JP2008110333A - Total oxidation tank, and apparatus and method for treating waste water by using the same - Google Patents

Total oxidation tank, and apparatus and method for treating waste water by using the same Download PDF

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JP2008110333A
JP2008110333A JP2007193970A JP2007193970A JP2008110333A JP 2008110333 A JP2008110333 A JP 2008110333A JP 2007193970 A JP2007193970 A JP 2007193970A JP 2007193970 A JP2007193970 A JP 2007193970A JP 2008110333 A JP2008110333 A JP 2008110333A
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tank
total oxidation
wastewater
oxidation tank
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Yukimatsu Shakunaga
幸松 釈永
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Kuraray Kiko KK
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    • YGENERAL 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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    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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    • Y02W10/10Biological treatment of water, waste water, or sewage

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a total oxidation tank capable of making an apparatus for treating waste water compact and small, and the apparatus and a method for treating waste water by using the total oxidation tank. <P>SOLUTION: The total oxidation tank is used for auto-oxidizing sludge and has a precipitation tank therein. The total oxidation tank is used in the apparatus for treating waste water. The method for treating waste water comprises the steps of: adding an enzyme to oil-containing waste water; fluidizing a microbe-immoblilized gel carrier and bringing the fluidized carrier into contact with the enzyme-added waste water; and treating the resulting waste water in the total oxidation tank having the precipitation tank therein. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、全酸化槽、並びにそれを用いた排水処理装置および排水処理方法に関する。さらに詳しくは、汚泥を自己酸化させるための全酸化槽であって、内部に沈殿槽を設けたことを特徴とする全酸化槽、並びにそれを用いた排水処理装置および排水処理方法に関する。   The present invention relates to a total oxidation tank, and a waste water treatment apparatus and waste water treatment method using the same. More specifically, the present invention relates to a total oxidation tank for self-oxidizing sludge, which is provided with a precipitation tank inside, and a waste water treatment apparatus and a waste water treatment method using the same.

近年、排水処理の分野において、排水処理に伴って生じる余剰汚泥の削減が重要課題になっており、その対策として、全酸化槽を設置した排水処理装置が提案されている(特許文献1)。ここに開示された排水処理装置は、好気性条件下で排水を担体粒子と接触させるための曝気槽と全酸化槽とを備え、全酸化槽内の液を分離膜で濾過することによって排水処理を行なうものであり、かかる排水処理装置によれば排水処理を効率よく行なうことができ、余剰汚泥を発生させないで排水を処理することが可能であると記載されている。
特開2001−205290公報
In recent years, in the field of wastewater treatment, reduction of excess sludge generated with wastewater treatment has become an important issue, and as a countermeasure against this, a wastewater treatment apparatus in which a total oxidation tank is installed has been proposed (Patent Document 1). The wastewater treatment device disclosed herein includes an aeration tank and a total oxidation tank for contacting wastewater with carrier particles under aerobic conditions, and wastewater treatment by filtering the liquid in the total oxidation tank through a separation membrane. According to this waste water treatment apparatus, it is described that waste water treatment can be performed efficiently and waste water can be treated without generating excess sludge.
JP 2001-205290 A

しかしながら、この排水処理装置は全酸化槽内の液を分離膜で濾過するものであり、膜設備の投資金額が大きくなることやメンテナンス費用が大きくなることから実用性の点で問題であることが指摘されている。   However, this wastewater treatment device filters the liquid in the entire oxidation tank with a separation membrane, and it is problematic in terms of practicality because the investment amount of the membrane equipment increases and maintenance costs increase. It has been pointed out.

これを改善する排水処理方法として、排水を曝気槽にて好気性条件下で微生物固定化担体と接触させる曝気工程、全酸化槽にて好気性条件下BOD汚泥負荷が0.08kg−BOD/kg−MLSS・日以下で汚泥を自己酸化させる全酸化工程及び沈殿槽にて汚泥を沈降させる沈殿工程をこの順で行い、全酸化槽に凝集剤を添加する余剰汚泥引き抜きの少ない排水処理方法が提案されている。
WO2006/009125 A1公報
As a wastewater treatment method for improving this, an aeration process in which wastewater is brought into contact with a microorganism-immobilized carrier in an aerobic tank, and a BOD sludge load of 0.08 kg-BOD / kg in an aerobic condition in a total oxidation tank -Proposal of a wastewater treatment method with less excess sludge extraction by adding a flocculant to the total oxidation tank in this order, in which the total oxidation process for self-oxidizing sludge at less than MLSS / day and the sedimentation process for sedimenting sludge in a sedimentation tank are performed in this order. Has been.
WO2006 / 009125 A1 publication

しかしながら、これらに提案された排水処理装置は、標準活性汚泥法に用いられる活性汚泥装置に比べると、全酸化槽の分だけ設備が大きくなること、および沈殿槽からの汚泥返送量が大幅に多くなることから、設備設置費用やランニングコストが大きくなることは不可避である。特許文献2には、設備のコンパクト化の方法として、汚泥分離用の従来型の沈殿槽の代わりに浸漬膜による分離設備を設置することも開示されているが、上記したように、膜設備の投資金額が大きくなることやメンテナンス費用が大きくなることから実用性の点で問題があることは否めない。   However, compared with the activated sludge apparatus used in the standard activated sludge method, the wastewater treatment apparatus proposed for them has a larger facility for the total oxidation tank, and the amount of sludge returned from the settling tank is significantly larger. Therefore, it is inevitable that facility installation costs and running costs will increase. In Patent Document 2, as a method for downsizing the equipment, it is also disclosed that a separation equipment using a submerged membrane is installed instead of a conventional sedimentation tank for separating sludge. It cannot be denied that there is a problem in terms of practicality because the investment amount increases and the maintenance cost increases.

