JP4401251B2 - General waste incineration wastewater treatment method - Google Patents

General waste incineration wastewater treatment method Download PDF

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JP4401251B2
JP4401251B2 JP2004190203A JP2004190203A JP4401251B2 JP 4401251 B2 JP4401251 B2 JP 4401251B2 JP 2004190203 A JP2004190203 A JP 2004190203A JP 2004190203 A JP2004190203 A JP 2004190203A JP 4401251 B2 JP4401251 B2 JP 4401251B2
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知彦 平尾
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Takuma KK
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Description

本発明は、一般ごみ焼却場排水の処理方法に関する。   The present invention relates to a general waste incineration plant wastewater treatment method.

一般に、ごみ焼却プラントでは、環境への配慮から、プラント内で発生した排水は全て排水処理設備で排水処理した後に放流するか、あるいは、燃焼ガス冷却用水等として再利用してプラント外に汚水や処理水を全く放流しない再循環クローズドシステムが導入されている。   In general, in a waste incineration plant, due to environmental considerations, all wastewater generated in the plant is discharged after being treated by wastewater treatment facilities, or reused as combustion gas cooling water, etc. A recirculation closed system has been introduced that does not discharge any treated water.

そのようなごみ焼却プラントの排水処理設備では、通常、排水を、排水中の重金属を除去するための液体キレート剤での処理、浮遊固形分等をフロック化するための凝集剤での処理、およびさらにフロックを大きくするための高分子助剤のような凝集助剤での処理に供することによって、排水中の浮遊物質のフロック化または重金属イオンの不溶化を行っている。通常、上記のキレート剤、凝集剤、凝集助剤での処理は、それぞれ別々の槽において行われ、凝集槽として計３槽を必要とする。   In such waste incineration plant wastewater treatment facilities, wastewater is usually treated with a liquid chelating agent to remove heavy metals in the wastewater, with a flocculant to flocate suspended solids, etc., and further By subjecting it to a treatment with a coagulant aid such as a polymer aid for increasing floc, the floating substance in the wastewater is flocked or heavy metal ions are insolubilized. Usually, the treatment with the chelating agent, the flocculant, and the coagulant aid is performed in separate tanks, and a total of three tanks are required as the coagulation tank.

また、上記３槽を通過した後の処理水は、さらに沈殿槽（または沈殿池）に送られ、そこで凝集物が自然沈降によって沈降される。その上澄み排水はさらに砂ろ過に供された後に、再利用（場合によっては放流）される。一方、沈降物は、脱水機にかけられ、固形分は再度ごみピットへ戻されて燃焼され、脱水ろ液は再度排水処理の原水へ戻されるというようなことが行われている。   Moreover, the treated water after passing through the three tanks is further sent to a settling tank (or a settling basin), where the aggregates settle by natural sedimentation. The supernatant wastewater is further subjected to sand filtration and then reused (or discharged in some cases). On the other hand, the sediment is subjected to a dehydrator, the solid content is again returned to the garbage pit and burned, and the dehydrated filtrate is returned to the raw water for wastewater treatment again.

このように、一般的なごみ焼却プラントでは、凝集槽として３つの槽ならびに沈殿槽および砂ろ過槽が必要であり、また、これらの機器のための敷地面積を必要とする。また、自然沈降を利用するため、凝集物のフロック化を促進するための凝集助剤が必要である。   Thus, in a general waste incineration plant, three tanks as a coagulation tank, a settling tank, and a sand filtration tank are required, and a site area for these devices is required. Moreover, in order to utilize natural sedimentation, an agglomeration aid for promoting flocification of the agglomerates is necessary.

しかしながら、機器点数、敷地面積、および凝集のために添加する薬剤等は、少ない方が、コスト、管理運営、時間等の面では有利であろう。   However, it would be advantageous in terms of cost, management operation, time, and the like if the number of equipment, site area, and chemicals added for aggregation are small.

