流に対しては水流を受ける面積が小さくなって流れに乗りにくくなり、これにより底壁４の開口部４１から沈降する。
そこで、図３に示すように、底壁４の開口部４１に下方から気泡を供給し、底壁４の中心付近に乱流を発生させることにより、縦向きの姿勢で集められた薄板状のごみ２０を、乱流によって排水ダクト５に吸い込まれやすい縦向き以外の姿勢にし、これにより、沈降しやすい薄板状のごみ２０を排水ダクト５の上向流で吸い込むようにする。 By the way, in the sand separating and cleaning apparatus, as shown in FIG. 5, the dust collects on the swirl flow formed on the surface of the bottom wall 4 and gathers in the vicinity of the center of the bottom wall 4. It is designed to be pulled out.
In this case, for example, the thin-plate-like garbage 20 such as a pull tab of can juice or a thin rubber can easily ride on the swirling flow because the area receiving the water flow is large.
However, since the thin-plate-like garbage 20 is collected in a vertical posture by the action of the swirling flow, the area that receives the water flow becomes small with respect to the upward flow, and it becomes difficult to ride the flow. It settles from the opening part 41.
Therefore, as shown in FIG. 3, by supplying bubbles to the opening 41 of the bottom wall 4 from below and generating turbulent flow near the center of the bottom wall 4, a thin plate-like shape gathered in a vertically oriented posture. The garbage 20 is placed in a posture other than the vertical direction in which it is easily sucked into the drainage duct 5 by turbulent flow, so that the thin plate-like dust 20 that tends to sink is sucked in the upward flow of the drainage duct 5.

また、タバコのフィルタ２２など水分を吸収しやすい性状のものは、水分を吸収して重くなっているために上向流に乗りにくく、底壁４の開口部４１から沈降する。
薄板状のごみ２０も、前記したように、旋回流の作用によって縦向きの姿勢で底壁４の中央に集まり、上向流に対しては水流を受ける面積が小さくなるため、流れに乗りにくく、同様に中央の開口部４１から沈降する。
このように、底壁４の開口部４１から一部のごみが沈降してしまい、その結果、分離効果が悪くなるという問題がある。
これに対し、本実施例では、図７に示すように、ごみに付着させる微細気泡を底壁４の開口部４１付近で発生する微細気泡発生装置２３を設けることにより、水を吸い重くなったタバコのフィルタ２２や、旋回流によって縦向きの姿勢となった薄板状のごみ２０に対し、微細気泡を付着させることによって浮上させるとともに、乱流によって排水ダクト５に吸い込まれやすい縦向き以外の姿勢にし、これにより、水を吸い重くなったタバコのフィルタ２２や、沈降しやすい薄板状のごみ２０を排水ダクト５の上向流で吸い込むようにして、ごみの分離効果を上げるようにしている。 In addition, a material that easily absorbs moisture, such as the cigarette filter 22, absorbs moisture and is difficult to ride upward, and settles from the opening 41 of the bottom wall 4.
As described above, the thin-plate-like garbage 20 also gathers in the center of the bottom wall 4 in a vertical posture due to the action of the swirling flow, and the area that receives the water flow becomes small for the upward flow, so it is difficult to ride the flow. Similarly, the liquid settles from the central opening 41.
Thus, there is a problem that part of the dust settles from the opening 41 of the bottom wall 4 and as a result, the separation effect is deteriorated.
On the other hand, in this embodiment, as shown in FIG. 7, the provision of the fine bubble generating device 23 that generates the fine bubbles to be attached to the dust near the opening 41 of the bottom wall 4 makes the water sucked up. The tobacco filter 22 and the thin-plate-like dust 20 that has been placed in the vertical orientation by the swirling flow are floated by adhering fine bubbles, and the posture other than the vertical orientation that is easily sucked into the drainage duct 5 by the turbulent flow Thus, the cigarette filter 22 that has absorbed water and the thin plate-like dust 20 that easily settles are sucked in the upward flow of the drainage duct 5 to increase the separation effect of the dust.