一方、従来から排水処理は、嫌気性処理槽による方法または好気性処理槽による標準活性汚泥法、および両者の組み合わせにより実施されてきたが、いずれの場合でも詳細なプロセス仕様は個々の排水に合わせて最適な設計をする必要があり、かつ設置費用および運転費用が大きく、また運転面においては管理が容易でないため専任運転員が必要であった。そのため大量の排水を処理する大型設備の実例は多く見られるが、小型設備の実施例は少ない。   On the other hand, wastewater treatment has traditionally been carried out by an anaerobic treatment tank method, a standard activated sludge method by an aerobic treatment tank, or a combination of both, but in either case the detailed process specifications are tailored to the individual wastewater. Therefore, it is necessary to design optimally, and the installation cost and operation cost are large, and since the management is not easy in terms of operation, a dedicated operator is required. For this reason, there are many examples of large-scale equipment for treating a large amount of wastewater, but there are few examples of small-sized equipment.

これまで、維持費用が安いだけでなく、運転面からも管理が容易で専任運転者が不要で、種々の排水に対応できる小型の万能排水処理設備が熱望されていたが、大型設備をそのまま小さくしただけでは技術面およびコスト面から問題が多く、実施に至っていないのが現状である。このような小型の万能排水処理設備を実施するためには、排水負荷の変動や阻害物質の蓄積に耐え得ること、かつ余剰汚泥の発生が少ないプロセスを構築することが不可欠である。   Up to now, not only is the maintenance cost low, but also a small universal wastewater treatment facility that can handle various types of wastewater has been eagerly awaited. However, there are many problems from the technical and cost points of view, and the actual situation has not been achieved. In order to implement such a small universal wastewater treatment facility, it is indispensable to establish a process that can withstand fluctuations in drainage load and accumulation of inhibitory substances and generates less excess sludge.

このように、従来の全酸化槽を用いる排水処理方式は、全酸化槽の外部に沈殿槽を設置するか、沈殿槽の内部に膜を浸漬するものであり、排水処理装置のコンパクト化という点ではまだ問題点を残している。したがって、本発明の目的は、排水処理装置のコンパクト化、小型化を可能とする全酸化槽、並びにそれを用いた排水処理装置および排水処理方法を提供することにある。   As described above, the wastewater treatment method using the conventional total oxidation tank is to install a precipitation tank outside the total oxidation tank or to immerse the film inside the precipitation tank, and to reduce the size of the wastewater treatment apparatus. So there are still problems. Accordingly, an object of the present invention is to provide a total oxidation tank that enables a wastewater treatment apparatus to be made compact and compact, and a wastewater treatment apparatus and wastewater treatment method using the same.

前述した全酸化槽を使用する方法においては、標準活性汚泥法に比べて沈殿槽から曝気槽への汚泥返送量は多いが、汚泥返送を廃止することができれば、プロセス面、コスト面などから非常に効果が大きいこと、および標準活性汚泥法の曝気槽では汚泥分離が困難であるが、全酸化槽では汚泥分離が容易であるというメリットがある。   In the method using the total oxidation tank described above, the amount of sludge returned from the settling tank to the aeration tank is larger than that in the standard activated sludge method. However, if the sludge return can be abolished, it is extremely difficult from the viewpoint of process and cost. However, there is an advantage that sludge separation is difficult in the aeration tank of the standard activated sludge method, but sludge separation is easy in the total oxidation tank.

本発明者は上記の点に鑑み、全酸化槽の改良という観点から鋭意検討を重ね、全酸化槽の内部に沈殿槽を設置するという極めて簡単な構成により、上記目的を達成することができることを見出し、本発明に到達した。すなわち、本発明の第1の発明は、汚泥を自己酸化させるための全酸化槽であって、内部に沈殿槽を設けたことを特徴とする全酸化槽である。   In view of the above points, the present inventor has repeatedly studied earnestly from the viewpoint of improving the total oxidation tank, and can achieve the above object with a very simple configuration in which a precipitation tank is installed inside the total oxidation tank. The headline, the present invention has been reached. That is, the first invention of the present invention is a total oxidation tank for self-oxidizing sludge, wherein a total oxidation tank is provided with a precipitation tank inside.

また、本発明の第2の発明は、微生物固定化ゲル担体を流動させて排水と接触させるための処理槽と、内部に沈殿槽を設けた全酸化槽から構成された排水処理装置である。 Moreover, 2nd invention of this invention is the waste water treatment equipment comprised from the processing tank for making microorganisms fixed gel support | carrier flow and contact with waste_water | drain, and the total oxidation tank which provided the sedimentation tank inside.

また、本発明の第3の発明は、含油排水に酵素を添加した後、微生物固定化ゲル担体を流動させて排水と接触させ、内部に沈殿槽を設けた全酸化槽で処理することを特徴とする排水処理方法である。   The third invention of the present invention is characterized in that after adding an enzyme to the oil-containing wastewater, the microorganism-immobilized gel carrier is made to flow and contact with the wastewater, and is treated in a total oxidation tank provided with a sedimentation tank inside. This is a wastewater treatment method.

