JP2013220387A - Method and apparatus for treating wastewater - Google Patents

Method and apparatus for treating wastewater Download PDF

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JP2013220387A
JP2013220387A JP2012093827A JP2012093827A JP2013220387A JP 2013220387 A JP2013220387 A JP 2013220387A JP 2012093827 A JP2012093827 A JP 2012093827A JP 2012093827 A JP2012093827 A JP 2012093827A JP 2013220387 A JP2013220387 A JP 2013220387A
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treatment
ozone
water
treated water
tank
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Ryuta Daigon
隆太 大権
Koji Tsuchiya
幸治 土屋
Yuji Nikaido
裕司 二階堂
Yukio Yamaguchi
幸夫 山口
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YAMAE KK
Toyota Motor Corp
JTEKT Coating Corp
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YAMAE KK
CNK Co Ltd Japan
Toyota Motor Corp
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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
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Activated Sludge Processes (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for treating waste water which give a high throughput to address wastewater containing volatile organic compounds and organic matter at high concentrations.SOLUTION: Since ozone treatment and activated sludge treatment are applied again to treated water subjected once to ozone treatment and activated sludge treatment, throughput can be increased by using expensive ozone efficiently, so that wastewater containing dispersed solid components including a coating material at high concentration can be treated at a low cost.

Description

本発明は、揮発性有機化合物と有機物とを含む排水を処理する方法及び装置に関する。   The present invention relates to a method and apparatus for treating wastewater containing volatile organic compounds and organic substances.

周知のように、自動車塗装設備から排出される工業排水（廃液）は、各種顔料、有機樹脂、架橋剤、揮発性物質、界面活性剤等を含み、固形成分、易分解性成分、難分解性成分、揮発成分、水等で構成される。このような排水を処理するための装置及び方法は、例えば、特許文献１に開示されている。   As is well known, industrial wastewater (waste liquid) discharged from automobile painting equipment contains various pigments, organic resins, cross-linking agents, volatile substances, surfactants, etc., solid components, readily decomposable components, hardly degradable Consists of components, volatile components, water and the like. An apparatus and a method for treating such waste water are disclosed in Patent Document 1, for example.

特開２００７−２９８２５号公報JP 2007-29825 A

特許文献１に記載された発明では、原水が高濃度、すなわち、原水が多量の有機物を含有する場合、凝集処理能力の不足により、要求される水質の一次処理水を得ることが困難になる。また、電解処理では、水槽内に配置した電極間に通電して排水を電気分解するため、排水が多量の樹脂成分を含有する場合、電極間に閉塞が生じる虞がある。さらに、原水に揮発性有機化合物（Volatile Organic Compounds、以下、VOCという）が含まれる場合、揮発したVOCが環境を汚染する虞がある。   In the invention described in Patent Document 1, when the raw water has a high concentration, that is, when the raw water contains a large amount of organic matter, it becomes difficult to obtain the primary treated water having the required water quality due to the lack of the coagulation treatment ability. Further, in the electrolytic treatment, since the wastewater is electrolyzed by energizing between the electrodes arranged in the water tank, there is a possibility that clogging occurs between the electrodes when the wastewater contains a large amount of resin component. Furthermore, when the raw water contains volatile organic compounds (hereinafter referred to as VOC), the volatilized VOC may contaminate the environment.

そこで本発明は、上記事情に鑑みてなされたもので、揮発性有機化合物と有機物とを高濃度で含有する排水に対応する高い処理能力を備える排水処理方法及び装置を提供することを課題としてなされたものである。   Then, this invention is made | formed in view of the said situation, and it is made as a subject to provide the wastewater treatment method and apparatus provided with the high processing capacity corresponding to the waste_water | drain containing a volatile organic compound and organic substance with high concentration. It is a thing.

上記課題を解決するために、本発明の排水処理方法は、揮発性有機化合物と有機物とを含有する排水を処理する方法において、原水をオゾン処理しながら分離された固形成分を除去する第１工程と、前記第１工程により得られた一次処理水を凝集沈殿法により処理する第２工程と、前記第２工程により得られた二次処理水を活性汚泥法により処理する第３工程と、前記第３工程により得られた三次処理水をオゾン処理する第４工程と、前記第４工程により得られた四次処理水を活性汚泥法により処理する第５工程と、を含む排水処理方法であって、各工程から排出された排気に含まれる揮発性有機化合物を捕集して前記第１工程又は前記第３工程で再処理する工程を含むことを特徴とする。   In order to solve the above-mentioned problems, a wastewater treatment method of the present invention is a method for treating wastewater containing a volatile organic compound and an organic substance, and a first step of removing separated solid components while ozone treatment of raw water is performed. A second step of treating the primary treated water obtained by the first step by a coagulation sedimentation method, a third step of treating the secondary treated water obtained by the second step by an activated sludge method, A wastewater treatment method comprising: a fourth step of treating the tertiary treated water obtained in the third step with ozone; and a fifth step of treating the fourth treated water obtained in the fourth step by an activated sludge method. And collecting the volatile organic compound contained in the exhaust gas discharged from each step and reprocessing in the first step or the third step.

