JP2005161227A - Treatment method and apparatus for organic drainage - Google Patents

Treatment method and apparatus for organic drainage Download PDF

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JP2005161227A
JP2005161227A JP2003405039A JP2003405039A JP2005161227A JP 2005161227 A JP2005161227 A JP 2005161227A JP 2003405039 A JP2003405039 A JP 2003405039A JP 2003405039 A JP2003405039 A JP 2003405039A JP 2005161227 A JP2005161227 A JP 2005161227A
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sludge
biological treatment
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JP4314984B2 (en
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Shigeki Fujishima
繁樹 藤島
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Kurita Water Ind Ltd
栗田工業株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method of organic drainage capable of stably treating organic drainage at high treatment efficiency by treating it by a small apparatus with high load without deteriorating water quality, and also capable of reducing the generation amount of waste sludge, and an apparatus therefor. <P>SOLUTION: In a first biological treatment tank 1, aeration is performed by an aerator 6, and organic drainage is brought into contact with a biological membrane to be aerobically treated. Sludge in an outflow liquid of the first biological treatment tank 1 is microfabricated by a microfabrication device 2. In a second biological tank 3, aeration is performed by an aerator 11, thereby contacting liquid containing microfabricated sludge introduced from the microfabrication device 2 with activated sludge to be aerobically treated, thus treating the organic drainage. The liquid inside the second biological treatment tank 3 is subjected to membrane separation by a separation membrane module 13. The separated liquid is drained from a treated water channel 14, and concentrated liquid is drained from a sludge passage 15 as waste sludge. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、有機性排水を生物膜と接触させて好気性処理する第1生物処理工程と、第1生物処理工程の流出液を活性汚泥と接触させて好気性処理する第2生物処理工程とを含む有機性排水の処理方法および装置に関するものである。   The present invention includes a first biological treatment step in which organic wastewater is brought into contact with a biofilm and subjected to an aerobic treatment, and a second biological treatment step in which an effluent from the first biological treatment step is brought into contact with activated sludge to perform an aerobic treatment. The present invention relates to a method and apparatus for treating organic wastewater containing water.

有機性排水を生物処理する場合に用いられる活性汚泥法は、処理水質が高く、メンテナンスが容易であるなどの利点から、下水処理や産業廃水処理等に広く用いられている。しかしながら、運転に用いられるBOD容積負荷は0.5−0.8kg/m3/d程度で低いため、広い敷地面積が必要となる。また汚泥転換率が20%と高く、分解したBODの20%が菌体すなわち汚泥へと変換されるため、大量の余剰汚泥が発生し、その処理も問題となる。 The activated sludge method used when biologically treating organic wastewater is widely used for sewage treatment, industrial wastewater treatment, and the like because of its advantages such as high quality of treated water and easy maintenance. However, since the BOD volumetric load used for operation is as low as about 0.5 to 0.8 kg / m 3 / d, a large site area is required. Moreover, since the sludge conversion rate is as high as 20% and 20% of the decomposed BOD is converted into bacterial cells, that is, sludge, a large amount of excess sludge is generated, and its treatment also becomes a problem.

有機性排水の高負荷処理としては、担体を添加して生物膜を形成した流動床法が知られている。この方法を用いた場合、3kg/m3/d以上の高BOD容積負荷で運転することが可能となる。これにより曝気槽を小型化することができる反面、沈降分離しない微細汚泥が発生するため固液分離が困難になるほか、発生汚泥量は分解したBODの30%程度で、汚泥転換率が30%と通常の活性汚泥法より高くなり、余剰汚泥の処理量も多くなる。 As a high load treatment of organic waste water, a fluidized bed method in which a biofilm is formed by adding a carrier is known. When this method is used, it is possible to operate with a high BOD volume load of 3 kg / m 3 / d or more. This makes it possible to reduce the size of the aeration tank. On the other hand, fine sludge that does not settle and separate is generated, which makes it difficult to separate solid and liquid. And it becomes higher than the normal activated sludge method, and the amount of surplus sludge processing increases.