このような問題に対処する試みとして、設備全体を小型化した焼却プラントの排水処理設備が開示されている（特許文献１）。図２に示すように、特許文献１の排水処理設備は、凝集剤が添加された無機系排水をろ過膜によりろ過して汚濁固形物を分離する第１ろ過装置１２１と、活性汚泥に接触されて汚泥固形物が吸着された第１ろ過装置１２１からの排水および有機系排水をろ過膜によりろ過して汚泥固形物を分離する第２ろ過装置１２２とを具備している。   As an attempt to deal with such a problem, a wastewater treatment facility of an incineration plant in which the entire facility is miniaturized is disclosed (Patent Document 1). As shown in FIG. 2, the wastewater treatment facility of Patent Document 1 is contacted with activated sludge and a first filtration device 121 that filters inorganic solid wastewater to which a flocculant is added through a filtration membrane to separate contaminated solids. And a second filtration device 122 for separating the sludge solid matter by filtering the wastewater from the first filtration device 121 on which the sludge solid matter is adsorbed and the organic wastewater through a filtration membrane.

この従来技術の排水処理設備では、無機系排水を第１原水槽１０１に供給し、次いで薬品混合槽１０２に供給して、凝集剤を添加して懸濁固形物を凝集させる。次いで、この排水を第１ろ過装置１２１に導入して、凝集剤が添加された無機系排水をろ過膜１２３によりろ過して汚濁固形物を分離する。ろ過膜１２３を透過した排水を中和槽１０４に供給し、そこで添加される薬品により中和させた後、第２原水槽１０５に排出する（図中のＢで示す）。第１ろ過装置１２１で濃縮された汚泥は、第１脱水機１０６に送られて脱水された後、廃棄され、排水Ｃは、第１原水槽１０１に戻される。   In this prior art wastewater treatment facility, inorganic wastewater is supplied to the first raw water tank 101 and then supplied to the chemical mixing tank 102, and a flocculant is added to agglomerate suspended solids. Next, the waste water is introduced into the first filtration device 121, and the inorganic waste water to which the flocculant is added is filtered through the filter membrane 123 to separate the solid contaminants. The waste water that has passed through the filtration membrane 123 is supplied to the neutralization tank 104, neutralized by the chemicals added there, and then discharged to the second raw water tank 105 (indicated by B in the figure). The sludge concentrated in the first filtration device 121 is sent to the first dehydrator 106 and dehydrated, and then discarded, and the drainage C is returned to the first raw water tank 101.

第２原水槽１０５には、有機系排水が供給されており、これらの排水は接触酸化槽１０７に導入され、活性汚泥により汚濁固形物質を吸着させて水中濃度を減少させた後、第２ろ過装置１２２に送られて、そこでろ過膜１２４により汚濁固形物が分離される。ろ過膜１２４を透過した排水は、放流槽１１２に導入され、排水放流される。第２ろ過装置１２２で濃縮された汚泥は、第２脱水機１１３に送られて脱水された後、廃棄され、排水Ｃは、第１原水槽１０１に戻される。   Organic wastewater is supplied to the second raw water tank 105. These wastewater is introduced into the contact oxidation tank 107, adsorbed solid contaminants with activated sludge to reduce the concentration in water, and then the second filtration. It is sent to the apparatus 122 where the contaminated solids are separated by the filter membrane 124. The waste water that has passed through the filtration membrane 124 is introduced into the discharge tank 112 and discharged. The sludge concentrated in the second filtration device 122 is sent to the second dehydrator 113 and dehydrated, then discarded, and the drainage C is returned to the first raw water tank 101.

この特許文献１の排水処理設備では、汚泥固形物を除去可能なろ過膜を備えたろ過装置を使用するので、同程度の能力を有する従来の沈殿槽に比べて、大幅に小型化を図ることができ、また、細かい汚泥固形物を除去可能なろ過膜の選定をすることにより、従来必要であった砂ろ過槽および滅菌器を不要にすることができ、設備を簡略化して全体をコンパクトに構成することができる、と記載されている。   In the wastewater treatment facility of Patent Document 1, a filtration device equipped with a filtration membrane capable of removing sludge solids is used, so that the size can be greatly reduced as compared with a conventional sedimentation tank having the same ability. In addition, by selecting a filtration membrane that can remove fine sludge solids, the sand filtration tank and sterilizer that were required in the past can be eliminated, simplifying the equipment and making the whole compact. It can be configured.

