JP2008259930A - Method for treating organic solvent-containing waste water - Google Patents

Method for treating organic solvent-containing waste water Download PDF

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JP2008259930A
JP2008259930A JP2007102827A JP2007102827A JP2008259930A JP 2008259930 A JP2008259930 A JP 2008259930A JP 2007102827 A JP2007102827 A JP 2007102827A JP 2007102827 A JP2007102827 A JP 2007102827A JP 2008259930 A JP2008259930 A JP 2008259930A
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organic solvent
containing wastewater
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waste water
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Yoshio Nakayama
善雄 中山
Sayoko Yamane
佐代子 山根
Teruhisa Yoshida
輝久 吉田
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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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for treating organic solvent-containing waste water where an organic solvent or the like is made easy to be decomposed by pretreatment, thus a load in water treatment facilities where activated sludge treatment is performed is reduced, satisfactory treated water quality is secured, and further, the amount of the sludge to be generated is reduced. <P>SOLUTION: In the method for treating organic solvent-containing waste water where organic solvent-containing waste water containing a hydrocarbon compound, alcohols or the like is subjected to biological decomposition using activated sludge, the prestage of waste water treatment facilities where activated sludge treatment is performed is provided with an electrolyzer I, and, before activated sludge treatment is performed, organic solvent-containing waste water A is subjected to electrolytic treatment. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、有機溶剤含有廃水の処理方法に関し、特に、有機溶剤等を前処理で易分解化することにより、活性汚泥処理を行う廃水処理施設での負荷を軽減し、処理良好な処理水質を確保するとともに発生汚泥量を低減するようにした有機溶剤含有廃水の処理方法に関するものである。   The present invention relates to a method for treating organic solvent-containing wastewater, and in particular, by easily decomposing an organic solvent or the like by pretreatment, the load at a wastewater treatment facility that performs activated sludge treatment is reduced, and the treated water quality is improved. The present invention relates to a method for treating organic solvent-containing wastewater that is secured and reduces the amount of generated sludge.

炭化水素化合物及びアルコール類といった有機溶剤等を製造工程で利用し、本有機溶剤を含んだ排水を活性汚泥で処理する場合、他の雑廃水と比較し、芳香族系化合物等の難分解成分を含むため、曝気槽の汚泥濃度を高く維持する必要があり、十分な固形物濃度、滞留時間を曝気槽で確保しなければ、処理水中に有機成分が流出し、もしくは、冬季等の固形物の沈降性の悪い時期は、沈殿槽から固形物が流出、もしくは良好な処理水を得られない場合もあった。   When organic solvents such as hydrocarbon compounds and alcohols are used in the manufacturing process, and wastewater containing this organic solvent is treated with activated sludge, compared to other wastewater, difficult-to-decompose components such as aromatic compounds are removed. Therefore, it is necessary to keep the sludge concentration in the aeration tank high.If sufficient solids concentration and residence time are not secured in the aeration tank, organic components will flow into the treated water, or solid substances such as in winter When the sedimentation was poor, solids sometimes flowed out of the sedimentation tank, or good treated water could not be obtained.

一方、有機溶剤含有廃水の電解処理については、これまでに下記に示す技術が提案されている。
特許文献１では、黒鉛を含む黒鉛電極、ガラス質カーボン電極、カーボンワイヤー電極を作用電極とし、酸素を含む気体の存在下において、還元電位又は還元電流で電気分解を行うことにより、有機溶剤等の分解を行うことが提案されているが、カーボン系の電極は、電解時の電気量に比例し、カーボンが溶出し、金属電極と比較すると極めて消耗が激しく、また、陽極より発生した酸化物等によりカーボン自体が自己酸化されることから、実用化が困難であるという問題があった。 On the other hand, the following technologies have been proposed so far for electrolytic treatment of organic solvent-containing wastewater.
In Patent Document 1, a graphite electrode containing graphite, a vitreous carbon electrode, and a carbon wire electrode are used as working electrodes, and in the presence of a gas containing oxygen, electrolysis is performed at a reduction potential or a reduction current, so that an organic solvent, etc. Although it is proposed to perform decomposition, carbon-based electrodes are proportional to the amount of electricity during electrolysis, and carbon elutes, which is extremely exhaustive compared to metal electrodes, and oxides generated from the anode, etc. As a result, the carbon itself is self-oxidized, which makes it difficult to put it into practical use.