上記課題を解決するために、本発明の排水処理装置は、揮発性有機化合物と有機物とを含有する排水を処理する装置において、原水が供給される第１オゾン反応槽を有し、該第１オゾン反応槽内の原水にオゾンを添加する第１オゾン処理装置と、前記第１オゾン処理装置により処理された一次処理水に含まれる分離された固形成分を除去するスラッジ分離装置と、前記一次処理水を前記第１オゾン反応槽と前記スラッジ分離装置との間で循環させる処理水循環装置と、前記第１オゾン処理装置及び前記スラッジ分離装置により処理された一次処理水が供給される凝集沈殿槽を有し、該凝集沈殿槽内の一次処理水を凝集沈殿処理する凝集沈殿装置と、前記凝集沈殿装置により処理された二次処理水が供給される第１生物処理槽を有し、該第１生物処理槽内の二次処理水を活性汚泥処理する第１生物処理装置と、前記第１生物処理装置により処理された三次処理水が供給される第２オゾン反応槽を有し、該第２オゾン反応槽内の三次処理水にオゾンを添加する第２オゾン処理装置と、前記第２オゾン処理装置により処理された四次処理水が供給される第２生物処理槽を有し、該第２生物処理槽内の四次処理水を活性汚泥処理する第２生物処理装置と、を含む排水処理装置であって、前記排水を処理する過程で排出された排気に含まれる揮発性有機化合物を捕集する捕集装置を含むことを特徴とする。   In order to solve the above-described problems, a wastewater treatment apparatus of the present invention is a device for treating wastewater containing a volatile organic compound and an organic substance, and includes a first ozone reaction tank to which raw water is supplied, A first ozone treatment device for adding ozone to raw water in an ozone reaction tank, a sludge separation device for removing separated solid components contained in primary treated water treated by the first ozone treatment device, and the primary treatment A treated water circulation device for circulating water between the first ozone reaction tank and the sludge separation device; and a coagulation sedimentation tank to which primary treated water treated by the first ozone treatment device and the sludge separation device is supplied. A coagulation sedimentation apparatus that coagulates and precipitates the primary treated water in the coagulation sedimentation tank, and a first biological treatment tank that is supplied with the secondary treated water treated by the coagulation sedimentation apparatus. Living A first biological treatment device for treating the secondary treated water in the treatment tank with activated sludge; and a second ozone reaction tank to which the tertiary treated water treated by the first biological treatment device is supplied. A second ozone treatment device for adding ozone to the tertiary treatment water in the reaction tank; and a second biological treatment tank to which the quaternary treatment water treated by the second ozone treatment device is supplied. A wastewater treatment apparatus including a second biological treatment apparatus that treats quaternary treated water in a treatment tank with activated sludge, and collects volatile organic compounds contained in exhaust discharged in the process of treating the wastewater. Including a collecting device.

本発明によれば、揮発性有機化合物と有機物とを高濃度で含有する排水に対応するための高い処理能力を備える排水処理方法及び装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the waste water treatment method and apparatus provided with the high processing capability for respond | corresponding to the waste_water | drain containing a volatile organic compound and organic substance with high concentration can be provided.

本実施形態の構造を説明するための概略的な図である。It is a schematic diagram for demonstrating the structure of this embodiment. 本実施形態の作用を説明するための図である。It is a figure for demonstrating the effect | action of this embodiment.

本発明の一実施形態を添付した図を参照して説明する。なお、本実施形態では、例えば、塗装設備から排出されて、各種顔料、有機樹脂、架橋剤、揮発性物質、界面活性剤等を含み、固形成分、易分解性成分、難分解性成分、揮発成分、水等で構成される排水（原水）を処理する方法及び装置１を説明する。   An embodiment of the present invention will be described with reference to the accompanying drawings. In this embodiment, for example, it is discharged from a painting facility and contains various pigments, organic resins, cross-linking agents, volatile substances, surfactants, etc., and includes solid components, easily decomposable components, hardly decomposable components, volatilization. A method and apparatus 1 for treating waste water (raw water) composed of components, water and the like will be described.