しかしながら、特許文献１の排水処理設備では、排水処理フローの中で、無機系排水の処理と有機系排水の処理とを別々に行っており、そのために処理工程が多段になっていること、およびそのための機器（例えば、中和槽１０４、接触酸化槽１０７、第２ろ過装置１２２など）を必要とする点で、未だ処理工程および機器点数の多さは否めない。
特開平０８−１０８１７８号公報 However, in the wastewater treatment facility of Patent Document 1, the treatment of inorganic wastewater and the treatment of organic wastewater are separately performed in the wastewater treatment flow, and the treatment process is therefore multistage, and In view of the need for such equipment (for example, the neutralization tank 104, the contact oxidation tank 107, the second filtration device 122, etc.), there are still many processing steps and a large number of equipment.
Japanese Patent Laid-Open No. 08-108178

そこで、本発明は、一般ごみ焼却場の無機系・有機系排水の処理方法において、さらに設備をコンパクトにし、運転管理を容易にすることを目的とする。   Therefore, an object of the present invention is to further reduce the size of equipment and facilitate operation management in an inorganic / organic wastewater treatment method for a general waste incineration plant.

本発明は、１つの局面において、ごみ焼却プラントにおいて発生する排水を処理するための設備を提供する。この排水処理設備は、排水と、凝集剤および重金属キレート剤とを一緒に混合して上記排水中の浮遊固形分および重金属イオンのフロック化または不溶化を行うための１槽の凝集槽と、上記凝集槽からの上記排水を、精密ろ過膜によりろ過して固液分離するための精密ろ過膜処理槽とを備えている。   In one aspect, the present invention provides equipment for treating wastewater generated in a waste incineration plant. This waste water treatment facility comprises a single agglomeration tank for flocking or insolubilizing floating solids and heavy metal ions in the waste water by mixing waste water together with a flocculant and a heavy metal chelating agent; A microfiltration membrane treatment tank is provided for filtering the waste water from the tank through a microfiltration membrane for solid-liquid separation.

このように、本発明の排水処理設備は、凝集槽として１槽のみを必要とするため、機器点数が少なく済み、さらに、精密ろ過膜で有機系の微小粒子の分離が可能であるため、有機系排水処理（または生物処理）のための処理槽を別個に設ける必要がなく、したがって、設備自体がコンパクトになり、さらに排水処理の時間も短縮されるという利点を有する。   Thus, since the wastewater treatment facility of the present invention requires only one tank as a coagulation tank, the number of equipment can be reduced, and organic microparticles can be separated with a microfiltration membrane. There is no need to provide a separate treatment tank for system wastewater treatment (or biological treatment), and therefore, the facility itself has the advantage of being compact and further reducing the time for wastewater treatment.

本発明の排水処理設備の好ましい実施形態では、上記凝集槽２において、上記排水にさらに炭酸ナトリウムを一緒に混合する。それにより、精密ろ過膜でのスケール生成による閉塞の原因となるＣａ分をＣａＣＯ3として予め粒子化し、除去することが可能となる。 In a preferred embodiment of the wastewater treatment facility of the present invention, sodium carbonate is further mixed together with the wastewater in the aggregation tank 2. As a result, the Ca component that causes clogging due to scale generation in the microfiltration membrane can be pre-particled as CaCO 3 and removed.

本発明は、別の局面において、ごみ焼却プラントにおいて発生する排水を処理する方法を提供する。この排水処理方法は、１槽の凝集槽において、上記排水と、凝集剤および重金属キレート剤とを一緒に混合して、上記排水中の浮遊固形分および重金属イオンをフロック化または不溶化する工程と、上記凝集槽からの上記排水を、精密ろ過膜によりろ過して固液分離する工程とを含むことを特徴とする。   In another aspect, the present invention provides a method for treating wastewater generated in a waste incineration plant. This wastewater treatment method comprises a step of flocking or insolubilizing suspended solids and heavy metal ions in the wastewater by mixing the wastewater together with the flocculant and the heavy metal chelating agent in a single agglomeration tank, A step of filtering the waste water from the coagulation tank through a microfiltration membrane and separating it into solid and liquid.