特許文献２では、金属電極の使用が提案されているが、ＣＯＤ（化学的酸素要求量）１０００ｐｐｍ以上の有機物を含む廃液と限定されているため、１０００ｐｐｍ未満の廃水については、処理ができないといった問題があり、さらに、第一工程で電解処理、第二工程においては、第一工程からの電解処理水を紫外線反応槽に通液して分解を行うため、装置の大型化及びイニシャルコストが大きすぎ、実用化が困難といった問題があった。   In Patent Document 2, the use of a metal electrode is proposed, but since it is limited to a waste liquid containing an organic substance with a COD (chemical oxygen demand) of 1000 ppm or more, the problem is that waste water with a density of less than 1000 ppm cannot be treated. Furthermore, since the electrolytic treatment is performed in the first step and the electrolytic treatment water from the first step is passed through the ultraviolet reaction tank for decomposition in the second step, the size of the apparatus and the initial cost are too high. There was a problem that it was difficult to put into practical use.

なお、特許文献３は、電解処理により難分解な炭素源を易分解化するが、限定された微生物に資化させる微生物の培養方法であり、用途が限定されている。
特開平１０−２１６７２７号公報 特開２００３−２００１７１号公報 特開平１０−２９０６８７号公報 Patent Document 3 is a method of culturing microorganisms that easily decomposes a hardly-decomposable carbon source by electrolytic treatment, but is limited to microorganisms, and has limited applications.
JP-A-10-216727 JP 2003-200191 A Japanese Patent Laid-Open No. 10-290687

本発明は、上記従来の有機溶剤含有廃水の処理方法が有する問題点に鑑み、有機溶剤等を前処理で易分解化することにより、活性汚泥処理を行う廃水処理施設での負荷を軽減し、処理良好な処理水質を確保するとともに発生汚泥量を低減するようにした有機溶剤含有廃水の処理方法を提供することを目的とする。   In view of the problems of the above-described conventional organic solvent-containing wastewater treatment methods, the present invention reduces the burden on wastewater treatment facilities that perform activated sludge treatment by easily decomposing organic solvents and the like by pretreatment, An object of the present invention is to provide a method for treating organic solvent-containing wastewater that ensures the quality of treated water and reduces the amount of generated sludge.

上記目的を達成するため、本発明の有機溶剤含有廃水の処理方法は、炭化水素化合物又はアルコール類等を含む有機溶剤含有廃水を活性汚泥を用いて生物分解する有機溶剤含有廃水の処理方法において、活性汚泥処理を行う廃水処理施設の前段に電解装置を設け、活性汚泥処理を行う前に有機溶剤含有廃水に電解処理を施すことを特徴とする。   In order to achieve the above object, the method for treating organic solvent-containing wastewater of the present invention is a method for treating organic solvent-containing wastewater that biodegrades organic solvent-containing wastewater containing hydrocarbon compounds or alcohols using activated sludge, An electrolysis apparatus is provided in the front stage of the wastewater treatment facility that performs the activated sludge treatment, and the organic solvent-containing wastewater is subjected to the electrolytic treatment before the activated sludge treatment.

この場合において、電解装置に用いる電極板として金属電極を用いることができる。   In this case, a metal electrode can be used as an electrode plate used in the electrolysis apparatus.

また、チタン基材に白金及びイリジウム又は白金をコーティングした金属電極を用い、電解時の電流密度が０．１〜１００Ａ／ｄｍ２となるように金属電極に電流を供給することができる。 Moreover, using a metal electrode obtained by coating platinum and iridium or platinum on a titanium base material, current can be supplied to the metal electrode so that the current density during electrolysis is 0.1 to 100 A / dm 2 .

