JP2003200180A - Treatment method for wastewater and advanced treatment apparatus therefor - Google Patents
Treatment method for wastewater and advanced treatment apparatus thereforInfo
- Publication number
- JP2003200180A JP2003200180A JP2002004137A JP2002004137A JP2003200180A JP 2003200180 A JP2003200180 A JP 2003200180A JP 2002004137 A JP2002004137 A JP 2002004137A JP 2002004137 A JP2002004137 A JP 2002004137A JP 2003200180 A JP2003200180 A JP 2003200180A
- Authority
- JP
- Japan
- Prior art keywords
- ozone
- treatment
- reaction tank
- tank
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000011282 treatment Methods 0.000 title claims abstract description 107
- 239000002351 wastewater Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 45
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 197
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 238000006243 chemical reaction Methods 0.000 claims description 108
- 238000005192 partition Methods 0.000 claims description 21
- 238000004065 wastewater treatment Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 230000005587 bubbling Effects 0.000 description 9
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 238000006065 biodegradation reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000010840 domestic wastewater Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000010979 pH adjustment Methods 0.000 description 3
- 230000001603 reducing effect Effects 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000011221 initial treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 102100033041 Carbonic anhydrase 13 Human genes 0.000 description 1
- 101000867860 Homo sapiens Carbonic anhydrase 13 Proteins 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005949 ozonolysis reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Activated Sludge Processes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排水の高度処理方
法及び高度処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an advanced treatment method for wastewater and an advanced treatment apparatus.
【０００２】[0002]
【従来技術】工場排水、生活排水等の排水は、従来より
活性汚泥法に代表される生物処理方法によって処理され
ている。活性汚泥法は、ランニングコストの面では有利
であるものの、微生物の分解能力に依存するという弱点
がある。このため、排水中の難分解性の有機物を処理す
ることができず、処理水に有機物が残存した状態とな
る。このような処理水は、ＢＯＤ値を５ｍｇ／Ｌ以下に
低減できても、ＣＯＤ値が２０〜５０ｍｇ／Ｌと高く、
環境保全という点は十分なものとは言えない。2. Description of the Related Art Wastewater such as factory wastewater and domestic wastewater has been conventionally treated by a biological treatment method represented by an activated sludge method. Although the activated sludge method is advantageous in terms of running cost, it has a weak point that it depends on the ability to decompose microorganisms. For this reason, the hardly decomposable organic matter in the wastewater cannot be treated, and the treated matter remains in the treated water. Such treated water has a high COD value of 20 to 50 mg / L even if the BOD value can be reduced to 5 mg / L or less,
Environmental protection is not enough.
【０００３】この場合、後段の高度処理方法としてオゾ
ンで酸化する方法があるが、それは脱色を目的とするも
のにすぎず、ＣＯＤ値の低減効果は２〜３割程度であ
り、未だ満足できる数値ではない。In this case, there is a method of oxidizing with ozone as a high-level treatment method in the latter stage, but it is only for decolorization, and the COD value reducing effect is about 20 to 30%, which is still a satisfactory value. is not.
【０００４】また、活性炭を用いる方法もあるが、活性
炭により排水を処理できる量は少なく、実用的でない。
例えば、排水１ｋｇを処理しようとすれば５０ｇの活性
炭が必要となるため、活性炭を頻繁に交換しなければな
らず、維持費が高くなる。また、たとえ十分な量の活性
炭を用いたとしても、残留ＣＯＤ成分に対する活性炭の
吸着能力が不十分であり、所望のＣＯＤ低減効果は期待
できない。There is also a method of using activated carbon, but the amount of wastewater that can be treated by activated carbon is small and it is not practical.
For example, if 1 kg of waste water is to be treated, 50 g of activated carbon is required, so the activated carbon must be replaced frequently, which increases maintenance costs. Further, even if a sufficient amount of activated carbon is used, the adsorbing ability of the activated carbon to the residual COD component is insufficient, and the desired COD reduction effect cannot be expected.
【０００５】[0005]
【発明が解決しようとする課題】これに対し、オゾン処
理部と粒状濾材充填層からなる処理工程を複数段配列さ
せ、処理対象水をオゾン処理部と粒状濾材充填層の順に
交互に流通させてオゾン処理→生物処理→を複数段繰り
返して行うことを特徴とする水の浄化方法が知られてい
る（特開平５−８４５００号）。On the other hand, a plurality of stages of treatment steps consisting of an ozone treatment section and a granular filter medium packing layer are arranged, and the water to be treated is alternately passed through the ozone treatment section and the granular filter medium packed layer in this order. There is known a water purification method characterized in that ozone treatment → biological treatment → is repeatedly performed in a plurality of stages (JP-A-5-84500).
【０００６】しかし、この方法では、オゾンによるＣＯ
Ｄ低減効果はせいぜい２０〜３０％程度にとどまり、そ
れ以上の効果は期待できない。However, in this method, ozone-based CO
The D reduction effect is at most about 20 to 30%, and no further effect can be expected.
【０００７】原水導入部及び処理水排出部を備える生物
処理手段と、該生物処理手段から排出される処理水の一
部を該原水導入部に循環する循環手段とを備える排水処
理装置において、該循環手段又は処理水排出部に、難生
物分解性のＣＯＤ成分を物理化学的に酸化するための酸
化処理手段を設けたことを特徴とする排水処理装置が提
案されている（特開平９−７０５９７号）。In a wastewater treatment apparatus comprising a biological treatment means having a raw water introduction part and a treated water discharge part, and a circulation means for circulating a part of the treated water discharged from the biological treatment means to the raw water introduction part, There has been proposed a wastewater treatment device characterized in that the circulation means or the treated water discharge part is provided with an oxidation treatment means for physicochemically oxidizing the COD component which is hardly biodegradable (JP-A-9-70597). issue).