本発明の排水処理方法は、１槽の凝集槽において浮遊固形分のフロック化または重金属の不溶化を完了することができ、さらに精密ろ過膜による浮遊固形分の分離を行うため、有機系排水処理（または生物処理）のための処理槽を別個に設ける必要はないため、排水処理が容易であり、それに要する時間も短縮されるという利点がある。   The wastewater treatment method of the present invention can complete the flocculation of floating solids or insolubilization of heavy metals in a single agglomeration tank, and further separates the suspended solids using a microfiltration membrane. In addition, since it is not necessary to provide a separate treatment tank for biological treatment), there is an advantage that waste water treatment is easy and the time required for the treatment is shortened.

本発明の排水処理方法の好ましい実施形態では、上記フロック化または不溶化する工程において、さらに炭酸ナトリウムを一緒に混合する。それにより、精密ろ過膜の閉塞の原因となるＣａ分をＣａＣＯ3として予め粒子化し除去することが可能となる。 In a preferred embodiment of the wastewater treatment method of the present invention, sodium carbonate is further mixed together in the flocking or insolubilizing step. As a result, it is possible to preliminarily remove the Ca component that causes the clogging of the microfiltration membrane as CaCO 3 .

本発明は、ろ過装置として精密ろ過膜ろ過装置を使用することによって、無機系と有機系の排水処理を区別する必要が無いこと（または生物処理等の処理を別途行う必要はないこと）および凝集助剤を使用する必要がないこと、ならびにキレート剤と凝集剤での処理を同一槽内で行い得ること等を、本発明者が見出したことに基づいている。   By using a microfiltration membrane filtration device as a filtration device, the present invention eliminates the need to distinguish between inorganic and organic wastewater treatment (or does not require separate treatment such as biological treatment) and agglomeration It is based on what this inventor discovered that it is not necessary to use an auxiliary agent, and that the process with a chelating agent and a flocculant can be performed in the same tank.

上記のように、本発明によれば、排水設備のコンパクト化、動力費の低減、およびランニングコストの低減等が図れる。   As described above, according to the present invention, the drainage facility can be made compact, the power cost can be reduced, and the running cost can be reduced.

以下、図面を参照して、本発明の実施形態を説明するが、これは本発明の範囲を制限するものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings, but this does not limit the scope of the present invention.

図１は、本発明の一実施形態に係る、ごみ焼却プラントにおいて発生する排水を処理するための排水処理設備１１の全体構成を示す模式図である。図１に示すように、本実施形態の排水処理設備１１は、凝集槽１２、および精密ろ過膜（以下、ＭＦ（Ｍｉｃｒｏ Ｆｉｌｔｒａｔｉｏｎ）膜と略す）ろ過装置１４を備えるＭＦ膜処理槽１３を主要な構成要素とする。典型的には、さらに脱水機１５、ポンプ１６、１７、およびブロア１８を備えている。   FIG. 1 is a schematic diagram illustrating an overall configuration of a wastewater treatment facility 11 for treating wastewater generated in a waste incineration plant according to an embodiment of the present invention. As shown in FIG. 1, the waste water treatment facility 11 of the present embodiment includes a MF membrane treatment tank 13 including a coagulation tank 12 and a microfiltration membrane (hereinafter abbreviated as MF (Micro Filtration) membrane) filtration device 14 as main components. It is a component. Typically, a dehydrator 15, pumps 16 and 17, and a blower 18 are further provided.