また、有機溶剤含有廃水に電解質を添加することができる。   Further, an electrolyte can be added to the organic solvent-containing wastewater.

また、有機溶剤含有廃水に塩化ナトリウム又は塩化カリウムを０．０５〜１０％（Ｗ／Ｖ）の濃度で添加することができる。   Moreover, sodium chloride or potassium chloride can be added to the organic solvent-containing wastewater at a concentration of 0.05 to 10% (W / V).

本発明の有機溶剤含有廃水の処理方法によれば、炭化水素化合物又はアルコール類等を含む有機溶剤含有廃水を活性汚泥を用いて生物分解する有機溶剤含有廃水の処理方法において、活性汚泥処理を行う廃水処理施設の前段に電解装置を設け、活性汚泥処理を行う前に有機溶剤含有廃水に電解処理を施すことから、活性汚泥を用いた廃水処理施設に流入する炭化水素化合物及びアルコール類等の有機溶剤を電解処理により易分解し、廃水処理施設へ流入させることにより、廃水処理施設の負荷を軽減することができ、良好な処理水質を確保するとともに、負荷の低減に伴って発生汚泥量を低減し、廃棄物を削減することができる。   According to the organic solvent-containing wastewater treatment method of the present invention, the activated sludge treatment is performed in the organic solvent-containing wastewater treatment method for biodegrading the organic solvent-containing wastewater containing hydrocarbon compounds or alcohols using activated sludge. Since an electrolysis device is installed in front of the wastewater treatment facility and the organic solvent-containing wastewater is subjected to electrolytic treatment before the activated sludge treatment, organic substances such as hydrocarbon compounds and alcohols flowing into the wastewater treatment facility using activated sludge are used. By easily decomposing the solvent by electrolytic treatment and allowing it to flow into the wastewater treatment facility, the load on the wastewater treatment facility can be reduced, ensuring a good quality of treated water, and reducing the amount of generated sludge as the load is reduced. And waste can be reduced.

この場合、電解装置に用いる電極板として金属電極を用いることにより、電極の長寿命化を図ることができる。   In this case, the life of the electrode can be extended by using a metal electrode as the electrode plate used in the electrolysis apparatus.

また、チタン基材に白金及びイリジウム又は白金をコーティングした金属電極を用い、電解時の電流密度が０．１〜１００Ａ／ｄｍ２となるように金属電極に電流を供給することにより、電極の長寿命化を図りながら有機溶剤を効率的に電解処理することができる。 In addition, by using a metal electrode obtained by coating platinum and iridium or platinum on a titanium base material and supplying a current to the metal electrode so that the current density during electrolysis is 0.1 to 100 A / dm 2 , The organic solvent can be efficiently subjected to electrolytic treatment while extending the life.

また、有機溶剤含有廃水に電解質を添加することにより、有機溶剤を効率的に電解処理することができる。   Moreover, the organic solvent can be efficiently electrolytically treated by adding an electrolyte to the organic solvent-containing wastewater.

また、電解時の陽極近傍では、強酸化状態で被分解対象物質が酸化分解されるが、有機溶剤含有廃水に塩化ナトリウム又は塩化カリウムを０．０５〜１０％（Ｗ／Ｖ）の濃度で添加することにより、電極間で酸化作用の大きい次亜塩素酸が生成され、被分解対象物質はさらなる酸化分解を受ける。   In the vicinity of the anode during electrolysis, the substance to be decomposed is oxidatively decomposed in a strong oxidation state. Sodium chloride or potassium chloride is added to the organic solvent-containing wastewater at a concentration of 0.05 to 10% (W / V). As a result, hypochlorous acid having a large oxidizing action is generated between the electrodes, and the substance to be decomposed undergoes further oxidative decomposition.

以下、本発明の有機溶剤含有廃水の処理方法の実施の形態を、図面に基づいて説明する。   Hereinafter, an embodiment of a method for treating an organic solvent-containing wastewater according to the present invention will be described with reference to the drawings.