本発明により、内部に沈殿槽を設けた改良された全酸化槽を提供することができる。このような全酸化槽は、排水処理装置のコンパクト化、小型化を可能にするものであり、設備投資金額の大幅な削減が可能になるとともに、沈殿槽からの汚泥返送が不要になることでランニングコストを減少させることができ、微生物固定化ゲル担体を流動させて排水と接触させるための処理槽と組み合わせて排水処理装置に好ましく用いられる。また、油脂を含む排水を処理する場合、酵素を添加することで微生物固定化ゲル担体の能力を低下させることなく効率よく排水処理を実施することができる。   According to the present invention, it is possible to provide an improved total oxidation tank provided with a precipitation tank inside. Such a total oxidation tank makes it possible to reduce the size and size of the wastewater treatment equipment, which can greatly reduce the amount of capital investment and eliminate the need to return sludge from the settling tank. The running cost can be reduced, and it is preferably used in a wastewater treatment apparatus in combination with a treatment tank for causing the microorganism-immobilized gel carrier to flow and contact with wastewater. Moreover, when processing the wastewater containing fats and oils, wastewater treatment can be efficiently implemented by adding an enzyme, without reducing the capability of a microorganism fixed gel support | carrier.

本発明の改良された全酸化槽は、従来の全酸化槽内に沈殿槽を設置したものであるので、従来の排水処理装置における外部沈殿槽が不要となり、装置全体がコンパクト化され、設備投資金額の大幅な削減が可能になる。このような全酸化槽は、微生物固定化ゲル担体を流動させて排水と接触させるための処理槽と組み合わせた排水処理装置に好ましく使用される。   Since the improved total oxidation tank of the present invention is a settling tank installed in a conventional total oxidation tank, an external precipitation tank in a conventional waste water treatment apparatus is not required, the entire apparatus is made compact, and capital investment is made. Significant reductions in money are possible. Such a total oxidation tank is preferably used in a wastewater treatment apparatus combined with a treatment tank for causing a microorganism-immobilized gel carrier to flow and contact with wastewater.

処理槽の具体例としては、BOD処理槽、脱窒槽および硝化槽などを挙げることができるが、これらは排水の性状に応じて、例えば、嫌気槽(脱窒槽)−好気槽(硝化槽)−改良された全酸化槽、好気槽(硝化槽)−嫌気槽(脱窒槽)−改良された全酸化槽など適宜組み合わせて使用される。処理槽や全酸化槽は、通常耐腐食性鋼又はプラスチックで作製されるが、その他の部分を耐腐食性鋼又はプラスチックで作製してよいことは勿論である。   Specific examples of the treatment tank include a BOD treatment tank, a denitrification tank, a nitrification tank, and the like. Depending on the properties of the waste water, for example, an anaerobic tank (denitrification tank) -aerobic tank (nitrification tank). -Improved total oxidation tank, aerobic tank (nitrification tank)-anaerobic tank (denitrification tank)-improved total oxidation tank, etc. The treatment tank and the total oxidation tank are usually made of corrosion-resistant steel or plastic, but it goes without saying that other parts may be made of corrosion-resistant steel or plastic.

処理槽において用いられる微生物固定化ゲル担体としては、ポリビニルアルコール系、ポリエチレングリコール系、ポリアクリルアミド系などの高分子含水ゲル、アルギン酸カルシウム、カラギーナン、寒天などの高分子ゲルなどを例示することができるが、菌を付着させた場合、BOD除去能力の点で高分子含水ゲルが好ましい。   Examples of the microorganism-immobilized gel carrier used in the treatment tank include polymer hydrous gels such as polyvinyl alcohols, polyethylene glycols, and polyacrylamides, and polymer gels such as calcium alginate, carrageenan, and agar. When the bacteria are attached, a polymer hydrogel is preferable in terms of the ability to remove BOD.

なかでも、ポリビニルアルコール系の含水ゲルは、担体表面及び内部に網目構造を有しているため微生物が生息しやすく、かつ有機化合物の捕捉性に優れており、しかも機械的強度にも優れているので好ましい。このようなポリビニルアルコール系の含水ゲルの具体例としては、株式会社クラレ製の商品名クラゲールを挙げることができる。   Among them, the polyvinyl alcohol-based hydrogel has a network structure on the surface and inside of the carrier, so that microorganisms can easily inhabit it, and it has excellent organic compound scavenging properties, as well as excellent mechanical strength. Therefore, it is preferable. As a specific example of such a polyvinyl alcohol-based hydrogel, there is a trade name “Kragale” manufactured by Kuraray Co., Ltd.

処理すべき排水が油脂分を含む場合、排水に酵素を添加して処理すると、油脂分を含む排水でも含水ゲルの処理能力を低下させることなく、高い効率を維持することができ、好ましい。このような酵素としては、市販されている多くの酵素が使用可能であるが、天然由来の酵素を使用するのが環境の面で好ましい。   When the wastewater to be treated contains fats and oils, it is preferable to treat the wastewater by adding enzymes to the wastewater containing fats and oils without maintaining the treatment capacity of the hydrogel, even if the wastewater contains fats and oils. As such an enzyme, many commercially available enzymes can be used, but it is preferable from the viewpoint of the environment to use a naturally derived enzyme.

天然由来の酵素としては、例えば、商品名で、EM菌、宇山酵素、曽我部酵素、バイオセーバ、オイルバクスターなどを挙げることができる。具体的には、EM菌は琉球大学、宇山酵素は広島大学、曽我部酵素は愛媛大学、バイオセーバ、オイルバクスターは民間各社から入手することが可能である。なかでも曽我部酵素が好ましい。   Examples of naturally-occurring enzymes include EM fungi, Uyama enzyme, Sogabe enzyme, biosaver, and oil baxter under the trade name. Specifically, EM bacteria can be obtained from University of the Ryukyus, Uyama enzyme from Hiroshima University, Sogabe enzyme from Ehime University, Biosaver and Oil Baxter from private companies. Of these, the Sogabe enzyme is preferred.