特許文献1では、担体を添加して生物膜を形成した流動床曝気槽の後段に、活性汚泥法による曝気槽を設ける方法が示されている。ここでは流動床曝気槽の後段に通常の活性汚泥処理槽を設けただけでは、汚泥転換率が高く余剰汚泥の発生量も多くなるので、流動床曝気槽の後段に2段の活性汚泥処理槽を用い、前段を比較的高負荷で運転し、後段を低負荷で運転することにより、余剰汚泥の発生量を低下させることができるとされている。しかしこのように2段の活性汚泥処理槽を用いると、装置も大型化し、操作も複雑である。   Patent Document 1 discloses a method of providing an aeration tank by an activated sludge method after a fluidized bed aeration tank in which a biofilm is formed by adding a carrier. Here, simply by providing a normal activated sludge treatment tank at the latter stage of the fluidized bed aeration tank, the sludge conversion rate is high and the amount of surplus sludge generated increases. Therefore, a two-stage activated sludge treatment tank at the latter stage of the fluidized bed aeration tank. It is said that the amount of excess sludge generated can be reduced by operating the former stage with a relatively high load and operating the latter stage with a low load. However, when the two-stage activated sludge treatment tank is used in this way, the apparatus becomes large and the operation is complicated.

特開平11−330166号公報JP-A-11-330166

本発明の課題は、小型の装置により高負荷で有機性排水を処理して、処理水質を悪化させることなく、高処理効率で安定して処理することができ、かつ余剰汚泥の発生量を低減することも可能な有機性排水の処理方法および装置を提供することである。   An object of the present invention is to treat organic wastewater with a high load by a small device, and can stably treat it with high treatment efficiency without deteriorating the quality of treated water, and reduce the amount of excess sludge generated. Another object of the present invention is to provide an organic wastewater treatment method and apparatus that can be used.

本発明は次の有機性排水の処理方法および装置である。
(1) 有機性排水を生物膜と接触させて好気性処理する第1生物処理工程と、
第1生物処理工程の流出液中の汚泥を微細化する微細化工程と、
微細化汚泥を含む液を活性汚泥と接触させて好気性処理する第2生物処理工程と
を含む有機性排水の処理方法。
(2) 第1生物処理工程の生物膜が担体に形成されたものである上記(1)記載の方法。
(3) 汚泥の微細化が超音波処理によるものである上記(1)または(2)記載の方法。
(4) 第2生物処理が浸漬膜分離式である上記(1)ないし(3)のいずれかに記載の方法。
(5) 有機性排水を生物膜と接触させて好気性処理する第1生物処理槽と、
第1生物処理工程の流出液中の汚泥を微細化する微細化手段と、
微細化汚泥を活性汚泥と接触させて好気性処理する第2生物処理槽と
を含む有機性排水の処理装置。
(6) 第1生物処理槽の生物膜が担体に形成されたものである上記(5)記載の装置。
(7) 汚泥の微細化が超音波処理によるものである上記(5)または(6)記載の装置。
(8) 第2生物処理槽が浸漬膜分離式である上記(5)ないし(7)のいずれかに記載の装置。
The present invention is the following organic wastewater treatment method and apparatus.
(1) a first biological treatment process in which organic wastewater is brought into contact with a biological film to perform aerobic treatment;
A refining process for refining sludge in the effluent of the first biological treatment process;
A second biological treatment step of aerobic treatment by bringing a liquid containing fine sludge into contact with activated sludge.
(2) The method according to (1) above, wherein the biofilm of the first biological treatment step is formed on a carrier.
(3) The method according to (1) or (2) above, wherein the sludge is refined by ultrasonic treatment.
(4) The method according to any one of (1) to (3), wherein the second biological treatment is an immersion membrane separation type.
(5) a first biological treatment tank that aerobically treats organic wastewater with biofilm;
Refining means for refining sludge in the effluent of the first biological treatment process;
An organic wastewater treatment apparatus comprising: a second biological treatment tank that aerobically treats refined sludge in contact with activated sludge.
(6) The apparatus according to (5) above, wherein the biofilm of the first biological treatment tank is formed on a carrier.
(7) The apparatus according to (5) or (6) above, wherein the sludge is refined by ultrasonic treatment.
(8) The apparatus according to any one of (5) to (7), wherein the second biological treatment tank is a submerged membrane separation type.