図１〜図２に、本発明の有機溶剤含有廃水の処理方法の一実施例を示す。
図１に示すように、有機溶剤含有廃水Ａは、電解装置Ｉで電解処理を施された後、易分解化された状態で、電解処理廃水Ｂとして曝気槽IIに供給される。
曝気槽IIでは、活性汚泥により電解処理廃水Ｂの有機成分を分解除去する。そして、この有機成分が除去された廃水と活性汚泥の混合液Ｃを沈殿槽IIIに流入させ、固液分離を経て、上澄み水が処理水Ｄとして放流される。
一方、固液分離された汚泥の大部分は、返送汚泥Ｅとして曝気槽IIに移送され、再び生物処理に供されるが、一部の汚泥は余剰汚泥Ｆとして、通常はさらに濃縮を行った後、濃縮汚泥の形でバキューム排出したり、濃縮汚泥を脱水して脱水ケーキの状態で搬出する。 1 to 2 show an embodiment of the method for treating organic solvent-containing wastewater of the present invention.
As shown in FIG. 1, the organic solvent-containing waste water A is supplied to the aeration tank II as the electrolytic treatment waste water B in an easily decomposed state after being subjected to electrolytic treatment by the electrolysis apparatus I.
In the aeration tank II, the organic components of the electrolytic treatment wastewater B are decomposed and removed by activated sludge. And the mixed liquid C of the waste water from which this organic component was removed, and activated sludge is made to flow into the sedimentation tank III, and a supernatant liquid is discharged as the treated water D through solid-liquid separation.
On the other hand, most of the sludge separated into solid and liquid is transferred as a return sludge E to the aeration tank II and again subjected to biological treatment. However, some sludge is usually further concentrated as surplus sludge F. Then, the vacuum is discharged in the form of concentrated sludge, or the concentrated sludge is dehydrated and transported in the form of a dehydrated cake.

電解装置Ｉは、図２に示すように、仕切板３により電解部４と脱泡部５で分離されている。
有機溶剤含有廃水Ａは、この電解装置Ｉの電解部４に流入するが、その前段で、電解液タンク１に貯留された塩化ナトリウム又は塩化カリウムが電解液供給ポンプ２より添加される。
電解部４には電極板８が浸漬されており、直流電源装置６から電流供給ケーブル７を介して電流が供給され、電解処理を行う。
電解処理後の被処理液は、仕切板３の後段の脱泡部５に流入し、攪拌機９により脱泡された後、電解処理廃水Ｂとして曝気槽IIに流入する。攪拌機９は、駆動装置９１、攪拌軸９２及びインペラ９３を備えている。 As shown in FIG. 2, the electrolyzer I is separated by an electrolysis unit 4 and a defoaming unit 5 by a partition plate 3.
The organic solvent-containing wastewater A flows into the electrolysis unit 4 of the electrolysis apparatus I, and sodium chloride or potassium chloride stored in the electrolyte tank 1 is added from the electrolyte supply pump 2 at the preceding stage.
An electrode plate 8 is immersed in the electrolysis unit 4, and current is supplied from the DC power supply device 6 through the current supply cable 7 to perform electrolysis.
After the electrolytic treatment, the liquid to be treated flows into the defoaming section 5 at the rear stage of the partition plate 3, defoamed by the stirrer 9, and then flows into the aeration tank II as the electrolytic treatment waste water B. The stirrer 9 includes a drive device 91, a stirring shaft 92, and an impeller 93.