次に、この砂分離洗浄装置の動作を説明する。
ジェットポンプ等の揚砂ポンプから投入された汚砂混合水を、円筒型の固液分離槽１の接線方向から流入させることで旋回流を発生させる。
ここで発生させた旋回流による遠心力で砂と砂利とごみとが分散され、比重差分離されるとともに、底壁４の円錐篩で砂とごみを粒径分離する。
水流篩効果により円錐篩を通過した砂は矩形型の沈降槽２に沈降し、スクリューコンベア９で搬出される。 Next, the operation of this sand separation and cleaning apparatus will be described.
A swirl flow is generated by flowing the sewage mixed water supplied from a sand pump such as a jet pump from the tangential direction of the cylindrical solid-liquid separation tank 1.
Sand, gravel, and dust are dispersed by centrifugal force generated by the swirling flow generated here and separated by specific gravity, and sand and dust are separated by a conical sieve on the bottom wall 4.
The sand that has passed through the conical sieve due to the water sieve effect settles in the rectangular sedimentation tank 2 and is carried out by the screw conveyor 9.

一方、篩形状を円錐型としたことと旋回流によるスワール効果の相乗作用により、分離されたごみ及び砂利が自然に底壁４の中心付近に集まる。
そして、底壁４の中心で発生させた吸込流によりごみは排水と共に越流させ、また、砂利は底壁４の開口部４１から沈降槽２に落下させ、砂と共に搬出させる。
従来の洗砂機は、砂とごみ、砂利が混在した状態で比重差分離をしていることから、砂の流出を抑えるために、排水ダクト５の吸込流速を大きくすることができなかったが、ここでは砂利とごみの重さが大きく異なるため、従来に比べて吸込流速を大きくすることが可能となり、ごみの除去効率を高めることができる。
また、排水ダクト５の吸込流により矩形型沈降槽２内にも流れを生じさせることで、篩の通過流量を増すことができ、篩効果を高めることができる。 On the other hand, the separated dust and gravel naturally gather near the center of the bottom wall 4 due to the synergistic effect of the conical shape of the sieve and the swirl effect caused by the swirling flow.
Then, the dust is caused to overflow with the drainage by the suction flow generated at the center of the bottom wall 4, and the gravel is dropped from the opening 41 of the bottom wall 4 to the settling tank 2 and carried out together with the sand.
Since the conventional sand washer separates the specific gravity in a state where sand, dust and gravel are mixed, the suction flow velocity of the drainage duct 5 could not be increased in order to suppress the outflow of sand. In this case, since the gravel and garbage are greatly different in weight, it is possible to increase the suction flow velocity as compared with the conventional case, and it is possible to increase the efficiency of removing the dust.
In addition, by causing a flow in the rectangular sedimentation tank 2 by the suction flow of the drainage duct 5, the passing flow rate of the sieve can be increased, and the sieving effect can be enhanced.

また、運転完了後もしくは集砂時に、篩面を逆洗することで篩面に付着したし渣や砂利を除去するようにする（ジェットポンプ式は１台の駆動水ポンプで揚砂、集砂を行うことが多く、この場合、洗浄槽内への沈砂投入は間欠投入である）。
同様に、篩面へのし渣の絡みつきを抑える目的で、沈降槽２に給水することができ、これにより、篩面に対して上昇流が発生し、旋回流によるし渣の張り付きを少なくすることができる。
ただし、旋回流による下降流量が減少し、篩能力が落ちるため、投入砂量が少ない場合に限定される。 In addition, after the operation is completed or during sand collection, the screen surface is back-washed to remove residue and gravel attached to the screen surface (the jet pump type uses a single drive water pump for sanding and sand collection) In this case, the sand settling into the washing tank is intermittent).
Similarly, water can be supplied to the settling tank 2 for the purpose of suppressing the entanglement of the screen residue on the screen surface, thereby generating an upward flow with respect to the screen surface and reducing sticking of the screen residue due to the swirling flow. be able to.
However, since the descending flow rate due to the swirling flow is reduced and the sieving ability is reduced, the amount of sand input is limited.