【０００８】しかし、かかる排水処理装置では、処理水
の一部を酸化処理して原水に返送する循環率を大きくし
ようとすると、生物処理槽を大きくしなければならなく
なり、コストの上昇につながる。また、その循環率を小
さくすると、オゾン酸化処理されない排水の比率が高く
なるため、オゾン酸化による効果が低減するという問題
がある。However, in such a waste water treatment apparatus, if it is attempted to increase the circulation rate for oxidizing a part of the treated water and returning it to the raw water, the biological treatment tank must be enlarged, which leads to an increase in cost. Further, if the circulation rate is reduced, the ratio of wastewater that is not subjected to ozone oxidation treatment increases, so that there is a problem that the effect of ozone oxidation decreases.
【０００９】被処理排水をオゾンと向流接触させた後、
生物処理する方法において、オゾンと接触した後のオゾ
ン処理水に、前記被処理排水の一部を添加することを特
徴とする排水の処理方法が知られている（特開平６−９
１２９９号）。After the treated wastewater is brought into countercurrent contact with ozone,
In the method of biological treatment, there is known a wastewater treatment method characterized by adding a part of the wastewater to be treated to ozone-treated water after contact with ozone (Japanese Patent Laid-Open No. 6-9).
1299).
【００１０】しかし、この処理方法においては、オゾン
酸化後の処理水中に残留するオゾンを分解する目的で、
オゾン酸化を受けない原水の一部とオゾン酸化後の処理
水を混合することを前提としてるため、オゾン酸化を受
けない原水は十分なオゾン酸化が受けられないという欠
点がある。However, in this treatment method, for the purpose of decomposing the ozone remaining in the treated water after ozone oxidation,
Since it is premised that a part of the raw water that does not undergo ozone oxidation and the treated water after ozone oxidation are mixed, there is a drawback that raw water that does not undergo ozone oxidation cannot undergo sufficient ozone oxidation.
【００１１】このように、いずれの装置又は方法におい
ても、低コストで効率的に排水のＣＯＤ及びＴＯＣを低
減させるためにはさらなる技術改良が必要である。As described above, in any of the devices or methods, further technical improvement is required in order to reduce COD and TOC of wastewater efficiently at low cost.
【００１２】従って、本発明の主な目的は、より効率的
に排水のＣＯＤ及びＴＯＣをともに低減させる方法及び
装置を提供することにある。Therefore, a main object of the present invention is to provide a method and apparatus for more efficiently reducing both COD and TOC of waste water.
【００１３】[0013]
【課題を解決するための手段】本発明者は、かかる従来
技術の問題点に鑑みて鋭意研究を重ねた結果、特定の工
程からなる方法により上記目的を達成できることを見出
し、ついに本発明を完成するに至った。As a result of intensive studies in view of the problems of the prior art, the present inventor has found that the above object can be achieved by a method consisting of specific steps, and finally completed the present invention. Came to do.
【００１４】すなわち、本発明は、下記の排水の高度処
理方法及び高度処理装置に係る。That is, the present invention relates to the following advanced treatment method and device for wastewater.
【００１５】１．（１）排水にオゾンガスを注入してオ
ゾン処理を行う第一工程、（２）オゾン処理された処理
水を生物処理する第二工程及び（３）生物処理された処
理水にオゾンガスを注入してオゾン処理を行う第三工程
を有することを特徴とする排水の高度処理方法。1. (1) First step of injecting ozone gas into waste water for ozone treatment, (2) Second step of biological treatment of ozone-treated water, and (3) Injecting ozone gas into biological treatment water. An advanced method for treating wastewater, comprising a third step of performing ozone treatment.
【００１６】２．第一工程の排水のＣＯＤが２５ｍｇ／
Ｌ以上である前記項１記載の高度処理方法。2. COD of wastewater in the first step is 25 mg /
2. The advanced processing method according to item 1, which is L or more.
【００１７】３．第一工程及び第三工程の少なくとも一
方の工程における排水及び／又は処理水のｐＨを７．５
以上とする前記項１又は２に記載の高度処理方法。3. The pH of the wastewater and / or the treated water in at least one of the first step and the third step is 7.5.
The advanced processing method described in 1 or 2 above.
【００１８】４．オゾン処理が、第一工程及び第二工程
のみで行われる前記項１〜３のいずれかに記載の高度処
理方法。4. 4. The advanced treatment method according to any one of Items 1 to 3, wherein the ozone treatment is performed only in the first step and the second step.
【００１９】５．（１）排水にオゾンガスを注入してオ
ゾン処理を行う第一次オゾン反応槽、（２）オゾン処理
された処理水を生物処理する生物処理槽及び（３）生物
処理された処理水にオゾンガスを注入してオゾン処理を
行う第二次オゾン反応槽を有し、オゾン反応槽としては
上記第一次オゾン反応槽及び第二次オゾン反応槽のみで
あることを特徴とする排水の高度処理装置。5. (1) A primary ozone reaction tank for injecting ozone gas into wastewater for ozone treatment, (2) biological treatment tank for biological treatment of ozone-treated treated water, and (3) ozone gas for biologically treated water. An advanced treatment device for wastewater, comprising a secondary ozone reaction tank for injecting and performing ozone treatment, and the ozone reaction tank is only the above-mentioned primary ozone reaction tank and secondary ozone reaction tank.