次に、本実施例の作用について説明する。
図２より、電解装置Ｉで炭化水素化合物及びアルコール類等といった有機溶剤を処理した場合の適用例を示す。
炭化水素化合物及びアルコール類、エーテル類といった有機溶剤を含む有機溶剤含有廃水Ａに、電解液タンク１に貯留された塩化ナトリウム又は塩化カリウムを添加する。
これら塩化物の添加率は、０．０５〜１０％（Ｗ／Ｖ）、好ましくは、０．３〜７％（Ｗ／Ｖ）とする。 Next, the operation of this embodiment will be described.
FIG. 2 shows an application example in the case where an organic solvent such as a hydrocarbon compound and alcohols is treated in the electrolysis apparatus I.
Sodium chloride or potassium chloride stored in the electrolyte tank 1 is added to an organic solvent-containing wastewater A containing an organic solvent such as a hydrocarbon compound and alcohols and ethers.
The addition rate of these chlorides is 0.05 to 10% (W / V), preferably 0.3 to 7% (W / V).

電解部４では、陰陽両極間で被電解処理液が電解処理されるが、このときに使用する電極板は、金属電極で、白金及びイリジウム又は白金を熱処理もしくは電気メッキによりコーティングしたものを使用する。
被電解処理液中にＣａもしくはＭｇといった陰極に析出する元素が混入している場合は、陰陽両極共、白金及びイリジウム又は白金をコーティングした金属電極を用い、定期的に極の変換を行い、スケールの除去を行う必要がある。
しかし、陰極への析出物が無いか、ごく少ない場合、陰極はＳＳ、ＳＵＳ３０４、ＳＵＳ３１６材などでもよい。 In the electrolysis unit 4, the electrolyzed solution is subjected to electrolytic treatment between the positive and negative electrodes, and the electrode plate used at this time is a metal electrode coated with platinum and iridium or platinum by heat treatment or electroplating. .
When elements to be deposited on the cathode, such as Ca or Mg, are mixed in the electrolyzed liquid, the negative and positive electrodes are used to convert the electrodes periodically using platinum and iridium or platinum-coated metal electrodes. Need to be removed.
However, when there is no deposit on the cathode or there is very little, the cathode may be SS, SUS304, SUS316 material, or the like.

電解時の電流密度は、０．１〜１００Ａ／ｄｍ２、好ましくは、１〜１０Ａ／ｄｍ２となるように供給する電流値を設定して電解処理を行うようにする。
電解処理時、陽極近傍では、被分解対象物質が強酸化状態で酸化分解されるとともに、塩化ナトリウムもしくは塩化カリウムといった塩素を含んだ電解質を被電解処理液に添加することにより、電極間で、酸化作用の大きい次亜塩素酸が生成され、被分解対象物質はさらに酸化分解を受ける。
これらの相乗効果により、被電解物質濃度が低濃度であっても十分な分解効果を有し、特に難分解な芳香族化合物の開環反応を促進することができる。 The current density for electrolysis is set to 0.1 to 100 A / dm 2 , preferably 1 to 10 A / dm 2, and the electrolysis treatment is performed by setting a current value to be supplied.
At the time of electrolytic treatment, the substance to be decomposed is oxidized and decomposed in a strong oxidation state near the anode, and an electrolyte containing chlorine such as sodium chloride or potassium chloride is added to the electrolytic treatment solution to oxidize between the electrodes. Hypochlorous acid having a large effect is generated, and the substance to be decomposed further undergoes oxidative decomposition.
Due to these synergistic effects, the ring-opening reaction of an aromatic compound that has a sufficient decomposition effect even when the concentration of the electrolyzed substance is low and that is particularly difficult to decompose can be accelerated.

次に、白金及びイリジウム又は白金をコーティングした金属電極を用い、５％の塩化ナトリウムを含んだ図３（ａ）に示す組成の廃水を１０Ａ／ｄｍ２で電解処理した。
図３（ａ）より、処理前の廃水は、エタノール及びイソプロピルアルコール（以降、ＩＰＡと称す）をリッチに含む。また、廃水の総ＣＯＤ値は、８００００ｍｇ／Ｌであるが、エタノール及びＩＰＡを除いた各組成のＣＯＤ値は、１０００ｍｇ／Ｌ未満の低濃度である。 Next, using a metal electrode coated with platinum and iridium or platinum, wastewater having a composition shown in FIG. 3A containing 5% sodium chloride was subjected to electrolytic treatment at 10 A / dm 2 .
As shown in FIG. 3A, the waste water before treatment contains ethanol and isopropyl alcohol (hereinafter referred to as IPA) richly. Moreover, although the total COD value of waste water is 80000 mg / L, the COD value of each composition except ethanol and IPA is a low concentration of less than 1000 mg / L.