かくして、本実施例の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽１と、該固液分離槽１の下に設置される沈降槽２とを備えた砂分離洗浄装置において、前記固液分離槽１が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁３と、該筒壁３の底部に配設された逆さ裁頭円錐状の篩からなる底壁４と、該底壁４の中心付近の水をポンプ８により外部に排出する排水ダクト５とを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁４の篩により砂と砂利とを粒径分離し、これにより、底壁４の中心付近に比重差の大きいごみと砂利とを集め、比重の大きい砂利は底壁４中心から沈降槽２に落下させて砂と共に回収する一方、比重の小さいごみを効率よく選択的に排水ダクト５により水と共に排出することができる。
すなわち、従来では、砂とごみ、砂利が混在した状態で比重差分離をしていることから、砂の流出を抑えるために、排水ダクト５の吸込流速を大きくすることができなかったが、本実施例では、比重が大きく異なる砂利とごみを比重差分離するため、従来に比べて吸込流速を大きくすることが可能となり、ごみの除去効率を高めることができる。
また、排水ダクト５の強い吸込流で沈降槽２内の水を吸い込むことにより、底壁４の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
そして、ポンプ８を用いた排水ダクト５の強い吸込流で沈降槽内の水を吸い込むことにより、底壁の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
さらに、排水ダクト５をポンプ８で駆動することにより、多量のし渣が投入されても排水ダクト５が閉塞しにくく、万が一排水ダクト５が閉塞した場合でも、ポンプ８の真空度（差圧）や電動逆止弁の開度計等で容易に制御することができ、また、配置を選ぶことなく、分離したし渣をし渣系設備や汚水沈砂池等に容易に圧送することができる。
また、投入される汚砂混合水の沈砂濃度、し渣濃度はその都度変わるので、ポンプのない無動力式の排水ダクト５ではその閉塞有無等の日常の点検頻度が多くなるが、ポンプ駆動の排水ダクト５では、電気的な制御が可能となり日常点検が不要で信頼性が向上する。 Thus, the sand separation and washing apparatus of the present embodiment is a sand separation and washing apparatus provided with a solid / liquid separation tank 1 into which dirty sand mixed water is introduced and a sedimentation tank 2 installed under the solid / liquid separation tank 1. The solid-liquid separation tank 1 is disposed at a cylindrical cylindrical wall 3 that generates a swirling flow that descends along the peripheral wall by flowing sewage mixed water in a tangential direction, and at the bottom of the cylindrical wall 3. And a drain wall 5 for discharging the water near the center of the bottom wall 4 to the outside by a pump 8 so that the sand and sand can be separated by centrifugal force due to the swirling flow. Disperse the waste and separate the specific gravity difference, and separate the particle size of sand and gravel by the sieve of the bottom wall 4, thereby collecting dust and gravel with a large specific gravity near the center of the bottom wall 4. Large gravel falls into the sedimentation tank 2 from the center of the bottom wall 4 and is collected together with sand, while the specific gravity is small It can be discharged together with the water by selectively draining duct 5 efficiently.
That is, conventionally, since the specific gravity difference separation is performed in a state where sand, waste, and gravel are mixed, the suction flow velocity of the drainage duct 5 cannot be increased in order to suppress the outflow of sand. In the embodiment, gravel and waste having different specific gravities are separated by specific gravity difference, so that the suction flow rate can be increased as compared with the conventional case, and the removal efficiency of dust can be increased.
Moreover, by sucking the water in the sedimentation tank 2 with a strong suction flow of the drainage duct 5, the flow rate of the sieve wall passing through the bottom wall 4 can be increased, thereby enhancing the sieving effect.
And by sucking the water in a sedimentation tank with the strong suction flow of the drainage duct 5 using the pump 8, the sieve passage flow rate of a bottom wall can be increased and, thereby, the sieving effect can be improved.
Further, by driving the drainage duct 5 with the pump 8, the drainage duct 5 is not easily blocked even if a large amount of residue is introduced, and even if the drainage duct 5 is blocked, the degree of vacuum (differential pressure) of the pump 8 It can be easily controlled with an opening check of an electric check valve or the like, and can be easily pumped to a sewer system or a sewage settling basin without selecting an arrangement.
In addition, since the sediment concentration and sediment concentration of the sewage-mixed water that is input changes each time, the non-powered drainage duct 5 without a pump increases the frequency of daily inspections such as the presence or absence of clogging. The drainage duct 5 can be electrically controlled, so that daily inspection is unnecessary and reliability is improved.