【００２０】６．内部が第一次オゾン反応槽、生物処理
槽及び第二次オゾン反応槽に区画されたタンクを有する
排水処理装置であって、２つの仕切板がタンク中に設置
され、各仕切板はタンク底部からタンク天井に向かって
延びており、この２つの仕切板が第一次オゾン反応槽、
生物処理槽及び第二次オゾン反応槽に区画し、各反応槽
で処理された処理水が各仕切板を越えて隣接する反応槽
に順に流れるように仕切板とタンク天井との間に隙間が
設けられ、オゾンガス及び排水を含む混合液が導入でき
る導入口が第一次オゾン反応槽に設置され、第二次オゾ
ン反応槽での処理が完了した処理完了水を外部に送り出
すための排出口が第二次オゾン反応槽に設けられてい
る、ことを特徴とする排水の高度処理装置。6. A wastewater treatment device having a tank whose interior is divided into a primary ozone reaction tank, a biological treatment tank, and a secondary ozone reaction tank, in which two partition plates are installed in the tank, and each partition plate is the bottom of the tank. Extending toward the tank ceiling, these two partition plates are the primary ozone reaction tank,
A space is provided between the partition plate and the tank ceiling so that the water is divided into the biological treatment tank and the secondary ozone reaction tank, and the treated water treated in each reaction tank flows over each partition plate to the adjacent reaction tank in order. An inlet for the mixed liquid containing ozone gas and waste water is installed in the primary ozone reaction tank, and an outlet for sending out the treatment-completed water that has been treated in the secondary ozone reaction tank to the outside. An advanced wastewater treatment device, which is provided in a secondary ozone reaction tank.
【００２１】[0021]
【発明の実施の形態】１．排水の高度処理方法
本発明の排水の高度処理方法は、（１）排水にオゾンガ
スを注入してオゾン処理（第一次オゾン処理）を行う第
一工程、（２）第一次オゾン処理された処理水を生物処
理する第二工程及び（３）生物処理された処理水にオゾ
ンガスを注入してオゾン処理（第二次オゾン処理）を行
う第三工程を有することを特徴とする。
（１）第一工程
第一工程では、排水にオゾンガスを注入して第一次オゾ
ン処理を行う。本発明では、排水（原水）としては、工
場排水、生活排水等のいずれにも適用できる。例えば、
生活排水と工場排水を含む排水を一次処理（活性汚泥処
理）されたものを本発明の排水として適用できる。特
に、本発明方法は、ＣＯＤが２０ｐｐｍ以上、好ましく
は２５ｐｐｍ以上、より好ましくは２５〜３０ｐｐｍの
排水に好適である。BEST MODE FOR CARRYING OUT THE INVENTION 1. Advanced treatment method for wastewater The advanced treatment method for wastewater of the present invention is (1) a first step of injecting ozone gas into wastewater to perform ozone treatment (primary ozone treatment), and (2) primary ozone treatment. It is characterized by having a second step of biologically treating the treated water and (3) a third step of injecting ozone gas into the biologically treated treated water to perform ozone treatment (secondary ozone treatment). (1) First Step In the first step, ozone gas is injected into the waste water to perform the first ozone treatment. In the present invention, the wastewater (raw water) can be applied to both factory wastewater and domestic wastewater. For example,
Wastewater including domestic wastewater and factory wastewater that has undergone primary treatment (activated sludge treatment) can be applied as the wastewater of the present invention. In particular, the method of the present invention is suitable for wastewater having a COD of 20 ppm or higher, preferably 25 ppm or higher, more preferably 25 to 30 ppm.
【００２２】オゾンガスは、放電法によるオゾンガス、
電解法によるオゾンガス等のいずれも使用することがで
きる。これらは、公知のオゾン発生装置で生成させるこ
とができる。排水に注入するオゾンガスのオゾン濃度は
限定的ではないが、通常は２０〜２００ｇ／ｍ3程度と
すれば良い。Ozone gas is ozone gas produced by a discharge method,
Any of ozone gas produced by the electrolysis method can be used. These can be generated by a known ozone generator. Although the ozone concentration of the ozone gas injected into the waste water is not limited, it is usually about 20 to 200 g / m 3 .
【００２３】オゾンガスの注入方法は特に限定されず、
例えばエジェクタによる混合、散気管等によるバブリン
グ等の公知の方法に従って行うことができる。オゾンガ
スの注入量は、処理すべき排水の種類、排水の流量等に
応じて適宜設定すれば良いが、通常は５〜５０ｍｇ／ｈ
程度の範囲内とすれば良い。The method of injecting ozone gas is not particularly limited,
For example, mixing can be performed by a known method such as mixing with an ejector and bubbling with an air diffuser. The injection amount of ozone gas may be appropriately set according to the type of wastewater to be treated, the flow rate of the wastewater, etc., but normally 5 to 50 mg / h
It may be set within the range.
【００２４】本発明では、排水及び／又は処理水のｐＨ
を７．５以上、特に８以上に設定することが望ましい。
このようなｐＨ調整を行うことによって、オゾン処理を
より効果的に行うことができる。また、かかるｐＨ調整
により、残留オゾンの自己分解を促進させることもでき
るため、次工程の生物処理層への残留オゾンの混入をよ
り確実に抑制ないしは防止できる。その結果、特にオゾ
ン分解処理を施さなくても生物処理をより有効に行うこ
とができる。ｐＨ調整は、例えば水酸化ナトリウム（苛
性ソーダ）、水酸化カリウム等のアルカリを使用すれば
良い。これらは、そのまま又は水溶液の形態で添加する
ことができる。これらアルカリの添加量、添加方法等
は、排水の種類・処理量、装置の形式等に応じて適宜決
定することができる。
（２）第二工程
第二工程では、第一次オゾン処理された処理水を生物処
理する。生物処理の方法は、生物分解反応によってＴＯ
Ｃの低減効果が得られる限り特に限定されず、公知の生
物処理方法・操作条件に従って行えば良い。例えば、公
知の生物反応槽（生物分解槽）を用いることにより実施
できる。生物反応槽では、多孔質材料を充填した充填層
に処理水を流通させることによって生物処理が行われ
る。多孔質材料（材質）としては、例えばセラミック
ス、樹脂類等を挙げることができる。多孔質材料の形状
は限定的でなく、例えば粒状（ボール状）、管状、ひも
状等の各種の形態から材質等に応じて適宜選ぶことがで
きる。In the present invention, the pH of waste water and / or treated water is
Is preferably set to 7.5 or more, and particularly set to 8 or more.