まず、ごみ焼却プラント（不図示）において発生した排水は、凝集槽１２に送られ、そこで排水中の重金属類の不溶化および浮遊固形分（以下、ＳＳ（Ｓｕｓｐｅｎｄｅｄ Ｓｏｌｉｄ）と略すことがある）のフロック化等が行われる。ここで、上記排水は、無機系排水であるか、有機系排水であるか、またはその両方かであるかを問わない。   First, wastewater generated in a waste incineration plant (not shown) is sent to a coagulation tank 12, where insoluble heavy metals in the wastewater and flocs of suspended solids (hereinafter abbreviated as SS (Suspended Solid)) are used. Etc. are performed. Here, it does not matter whether the waste water is inorganic waste water, organic waste water, or both.

凝集槽１２では、排水は、常温で塩化第二鉄または硫酸バンドなどのような凝集剤と適切なｐＨ条件下（通常、ｐＨ６−８、好ましくは、ｐＨ７）で混合され、排水中の重金属類およびＳＳが水酸化物として不溶化またはフロック化される。上記凝集槽１２において、さらに、上記排水中の重金属をキレート化合物にして不溶化するための液体キレート剤を混合する。さらに、上記排水中のＣａ分をＣａＣＯ3として粒子化するために、炭酸ナトリウムを凝集槽１２に混合してもよい。これにより、ＭＦ膜でのスケール生成を予防し得る。 In the flocculation tank 12, the wastewater is mixed with a flocculant such as ferric chloride or a sulfuric acid band at an ordinary temperature under an appropriate pH condition (usually pH 6-8, preferably pH 7), and heavy metals in the wastewater. And SS are insolubilized or flocked as hydroxides. In the agglomeration tank 12, a liquid chelating agent for insolubilizing the heavy metal in the waste water into a chelate compound is further mixed. Further, sodium carbonate may be mixed into the agglomeration tank 12 in order to granulate the Ca content in the waste water as CaCO 3 . Thereby, scale generation in the MF membrane can be prevented.

このように、本発明の排水処理設備１１では、１つの凝集槽において、凝集剤、液体キレート剤、およびＣａを粒子化するための炭酸ナトリウムでの排水処理を同時に行い得るため、設備のコンパクト化という面で非常に有利である。   As described above, in the wastewater treatment facility 11 of the present invention, the wastewater treatment with the sodium carbonate for granulating the flocculant, the liquid chelating agent, and Ca can be simultaneously performed in one coagulation tank. This is very advantageous.

なお、本発明の排水処理設備１１の凝集槽１２で使用する凝集剤としては、塩化第二鉄、硫酸バンド等が使用され得る。Ｃａ粒子化剤としては、上記の炭酸ナトリウムのほかに、炭酸カリウム等が使用され得る。   In addition, as a coagulant | flocculant used with the coagulation tank 12 of the waste water treatment facility 11 of this invention, a ferric chloride, a sulfuric acid band, etc. may be used. As the Ca particle forming agent, potassium carbonate or the like can be used in addition to the above sodium carbonate.

次いで、凝集槽１２で処理された排水は、自然流下によりＭＦ膜ろ過装置１４を備えたＭＦ膜処理槽１３に送られ、そこで、不溶化またはフロック化された固形物の除去が行われる。ＭＦ膜は、約１０μｍ〜０．１μｍの大きさの固形物（例えば、懸濁物、コロイド、凝集物、微粒子、細菌など）を除去するのに適したろ過膜である。本発明の排水処理設備１１では、ＭＦ膜ろ過装置１４として、代表的には、浸せき型のＭＦ膜を用いたろ過装置を使用するが、これに限定されない。ＭＦ膜を用いたろ過装置は、当業者に周知の業者から市販品として入手可能である。一般に、ポリフッ化ビニリデン（ＰＶＤＦ）、ポリエチレン多孔質フィルム等の素材でできたＭＦ膜を使用したものが容易に入手可能であり、当業者は用途に応じて適宜最適なものを選択し得る。なお、ＭＦ膜は中空子膜であり、常に表面を洗浄する必要があるため、ＭＦ膜処理槽１３では、常にＭＦ膜処理装置１４の下部からブロア１８で空気を送り、泡によって膜表面に付着する浮遊物を除去する。   Next, the wastewater treated in the coagulation tank 12 is sent to the MF membrane treatment tank 13 provided with the MF membrane filtration device 14 by natural flow, where the insoluble or flocked solids are removed. The MF membrane is a filtration membrane suitable for removing solids (eg, suspensions, colloids, aggregates, microparticles, bacteria, etc.) having a size of about 10 μm to 0.1 μm. In the waste water treatment facility 11 of the present invention, as the MF membrane filtration device 14, a filtration device using an immersion type MF membrane is typically used, but is not limited thereto. A filtration apparatus using an MF membrane is commercially available from a vendor well known to those skilled in the art. In general, those using an MF membrane made of a material such as polyvinylidene fluoride (PVDF) or a polyethylene porous film are readily available, and those skilled in the art can select an optimal one according to the application. Since the MF membrane is a hollow membrane and it is necessary to always clean the surface, in the MF membrane treatment tank 13, air is always sent from the lower part of the MF membrane treatment device 14 by the blower 18 and adhered to the membrane surface by bubbles. Remove floating substances.