この場合、排水ダクト５に逆洗ポンプ２１を接続することにより、万が一排水ダクト５が閉塞した場合でも、排水ダクト５内に水を送って逆洗することができる。   In this case, by connecting the backwash pump 21 to the drainage duct 5, even if the drainage duct 5 is blocked, water can be sent into the drainage duct 5 for backwashing.

また、前記底壁４を上下動可能に弾支することにより、汚砂混合水投入時に、砂利やごみの衝突、ごみの堆積や旋回流により常に変動する水圧等により、底壁４の篩が振動（揺動）し、篩面で捕捉された砂利には常に上下方向の慣性力が働くことになり、篩目への砂利の挟まりを防止することができる。
また、運転完了後、ドレンで水を引き抜きながら、流入管７から水を流入させると、流入水の落下エネルギーをばねのたわみエネルギーに変換することができ、流入を止めると篩は減衰振動を始めることから、この減衰振動による慣性力により逆洗による篩目清掃効果を得ることができる。 Further, by supporting the bottom wall 4 so as to be movable up and down, the sieve of the bottom wall 4 is caused by water pressure that constantly fluctuates due to gravel, dust collision, dust accumulation and swirling flow, etc. The gravitational force that is vibrated (oscillated) and trapped on the sieve surface is always subjected to an inertia force in the vertical direction, so that gravel can be prevented from being caught in the sieve mesh.
In addition, after the operation is completed, when water is introduced from the inflow pipe 7 while draining water with the drain, the falling energy of the inflowing water can be converted into the bending energy of the spring, and when the inflow is stopped, the sieve starts damped vibration. Therefore, the mesh cleaning effect by backwashing can be obtained by the inertial force due to the damped vibration.

また、前記沈降槽２に給水する給水装置を設けることにより、投入砂量が少ない場合に給水し、固液分離槽１の篩面に対して上昇流を発生させ、旋回流によるし渣の張り付きを少なくすることができる。   In addition, by providing a water supply device for supplying water to the settling tank 2, water is supplied when the amount of sand input is small, and an upward flow is generated with respect to the sieve surface of the solid-liquid separation tank 1, and the residue is stuck by swirling flow. Can be reduced.

一方、底壁４の開口部４１に下方から気泡を供給し、底壁４の中心付近に乱流を発生させるエア供給装置１４を設けることにより、旋回流によって縦向きの姿勢で集められる薄板状のごみ２０を、乱流によって排水ダクト５に吸い込まれやすい姿勢にすることができ、これにより、沈降しやすい薄板状のごみ２０を排水ダクト５で吸い込んで排出することができる。
また、エア供給装置１４が、底壁４の裏面に下方から気泡を供給することにより、逆洗時に、底壁４の篩に付着したごみをエアブロー効果により浮上させることができる。 On the other hand, by providing an air supply device 14 that supplies bubbles from below to the opening 41 of the bottom wall 4 and generates turbulent flow near the center of the bottom wall 4, a thin plate shape that is collected in a vertical orientation by a swirling flow The waste 20 can be in a posture that can be easily sucked into the drainage duct 5 by turbulent flow, whereby the thin plate-like dust 20 that tends to settle can be sucked into the drainage duct 5 and discharged.
In addition, the air supply device 14 supplies air bubbles from below to the back surface of the bottom wall 4, so that dust attached to the screen of the bottom wall 4 can be lifted by the air blow effect during backwashing.