By performing such pH adjustment, ozone treatment can be performed more effectively. Further, since the self-decomposition of residual ozone can be promoted by such pH adjustment, it is possible to more reliably suppress or prevent the mixture of residual ozone into the biological treatment layer in the next step. As a result, the biological treatment can be more effectively performed without the ozone decomposition treatment. The pH may be adjusted by using an alkali such as sodium hydroxide (caustic soda) or potassium hydroxide. These can be added as they are or in the form of an aqueous solution. The amount and method of addition of these alkalis can be appropriately determined according to the type and treatment amount of waste water, the type of equipment, and the like. (2) Second step In the second step, the treated water subjected to the primary ozone treatment is biologically treated. The method of biological treatment is TO
The method is not particularly limited as long as the effect of reducing C is obtained, and may be performed according to known biological treatment methods and operating conditions. For example, it can be carried out by using a known biological reaction tank (biodegradation tank). In the biological reaction tank, biological treatment is performed by circulating treated water through a packed bed filled with a porous material. Examples of the porous material (material) include ceramics and resins. The shape of the porous material is not limited, and can be appropriately selected from various forms such as granular (ball-like), tubular, and string-like depending on the material and the like.
【００２５】第二工程では、必要に応じて生物反応槽中
の処理水が充填層を効率的に通過できるように循環させ
ることが好ましい。例えば、生物反応槽の底部近辺にバ
ブリング装置を設置し、空気等を供給することによって
実施することができる。
（３）第三工程
第三工程では、生物処理された処理水にオゾンガスを注
入して第二次オゾン処理を行う。第二次オゾン処理は、
第一次オゾン処理と同様にすれば良い。In the second step, it is preferable to circulate the treated water in the biological reaction tank so that the treated water can efficiently pass through the packed bed, if necessary. For example, it can be carried out by installing a bubbling device near the bottom of the biological reaction tank and supplying air or the like. (3) Third step In the third step, ozone gas is injected into the biologically treated water to perform the second ozone treatment. The second ozone treatment is
It may be performed in the same manner as the first ozone treatment.
【００２６】第三工程においても、第一工程と同様、処
理水のｐＨを７．５以上、特に８以上に設定することが
望ましい。かかるｐＨ調整により、オゾン処理をより効
果的に行うことができる。第三工程を終了した後、所定
の処理完了水が得られる。In the third step as well, as in the first step, it is desirable to set the pH of the treated water to 7.5 or higher, especially 8 or higher. Ozone treatment can be performed more effectively by such pH adjustment. After completing the third step, a predetermined amount of treated water is obtained.
【００２７】本発明の高度処理方法で得られる処理完了
水は、導入する排水の種類、状態等にもよるが、条件に
よってはＣＯＤ８ｐｐｍ以下（好ましくは７ｐｐｍ以
下）、ＴＯＣ１５ｐｐｍ以下（好ましくは１０ｐｐｍ以
下）まで低減させることができる。特に、ＣＯＤを導入
する排水の６０％以上（好ましくは７０％以上）もカッ
トすることが可能である。
２．排水の高度処理装置
本発明の排水の高度処理装置は、（１）排水にオゾンガ
スを注入してオゾン処理を行う第一次オゾン反応槽、
（２）オゾン処理された処理水を生物処理する生物処理
槽及び（３）生物処理された処理水にオゾンガスを注入
してオゾン処理を行う第二次オゾン反応槽を有し、オゾ
ン反応槽としては上記第一次オゾン反応槽及び第二次オ
ゾン反応槽のみであることを特徴とする。The treatment-completed water obtained by the advanced treatment method of the present invention depends on the type and condition of the introduced wastewater, but depending on the conditions, COD is 8 ppm or less (preferably 7 ppm or less), TOC is 15 ppm or less (preferably 10 ppm or less). Can be reduced to In particular, it is possible to cut 60% or more (preferably 70% or more) of the wastewater introduced with COD. 2. Advanced treatment equipment for wastewater The advanced treatment equipment for wastewater of the present invention comprises (1) a primary ozone reaction tank for performing ozone treatment by injecting ozone gas into wastewater,
(2) A biological treatment tank for biologically treating treated water subjected to ozone treatment, and (3) A secondary ozone reaction tank for performing ozone treatment by injecting ozone gas into the treated water for biological treatment, Is characterized by only the above-mentioned primary ozone reaction tank and secondary ozone reaction tank.
【００２８】本発明装置では、オゾン反応槽としては上
記第一次オゾン反応槽及び第二次オゾン反応槽のみであ
り、これら以外のオゾン反応槽を必要としない。In the apparatus of the present invention, the ozone reaction tank is only the above-mentioned primary ozone reaction tank and secondary ozone reaction tank, and no ozone reaction tank other than these is required.
【００２９】また、本発明装置は、第一次オゾン反応
槽、生物処理槽及び第二次オゾン反応槽は、別々に構成
されていても良いし、後記の実施例にも示すように一体
的に構成されていても良い。各反応槽を別々に構成する
場合は、各反応槽を配管等で接続すれば良い。また、各
反応槽を一体的に構成する場合は、例えば１つの容器に
仕切板（隔壁）を設けて３つに区画し、それぞれを順に
第一次オゾン反応槽、生物処理槽及び第二次オゾン反応
槽とすれば良い。各反応槽で処理された処理水は、例え
ば仕切板を越えて隣接する反応槽に順に流れ込めるよう
に設計すれば良い。また、さらに未溶解オゾンガスが隣
接する反応槽に混入しないように別の仕切板を設けるこ
ともできる。Further, in the apparatus of the present invention, the primary ozone reaction tank, the biological treatment tank and the secondary ozone reaction tank may be constructed separately, or they may be integrated as shown in Examples below. It may be configured to. When each reaction tank is configured separately, each reaction tank may be connected by a pipe or the like. Moreover, when each reaction tank is integrally configured, for example, a partition plate (partition wall) is provided in one container and divided into three, and each of them is in turn a primary ozone reaction tank, a biological treatment tank, and a secondary tank. It may be an ozone reaction tank. The treated water treated in each reaction tank may be designed so that it can flow into the adjacent reaction tanks in order over the partition plate. Further, another partition plate may be provided so that the undissolved ozone gas is not mixed into the adjacent reaction tank.