次に、電解処理後の各組成の分解率を図３（ｂ）に示す。エタノール及びＩＰＡの分解率は５０〜６０％程度であるのに対し、トルエン、エチルベンゼン、ｏ−キシレン、ｐ−キシレン、ｍ−キシレンといった芳香族系炭化水素は、何れも９０％以上の高い分解率を示している。これは、電解による開環反応の促進効果が極めて大きいことを表している。
また、本廃水の処理前のＢＯＤ値が、３０万ｍｇ／Ｌであるのに対し、電解処理後のＢＯＤ値が４０万ｍｇ／Ｌとなり易分解化することが確認されている。 Next, the decomposition rate of each composition after electrolytic treatment is shown in FIG. While the decomposition rate of ethanol and IPA is about 50 to 60%, aromatic hydrocarbons such as toluene, ethylbenzene, o-xylene, p-xylene and m-xylene all have a high decomposition rate of 90% or more. Is shown. This represents that the effect of promoting the ring-opening reaction by electrolysis is extremely large.
Further, it has been confirmed that the BOD value before treatment of the waste water is 300,000 mg / L, whereas the BOD value after electrolytic treatment is 400,000 mg / L and is easily decomposed.

易分解化した電解処理廃水Ｂを曝気槽IIに流入させることによって、汚泥転換速度が速くなり、その分、曝気槽IIに供給される酸素の消費が活性汚泥の自己消化に費やされ、余剰汚泥の発生量を７０〜３０％程度削減することが可能となる。
なお、電解装置Ｉの電解部４で電解処理を行った被電解処理液は、電解過程で一部の水の分解が進行し、酸素ガス等が発生するため、脱泡部５で攪拌機９により脱泡を行うのが望ましいが省略することも可能である。 By making the easily decomposed electrolytic treatment wastewater B flow into the aeration tank II, the sludge conversion speed is increased, and the consumption of oxygen supplied to the aeration tank II is spent on the self-digestion of activated sludge, and surplus It becomes possible to reduce the generation amount of sludge by about 70 to 30%.
In addition, since the water to be electrolyzed in the electrolysis section 4 of the electrolysis apparatus I undergoes some water decomposition during the electrolysis process and generates oxygen gas or the like, the defoaming section 5 uses the stirrer 9 Although defoaming is desirable, it can be omitted.

以上、本発明の有機溶剤含有廃水の処理方法について、そ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 processing method of the organic solvent containing wastewater of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning, it is appropriate. Its configuration can be changed.

本発明の有機溶剤含有廃水の処理方法は、有機溶剤等を電解処理で易分解化することにより、活性汚泥処理を行う廃水処理施設での負荷を軽減し、処理良好な処理水質を確保するとともに発生汚泥量を低減するという特性を有していることから、例えば、炭化水素化合物及びアルコール類等の有機溶剤を製造工程で利用し、この有機溶剤を含んだ排水を活性汚泥で処理する施設で好適に利用することができる。   The organic solvent-containing wastewater treatment method of the present invention reduces the burden on wastewater treatment facilities that perform activated sludge treatment by easily decomposing organic solvents etc. by electrolytic treatment, and ensures good treatment water quality. Since it has the characteristic of reducing the amount of generated sludge, for example, it is a facility that uses organic solvents such as hydrocarbon compounds and alcohols in the manufacturing process and treats wastewater containing this organic solvent with activated sludge. It can be suitably used.