酵素は単独で使用してもよいが、複数種類の酵素を混合した酵素を使用する方が効果が大きく好ましい。酵素の添加量は排水の性状によるので一概には決められないが、液状酵素で処理原水量の0.001%もあれば大きく能力が向上する。   Enzymes may be used singly, but it is preferable to use an enzyme in which a plurality of types of enzymes are mixed. The amount of the enzyme added depends on the properties of the wastewater, so it cannot be determined unconditionally. However, if it is 0.001% of the amount of raw water to be treated with a liquid enzyme, the capacity is greatly improved.

本発明の排水処理装置及び排水処理方法は、余剰汚泥の引き抜きの少ない排水処理システムが構築できる場合に適用可能である。また、全酸化槽に凝集剤を添加すると全酸化槽内に設置した沈殿槽の面積を小さくすることができる場合がある。   The waste water treatment apparatus and waste water treatment method of the present invention can be applied when a waste water treatment system with little excess sludge extraction can be constructed. Moreover, when a flocculant is added to the total oxidation tank, the area of the precipitation tank installed in the total oxidation tank may be reduced.

凝集剤としては従来公知の、例えば、硫酸アルミニウム(硫酸バン土)、アルミン酸ナトリウム、塩基性塩化アルミニウム、硫酸第一鉄、塩化第二鉄、硫酸第二鉄、塩素化コッパラスなどの無機凝集剤、アルギン酸ナトリウム、CMCナトリウム塩、ポリアクリル酸ナトリウム、マレイン酸共重合物、ポリエチレンイミン、第4級アンモニウム塩、ポリアクリルアミド、ポリオキシエチレンなどの有機高分子凝集剤などを挙げることができる。   As the aggregating agent, conventionally known inorganic aggregating agents such as aluminum sulfate (sodium sulfate), sodium aluminate, basic aluminum chloride, ferrous sulfate, ferric chloride, ferric sulfate, chlorinated coppers, etc. And organic polymer flocculants such as sodium alginate, CMC sodium salt, sodium polyacrylate, maleic acid copolymer, polyethyleneimine, quaternary ammonium salt, polyacrylamide, polyoxyethylene and the like.

以下、本発明の脱窒用排水処理装置を図によりさらに具体的に説明する。図1は本発明の排水処理装置の一例を示す概略図であり、本質的に嫌気槽(脱窒槽)−好気槽(硝化槽)−全酸化槽から構成された例である。1は原水流入管であり、供給された原水は先ず嫌気槽である脱窒槽2へ導入される。脱窒槽には微生物固定化ゲル担体が脱窒槽容積の約10%程度投入され、脱窒槽には好ましくは攪拌装置3を設けてゲル担体を十分に流動させる。脱窒槽において、排水は嫌気条件下に処理される。   Hereinafter, the denitrification waste water treatment apparatus of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic view showing an example of the wastewater treatment apparatus of the present invention, which is an example constituted essentially of an anaerobic tank (denitrification tank) -aerobic tank (nitrification tank) -total oxidation tank. Reference numeral 1 denotes a raw water inflow pipe, and the supplied raw water is first introduced into a denitrification tank 2 which is an anaerobic tank. About 10% of the denitrification tank volume is charged with the microorganism-immobilized gel carrier in the denitrification tank, and the denitrification tank is preferably provided with a stirring device 3 to sufficiently flow the gel carrier. In the denitrification tank, the waste water is treated under anaerobic conditions.

排水が油脂分を含む場合は、脱窒槽に酵素を添加するのが好ましく、4はこのような酵素添加装置である。微生物固定化ゲル担体の流出を防ぐために、脱窒槽にスクリーン(図示せず)を設けるのが好ましい。微生物固定化ゲル担体としては、前述したような、株式会社クラレ製のアセタール化ポリビニルアルコールゲル担体(商品名クラゲール)が好適である。   When the waste water contains oil and fat, it is preferable to add an enzyme to the denitrification tank, and 4 is such an enzyme adding device. In order to prevent the microorganism-immobilized gel carrier from flowing out, it is preferable to provide a screen (not shown) in the denitrification tank. As the microorganism-immobilized gel carrier, the acetalized polyvinyl alcohol gel carrier manufactured by Kuraray Co., Ltd. (trade name: Kragale) as described above is suitable.

脱窒処理水は、好気槽である硝化槽5へ導入される。硝化槽には上記した微生物固定化ゲル担体が硝化槽容積の約10%程度投入され、硝化槽において散気装置6によりゲル担体を十分に流動させるとともに脱窒処理水を好気条件下に処理する。硝化処理水には硝酸性窒素が含まれるので、硝化処理水の一部を脱窒槽に返送して脱窒処理を行うと排水を効率よく処理することができる。排気は排気筒7から外部へ放出されるが、必要に応じ悪臭対策をするのが好ましい。   The denitrification water is introduced into the nitrification tank 5 which is an aerobic tank. About 10% of the above-mentioned microorganism-immobilized gel carrier is introduced into the nitrification tank, and the gel carrier is sufficiently flowed by the air diffuser 6 in the nitrification tank and the denitrification water is treated under aerobic conditions. To do. Since nitrification water contains nitrate nitrogen, waste water can be efficiently treated by denitrification treatment by returning a part of the nitrification water to the denitrification tank. Exhaust gas is discharged from the exhaust pipe 7 to the outside, but it is preferable to take measures against bad odor as necessary.