ＭＦ膜ろ過装置１４を透過した排水は、通常、ポンプ１７によってごみ焼却プラント（不図示）のガス冷却塔１９へ送られ、そこで、ガスを冷却するために使用される。一方、ＭＦ膜ろ過装置１４を透過し得なかった固形物を含む濃縮排水は、ポンプ１６により脱水機１５に送られて脱水され、そこで汚泥と脱水ろ液Ａとに分離される。脱水汚泥は、通常、ごみ焼却プラントのごみピット２０へ戻され、再度燃焼される（場合によっては、単独で場外搬出することもある）。一方、脱水ろ液Ａは排水処理フローの原水に戻され、再度排水処理に供される。   The waste water that has permeated through the MF membrane filtration device 14 is usually sent by a pump 17 to a gas cooling tower 19 of a waste incineration plant (not shown), where it is used to cool the gas. On the other hand, the concentrated wastewater containing solids that could not pass through the MF membrane filtration device 14 is sent to the dehydrator 15 by the pump 16 and dehydrated, where it is separated into sludge and dehydrated filtrate A. The dewatered sludge is usually returned to the waste pit 20 of the waste incineration plant and burned again (in some cases, it may be carried out of the field alone). On the other hand, the dehydrated filtrate A is returned to the raw water of the wastewater treatment flow and again subjected to wastewater treatment.

本発明の排水処理設備１１では、ＭＦ膜処理槽１３において、典型的には、ＳＳの濃度２０，０００ｐｐｍ程度まで排水を濃縮することが可能であり、従来の沈殿槽（または沈殿池）や砂ろ過槽と代替できる。   In the wastewater treatment facility 11 of the present invention, the wastewater can be concentrated in the MF membrane treatment tank 13 typically to an SS concentration of about 20,000 ppm, and a conventional sedimentation tank (or sedimentation basin) or sand can be obtained. Can be replaced with filtration tank.

従来、凝集剤で排水を処理するときは、混合することを目的に早い回転数で攪拌し（典型的には２００〜４００ｒｐｍ）、凝集助剤で排水を処理する場合には、フロックを大きくすることを目的に凝集剤で処理するときよりも遅い回転数（典型的には、２００ｒｐｍ以下）でゆっくりと攪拌する必要があった。そのため、凝集剤での処理のための槽と凝集助剤での処理のための槽とを別々に設ける必要があった。しかしながら、本発明の排水処理設備１１で使用するＭＦ膜は、約１０μｍ〜０．１μｍの大きさの微小な粒子を捕捉・分離することができるため、凝集剤で排水を処理した後、従来のように凝集助剤を用いてさらにフロックを大きくする工程（またはそのための槽）を設ける必要がない。また、ＭＦ膜処理槽１３において（ＭＦ膜により）、有機物等の除去も行い得るため、有機系排水の処理（または生物処理）のための工程または処理槽を別途設ける必要がないという利点が得られる。   Conventionally, when wastewater is treated with a flocculant, stirring is performed at a high rotational speed for the purpose of mixing (typically 200 to 400 rpm), and when wastewater is treated with a flocculant aid, the floc is increased. For this purpose, it was necessary to stir slowly at a lower rotational speed (typically 200 rpm or less) than when treating with a flocculant. Therefore, it is necessary to separately provide a tank for the treatment with the flocculant and a tank for the treatment with the flocculant aid. However, since the MF membrane used in the wastewater treatment facility 11 of the present invention can capture and separate fine particles having a size of about 10 μm to 0.1 μm, after treating wastewater with a flocculant, Thus, there is no need to provide a step (or a tank therefor) for further increasing the floc using the coagulant aid. Further, in the MF membrane treatment tank 13 (by the MF membrane), organic substances and the like can be removed, so that there is an advantage that it is not necessary to separately provide a process or treatment tank for treating organic wastewater (or biological treatment). It is done.