【００３０】第一次オゾン反応槽は、排水とオゾンガス
を含む混合水をオゾン処理するものである。反応槽の形
式は排水とオゾンガスとのオゾン反応をさせることがで
きれば特に制限されない。従って、排水にオゾンガスを
導入する地点も、反応槽中に直接導入する方式であって
も良いし、あるいは排水に予めオゾンガスを導入した
後、得られた混合液を反応槽に送り込む方式であって良
い。前者の方式の場合は、例えば排水を送り込む配管が
反応槽に設置され、オゾンガスを放出する散気管を反応
槽内部に備えた構成を採用することができる。後者の場
合は、例えばオゾンガスを導入するためのエジェクタ等
が排水用配管に設置され、そこで排水に導入されたオゾ
ンガスとの混合液を導入できるように上記配管が反応槽
に接続された構成を採ることができる。また、後者の場
合には、上記混合液を反応槽に送り込むためのポンプを
設置することもできる。The primary ozone reaction tank treats waste water and mixed water containing ozone gas with ozone. The type of the reaction tank is not particularly limited as long as the ozone reaction between the waste water and ozone gas can be carried out. Therefore, the point of introducing ozone gas into the wastewater may be a method of directly introducing it into the reaction tank, or a method of introducing ozone gas into the wastewater in advance and then sending the obtained mixed liquid to the reaction tank. good. In the case of the former method, for example, a configuration in which a pipe for feeding waste water is installed in the reaction tank and a diffuser pipe for discharging ozone gas is provided inside the reaction tank can be adopted. In the latter case, for example, an ejector or the like for introducing ozone gas is installed in the drainage pipe, and the pipe is connected to the reaction tank so that a mixed liquid with the ozone gas introduced into the drainage can be introduced therein. be able to. In the latter case, a pump for feeding the mixed solution into the reaction tank can be installed.
【００３１】また、第一次オゾン反応槽には、必要に応
じて未溶解オゾンガスを排気するための排気口を設ける
こともできる。排気口は、第一次オゾン反応槽の上部
（頂部）に設置することが望ましい。If necessary, the primary ozone reaction tank may be provided with an exhaust port for exhausting undissolved ozone gas. The exhaust port is preferably installed in the upper part (top part) of the primary ozone reaction tank.
【００３２】生物処理槽は、公知の生物処理槽又は生物
反応槽と同様の形式を採用することができる。例えば、
反応槽中に充填層が備え付けられた方式が好ましい。充
填層には、前記１．で示したような多孔質材料が充填さ
れている。The biological treatment tank may be of the same type as a known biological treatment tank or biological reaction tank. For example,
A system in which a packed bed is provided in the reaction tank is preferable. The packing layer contains 1. It is filled with a porous material as shown in.
【００３３】生物処理槽は、そこに導入された排水が充
填層中を確実に通過できるように、バブリング装置等を
設けて生物処理槽中で排水が循環できるようにすること
が望ましい。バブリング装置では、例えば空気を送り込
むことが好ましい。空気をバブリングすることによっ
て、上記循環をより効果的に行うことができるほか、微
生物による有機物の分解を促進させることが可能とな
る。The biological treatment tank is preferably provided with a bubbling device or the like so that the wastewater introduced therein can pass through the packed bed so that the wastewater can circulate in the biological treatment tank. In the bubbling device, it is preferable to send air, for example. By bubbling air, the circulation can be performed more effectively, and the decomposition of organic substances by microorganisms can be promoted.
【００３４】第二次オゾン反応槽は、生物処理槽を経た
処理水とオゾンガスを含む処理水のオゾン反応を行わせ
るものである。反応槽の形式は処理水とオゾンガスとを
反応させることができれば特に制限されず、前記の第一
次オゾン反応槽と同様の構成を採用することができる。The secondary ozone reaction tank causes the ozone reaction of the treated water that has passed through the biological treatment tank and the treated water containing ozone gas. The type of the reaction tank is not particularly limited as long as the treated water and ozone gas can be reacted, and the same configuration as the above-mentioned primary ozone reaction tank can be adopted.
【００３５】また、第一次オゾン反応槽と同様、第二次
オゾン反応槽にも、必要に応じて未溶解オゾンガスを排
気するための排気口を設けることもできる。排気口は、
第二次オゾン反応槽の上部（頂部）に設置することが望
ましい。Further, like the primary ozone reaction tank, the secondary ozone reaction tank may be provided with an exhaust port for exhausting undissolved ozone gas, if necessary. The exhaust port is
It is desirable to install it in the upper part (top part) of the secondary ozone reaction tank.
【００３６】第二次オゾン反応槽には、処理完了水を送
り出すための配管、さらに必要により配管にポンプを設
置する。In the secondary ozone reaction tank, a pipe for sending out treatment-completed water, and if necessary, a pump is installed in the pipe.
【００３７】[0037]
【発明の効果】本発明によれば、より簡便な方法で効果
的に排水のＣＯＤ及びＴＯＣをともに低減させることが
できる。According to the present invention, both COD and TOC of waste water can be effectively reduced by a simpler method.
【００３８】本発明では、オゾン反応処理工程（オゾン
反応槽）を２回実施するだけで、排水のＣＯＤを効果的
に低減することができる。特に、ＣＯＤが２５ｍｇ／Ｌ
以上という高濃度ＣＯＤ排水を効果的に処理することが
できる。In the present invention, the COD of the waste water can be effectively reduced by performing the ozone reaction treatment step (ozone reaction tank) only twice. Especially, COD is 25mg / L
The high-concentration COD wastewater described above can be effectively treated.
【００３９】また、従来技術と異なり、オゾン反応槽及
び生物反応槽を多数繰り返して設置する必要がなく、あ
るいは系全体を循環させる必要等もないため、工程又は
装置を簡略化することができる結果、処理能力の向上を
図ることができる。Further, unlike the prior art, it is not necessary to repeatedly install a large number of ozone reaction tanks and biological reaction tanks, or it is not necessary to circulate the entire system, so that the process or apparatus can be simplified. Therefore, the processing capacity can be improved.