そして、ごみに付着させる微細気泡を底壁４の開口部４１付近で発生する微細気泡発生装置２３を設けることにより、水を吸い重くなったタバコのフィルタ２２や、旋回流によって縦向きの姿勢となった薄板状のごみ２０に対し、微細気泡を付着させることによって浮上させるとともに、乱流によって排水ダクト５に吸い込まれやすい縦向き以外の姿勢にし、これにより、水を吸い重くなったタバコのフィルタ２２や、沈降しやすい薄板状のごみ２０を排水ダクト５の上向流で吸い込むようにして、ごみの分離効果を上げることができる。   And by providing the fine bubble generating device 23 that generates fine bubbles to be attached to the dust in the vicinity of the opening 41 of the bottom wall 4, the cigarette filter 22 that has absorbed water and the vertical orientation by the swirl flow The thin plate-like dust 20 is floated by attaching fine bubbles, and has a posture other than the vertical orientation in which it is likely to be sucked into the drainage duct 5 by turbulent flow. 22 and the thin-plate-like garbage 20 that tends to settle can be sucked in the upward flow of the drainage duct 5 to increase the separation effect of the garbage.

図６に、本発明の砂分離洗浄装置の第２実施例を示す。
この砂分離洗浄装置は、汚砂混合水が導入される固液分離槽１と、該固液分離槽１の下に設置される沈降槽２とを備えている。
そして、この砂分離洗浄装置は、前記固液分離槽１が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁３と、該筒壁３の底部に配設された逆さ裁頭円錐状の篩からなる底壁４と、該底壁４の開口部４１と固液分離槽１の上部とを接続しポンプ８により駆動する循環ダクト１１と、該循環ダクト１１の一部に接続されたエジェクタ１２とを備えている。 FIG. 6 shows a second embodiment of the sand separating and cleaning apparatus of the present invention.
This sand separation and cleaning device includes a solid-liquid separation tank 1 into which dirty sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1.
And this sand separation washing | cleaning apparatus has the cylindrical cylinder wall 3 which the said solid-liquid separation tank 1 produces | generates the swirl | vortex flow which descends along a surrounding wall by making waste-sand mixed water flow in in a tangential direction, and this cylinder wall A circulation duct 11 connected to the bottom wall 4 made of an inverted frusto-conical sieve disposed at the bottom of 3, the opening 41 of the bottom wall 4 and the upper part of the solid-liquid separation tank 1 and driven by a pump 8. And an ejector 12 connected to a part of the circulation duct 11.

また、この砂分離洗浄装置は、底壁４の中心付近に沈降槽２に連通する開口部を設けているため、砂利と同じ比重、重量を持つレキ片、ガラス片等は砂利と共に沈降槽２に沈降する。
さらに、高度にごみを除去する手段として、底壁中心の開口部４１を、沈降槽２に連通させることなく、循環ダクト１１に接続することができる。
このとき、篩上や循環ダクト１１にはごみや砂利が溜まっていくので、エジェクタ１２により一定時間毎に固液分離槽１内を再循環させ、篩動作を繰り返し、運転完了後に残ったごみと砂利を分岐管１３から槽外に引き抜くようにする。
また、砂利とごみは処分上分離する必要があるため、後工程に砂利ごみ分離機が必要となるが、砂利ごみ分離機は従来製品の上向流式分級機等を用いることができる。
また、砂利はコンテナ等に回収し、ごみは排水と共に流して、沈砂池に戻すようにする。
そして、この排水ダクト５を備えていない砂分離洗浄装置にも、上記第１実施例の微細気泡発生装置２３を設けることができる。
なお、図６において、第１実施例と同一部材は、同一符号を記すことによりその説明を省略する。 Moreover, since this sand separation washing | cleaning apparatus has provided the opening part connected to the sedimentation tank 2 in the center vicinity of the bottom wall 4, the gravel piece, the glass piece, etc. which have the same specific gravity and weight as gravel are settling tank 2 with gravel. To settle.
Furthermore, as a means for highly removing dust, the opening 41 at the center of the bottom wall can be connected to the circulation duct 11 without communicating with the settling tank 2.
At this time, since dust and gravel accumulate on the sieve and the circulation duct 11, the inside of the solid-liquid separation tank 1 is recirculated by the ejector 12 every predetermined time, and the sieving operation is repeated. The gravel is pulled out of the tank from the branch pipe 13.
Moreover, since it is necessary to separate the gravel and waste for disposal, a gravel waste separator is required in the subsequent process, and a conventional product upward flow classifier or the like can be used as the gravel waste separator.
Gravel is collected in a container, etc., and waste is washed away with waste water and returned to the sand basin.
And the fine bubble generator 23 of the said 1st Example can be provided also in the sand separation washing | cleaning apparatus which is not equipped with this drainage duct 5. FIG.
In FIG. 6, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