図１は、本実施形態の排水処理装置１の構成を概略的に示すものである。この図に示されるように、排水処理装置１は、第１オゾン処理装置２、スラッジ分離装置３、凝集沈殿装置４、第１生物処理装置５、第２オゾン処理装置６、及び第２生物処理装置７を含む   FIG. 1 schematically shows the configuration of a wastewater treatment apparatus 1 of the present embodiment. As shown in this figure, the waste water treatment device 1 includes a first ozone treatment device 2, a sludge separation device 3, a coagulation sedimentation device 4, a first biological treatment device 5, a second ozone treatment device 6, and a second biological treatment. Including device 7

第１オゾン処理装置２は、原水が供給される第１オゾン反応槽８を有する。第１オゾン反応槽８内の原水は、オゾン発生装置９から供給されるオゾン（オゾンガス）が添加されてオゾン処理される。第１オゾン処理装置２によりオゾン処理された一次処理水は、活性汚泥法による処理、すなわち、第１生物処理装置５における処理が促進される性状を得ることができる。具体的には、オゾンが添加されることにより、原水中の界面活性剤、架橋剤等が破壊されるとともに顔料、染料、有機樹脂等のスラッジ（固形成分）が浮上又は沈降して分離される。なお、オゾン発生装置９は、例えば、光化学反応、電解反応、放電反応、放射線反応等を利用してオゾンガスを発生する周知の装置を使用することができる。   The first ozone treatment device 2 has a first ozone reaction tank 8 to which raw water is supplied. The raw water in the first ozone reaction tank 8 is subjected to ozone treatment by adding ozone (ozone gas) supplied from the ozone generator 9. The primary treated water that has been subjected to ozone treatment by the first ozone treatment device 2 can have a property that promotes treatment by the activated sludge method, that is, treatment in the first biological treatment device 5. Specifically, by adding ozone, surfactants, crosslinking agents, etc. in raw water are destroyed and sludge (solid components) such as pigments, dyes, organic resins, etc. floats or settles and is separated. . The ozone generator 9 may be a known device that generates ozone gas using, for example, a photochemical reaction, an electrolytic reaction, a discharge reaction, a radiation reaction, or the like.

第１オゾン処理装置２によって処理された一次処理水は、ポンプ１０によってスラッジ分離装置３へ送水される。スラッジ分離装置３は、第１オゾン処理装置２によって処理された一次処理水に含まれる分離されたスラッジを除去する。本実施形態では、スラッジ分離装置３は、例えば、浮上分離式の既存設備をそのまま適用することができる。また、スラッジ分離装置３によって回収されたスラッジは、脱水装置１１によって脱水された後、例えば、コンベア等によって搬出される。本実施形態では、スラッジ分離装置３と第１オゾン反応槽８とが処理水循環路１２（処理水循環装置）によって連通されており、この処理水循環路１２により、スラッジ分離装置３と第１オゾン反応槽８との間で一次処理水を循環させて処理することができる（第１工程による処理）。なお、本実施形態は、スラッジ分離装置３を通過した一次処理水の供給先を第１オゾン反応槽８と凝集沈殿槽１３とに切り替えるためのバルブを配置して構成することができる。   The primary treated water treated by the first ozone treatment device 2 is sent to the sludge separation device 3 by the pump 10. The sludge separation device 3 removes the separated sludge contained in the primary treated water treated by the first ozone treatment device 2. In the present embodiment, the sludge separation device 3 can be applied as it is, for example, an existing facility of floating separation type. Further, the sludge collected by the sludge separator 3 is dehydrated by the dehydrator 11 and then carried out by, for example, a conveyor. In the present embodiment, the sludge separation device 3 and the first ozone reaction tank 8 are communicated with each other by the treated water circulation path 12 (treated water circulation apparatus), and the sludge separation apparatus 3 and the first ozone reaction tank are communicated with the treated water circulation path 12. The primary treated water can be circulated between the two and treated (process by the first step). In addition, this embodiment can arrange | position the valve | bulb for switching the supply destination of the primary treated water which passed the sludge separation apparatus 3 to the 1st ozone reaction tank 8 and the coagulation sedimentation tank 13.

凝集沈殿装置４は、スラッジ分離装置３によって処理された一次処理水が供給される凝集沈殿槽１３を有する。凝集沈殿槽１３内の一次処理水には凝集剤が添加される。これにより、凝集沈殿槽１３内の一次処理水に含まれる凝集分離性が高い有機物を沈殿させて除去することができる（第２工程による処理）。本実施形態では、凝集沈殿装置４は、既存設備をそのまま適用することができる。また、凝集沈殿装置４によって回収されたスラッジは、脱水装置１４によって脱水された後、例えば、コンベア等によって搬出される。   The coagulation sedimentation device 4 has a coagulation sedimentation tank 13 to which the primary treated water treated by the sludge separation device 3 is supplied. A flocculant is added to the primary treated water in the coagulation sedimentation tank 13. Thereby, the organic substance with high aggregation separability contained in the primary treated water in the aggregation sedimentation tank 13 can be precipitated and removed (treatment by the second step). In this embodiment, the existing equipment can be applied to the coagulation sedimentation apparatus 4 as it is. In addition, the sludge collected by the coagulation sedimentation device 4 is dehydrated by the dehydration device 14 and then carried out by, for example, a conveyor.