【００４０】特に、本発明方法においては、第一工程及
び第三工程の少なくとも一方の工程における排水及び／
又は処理水のｐＨを７．５以上に制御する場合には、オ
ゾン処理を効果的に行うことができる。さらに、残留オ
ゾンの自己分解を促進させることもできる結果、特別の
オゾン分解を施さなくても生物処理をいっそう効果的に
実施することができる。In particular, in the method of the present invention, drainage and / or drainage in at least one of the first step and the third step
Alternatively, when the pH of the treated water is controlled to 7.5 or higher, the ozone treatment can be effectively performed. Furthermore, as a result of being able to promote self-decomposition of residual ozone, biological treatment can be carried out more effectively without special ozonolysis.
【００４１】[0041]
【実施例】以下に実施例を示し、本発明の特徴を一層明
確にする。但し、本発明の範囲は、実施例の範囲に限定
されるものではない。EXAMPLES Examples will be shown below to further clarify the characteristics of the present invention. However, the scope of the present invention is not limited to the scope of the embodiments.
【００４２】実施例１
（１）排水処理装置
図１に示すような排水処理装置で原水の排水処理を実施
した。この排水処理装置（１）は、第一次オゾン反応槽
（２）、生物反応槽（３）及び第二次オゾン反応槽
（４）を基本構成とし、これらが一体的に構成されてい
る。この装置は、タンク（５）中に２つの仕切板（６）
（７）により３つに区分されている。各仕切板はタンク
底部からタンク天井に向かってほぼ垂直に設けられてい
る。タンク天井部においては、各反応槽で処理された排
水が乗り越えられるように、タンク天井部と各仕切板
（６）（７）との間に隙間がそれぞれ設けられている。Example 1 (1) Wastewater treatment equipment The wastewater treatment equipment shown in FIG. 1 was used to perform wastewater treatment of raw water. This wastewater treatment device (1) has a primary ozone reaction tank (2), a biological reaction tank (3), and a secondary ozone reaction tank (4) as a basic configuration, and these are integrally configured. This device has two partition plates (6) in the tank (5).
It is divided into three by (7). Each partition plate is provided almost vertically from the tank bottom to the tank ceiling. In the tank ceiling, gaps are provided between the tank ceiling and the partition plates (6) and (7) so that the wastewater treated in each reaction tank can be overcome.
【００４３】第一次オゾン反応槽には、オゾンガス及び
排水の混合液の導入口（８）と、混合液を排水が流れる
配管に循環させるために反応槽から取水する取水口
（９）とが設置されている。オゾンガスの導入は、排水
用配管の途中に設置されたエジェクタ（図示せず）によ
って実施される。オゾンガスが排水に導入された後の混
合液は、第一次オゾン反応槽の底部付近に送り込めるよ
うにポンプ（１０）が設けられている。第一次オゾン反
応槽の天井部には未溶解オゾンガスを排出するための排
気口（１１）を設置している。仕切板（１２）（１３）
は、オゾン反応槽（気相部）における未反応オゾンガス
（未溶解オゾンガス）を生物反応槽から隔離しながら取
り出すために設けられている。The primary ozone reaction tank has an inlet (8) for a mixture of ozone gas and waste water, and an intake (9) for taking water from the reaction tank to circulate the mixture in a pipe through which the waste water flows. is set up. The ozone gas is introduced by an ejector (not shown) installed in the middle of the drainage pipe. A pump (10) is provided so that the mixed liquid after the ozone gas is introduced into the wastewater can be sent to the vicinity of the bottom of the primary ozone reaction tank. An exhaust port (11) for discharging undissolved ozone gas is installed on the ceiling of the primary ozone reaction tank. Partition plate (12) (13)
Is provided for separating unreacted ozone gas (undissolved ozone gas) in the ozone reaction tank (gas phase portion) from the biological reaction tank while separating it.
【００４４】生物反応槽（生物処理槽）には、充填層
（１４）が備え付けられており、充填層中には多孔質セ
ラミックス製ボール（図示せず）が複数装填されてい
る。また、生物反応槽中で排水を循環させて充填層中を
通過できるようにバブリング装置（１５）が生物反応槽
の底部付近に設置されている。バブリング装置には、配
管等を通じて空気が送り込まれる。The biological reaction tank (biological treatment tank) is provided with a packed bed (14), and a plurality of porous ceramic balls (not shown) are loaded in the packed bed. Further, a bubbling device (15) is installed near the bottom of the biological reaction tank so that waste water can be circulated in the biological reaction tank and passed through the packed bed. Air is sent to the bubbling device through piping or the like.
【００４５】第二次オゾン反応槽には、オゾンガスをさ
らに注入するために反応槽から処理水を取り出す取水口
（１６）と、オゾンガスを注入した後の処理水を反応槽
に戻すための導入口（１７）とが設置されている。オゾ
ンガスの導入は、取水口に接続された配管の途中に設置
されたエジェクタ（図示せず）によって実施される。オ
ゾンガスが処理水に導入された後の混合液は、第二次オ
ゾン反応槽の上部付近に送り込めるようにポンプ（１
８）が設けられている。第二次オゾン反応槽の天井部に
は未溶解オゾンガスを排出するための排気口（１９）が
設置されている。仕切板（２０）（２１）は、オゾン反
応槽（気相部）における未反応オゾンガス（未溶解オゾ
ンガス）を生物反応槽から隔離しながら取り出すために
設けられている。
（２）高度排水処理
上記のような排水処理装置を用いて排水（原水）の高度
排水処理を実施した。原水としては、し尿及び生活雑排
水を含む排水を合併処理槽で処理（一次処理）されたも
のを使用した。原水は、２０リットル／ｈｒの割合で導
入され、エジェクタを介してオゾンガスが注入された
後、ポンプにより第一次オゾン反応槽に送られる。上記
オゾンガスは、４００ｍｇ／ｈｒで原水に注入される
（オゾン注入率：２０ｐｐｍ）。The secondary ozone reaction tank has a water intake (16) for taking out treated water from the reaction tank for further injecting ozone gas, and an inlet for returning the treated water after injecting ozone gas to the reaction tank. (17) and are installed. The introduction of ozone gas is performed by an ejector (not shown) installed in the middle of a pipe connected to the water intake. The mixed solution after the ozone gas is introduced into the treated water is pumped (1) so that it can be sent near the upper part of the secondary ozone reaction tank.