本発明の処理対象となる有機性排水は、有機物を含む排水であって、好気性生物処理可能な排水であれば制限はなく、食品工場やパルプ工場をはじめとした広い濃度範囲の有機性排水を処理対象とすることができ、高負荷処理が可能であるため、高濃度の有機性排水を処理対象としても処理が可能である。   The organic wastewater to be treated in the present invention is wastewater containing organic matter, and is not limited as long as it is a wastewater that can be treated aerobically, and organic wastewater in a wide concentration range including food factories and pulp factories. Can be treated, and high-load treatment is possible, so that treatment can be performed even with high-concentration organic wastewater.

本発明の有機性排水の処理方法では、第1生物処理工程において有機性排水を生物膜と接触させて好気性処理し、第1生物処理工程の流出液中の汚泥を微細化工程において微細化し、微細化汚泥を含む液を第2生物処理工程において活性汚泥と接触させて好気性処理することにより、有機性排水を処理する。   In the organic wastewater treatment method of the present invention, the organic wastewater is brought into contact with the biofilm in the first biological treatment step and subjected to aerobic treatment, and the sludge in the effluent of the first biological treatment step is refined in the refinement step. The organic waste water is treated by aerobic treatment by bringing the liquid containing the refined sludge into contact with the activated sludge in the second biological treatment step.

第1生物処理工程において有機性排水と接触させる生物膜は、好気性処理に用いられる細菌等の微生物によって形成される生物膜であって、一般には担体に形成された生物膜が用いられる。担体としては、生物膜が形成できるものであれば制限なく使用できるが、流動床を形成できるように粒状の担体が好ましく、形状は球状、ペレット状、中空筒状、糸状の任意であり、大きさ(粒径)も0.1−10mm程度の径のものが使用できる。材料は天然素材、無機素材、高分子素材等任意で、ゲル状物質を用いてもよい。特にスポンジのような多孔質のものを用いると、表面積が大きいので好ましい。このような生物膜は担体を好気性生物処理槽に投入し、そこへ有機性排水を導入して処理することにより自然発生的に形成されるが、他の処理施設等から導入してもよい。   The biofilm to be brought into contact with the organic waste water in the first biological treatment step is a biofilm formed by microorganisms such as bacteria used for aerobic treatment, and generally a biofilm formed on a carrier is used. The carrier can be used without limitation as long as it can form a biofilm, but a granular carrier is preferable so that a fluidized bed can be formed, and the shape is arbitrary such as a spherical shape, a pellet shape, a hollow cylindrical shape, and a thread shape. The diameter (particle diameter) can be about 0.1-10 mm. The material may be any natural material, inorganic material, polymer material, etc., and a gel material may be used. In particular, it is preferable to use a porous material such as a sponge because the surface area is large. Such a biofilm is spontaneously formed by introducing a carrier into an aerobic biological treatment tank and introducing organic waste water into the aerobic biological treatment tank, and may be introduced from other treatment facilities. .

第1生物処理工程は、第1生物処理槽において有機性排水を生物膜と接触させて好気性処理する。第1生物処理槽に生物膜を形成した担体を存在させ、流動床を形成して有機性排水を生物膜と接触させて好気性処理すると、第1生物処理槽には担体に形成された生物膜の他、非凝集性細菌、凝集性細菌、ならびに細菌群が密接に集まった生物膜の剥離片などが浮遊状に分散して流動床を形成し、これらが有機性排水と接触して好気性処理が行われる。これにより効率よく有機物の分解が行われ、高負荷で有機性排水を処理することができる。好気性処理は空気等の酸素含有ガスの導入により行われる。   In the first biological treatment step, the organic wastewater is brought into contact with the biological film in the first biological treatment tank to perform an aerobic treatment. When a carrier having a biofilm formed in the first biological treatment tank is present, a fluidized bed is formed, and organic wastewater is brought into contact with the biofilm to perform an aerobic treatment, the first biological treatment tank has an organism formed on the carrier. In addition to membranes, non-aggregating bacteria, agglutinating bacteria, and exfoliated pieces of biofilms in which bacterial groups closely gather are dispersed in a floating state to form a fluidized bed, which is favorable when in contact with organic wastewater. Tempering is performed. Thereby, the organic matter is efficiently decomposed, and the organic waste water can be treated with a high load. The aerobic treatment is performed by introducing an oxygen-containing gas such as air.