第１生物処理装置５は、凝集沈殿装置４により処理された二次処理水が供給される第１生物処理槽１５を有する。第１生物処理槽１５内の二次処理水は、活性汚泥処理、すなわち、易分解性成分が活性汚泥により分解される（第３工程による処理）。第１生物処理装置５は、第１生物処理槽１５へ供給路１６を介してエアを供給するためのブロワ１７を有する。ブロワ１７によって供給されたエアは、第１生物処理槽１５の底部から気泡となって第１生物処理槽１５内の二次処理水に放出される。これにより、活性汚泥中の生物が活性化されて処理能力を高めることができる。なお、ブロワ１７の代わりに酸素発生装置を設けて第１生物処理槽１５内の活性汚泥中の生物に酸素が供給されるように構成することもできる。   The first biological treatment device 5 has a first biological treatment tank 15 to which secondary treated water treated by the coagulation sedimentation device 4 is supplied. The secondary treated water in the first biological treatment tank 15 is activated sludge treatment, that is, easily decomposable components are decomposed by activated sludge (treatment in the third step). The first biological treatment apparatus 5 has a blower 17 for supplying air to the first biological treatment tank 15 via the supply path 16. The air supplied by the blower 17 is released as bubbles from the bottom of the first biological treatment tank 15 into the secondary treatment water in the first biological treatment tank 15. Thereby, the living thing in activated sludge is activated and processing capacity can be improved. An oxygen generator may be provided instead of the blower 17 so that oxygen is supplied to the organisms in the activated sludge in the first biological treatment tank 15.

第１生物処理装置５によって処理された三次処理水は、第１生物処理槽１５内に配設された液中膜によって固形物（活性汚泥）が除去されてポンプ１８によって第２オゾン反応槽１９へ送水される。第２オゾン反応槽１９内の三次処理水は、オゾン発生装置９から供給されるオゾン（オゾンガス）が添加されてオゾン処理（再オゾン処理）される（第４工程による処理）。第２オゾン処理装置６によりオゾン処理された四次処理水は、活性汚泥法による処理、すなわち、第２生物処理装置７における処理が促進される性状を得ることができる。なお、第１生物処理槽１５内の液中膜によって除去された固形物は、脱水装置２５によって脱水された後、例えば、コンベア等によって搬出される。また、第２オゾン反応槽１９は、第１オゾン反応槽８と同型式の槽を使用することができる。   The tertiary treated water treated by the first biological treatment apparatus 5 is freed from solid matter (activated sludge) by a submerged film disposed in the first biological treatment tank 15, and the second ozone reaction tank 19 by the pump 18. Water is sent to The tertiary treated water in the second ozone reaction tank 19 is subjected to ozone treatment (re-ozone treatment) by adding ozone (ozone gas) supplied from the ozone generator 9 (treatment by the fourth step). The quaternary treated water that has been subjected to ozone treatment by the second ozone treatment device 6 can obtain a property that promotes treatment by the activated sludge method, that is, treatment in the second biological treatment device 7. The solid matter removed by the submerged film in the first biological treatment tank 15 is dehydrated by the dehydrator 25 and then carried out by, for example, a conveyor. The second ozone reaction tank 19 can be the same type as the first ozone reaction tank 8.

第２オゾン処理装置６によって処理された四次処理水は、ポンプ２０によって貯水槽２１へ送水され、さらに、貯水槽２１内の四次処理水は、第２生物処理槽２３へ送水される。第２生物処理槽２３内の四次処理水は、活性汚泥処理（再活性汚泥処理）、すなわち、易分解性成分が活性汚泥により分解される（第５工程による処理）。第２生物処理槽２３内の四次処理水には、ブロワ１７から供給路２４を介してエアが供給される。ブロワ１７によって供給されたエアは、第２生物処理槽２３の底部から気泡となって第２生物処理槽２３内の四次処理水に放出される。なお、前述したように、ブロワ１７の代わりに酸素発生装置を設けて第２生物処理槽２３内の活性汚泥中の生物に酸素が供給されるように構成することもできる。   The quaternary treated water treated by the second ozone treatment device 6 is sent to the water storage tank 21 by the pump 20, and further the quaternary treated water in the water storage tank 21 is sent to the second biological treatment tank 23. The quaternary treated water in the second biological treatment tank 23 is activated sludge treatment (reactivated sludge treatment), that is, easily decomposable components are decomposed by activated sludge (treatment in the fifth step). Air is supplied from the blower 17 through the supply path 24 to the quaternary treated water in the second biological treatment tank 23. The air supplied by the blower 17 is released as bubbles from the bottom of the second biological treatment tank 23 to the quaternary treated water in the second biological treatment tank 23. As described above, an oxygen generator may be provided in place of the blower 17 so that oxygen is supplied to the organisms in the activated sludge in the second biological treatment tank 23.