さらに、本発明の排水処理設備では、キレート剤での処理と凝集剤での処理とを１つの槽内で一緒に行う。通常、キレート剤メーカーの指示書によれば、キレート剤での処理を単独で行うことが推奨されているが、本発明者の実験により、凝集剤と同一槽内でキレート剤を用いても問題がないことが判明している。   Furthermore, in the wastewater treatment facility of the present invention, the treatment with the chelating agent and the treatment with the flocculant are performed together in one tank. Normally, according to the instructions of the chelating agent manufacturer, it is recommended to perform the treatment with the chelating agent alone, but it has been found by the inventor's experiment that the chelating agent can be used in the same tank as the flocculant. It has been found that there is no.

このように、本発明の排水処理設備１１によれば、設備の機器点数を有意に減少させ得、顕著な設備のコンパクト化が可能となり、排水処理手順の簡易化、設備費の削減、管理運営の簡易化等の点で有意な利益が得られる。   As described above, according to the wastewater treatment facility 11 of the present invention, the number of equipment can be significantly reduced, and the equipment can be remarkably compacted. The wastewater treatment procedure is simplified, the equipment cost is reduced, and the management operation is performed. Significant benefits can be obtained in terms of simplification of the process.

以下、実施例を用いて、本発明をさらに具体的に説明するが、この実施例は本発明の範囲を制限するものではない。   Hereinafter, the present invention will be described more specifically with reference to examples. However, the examples do not limit the scope of the present invention.

図１に示すものと同様の本発明の排水処理設備１１において、以下のように排水処理を行った。   In the waste water treatment facility 11 of the present invention similar to that shown in FIG. 1, waste water treatment was performed as follows.

まず、ごみ焼却プラントからの無機系、有機系排水等を含む各種汚水を、一槽の凝集槽１２に投入した。凝集槽１２には、重金属除去用の液体キレート剤を２０〜５０ｐｐｍ、スケール防止剤としての炭酸ナトリウム（ＮａＣＯ3）を１００〜３００ｐｐｍ、凝集剤として塩化第２鉄（ＦｅＣｌ3）を１００ｐｐｍ含まれるように投入し、上記排水と混合させた。 First, various sewage including inorganic and organic waste water from a waste incineration plant was put into one coagulation tank 12. The agglomeration tank 12 contains 20 to 50 ppm of a liquid chelating agent for removing heavy metals, 100 to 300 ppm of sodium carbonate (NaCO 3 ) as a scale inhibitor, and 100 ppm of ferric chloride (FeCl 3 ) as an aggregating agent. And mixed with the waste water.

凝集槽１２において上記の通り粒子化処理を行った排水を、ＭＦ膜処理槽１３に流入させた。ＭＦ膜処理槽１３には、浸せき型のＭＦ膜ろ過装置（三菱レイヨン社製）が設置されており、ここで、固液分離を行った。   The wastewater that had been subjected to the particleization treatment in the aggregation tank 12 as described above was caused to flow into the MF membrane treatment tank 13. In the MF membrane treatment tank 13, an immersion type MF membrane filtration device (manufactured by Mitsubishi Rayon Co., Ltd.) is installed, and solid-liquid separation was performed here.