8) is provided. An exhaust port (19) for discharging undissolved ozone gas is installed on the ceiling of the secondary ozone reaction tank. The partition plates (20) and (21) are provided to take out unreacted ozone gas (undissolved ozone gas) in the ozone reaction tank (gas phase portion) while separating it from the biological reaction tank. (2) Advanced wastewater treatment Advanced wastewater treatment of wastewater (raw water) was carried out using the above-mentioned wastewater treatment equipment. As raw water, wastewater containing human waste and household wastewater was treated (primary treatment) in the combined treatment tank. Raw water is introduced at a rate of 20 liters / hr, ozone gas is injected through an ejector, and then pumped to the primary ozone reaction tank. The ozone gas is injected into raw water at 400 mg / hr (ozone injection rate: 20 ppm).
【００４６】オゾンガスは、純水を電解して得られるオ
ゾンガス（濃度：２００ｇ／ｍ3）を用いた。また、ポ
ンプとしては、送水能力６０リットル／ｈｒであり、耐
オゾン性のあるステンレス鋼製であり、シール部がフッ
素樹脂からなるものを用いた。As the ozone gas, ozone gas obtained by electrolyzing pure water (concentration: 200 g / m 3 ) was used. Further, as the pump, a pump made of stainless steel having a water supply capacity of 60 liters / hr and having ozone resistance and having a sealing portion made of a fluororesin was used.
【００４７】本実施例では、原水に苛性ソーダを約７０
ｐｐｍ注入することにより、第一オゾン反応槽の入口で
の原水のｐＨを約９付近になるように調整した。In this example, ca. 70 of caustic soda was added to the raw water.
By injecting ppm, the pH of the raw water at the inlet of the first ozone reaction tank was adjusted to be around 9.
【００４８】第一次オゾン反応槽では、オゾンとの反応
による処理が進行し、ＣＯＤ及びＴＯＣの低減が図られ
る。第一次オゾン反応槽で処理された後の第一次オゾン
処理水のＣＯＤ及びＴＯＣを表１に示す。In the primary ozone reaction tank, the treatment by the reaction with ozone proceeds to reduce COD and TOC. Table 1 shows COD and TOC of the primary ozone-treated water after being treated in the primary ozone reaction tank.
【００４９】[0049]
【表１】 [Table 1]
【００５０】次いで、第一オゾン処理水は、第一オゾン
反応槽の仕切板（堰）を越えて生物処理層（生物分解
槽）に入る。生物処理槽の充填層には、直径が約１０ｍ
ｍの多孔質セラミックスボールが約２０リットル充填さ
れている。また、生物処理槽の底部にバブリング装置を
設け、そこから空気をバブリングすることにより、酸素
を供給するとともに、処理水が充填部を通過するように
循環させた。なお、第一オゾン処理水のｐＨは、生物分
解槽に入るとｐＨ８となった。生物分解槽で処理された
処理水のＴＯＣ及びＣＯＤを表１に示す。Next, the first ozone-treated water passes through the partition plate (weir) of the first ozone reaction tank and enters the biological treatment layer (biodegradation tank). The packed bed of the biological treatment tank has a diameter of about 10 m.
About 20 liters of porous ceramic balls of m are filled. Further, a bubbling device was provided at the bottom of the biological treatment tank, and air was bubbled from the bubbling device to supply oxygen and circulate the treated water so as to pass through the filling part. The pH of the first ozone-treated water became pH 8 when entering the biodegradation tank. Table 1 shows TOC and COD of the treated water treated in the biodegradation tank.
【００５１】生物分解槽での処理を終えた処理水は、仕
切板を越えて第二オゾン反応槽に流れる。第二オゾン反
応槽では、取水口から取水された上記処理水にオゾンガ
スが注入され、再び第二オゾン反応槽に戻される。ここ
でのオゾンガス注入量は、２００ｍｇ／ｈｒとした（オ
ゾン注入率：１０ｐｐｍ）。また、第二オゾン処理槽で
は、苛性ソーダの注入は行わなかった。このように上記
処理水を循環させながらオゾンとの反応により処理を行
う。第二オゾン処理水のＴＯＣ及びＣＯＤを表１に示
す。第二オゾン反応槽でオゾン処理された第二オゾン処
理水（処理完了水）は、配管、ポンプ等を通じてユース
ポイント等に送り出される。The treated water, which has been treated in the biodegradation tank, flows over the partition plate into the second ozone reaction tank. In the second ozone reaction tank, ozone gas is injected into the treated water taken from the water intake port and returned to the second ozone reaction tank again. The amount of ozone gas injected here was 200 mg / hr (ozone injection rate: 10 ppm). In addition, caustic soda was not injected in the second ozone treatment tank. Thus, the treatment is performed by the reaction with ozone while circulating the treated water. Table 1 shows TOC and COD of the second ozone-treated water. The second ozone-treated water (treatment-completed water) that has been subjected to ozone treatment in the second ozone reaction tank is sent to a use point or the like through a pipe, a pump, or the like.