第２生物処理装置７によって処理された処理水は、第２生物処理槽２３内に配設された液中膜によって固形物（活性汚泥）が除去された後、ポンプ２２によって浄水として河川等の環境へ排出したり、他の設備で使用したりすることができる。なお、第２生物処理槽２３内の液中膜によって除去された固形物は、脱水装置２５によって脱水された後、例えば、コンベア等によって搬出される。   The treated water treated by the second biological treatment device 7 is subjected to removal of solid matter (activated sludge) by the submerged membrane disposed in the second biological treatment tank 23, and then the purified water by the pump 22 such as a river. It can be discharged into the environment or used in other equipment. The solid matter removed by the submerged membrane in the second biological treatment tank 23 is dehydrated by the dehydrator 25 and then carried out by, for example, a conveyor.

図１に示されるように、排水処理装置１は、前述した処理を通じて発生するVOC（揮発性有機化合物）を水中に捕集するVOC捕集装置２６を有する。本実施形態では、スラッジ分離装置３、凝集沈殿槽１３、第１生物処理槽１５、貯水槽２１、及び第２生物処理槽２３から排出されたVOCがVOC捕集装置２６によって捕集される。なお、VOC捕集装置２６によって捕集されたVOCを含有する処理水は、第１オゾン反応槽８又は第１生物処理槽１５へ送水されて有機成分が分解される。また、VOC捕集装置２６内の揮発性有機化合物を回収するための水は、第２生物処理装置７によって処理された処理水（浄水）の一部が使用され、この処理水（浄水）は、供給路２７を介してVOC捕集装置２６へ送水される。   As shown in FIG. 1, the wastewater treatment apparatus 1 includes a VOC collection device 26 that collects VOC (volatile organic compound) generated through the above-described treatment in water. In the present embodiment, VOCs discharged from the sludge separation device 3, the coagulation sedimentation tank 13, the first biological treatment tank 15, the water storage tank 21, and the second biological treatment tank 23 are collected by the VOC collection device 26. The treated water containing VOC collected by the VOC collecting device 26 is sent to the first ozone reaction tank 8 or the first biological treatment tank 15 to decompose the organic components. Moreover, a part of the treated water (purified water) treated by the second biological treatment device 7 is used as the water for recovering the volatile organic compounds in the VOC collection device 26, and this treated water (purified water) is Then, the water is fed to the VOC collection device 26 via the supply path 27.

水質汚濁指標が図２に示される原水を、前述した排水処理装置１、すなわち、第１工程、第２工程、第３工程、第４工程、及び第５工程によって順次処理し、第１工程による処理後の一次処理水、第３工程による処理後の三次処理水、第４工程による処理後の四次処理水、及び第５工程による処理後の処理水（浄水）における各処理水の生物化学的酸素要求量BOD（Biochemical Oxygen Demand）、化学的酸素要求量COD（Chemical Oxygen Demand）、懸濁物質SS（Suspended Substance）を測定する。   The raw water whose water pollution index is shown in FIG. 2 is sequentially processed by the above-described waste water treatment apparatus 1, that is, the first process, the second process, the third process, the fourth process, and the fifth process, and the first process. Biochemistry of each treated water in primary treated water after treatment, tertiary treated water after treatment in the third step, quaternary treated water after treatment in the fourth step, and treated water (purified water) after treatment in the fifth step The chemical oxygen demand (BOD), chemical oxygen demand (COD) (chemical oxygen demand), and suspended substance (SS) are measured.

ここで、生物化学的酸素要求量BODは、JIS K 0102-21. JIS K 0102-32.3 :1998 隔膜電極法に基づき測定した。また、化学的酸素要求量CODは、JIS K 0102-17. :1998 滴定法に基づき測定した。さらに、懸濁物質SSは、JIS K 0102-14.1 :1998 ろ過重量法に基づき測定した。なお、図２を参照すると、原水の水質汚濁指標は以下に示す通りである。
（原水）
BOD：50,000 〜 90,000［mg/L］
COD：37,000 〜 60,000［mg/L］
SS： 4,850 〜 37,500［mg/L］ Here, the biochemical oxygen demand BOD was measured based on the JIS K 0102-21. JIS K 0102-32.3: 1998 diaphragm electrode method. The chemical oxygen demand COD was measured based on JIS K 0102-17.:1998 titration method. Furthermore, the suspended solid SS was measured based on JIS K 0102-14.1: 1998 filtration weight method. In addition, referring to FIG. 2, the water pollution index of raw water is as shown below.
(Raw water)
BOD: 50,000 to 90,000 [mg / L]
COD: 37,000-60,000 [mg / L]
SS: 4,850 to 37,500 [mg / L]