かくして、本実施例の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽１と、該固液分離槽１の下に設置される沈降槽２とを備えた砂分離洗浄装置において、前記固液分離槽１が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁３と、該筒壁３の底部に配設された逆さ裁頭円錐状の篩からなる底壁４と、該底壁４の開口部４１と固液分離槽１の上部とを接続しポンプ８により駆動する循環ダクト１１と、該循環ダクト１１の一部に接続されたエジェクタ１２とを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁４の篩により砂と砂利とを粒径分離して、底壁４の中心付近に比重差の大きいごみと砂利を集め、エジェクタ１２及び循環ダクト１１により一定時間毎に溜まったごみと砂利を固液分離槽１内を再循環させ、運転完了後に残ったごみや砂利を槽外に引き抜くことにより、砂利と共に沈降する可能性のあるレキ片やガラス片と区別し、砂のみを回収することができる。
そして、ポンプ８を用いた循環ダクト１１の強い吸込流で沈降槽内の水を吸い込むことにより、底壁の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
さらに、循環ダクト１１をポンプ８で駆動することにより、多量のし渣が投入されても循環ダクト１１が閉塞しにくく、万が一循環ダクト１１が閉塞した場合でも、ポンプ８の真空度（差圧）や電動逆止弁の開度計等で容易に制御することができ、また、配置を選ぶことなく、分離したし渣をし渣系設備や汚水沈砂池等に容易に圧送することができる。
また、投入される汚砂混合水の沈砂濃度、し渣濃度はその都度変わるので、ポンプのない無動力式の循環ダクトではその閉塞有無等の日常の点検頻度が多くなるが、ポンプ駆動の循環ダクト１１では、電気的な制御が可能となり日常点検が不要で信頼性が向上する。 Thus, the sand separation and washing apparatus of the present embodiment is a sand separation and washing apparatus provided with a solid / liquid separation tank 1 into which dirty sand mixed water is introduced and a sedimentation tank 2 installed under the solid / liquid separation tank 1. The solid-liquid separation tank 1 is disposed at a cylindrical cylindrical wall 3 that generates a swirling flow that descends along the peripheral wall by flowing sewage mixed water in a tangential direction, and at the bottom of the cylindrical wall 3. A circulation wall 11 connected to the bottom wall 4 composed of an inverted frusto-conical sieve, an opening 41 of the bottom wall 4 and the upper part of the solid-liquid separation tank 1, and driven by a pump 8, and the circulation duct 11 Since the ejector 12 connected to a part is provided, the sand and the dust are separated by centrifugal force generated by the swirling flow to separate the specific gravity, and the sand and gravel are separated from each other by the sieve of the bottom wall 4. Collecting waste and gravel with a large specific gravity near the center of the bottom wall 4, ejector 12 and circulating duct 11 is used to recycle the dust and gravel collected every certain time in the solid-liquid separation tank 1 and pull out the remaining garbage and gravel after the operation to the outside of the tank. Different from glass pieces, only sand can be collected.
And by sucking the water in a sedimentation tank with the strong suction flow of the circulation duct 11 using the pump 8, the sieve passage flow rate of a bottom wall can be increased and, thereby, the sieving effect can be improved.
Furthermore, by driving the circulation duct 11 with the pump 8, the circulation duct 11 is not easily blocked even when a large amount of residue is introduced, and even if the circulation duct 11 is blocked, the degree of vacuum (differential pressure) of the pump 8 is limited. It can be easily controlled with an opening check of an electric check valve or the like, and can be easily pumped to a sewer system or a sewage settling basin without selecting an arrangement.
In addition, since the sediment concentration and sediment concentration of the sewage-mixed water that is input changes each time, a non-powered circulation duct without a pump increases the frequency of daily inspections such as the presence or absence of clogging. The duct 11 can be electrically controlled, so that daily inspection is unnecessary and reliability is improved.