結果を、以下の表１に示す。

Figure 0004401251
The results are shown in Table 1 below.
Figure 0004401251

上記のように、本発明の排水処理設備１１で処理された処理水中のＳＳは完全に除去されており、ＢＯＤも、処理前に比べて１０分の１未満に減少していることがわかる。また、ＰｂやＣｄのような重金属類の濃度も、処理前の原水に比較して、有意に減少していることがわかる。   As described above, it can be seen that the SS in the treated water treated by the wastewater treatment facility 11 of the present invention is completely removed, and the BOD is also reduced to less than 1/10 compared to before the treatment. Moreover, it turns out that the density | concentration of heavy metals, such as Pb and Cd, has also decreased significantly compared with the raw | natural water before a process.

したがって、本発明の排水処理設備１１は、排水処理において効果的であることが示された。   Therefore, it was shown that the waste water treatment facility 11 of the present invention is effective in waste water treatment.

本発明の排水処理設備は、排水設備のコンパクト化、動力費の低減、およびランニングコストの低減等が図れるため、ごみ焼却プラント等の排水処理設備として有用である。   The wastewater treatment facility of the present invention is useful as a wastewater treatment facility for a waste incineration plant or the like because the drainage facility can be made compact, the power cost can be reduced, and the running cost can be reduced.

本発明の一実施形態に係る、ごみ焼却プラントにおいて発生する排水を処理するための排水処理設備１１の全体構成を示す模式図The schematic diagram which shows the whole structure of the waste water treatment facility 11 for processing the waste_water | drain generated in the waste incineration plant based on one Embodiment of this invention. 従来のごみ焼却施設における排水処理設備の全体構成を示す模式図Schematic diagram showing the overall configuration of wastewater treatment equipment in a conventional waste incineration facility

符号の説明Explanation of symbols

１１ 本発明の排水処理設備
１２ 凝集槽
１３ ＭＦ膜処理槽
１４ ＭＦ膜ろ過装置
１５ 脱水機
１６，１７ ポンプ
１８ ブロア
１９ ガス冷却塔
２０ ごみピット 11 Wastewater treatment facility 12 of the present invention Coagulation tank 13 MF membrane treatment tank 14 MF membrane filtration device 15 Dehydrator 16, 17 Pump 18 Blower 19 Gas cooling tower 20 Garbage pit

Claims (2)

ごみ焼却プラントにおいて発生する排水を処理するための設備であって、
前記排水と、凝集剤、重金属キレート剤および炭酸ナトリウムとを一緒に混合して前記排水中の浮遊固形分および重金属イオンのフロック化または不溶化を行うための凝集槽と、
前記凝集槽からの前記排水を、精密ろ過膜によりろ過して固液分離するための精密ろ過
膜処理槽とを備える、排水処理設備。 A facility for treating wastewater generated in a waste incineration plant,
A coagulation tank for flocking or insolubilizing floating solids and heavy metal ions in the wastewater by mixing the wastewater together with a flocculant, a heavy metal chelating agent and sodium carbonate ;
A wastewater treatment facility comprising a microfiltration membrane treatment tank for filtering the solid waste from the coagulation tank by a microfiltration membrane and separating it into solid and liquid. ごみ焼却プラントにおいて発生する排水を処理する方法であって、
１槽の凝集槽において、前記排水と、凝集剤、重金属キレート剤および炭酸ナトリウムとを一緒に混合して、前記排水中の浮遊固形分および重金属イオンをフロック化または不溶化する工程と、
前記凝集槽からの前記排水を、精密ろ過膜によりろ過して固液分離する工程とを含む、
排水処理方法。 A method for treating wastewater generated in a waste incineration plant,
In one flocculation tank, the waste water and a flocculant, a heavy metal chelating agent, and sodium carbonate are mixed together to flock or insolubilize suspended solids and heavy metal ions in the waste water;
A step of filtering the waste water from the agglomeration tank through a microfiltration membrane and separating it into solid and liquid,
Wastewater treatment method.
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