また、図２を参照すると、第１工程によってオゾン処理された一次処理水の水質汚濁指標は以下に示す通りである。
（一次処理水）
BOD：19,000 〜 35,000［mg/L］
COD：14,000 〜 21,000［mg/L］
SS： 〜 42,000［mg/L］ Referring to FIG. 2, the water pollution index of the primary treated water that has been subjected to the ozone treatment in the first step is as shown below.
(Primary treated water)
BOD: 19,000-35,000 [mg / L]
COD: 14,000-21,000 [mg / L]
SS: ~ 42,000 [mg / L]

また、図２を参照すると、第１及び第２工程を経て、第３工程によって活性汚泥処理された三次処理水の水質汚濁指標は以下に示す通りである。
（三次処理水）
BOD：1.2 〜 6.0［mg/L］
COD：140 〜 190［mg/L］
SS：≒ 0 In addition, referring to FIG. 2, the water pollution index of the tertiary treated water that has been subjected to the activated sludge treatment in the third step through the first and second steps is as shown below.
(Tertially treated water)
BOD: 1.2 to 6.0 [mg / L]
COD: 140 to 190 [mg / L]
SS: ≒ 0

また、図２を参照すると、第１乃至第３工程を経て、第４工程によってオゾン処理（再オゾン処理）された四次処理水の水質汚濁指標は以下に示す通りである。
（四次処理水）
BOD：4.8 〜 24［mg/L］
COD：4.3 〜 30［mg/L］
SS：≒ 0 Referring to FIG. 2, the water pollution index of the quaternary treated water that has been subjected to the ozone treatment (re-ozone treatment) in the fourth step through the first to third steps is as follows.
(Fourth treated water)
BOD: 4.8-24 [mg / L]
COD: 4.3-30 [mg / L]
SS: ≒ 0

また、図２を参照すると、第１乃至第４工程を経て、第５工程によって活性汚泥処理（再活性汚泥処理）された処理水（浄水）の水質汚濁指標は以下に示す通りである。
（浄水）
BOD：0.6 〜 3.6［mg/L］
COD： 25 〜 33［mg/L］
SS：≒ 0 Further, referring to FIG. 2, the water pollution index of treated water (purified water) subjected to activated sludge treatment (reactivated sludge treatment) in the fifth step through the first to fourth steps is as shown below.
(Purified water)
BOD: 0.6 to 3.6 [mg / L]
COD: 25 to 33 [mg / L]
SS: ≒ 0

以上の測定結果からわかるように、生物化学的酸素要求量BOD、化学的酸素要求量COD、及び懸濁物質SSの除去率を９９％以上とすることができた。また、第３工程によって活性汚泥処理された三次処理水の化学的酸素要求量CODが140 〜 190［mg/L］であるのに対し、第４工程によってオゾン処理（再オゾン処理）された四次処理水の化学的酸素要求量CODが4.3 〜 30［mg/L］であったことからわかるように、第３工程の活性汚泥処理で分解することができなかった難分解性成分を、第４工程によるオゾン処理（再オゾン処理）で分解することができた。   As can be seen from the above measurement results, the removal rate of biochemical oxygen demand BOD, chemical oxygen demand COD, and suspended solid SS could be 99% or more. In addition, the chemical oxygen demand COD of tertiary treated water treated by activated sludge in the third step is 140 to 190 [mg / L], whereas ozone treated (re-ozone treatment) in the fourth step is four. As can be seen from the chemical oxygen demand COD of the secondary treated water being 4.3 to 30 [mg / L], the hardly decomposable components that could not be decomposed by the activated sludge treatment in the third step were It could be decomposed by ozone treatment (re-ozone treatment) in four steps.

この実施形態では以下の効果を奏する。
本実施形態によれば、オゾン処理と活性汚泥処理とが施された処理水に、再度、オゾン処理と活性汚泥処理とを施すので、高価なオゾンを効率的に使用して処理能力を高めることが可能であり、塗料等の固形成分を分散状態で含む高濃度の排水（廃液）を低コストで処理することができる。 This embodiment has the following effects.
According to this embodiment, since ozone treatment and activated sludge treatment are performed again on treated water that has been subjected to ozone treatment and activated sludge treatment, the treatment capacity is increased by efficiently using expensive ozone. High concentration drainage (waste liquid) containing solid components such as paint in a dispersed state can be treated at low cost.