以上、本発明の砂分離洗浄装置について、複数の実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。   As mentioned above, although the sand separation washing | cleaning apparatus of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, The structure is suitably in the range which does not deviate from the meaning. Can be changed.

本発明の砂分離洗浄装置は、沈砂池等から揚砂された汚砂の臭気を除去するとともに砂中に含まれる夾雑物を高度に除去することから、例えば、汚砂を高度に洗浄することにより産業廃棄物の対象から除外するような場合に好適に適用することができる。   The sand separation and cleaning apparatus of the present invention removes the odor of the sand that has been pumped from a sand basin and the like, and highly removes impurities contained in the sand. Therefore, the present invention can be preferably applied to the case where it is excluded from the object of industrial waste.

本発明の砂分離洗浄装置の第１実施例を示す断面図である。It is sectional drawing which shows 1st Example of the sand separation washing | cleaning apparatus of this invention. 同実施例の砂分離洗浄装置を示す全体図である。It is a general view which shows the sand separation washing | cleaning apparatus of the Example. 同砂分離洗浄装置にエア供給装置を設けた変形実施例を示す断面図である。It is sectional drawing which shows the modification which provided the air supply apparatus in the sand separation washing | cleaning apparatus. エア供給装置に逆洗ノズルを設けた変形実施例を示す断面図である。It is sectional drawing which shows the modification which provided the backwashing nozzle in the air supply apparatus. 旋回流と上向流による薄板状のごみの動きを示す説明図である。It is explanatory drawing which shows the motion of the thin-plate-like refuse by a swirl flow and an upward flow. 本発明の砂分離洗浄装置の第２実施例を示す断面図である。It is sectional drawing which shows 2nd Example of the sand separation washing | cleaning apparatus of this invention. 砂分離洗浄装置に微細気泡発生装置を設けた変形実施例を示す断面図である。It is sectional drawing which shows the modification which provided the fine bubble generator in the sand separation washing | cleaning apparatus.

符号の説明Explanation of symbols

１ 固液分離槽
２ 沈降槽
３ 筒壁
４ 底壁
４１ 開口部
５ 排水ダクト
６ 分離ホッパ
６１ 越流トラフ
７ 流入管
８ ポンプ
９ スクリューコンベア
１０ 逆洗ノズル（給水装置）
１１ 循環ダクト
１２ エジェクタ
１３ 分岐管
１４ エア供給装置
１５ ブロア
１６ 配管
１７ 散気ノズル
１８ 逆洗管
１９ 逆洗ノズル
２０ 薄板状のごみ
２１ 逆洗ポンプ
２２ タバコフィルタ
２３ 微細気泡発生装置 DESCRIPTION OF SYMBOLS 1 Solid-liquid separation tank 2 Sedimentation tank 3 Cylinder wall 4 Bottom wall 41 Opening part 5 Drain duct 6 Separation hopper 61 Overflow trough 7 Inflow pipe 8 Pump 9 Screw conveyor 10 Backwash nozzle (water supply device)
DESCRIPTION OF SYMBOLS 11 Circulation duct 12 Ejector 13 Branch pipe 14 Air supply apparatus 15 Blower 16 Piping 17 Air diffuser nozzle 18 Backwash pipe 19 Backwash nozzle 20 Thin plate-shaped garbage 21 Backwash pump 22 Cigarette filter 23 Fine bubble generator