本発明の有機溶剤含有廃水の処理方法の一実施例を示すフロー図である。It is a flowchart which shows one Example of the processing method of the organic solvent containing wastewater of this invention. 同有機溶剤含有廃水の処理方法で使用する電解装置を示す断面図である。It is sectional drawing which shows the electrolysis apparatus used with the processing method of the organic solvent containing wastewater. （ａ）は廃水の組成と濃度の一例を示すグラフ、（ｂ）は同廃水の電解処理後の各組成の分解率を示すグラフである。(A) is a graph which shows an example of a composition and density | concentration of wastewater, (b) is a graph which shows the decomposition rate of each composition after the electrolytic treatment of the wastewater.

符号の説明Explanation of symbols

Ａ 有機溶剤含有廃水
Ｂ 電解処理廃水
Ｃ 混合液
Ｄ 処理水
Ｅ 返送汚泥
Ｆ 余剰汚泥
Ｉ 電解装置
II 曝気槽
III 沈殿槽
１ 電解液タンク
２ 電解液供給ポンプ
３ 仕切板
４ 電解部
５ 脱泡部
６ 直流電源装置
７ 電流供給ケーブル
８ 電極板
９ 攪拌機
９１ 駆動装置
９２ 攪拌軸
９３ インペラ A Organic solvent-containing wastewater B Electrolytic treatment wastewater C Mixed solution D Treated water E Return sludge F Surplus sludge I Electrolyzer
II Aeration tank
III Precipitation tank 1 Electrolyte tank 2 Electrolyte supply pump 3 Partition plate 4 Electrolytic unit 5 Defoaming unit 6 DC power supply device 7 Current supply cable 8 Electrode plate 9 Stirrer 91 Drive unit 92 Stirring shaft 93 Impeller

Claims (5)

炭化水素化合物又はアルコール類等を含む有機溶剤含有廃水を活性汚泥を用いて生物分解する有機溶剤含有廃水の処理方法において、活性汚泥処理を行う廃水処理施設の前段に電解装置を設け、活性汚泥処理を行う前に有機溶剤含有廃水に電解処理を施すことを特徴とする有機溶剤含有廃水の処理方法。   In an organic solvent-containing wastewater treatment method that biodegrades organic solvent-containing wastewater containing hydrocarbon compounds or alcohols using activated sludge, an electrolyzer is provided in the preceding stage of the wastewater treatment facility that performs activated sludge treatment. An organic solvent-containing wastewater treatment method comprising subjecting an organic solvent-containing wastewater to an electrolytic treatment before performing the step. 電解装置に用いる電極板として金属電極を用いることを特徴とする請求項１記載の有機溶剤含有廃水の処理方法。   2. The method for treating organic solvent-containing wastewater according to claim 1, wherein a metal electrode is used as an electrode plate used in the electrolysis apparatus. チタン基材に白金及びイリジウム又は白金をコーティングした金属電極を用い、電解時の電流密度が０．１〜１００Ａ／ｄｍ２となるように金属電極に電流を供給することを特徴とする請求項１又は２記載の有機溶剤含有廃水の処理方法。 2. A metal electrode obtained by coating platinum and iridium or platinum on a titanium base material, and supplying current to the metal electrode so that a current density during electrolysis is 0.1 to 100 A / dm 2. Or the processing method of wastewater containing an organic solvent of 2. 有機溶剤含有廃水に電解質を添加することを特徴とする請求項１、２又は３記載の有機溶剤含有廃水の処理方法。   The method for treating an organic solvent-containing wastewater according to claim 1, 2, or 3, wherein an electrolyte is added to the organic solvent-containing wastewater. 有機溶剤含有廃水に塩化ナトリウム又は塩化カリウムを０．０５〜１０％（Ｗ／Ｖ）の濃度で添加することを特徴とする請求項１、２、３又は４記載の有機溶剤含有廃水の処理方法。   5. The method for treating organic solvent-containing wastewater according to claim 1, wherein sodium chloride or potassium chloride is added to the organic solvent-containing wastewater at a concentration of 0.05 to 10% (W / V). .
JP2007102827A 2007-04-10 2007-04-10 Method for treating organic solvent-containing waste water Withdrawn JP2008259930A (en)

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