硝化処理水は、沈殿槽8を備えた全酸化槽9へ導入される。全酸化槽では曝気が行われ、硝化処理水を好気条件下に処理する。硝化槽にスクリーン(図示せず)を設けると微生物固定化ゲル担体の流出を防ぐことができ好ましい。全酸化槽で処理された酸化処理水は、流出管10から系外へ抜き出される。処理後の水はそのまま放流してもよいが適宜滅菌処理などをして回収水としてもよい。11はブロワーが設置された機械室であり、操作パネル12により設備全体の運転制御がなされる。   The nitrification water is introduced into a total oxidation tank 9 equipped with a precipitation tank 8. Aeration is performed in the total oxidation tank, and nitrification water is treated under aerobic conditions. Providing a screen (not shown) in the nitrification tank is preferable because it prevents the microorganism-immobilized gel carrier from flowing out. Oxidized water treated in the entire oxidation tank is extracted from the outflow pipe 10 to the outside of the system. The treated water may be discharged as it is, but may be sterilized as appropriate to obtain recovered water. Reference numeral 11 denotes a machine room in which a blower is installed, and the operation of the entire equipment is controlled by the operation panel 12.

以上は原水の導入側から処理槽を嫌気槽(脱窒槽)―好気槽(硝化槽)の順に配列した例であるが、好気槽(硝化槽)―嫌気槽(脱窒槽)の順に配列してもよい。この場合は脱窒菌の生育のために脱窒槽にメタノールなどの有機炭素源を補給する必要がある。脱窒槽の前に嫌気性処理を行うための嫌気濾過装置又は最初沈殿槽を設けると排水中の浮遊物などが除かれるのでさらに効果的である。処理槽がBOD処理槽であってもよいが、上述と実質的に同じであるので説明は省略する。   The above is an example in which treatment tanks are arranged in the order of anaerobic tank (denitrification tank)-aerobic tank (nitrification tank) from the raw water introduction side. May be. In this case, it is necessary to replenish the denitrification tank with an organic carbon source such as methanol for the growth of denitrifying bacteria. Providing an anaerobic filtration device or an initial settling tank for anaerobic treatment before the denitrification tank is more effective because suspended matters in the waste water are removed. The treatment tank may be a BOD treatment tank, but the description is omitted because it is substantially the same as described above.

本発明における最大の特徴は、全酸化槽の内部に沈殿槽を設けたことにあり、このような構成とすることにより、全酸化槽を有する排水処理装置の設備全体がコンパクトになり、設備投資金額が大幅に削減されるとともに、沈殿槽からの汚泥返送が不要になり、ランニングコストも大幅に減少する。   The greatest feature of the present invention is that a settling tank is provided inside the total oxidation tank. By adopting such a configuration, the entire equipment of the wastewater treatment apparatus having the total oxidation tank becomes compact, and capital investment is made. The amount of money is greatly reduced, sludge return from the settling tank is no longer necessary, and running costs are greatly reduced.

通常、全酸化槽内に沈殿槽を設置した場合には、沈殿槽が排除する体積分だけ全酸化槽の能力が減少することになるので、沈殿槽廃止の利点を増大するとともに、全酸化槽の能力が減少しないようにすることが重要である。また、全酸化槽内は曝気状態にあり処理液が激しく流動しているので、沈殿槽内部では流れを沈静化することも重要になる。このような点から考えると、全酸化槽内に沈殿槽を設置する場合、従来の構造の沈殿槽をそのまま使用するよりは、従来と全く異なる構造の沈殿槽を開発する方がより好ましい全酸化槽を提供することができる。   Normally, when a sedimentation tank is installed in the total oxidation tank, the capacity of the total oxidation tank is reduced by the volume that the sedimentation tank eliminates. It is important not to reduce the ability. Further, since the inside of the entire oxidation tank is in an aerated state and the processing liquid is flowing vigorously, it is important to calm the flow inside the precipitation tank. From this point of view, when installing a settling tank in the total oxidation tank, it is more preferable to develop a settling tank having a completely different structure from the conventional one, rather than using a conventional settling tank as it is. A bath can be provided.

先ず、沈殿槽の体積を小さくするためには、沈殿槽の面積および高さを小さくする必要があるが、面積は沈殿操作能力に比例するので原則として小さくすることは困難であるので、高さを小さくすることが解決に繋がる。次に、沈殿槽内部では流れを沈静化するために、全酸化槽との縁を切ることが必要である。   First, in order to reduce the volume of the sedimentation tank, it is necessary to reduce the area and height of the sedimentation tank. However, since the area is proportional to the sedimentation operation capacity, it is difficult to reduce it in principle. Making it smaller leads to a solution. Next, in order to calm the flow inside the settling tank, it is necessary to cut the edge with the total oxidation tank.

以上の観点から、本発明者らはさらに検討を重ね、全酸化槽内部に設置するための沈殿槽として、回転可能な上下逆コーン形状円盤を備えた沈殿槽が好ましいことを見出した。回転可能な上下逆コーン形状円盤は図2に示すように、コーン形状の2つの円盤を底部で接合させたような形状である。   From the above viewpoints, the present inventors have further studied and found that a precipitation tank provided with a rotatable upside down cone-shaped disk is preferable as a precipitation tank for installation inside the entire oxidation tank. As shown in FIG. 2, the rotatable upside-down inverted cone-shaped disk has a shape in which two cone-shaped disks are joined at the bottom.

沈殿槽内に、このような上下逆コーン形状円盤を備えることにより、下方からの上昇液流や曝気の動きを止めると共に、それらをスムーズに上方に逃がしてやることが可能となる。下側の円盤は、上昇してくる液流や曝気をスムーズに上方に逃がす機能があり、上側の円盤は、スラッジがスムーズに流れ落ちるようにする機能を果たす。また、沈殿槽の下部には、処理液の沈静化を達成するために遮蔽板を取り付けることが好ましい。   By providing such a vertically inverted cone-shaped disk in the settling tank, it is possible to stop the upward liquid flow and the movement of the aeration from the lower side and to smoothly release them upward. The lower disk has a function to smoothly escape upward liquid flow and aeration, and the upper disk has a function to allow sludge to flow smoothly. Moreover, it is preferable to attach a shielding plate to the lower part of the settling tank in order to achieve the calming of the treatment liquid.