Claims (8)

汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の中心付近の水をポンプにより外部に排出する排水ダクトとを備えたことを特徴とする砂分離洗浄装置。   In a sand separation and washing apparatus comprising a solid / liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid / liquid separation tank, the solid / liquid separation tank is mixed with sewage sand in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing water, a bottom wall formed of an inverted frustoconical sieve disposed at the bottom of the tube wall, and A sand separation and cleaning device comprising a drainage duct for discharging water near the center to the outside by a pump. 排水ダクトに逆洗ポンプを接続したことを特徴とする請求項１記載の砂分離洗浄装置。   2. The sand separating and cleaning apparatus according to claim 1, wherein a backwash pump is connected to the drain duct. 底壁の開口部に下方から気泡を供給し、底壁の中心付近に乱流を発生させるエア供給装置を設けたことを特徴とする請求項１又は２記載の砂分離洗浄装置。   The sand separating and cleaning apparatus according to claim 1 or 2, further comprising an air supply device for supplying air bubbles from below to the opening of the bottom wall and generating a turbulent flow near the center of the bottom wall. エア供給装置が、底壁の裏面に下方から気泡を供給することを特徴とする請求項３記載の砂分離洗浄装置。   The sand separating and cleaning device according to claim 3, wherein the air supply device supplies air bubbles to the back surface of the bottom wall from below. 汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の開口部と固液分離槽の上部とを接続しポンプにより循環する循環ダクトと、該循環ダクトの一部に接続されたエジェクタとを備えたことを特徴とする砂分離洗浄装置。   In a sand separation and washing apparatus comprising a solid / liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid / liquid separation tank, the solid / liquid separation tank is mixed with sewage in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing water, a bottom wall formed of an inverted frustoconical sieve disposed at the bottom of the tube wall, and A sand separation and cleaning apparatus comprising: a circulation duct that connects an opening and an upper part of a solid-liquid separation tank and circulates by a pump; and an ejector connected to a part of the circulation duct. 前記底壁を上下動可能に弾支したことを特徴とする請求項１、２、３、４又は５記載の砂分離洗浄装置。   The sand separating and cleaning apparatus according to claim 1, 2, 3, 4, or 5, wherein the bottom wall is elastically supported so as to be movable up and down. 前記沈降槽に給水する給水装置を設けたことを特徴とする請求項１、２、３、４、５又は６記載の砂分離洗浄装置。   The sand separating and cleaning apparatus according to claim 1, further comprising a water supply device for supplying water to the settling tank. ごみに付着させる微細気泡を底壁の開口部付近で発生する微細気泡発生装置を設けたことを特徴とする請求項１、２、３、４、５、６又は７記載の砂分離洗浄装置。   8. The sand separation and cleaning apparatus according to claim 1, further comprising a fine bubble generating device for generating fine bubbles to be attached to the garbage in the vicinity of the opening of the bottom wall.
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CN107252729A (en) * 2017-08-16 2017-10-17 南通振强机械制造有限公司 One kind circulation sand-washing device
CN107321490A (en) * 2017-08-16 2017-11-07 南通振强机械制造有限公司 A kind of washed-out sand separator
CN107413512A (en) * 2017-08-16 2017-12-01 南通振强机械制造有限公司 A kind of high intensity sand-washing device
CN107442265A (en) * 2017-08-16 2017-12-08 南通普瑞特机械有限公司 A kind of sandblasting separation cleaning device
CN107442263A (en) * 2017-08-16 2017-12-08 南通振强机械制造有限公司 A kind of washed-out sand sand sifter
GB2572332A (en) * 2018-03-26 2019-10-02 Cde Global Ltd Method and apparatus for grading and washing sand
GB2572332B (en) * 2018-03-26 2021-06-16 Cde Global Ltd Apparatus for grading and washing sand
US11364507B2 (en) 2018-03-26 2022-06-21 Cde Global Limited Method and apparatus for grading and washing sand

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