【００５２】表１に示すように、原水をオゾン酸化した
だけではＣＯＤが十分に低下しないが、生物処理槽で処
理するとＴＯＣは原水の５０％まで低下し、有機物が良
く分解されていることがわかる。ところが、生物分解処
理後のＣＯＤは原水のＣＯＤの値に戻っている。この理
由は未だ解明されていない。これに対し、さらなるオゾ
ン処理として第二オゾン反応槽で処理することにより、
ＴＯＣはもとより、ＣＯＤを７ｐｐｍ（原水の７０％の
ＣＯＤをカット）と大幅に低減できることがわかる。As shown in Table 1, COD is not sufficiently reduced by simply oxidizing the raw water with ozone, but when treated in a biological treatment tank, TOC is reduced to 50% of the raw water, and organic matter is well decomposed. Recognize. However, the COD after the biodegradation treatment has returned to the COD value of the raw water. The reason for this has not yet been clarified. On the other hand, by processing in the second ozone reaction tank as further ozone treatment,
It can be seen that not only TOC but also COD can be significantly reduced to 7 ppm (COD of 70% of raw water is cut).
【図１】本発明の高度オゾン処理装置の概要を図であ
る。FIG. 1 is a diagram showing an outline of an advanced ozone treatment apparatus of the present invention.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4D028 BA00 BB02 BC01 BC12 BD06 BE01 CB02 CC02 CD01 4D050 AA12 AB07 BB02 BD03 BD04 BD06 CA13 CA17 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 4D028 BA00 BB02 BC01 BC12 BD06 BE01 CB02 CC02 CD01 4D050 AA12 AB07 BB02 BD03 BD04 BD06 CA13 CA17
Claims (6)
処理を行う第一工程、（２）オゾン処理された処理水を
生物処理する第二工程及び（３）生物処理された処理水
にオゾンガスを注入してオゾン処理を行う第三工程を有
することを特徴とする排水の高度処理方法。1. A first step of performing ozone treatment by injecting ozone gas into waste water, (2) a second step of biologically treating treated water that has been subjected to ozone treatment, and (3) treated water that has undergone biological treatment. An advanced method for treating wastewater, comprising a third step of injecting ozone gas to perform ozone treatment.
上である請求項１記載の高度処理方法。2. The advanced treatment method according to claim 1, wherein the COD of the wastewater in the first step is 25 mg / L or more.
工程における排水及び／又は処理水のｐＨを７．５以上
とする請求項１又は２に記載の高度処理方法。3. The advanced treatment method according to claim 1 or 2, wherein the pH of the waste water and / or the treated water in at least one of the first step and the third step is 7.5 or more.
で行われる請求項１〜３のいずれかに記載の高度処理方
法。4. The advanced treatment method according to claim 1, wherein the ozone treatment is performed only in the first step and the second step.
処理を行う第一次オゾン反応槽、（２）オゾン処理され
た処理水を生物処理する生物処理槽及び（３）生物処理
された処理水にオゾンガスを注入してオゾン処理を行う
第二次オゾン反応槽を有し、オゾン反応槽としては上記
第一次オゾン反応槽及び第二次オゾン反応槽のみである
ことを特徴とする排水の高度処理装置。5. A primary ozone reaction tank for performing ozone treatment by injecting ozone gas into waste water, (2) a biological treatment tank for biologically treating ozone-treated water, and (3) biological treatment. Wastewater characterized by having a secondary ozone reaction tank for performing ozone treatment by injecting ozone gas into treated water, and having only the above-mentioned primary ozone reaction tank and secondary ozone reaction tank as the ozone reaction tank Advanced processing equipment.
び第二次オゾン反応槽に区画されたタンクを有する排水
処理装置であって、 ２つの仕切板がタンク中に設置され、各仕切板はタンク
底部からタンク天井に向かって延びており、この２つの
仕切板が第一次オゾン反応槽、生物処理槽及び第二次オ
ゾン反応槽に区画し、 各反応槽で処理された処理水が各仕切板を越えて隣接す
る反応槽に順に流れるように仕切板とタンク天井との間
に隙間が設けられ、 オゾンガス及び排水を含む混合液が導入できる導入口が
第一次オゾン反応槽に設置され、 第二次オゾン反応槽での処理が完了した処理完了水を外
部に送り出すための排出口が第二次オゾン反応槽に設け
られている、 ことを特徴とする排水の高度処理装置。6. A wastewater treatment equipment having a tank whose interior is divided into a primary ozone reaction tank, a biological treatment tank and a secondary ozone reaction tank, wherein two partition plates are installed in each tank. The partition plate extends from the bottom of the tank toward the tank ceiling, and these two partition plates are divided into a primary ozone reaction tank, a biological treatment tank and a secondary ozone reaction tank, and the processing performed in each reaction tank A primary ozone reaction tank is provided with a gap between the partition plate and the tank ceiling so that water can flow over each partition plate to the adjacent reaction tanks in order, and a mixture containing ozone gas and waste water can be introduced. Installed in the secondary ozone reaction tank, the secondary ozone reaction tank is provided with an outlet for sending out the treatment-completed water that has been treated in the secondary ozone reaction tank to the outside. .
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7527287B2 (en) | 2003-10-31 | 2009-05-05 | Autoliv Development Ab | Side curtain air-bag |
| JP2017100099A (en) * | 2015-12-03 | 2017-06-08 | 三菱電機株式会社 | Water treatment system and water treatment method |
| CN117843127A (en) * | 2024-03-04 | 2024-04-09 | 中国科学院过程工程研究所 | A microbial coupled ozone advanced oxidation integrated device and method for treating landfill leachate |
-
2002
- 2002-01-11 JP JP2002004137A patent/JP4025972B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7527287B2 (en) | 2003-10-31 | 2009-05-05 | Autoliv Development Ab | Side curtain air-bag |
| US8220831B2 (en) | 2003-10-31 | 2012-07-17 | Autoliv Development Ab | Side curtain air-bag |
| JP2017100099A (en) * | 2015-12-03 | 2017-06-08 | 三菱電機株式会社 | Water treatment system and water treatment method |
| CN117843127A (en) * | 2024-03-04 | 2024-04-09 | 中国科学院过程工程研究所 | A microbial coupled ozone advanced oxidation integrated device and method for treating landfill leachate |
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