改良された全酸化槽について、図によりさらに具体的に説明する。図2は改良された全酸化槽の概略図であり、20は改良された全酸化槽、21は処理水流入管、22は散気装置、23は全酸化槽内に設置された沈殿槽である。沈殿槽を全酸化槽に固定するためのブラケットなどは図示省略している。   The improved total oxidation tank will be described more specifically with reference to the drawings. FIG. 2 is a schematic view of an improved total oxidation tank, 20 is an improved total oxidation tank, 21 is a treated water inflow pipe, 22 is an air diffuser, and 23 is a settling tank installed in the total oxidation tank. . A bracket for fixing the precipitation tank to the total oxidation tank is not shown.

24は上下逆コーン形状円盤であり、上に頂点を有する円錐状円盤と、下に頂点を有する円錐状円盤とが底部で接合されたような構造のものであり、回転可能に構成されている。25はコーン形状円盤を回転させるための駆動機である。   Reference numeral 24 denotes an upside down inverted cone-shaped disk having a structure in which a conical disk having an apex on the top and a conical disk having an apex on the bottom are joined at the bottom, and is configured to be rotatable. . Reference numeral 25 denotes a driving machine for rotating the cone-shaped disk.

円盤の回転速度は、頂角の角度にもよるが、遠心力により円盤上に堆積した汚泥の流下の程度で決めればよく、通常5〜60rpm程度で実施される。26は直胴折り返しであり、処理水はこの上部円盤と折り返しとの間隙を通って沈殿槽内部へ流入し、27の流出管から系外へ抜き出される。28は全酸化槽の液面である。   The rotational speed of the disk depends on the angle of the apex angle, but may be determined by the degree of sludge accumulated on the disk by centrifugal force, and is usually performed at about 5 to 60 rpm. Reference numeral 26 denotes a straight body folding, and the treated water flows into the sedimentation tank through the gap between the upper disk and the folding, and is extracted from the outflow pipe 27 to the outside of the system. 28 is the liquid level of the total oxidation tank.

上に頂点を有する上部円錐状円盤の頂角は、汚泥排出の点から10〜30度、下に頂点を有する下部円錐状円盤の頂角は、液の上昇流れをスムーズにする観点から5〜10度とするのが好ましい。処理後水は、水面部に設置した流出管から系外へ抜き出され、スラッジは上部円錐状円盤に沿って、全酸化槽内に落下して行く。この間隙は処理水の性状や処理速度に関係して一概に決めることはできないが、通常30〜100mmである。円盤の径は直胴部の径より大きくする必要が有り、直胴部の径の1.1〜1.2倍で実施される。   The apex angle of the upper conical disk having the apex on the top is 10 to 30 degrees from the point of sludge discharge, and the apex angle of the lower conical disk having the apex on the bottom is 5 to 5% from the viewpoint of smoothing the upward flow of the liquid. 10 degrees is preferable. The treated water is drawn out of the system from the outflow pipe installed on the water surface, and the sludge falls along the upper conical disk into the entire oxidation tank. This gap cannot be generally determined in relation to the properties of the treated water and the treatment speed, but is usually 30 to 100 mm. The diameter of the disk needs to be larger than the diameter of the straight body part, and the diameter is 1.1 to 1.2 times the diameter of the straight body part.

槽内での液の流れの影響や曝気エヤーの影響を受けると、汚泥分離装置内での液流が乱れることになるので、直胴部の下部に折り返しをつけて、全酸化槽内での液の流れの影響を受けないようにすることが好ましい。沈殿槽全体が揺れると汚泥分離に悪影響が出るので、揺れないように設備の大きさに合わせて適当な肉厚の部材を使用して直胴部や円盤の強度を保つのが好ましい。   If affected by the flow of liquid in the tank or aeration air, the liquid flow in the sludge separator will be disturbed. It is preferable not to be affected by the flow of the liquid. If the entire sedimentation tank is shaken, the sludge separation is adversely affected. Therefore, it is preferable to maintain the strength of the straight body and the disk by using a member having an appropriate thickness according to the size of the equipment so as not to shake.

図3は改良された全酸化槽の別の態様を示す概略図である。処理水流入管29から流入した処理水は改良された全酸化槽30に流入する。全酸化槽の処理水は、沈殿槽への流入管31から導入口32を通り、沈殿槽34へ流入する。導入口は、槽壁面に多数設けるのが好ましい。 FIG. 3 is a schematic view showing another embodiment of the improved total oxidation tank. The treated water flowing from the treated water inflow pipe 29 flows into the improved total oxidation tank 30. The treated water in all the oxidation tanks flows from the inflow pipe 31 to the settling tank through the inlet 32 and into the settling tank 34. It is preferable to provide a large number of inlets on the tank wall surface.

処理水は沈殿槽で上澄水と汚泥含有液とに分離され、上澄水は流出ポンプ36により、流出管37から系外へ排出される。35は上澄水流出部である。一方、汚泥含有液は、汚泥排出ポンプ38により、汚泥排出管39〜40から排出される。図3において、41は全酸化槽の液面、33はレーキサポート、42はレーキ、43は散気装置である。   The treated water is separated into supernatant water and sludge-containing liquid in the sedimentation tank, and the supernatant water is discharged out of the system from the outflow pipe 37 by the outflow pump 36. 35 is a supernatant water outflow part. On the other hand, the sludge containing liquid is discharged from the sludge discharge pipes 39 to 40 by the sludge discharge pump 38. In FIG. 3, 41 is the liquid level of the total oxidation tank, 33 is a rake support, 42 is a rake, and 43 is a diffuser.