また、第１オゾン処理装置２によって処理された一次処理水を、処理水循環路１２（処理水循環装置）によってスラッジ分離装置３と第１オゾン反応槽８との間で循環させたので、塗装設備から排出される排水のような、各種顔料、染料、有機樹脂、架橋剤、有機溶剤、界面活性剤、油脂、及びその他の無機・有機成分を含み、固形成分、易分解性成分、難分解性成分、或いは疎水性有機物、親水性有機物等を含有する高濃度の原水を、固形成分と液体とに効率的に分離させることができる。また、オゾン処理による界面活性剤等の分解により、凝集沈殿処理が容易になる。さらに、染料、有機樹脂、架橋剤、有機溶剤、界面活性剤、油脂、及びその他の無機・有機成分を含み、固形成分、易分解性成分、難分解性成分、或いは疎水性有機物、親水性有機物等の成分がオゾンの強力な酸化作用により破壊されて低分子化するため、第１生物処理装置５における活性汚泥処理を促進させることができる。   Moreover, since the primary treated water treated by the first ozone treatment device 2 was circulated between the sludge separation device 3 and the first ozone reaction tank 8 by the treated water circulation path 12 (treated water circulation device), from the coating facility Contains various pigments, dyes, organic resins, crosslinking agents, organic solvents, surfactants, oils and fats, and other inorganic and organic components such as discharged wastewater, solid components, easily decomposable components, hardly decomposable components Alternatively, high-concentration raw water containing a hydrophobic organic substance, a hydrophilic organic substance or the like can be efficiently separated into a solid component and a liquid. Further, the coagulation and precipitation treatment is facilitated by the decomposition of the surfactant and the like by the ozone treatment. In addition, it contains dyes, organic resins, cross-linking agents, organic solvents, surfactants, oils and fats, and other inorganic and organic components, solid components, easily decomposable components, hardly decomposable components, or hydrophobic organic substances, hydrophilic organic substances Since these components are destroyed by the strong oxidizing action of ozone to lower the molecular weight, the activated sludge treatment in the first biological treatment apparatus 5 can be promoted.

さらに、各処理により発生したVOC（揮発性有機化合物）はVOC捕集装置２６によって水中に捕集され、VOC捕集装置２６によって捕集されたVOCを含有する処理水は第１オゾン処理装置２又は第１生物処理装置５によって有機成分が分解されるので、VOCが環境（大気）中へ放出されるのを防ぐことができる。また、VOC捕集装置２６で用いる水は第２生物処理装置７で処理された水を用いるので、新たに浄水を必要としない。   Furthermore, the VOC (volatile organic compound) generated by each treatment is collected in water by the VOC collection device 26, and the treated water containing VOC collected by the VOC collection device 26 is the first ozone treatment device 2. Or since an organic component is decomposed | disassembled by the 1st biological treatment apparatus 5, it can prevent that VOC is discharge | released in the environment (atmosphere). Moreover, since the water used with the VOC collection device 26 uses the water processed with the 2nd biological treatment apparatus 7, it does not require a fresh water newly.

なお、実施形態は上記に限定されるものではなく、例えば、次のように構成することができる。
第１工程において、スラッジ分離装置３によって除去することができなかった懸濁物質SSが一次処理水中に多量に存在すると判断される場合、一次処理水を凝集沈降処理するように排水処理装置１を構成することができる。
VOC（揮発性有機化合物）については、水に対する溶解度が低い成分が多量に存在すると判断される場合、VOC捕集装置２６をVOC除去装置へ変更することができる。
また、VOCを強制的に除去するため、スラッジ分離装置３にエアレーションをすることができる。 In addition, embodiment is not limited above, For example, it can comprise as follows.
In the first step, when it is determined that a large amount of suspended matter SS that could not be removed by the sludge separation device 3 is present in the primary treated water, the wastewater treatment device 1 is set so that the primary treated water is coagulated and settled. Can be configured.
As for VOC (volatile organic compound), when it is determined that there are a large amount of components having low solubility in water, the VOC collection device 26 can be changed to a VOC removal device.
Further, since the VOC is forcibly removed, the sludge separation device 3 can be aerated.

１ 排水処理装置、２ 第１オゾン処理装置、３ スラッジ分離装置、４ 凝集沈殿装置、５ 第１生物処理装置、６ 第２オゾン処理装置、７ 第２生物処理装置、８ 第１オゾン反応槽、１２ 処理水循環路（処理水循環装置）、１５ 第１生物処理槽、１９ 第２オゾン反応槽、２３ 第２生物処理槽、２６ VOC捕集装置 DESCRIPTION OF SYMBOLS 1 Waste water treatment apparatus, 2 1st ozone treatment apparatus, 3 Sludge separation apparatus, 4 Coagulation sedimentation apparatus, 5 1st biological treatment apparatus, 6 2nd ozone treatment apparatus, 7 2nd biological treatment apparatus, 8 1st ozone reaction tank, 12 treated water circulation path (treated water circulating device), 15 first biological treatment tank, 19 second ozone reaction tank, 23 second biological treatment tank, 26 VOC collection device

Claims (3)