本発明において、改良された全酸化槽を用いて排水処理を行なうと、沈殿槽からの汚泥返送が不要になり、コンパクトで効率よく排水処理を実施することができる。この理由を明確に説明することはできないが、改良された全酸化槽では汚泥の性状が汚泥分離の容易な方向に変化することと、一般に全酸化槽は設置面積が大きいので、沈殿槽の占める設置面積が全酸化槽に比べて比較的小さく、沈殿槽を設置するデメリットが小さいことが考えられる。以下、実施例によって本発明をさらに具体的に説明する。   In the present invention, when wastewater treatment is performed using the improved total oxidation tank, sludge return from the sedimentation tank becomes unnecessary, and the wastewater treatment can be carried out in a compact and efficient manner. The reason for this cannot be clearly explained, but in the improved total oxidation tank, the sludge properties change in the direction of easy sludge separation, and generally the total oxidation tank has a large installation area. It is conceivable that the installation area is relatively small compared to the total oxidation tank, and the disadvantages of installing a precipitation tank are small. Hereinafter, the present invention will be described more specifically with reference to examples.

実施例1
厚さ4mmの耐腐食性鋼で20mの脱窒槽、24mの硝化槽、40mの全酸化槽を作製し、排水処理装置を構成した。全酸化槽内には、直胴部の直径が約3mの沈殿槽を設置し、面積負荷が9m/日・mとなるように運転した。沈殿槽には、頂角30度の上部円錐状円盤、および頂角10度の下部円錐状円盤からなる直径3.4mの上下逆コーン形状円盤を設け、10rpmで回転させた。
Example 1
Denitrification tank of 20 m 3 at a thickness 4mm the corrosion resistant steel, nitrification tank of 24m 3, to prepare a complete oxidation tank of 40 m 3, to constitute a waste water treatment apparatus. A precipitation tank having a diameter of the straight body portion of about 3 m was installed in the total oxidation tank and operated so that the area load was 9 m 3 / day · m 2 . The sedimentation tank was provided with an upside-down inverted cone-shaped disk having a diameter of 3.4 m and comprising an upper conical disk with an apex angle of 30 degrees and a lower conical disk with an apex angle of 10 degrees, and was rotated at 10 rpm.

図1のフローに従ってBOD約800mg/L、総窒素約100mg/Lの排水を60m/日で3ケ月連続処理したところ、処理済水のBODは50mg/L以下、SSは20〜40mg/Lと安定していた。また、処理水は上部円盤と折り返しとの間隙から沈殿槽内部に流入し、処理後水は液面レベルと同じ位置に設置された流出管より系外へ流出させたが、汚泥の分離は良好であった。 According to the flow of FIG. 1, wastewater with BOD of about 800 mg / L and total nitrogen of about 100 mg / L was continuously treated at 60 m 3 / day for 3 months. The BOD of the treated water was 50 mg / L or less and the SS was 20 to 40 mg / L. And was stable. In addition, the treated water flows into the sedimentation tank through the gap between the upper disk and the turn-up, and the treated water flows out of the system from the outflow pipe installed at the same position as the liquid level, but the sludge separation is good. Met.

本発明の全酸化槽を用いた排水処理装置は、排水処理装置のコンパクト化、小型化を可能にするものであり、設備投資金額の大幅な削減が可能になる。また、本発明の排水処理方法によれば、沈殿槽からの汚泥返送が不要になることでランニングコストを大幅に減少させることができる。さらに、排水が油脂を含む場合、酵素を添加することで微生物固定化ゲル担体の能力を低下させることなく効率よく排水処理を実施することができるので産業上の有用性が大きい。   The wastewater treatment apparatus using the total oxidation tank of the present invention enables the wastewater treatment apparatus to be made compact and small, and can greatly reduce the amount of capital investment. Moreover, according to the waste water treatment method of the present invention, the running cost can be greatly reduced by eliminating the need to return the sludge from the settling tank. Furthermore, when the wastewater contains fats and oils, the industrial utility is great because the wastewater treatment can be carried out efficiently without lowering the ability of the microorganism-immobilized gel carrier by adding an enzyme.

本発明の排水処理装置は、既存の排水処理設備を改造して処理能力を増強させる場合に大きな威力を発揮する。つまり処理流量が増加する場合は沈殿槽の増強が必要になり、一般に設置場所の不足や費用の面から沈殿槽の増設が困難な場合が多いが、本発明の排水処理装置では、処理流量が多少増加しても、沈殿槽を増設せずに対応することができる。   The wastewater treatment apparatus of the present invention exhibits great power when remodeling existing wastewater treatment equipment to enhance treatment capacity. In other words, if the treatment flow rate increases, it will be necessary to reinforce the sedimentation tank, and in general there are many cases where it is difficult to increase the number of sedimentation tanks due to lack of installation space or cost. Even a slight increase can be accommodated without adding a settling tank.

本発明の排水処理装置は、設備コストが安く、設備設置面積が小さく、汚泥処理が不要であるので、排水が50m3/日以下の少量の工場排水や、レストラン、うどん店などの小型事業者の排水処理に好ましく適用され、専任の運転管理者が不要である。   Since the wastewater treatment apparatus of the present invention is low in equipment cost, has a small equipment installation area, and does not require sludge treatment, it can be used for small-scale industrial wastewater of 50m3 / day or less, small businesses such as restaurants and udon shops. It is preferably applied to wastewater treatment and does not require a dedicated operation manager.

本発明の排水処理装置を脱窒槽−硝化槽−全酸化槽の順に配列した全体概略図である。It is the whole schematic which arranged the waste-water-treatment device of the present invention in order of denitrification tank-nitrification tank-total oxidation tank. 本発明の改良された全酸化槽の概略図である。1 is a schematic diagram of an improved total oxidation bath of the present invention. 本発明の改良された別の全酸化槽の概略図である。FIG. 3 is a schematic diagram of another improved total oxidation bath of the present invention.

符号の説明Explanation of symbols

1 原水流入管
2 脱窒槽
3 攪拌装置
4 酵素添加装置
5 硝化槽
6 散気装置
7 排気筒
8 沈殿槽
9 全酸化槽
10 流出管
11 機械室
12 操作パネル
20 全酸化槽
21 処理水流入管
22 散気装置
23 沈殿槽
24 上下逆コーン形状円盤
25 駆動機
26 直胴折り返し
27 流出管
28 全酸化槽液面
29 処理水流入管
30 全酸化槽
31 流入管
32 導入口
33 レーキサポート
34 沈殿槽
35 上澄水流出部
36 流出ポンプ
37 流出管
38 汚泥排出ポンプ
39 汚泥排出管
40 汚泥排出管
41 全酸化槽の液面
42 レーキ
43 散気装置
DESCRIPTION OF SYMBOLS 1 Raw water inflow pipe 2 Denitrification tank 3 Stirrer 4 Enzyme addition apparatus 5 Nitrification tank 6 Aeration apparatus 7 Exhaust pipe 8 Precipitation tank 9 Total oxidation tank 10 Outflow pipe 11 Machine room 12 Operation panel 20 Total oxidation tank 21 Treated water inflow pipe 22 Scattering Ventilator 23 Precipitation tank 24 Upside-down inverted cone disk 25 Driver 26 Straight body folding 27 Outflow pipe 28 Total oxidation tank liquid level 29 Treated water inflow pipe 30 Total oxidation tank 31 Inflow pipe 32 Inlet 33 Rake support 34 Precipitation tank 35 Supernatant water Outflow section 36 Outflow pump 37 Outflow pipe 38 Sludge discharge pump 39 Sludge discharge pipe 40 Sludge discharge pipe 41 Liquid level of total oxidation tank 42 Rake 43 Air diffuser

Claims (9)

汚泥を自己酸化させるための全酸化槽であって、内部に沈殿槽を設けたことを特徴とする全酸化槽。 A total oxidation tank for self-oxidizing sludge, wherein a precipitation tank is provided inside. 該沈殿槽が、底板に代えて回転可能な上下逆コーン形状円盤を備えた沈殿槽である請求項1記載の全酸化槽。 The total oxidation tank according to claim 1, wherein the precipitation tank is a precipitation tank provided with a vertically inverted cone-shaped disk that can rotate instead of the bottom plate. 該沈殿槽が、槽壁面に処理水導入口を備え、槽中央部水面に上澄水流出部を有する沈殿槽である請求項1記載の全酸化槽。 2. The total oxidation tank according to claim 1, wherein the precipitation tank is a precipitation tank having a treated water inlet on the tank wall surface and having a supernatant water outflow part on the water surface in the center of the tank. 微生物固定化ゲル担体を流動させて排水と接触させるための処理槽と、内部に沈殿槽を設けた全酸化槽から構成された排水処理装置。 A wastewater treatment apparatus comprising a treatment tank for allowing a microorganism-immobilized gel carrier to flow and contact with wastewater, and a total oxidation tank provided with a precipitation tank inside. 該処理槽が、BOD処理槽、脱窒槽又は硝化槽である請求項4記載の排水処理装置。 The wastewater treatment apparatus according to claim 4, wherein the treatment tank is a BOD treatment tank, a denitrification tank, or a nitrification tank. 含油排水に酵素を添加した後、微生物固定化ゲル担体を流動させた処理槽で排水と接触させ、内部に沈殿槽を設けた全酸化槽で処理することを特徴とする排水処理方法。 A wastewater treatment method comprising: adding an enzyme to an oil-containing wastewater, bringing the microorganism-immobilized gel carrier into contact with wastewater in a treatment tank in which the microorganism-immobilized gel carrier is fluidized, and treating the wastewater in a total oxidation tank provided with a sedimentation tank. 該処理槽が、BOD処理槽、脱窒槽又は硝化槽である請求項6記載の排水処理方法。 The wastewater treatment method according to claim 6, wherein the treatment tank is a BOD treatment tank, a denitrification tank, or a nitrification tank. 該沈殿槽が、底板に代えて回転可能な上下逆コーン形状円盤を備えた沈殿槽である請求項6または7記載の排水処理方法。 The waste water treatment method according to claim 6 or 7, wherein the settling tank is a settling tank provided with a vertically inverted cone-shaped disk that can be rotated instead of the bottom plate. 該沈殿槽が、槽壁面に処理水導入口を備え、槽中央部水面に上澄水流出部を有する沈殿槽である請求項6または7記載の排水処理方法。 The waste water treatment method according to claim 6 or 7, wherein the sedimentation tank is a sedimentation tank having a treated water inlet on the tank wall surface and having a supernatant water outflow part on the water surface in the center of the tank.
JP2007193970A 2006-10-05 2007-07-26 Total oxidation tank, and apparatus and method for treating waste water by using the same Pending JP2008110333A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015073917A (en) * 2013-10-07 2015-04-20 株式会社クラレ Oil-containing wastewater treatment method
CN114735895A (en) * 2022-04-25 2022-07-12 北京四良科技有限公司 Device for quickly hydrolyzing biogas slurry and method for quickly hydrolyzing biogas slurry

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015073917A (en) * 2013-10-07 2015-04-20 株式会社クラレ Oil-containing wastewater treatment method
CN114735895A (en) * 2022-04-25 2022-07-12 北京四良科技有限公司 Device for quickly hydrolyzing biogas slurry and method for quickly hydrolyzing biogas slurry

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