揮発性有機化合物と有機物とを含有する排水を処理する方法において、
原水をオゾン処理しながら分離された固形成分を除去する第１工程と、
前記第１工程により得られた一次処理水を凝集沈殿法により処理する第２工程と、
前記第２工程により得られた二次処理水を活性汚泥法により処理する第３工程と、
前記第３工程により得られた三次処理水をオゾン処理する第４工程と、
前記第４工程により得られた四次処理水を活性汚泥法により処理する第５工程と、
を含む排水処理方法であって、
各工程から排出された排気に含まれる揮発性有機化合物を捕集して前記第１工程又は前記第３工程で再処理する工程を含むことを特徴とする排水処理方法。 In a method for treating wastewater containing volatile organic compounds and organic matter,
A first step of removing the separated solid components while treating raw water with ozone;
A second step of treating the primary treated water obtained in the first step by a coagulation sedimentation method;
A third step of treating the secondary treated water obtained in the second step by an activated sludge method;
A fourth step of ozone treatment of the tertiary treated water obtained in the third step;
A fifth step of treating the quaternary treated water obtained in the fourth step by an activated sludge method;
A wastewater treatment method comprising:
A wastewater treatment method comprising a step of collecting a volatile organic compound contained in exhaust gas discharged from each step and reprocessing in the first step or the third step. 揮発性有機化合物と有機物とを含有する排水を処理する装置において、
原水が供給される第１オゾン反応槽を有し、該第１オゾン反応槽内の原水にオゾンを添加する第１オゾン処理装置と、
前記第１オゾン処理装置により処理された一次処理水に含まれる分離された固形成分を除去するスラッジ分離装置と、
前記一次処理水を前記第１オゾン反応槽と前記スラッジ分離装置との間で循環させる処理水循環装置と、
前記第１オゾン処理装置及び前記スラッジ分離装置により処理された一次処理水が供給される凝集沈殿槽を有し、該凝集沈殿槽内の一次処理水を凝集沈殿処理する凝集沈殿装置と、
前記凝集沈殿装置により処理された二次処理水が供給される第１生物処理槽を有し、該第１生物処理槽内の二次処理水を活性汚泥処理する第１生物処理装置と、
前記第１生物処理装置により処理された三次処理水が供給される第２オゾン反応槽を有し、該第２オゾン反応槽内の三次処理水にオゾンを添加する第２オゾン処理装置と、
前記第２オゾン処理装置により処理された四次処理水が供給される第２生物処理槽を有し、該第２生物処理槽内の四次処理水を活性汚泥処理する第２生物処理装置と、
を含む排水処理装置であって、
前記排水を処理する過程で排出された排気に含まれる揮発性有機化合物を捕集する捕集装置を含むことを特徴とする排水処理装置。 In an apparatus for treating wastewater containing volatile organic compounds and organic matter,
A first ozone treatment device having a first ozone reaction tank to which raw water is supplied, and adding ozone to the raw water in the first ozone reaction tank;
A sludge separation device for removing the separated solid component contained in the primary treated water treated by the first ozone treatment device;
A treated water circulation device for circulating the primary treated water between the first ozone reaction tank and the sludge separation device;
A coagulation sedimentation apparatus having a coagulation sedimentation tank to which primary treated water treated by the first ozone treatment apparatus and the sludge separation apparatus is supplied, and coagulating sedimentation treatment of the primary treatment water in the coagulation sedimentation tank;
A first biological treatment apparatus having a first biological treatment tank to which secondary treated water treated by the coagulation sedimentation apparatus is supplied, and treating the secondary treated water in the first biological treatment tank with activated sludge;
A second ozone treatment tank having a second ozone reaction tank to which the tertiary treatment water treated by the first biological treatment apparatus is supplied, and adding ozone to the tertiary treatment water in the second ozone reaction tank;
A second biological treatment apparatus having a second biological treatment tank to which the quaternary treatment water treated by the second ozone treatment apparatus is supplied, and for treating the quaternary treatment water in the second biological treatment tank with activated sludge; ,
Wastewater treatment equipment including
A wastewater treatment apparatus comprising a collection device for collecting a volatile organic compound contained in exhaust gas discharged in the process of treating the wastewater. 前記捕集装置により捕集された揮発性有機化合物を前記第１オゾン処理装置又は第１生物処理装置へ供給する供給路を含むことを特徴とする請求項２に記載の排水処理装置。 The wastewater treatment apparatus according to claim 2, further comprising a supply path for supplying the volatile organic compound collected by the collection apparatus to the first ozone treatment apparatus or the first biological treatment apparatus.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105271617A (en) * 2015-11-05 2016-01-27 安徽锋亚环境技术有限公司 Internal consumption type antibiotic wastewater treatment process system
WO2017056325A1 (en) * 2015-10-02 2017-04-06 株式会社ヒューエンス Wastewater treatment system and wastewater treatment method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017056325A1 (en) * 2015-10-02 2017-04-06 株式会社ヒューエンス Wastewater treatment system and wastewater treatment method
JPWO2017056325A1 (en) * 2015-10-02 2017-10-05 株式会社ヒューエンス Waste water treatment system and waste water treatment method
CN105271617A (en) * 2015-11-05 2016-01-27 安徽锋亚环境技术有限公司 Internal consumption type antibiotic wastewater treatment process system

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