第1生物処理工程におけるBOD容積負荷は1kg/m3/d以上、好ましくは3〜10kg/m3/dとし、滞留時間(HRT)は10時間以下、好ましくは0.5〜5hとすることにより、非凝集性細菌が優占化した処理水を得ることができ、微細化工程における負荷を小さくすることができる。また、HRTを短くすることにより、BOD濃度の薄い排水を高負荷で処理することができるので好ましい。第1生物処理工程では、有機成分の80%以上、望ましくは85%以上が酸化分解されるように処理を行うことにより、第2生物処理工程における処理を効率化することができるので好ましい。 BOD volume load in the first biological treatment process is 1kg / m 3 / d or more, preferably a 3~10kg / m 3 / d, retention time (HRT) is 10 hours or less, preferably to 0.5~5h Thus, treated water in which non-aggregating bacteria are dominant can be obtained, and the load in the miniaturization process can be reduced. In addition, shortening the HRT is preferable because wastewater having a low BOD concentration can be treated with a high load. In the first biological treatment step, it is preferable to perform the treatment so that 80% or more, desirably 85% or more of the organic components are oxidatively decomposed, because the treatment in the second biological treatment step can be made efficient.

微細化工程では、第1生物処理工程の流出液中の汚泥を微細化する。第1生物処理工程の流出液中には、非凝集性細菌、凝集性細菌に加え、細菌群が密接に集まった生物膜の剥離片も含まれる。このうち非凝集性細菌、凝集性細菌および剥離片の一部は第2生物処理工程に導入されたとき、第2生物処理工程内の活性汚泥に取り込まれて分散ないしフロック形成をし、液中の有機物の分解に寄与したり自己消化する他、液中に棲息する原生動物や後生動物等の微小動物により捕食されるが、大型の凝集性細菌や剥離片などは沈降したり、自己消化が困難であったり、あるいは大きすぎて原生動物や後生動物等の微小動物による捕食が困難であって、余剰汚泥となって排出されることになる。   In the refinement process, the sludge in the effluent of the first biological treatment process is refined. In the effluent of the first biological treatment process, in addition to non-aggregating bacteria and aggregating bacteria, biofilm exfoliation pieces in which bacterial groups are closely gathered are also included. Among these, non-aggregating bacteria, aggregating bacteria and some exfoliated pieces are incorporated into the activated sludge in the second biological treatment process and dispersed or floc formed when introduced into the second biological treatment process. In addition to contributing to the decomposition of organic matter and self-digesting, it is preyed on by small animals such as protozoa and metazoans that inhabit the liquid. It is difficult or too large, and it is difficult to prey by tiny animals such as protozoa and metazoans, and it is discharged as excess sludge.

そこで微細化工程では、第1生物処理工程の流出液中の汚泥を微細化することにより、大型の凝集性細菌や剥離片などを微細化して分散、自己消化、微小動物による捕食などを容易にする。微細化手段としては、超音波処理が好ましいが、撹拌、ミル破砕、ホモジナイザー、キャビテーション等の物理的手段も利用可能であり、流出液中の汚泥を50μm以下、好ましくは5μm以下に微細化できるものが好ましい。超音波照射は流出液を槽内に導入して行ってもよく、流路で行ってもよい。超音波処理による凝集体細菌の微細化は特公昭57−144093号に示されているが、本発明では第1生物処理槽から流出する細菌の凝集体の微細化に加え、凝集体よりもさらに密集した生物膜の剥離片の細分化や糸状性細菌にからみついた細菌群の微細化、分散化も行われる。   Therefore, in the miniaturization process, the sludge in the effluent of the first biological treatment process is miniaturized to facilitate the dispersion, self-digestion, predation by small animals, etc. To do. Ultrasonic treatment is preferable as the means for refining, but physical means such as stirring, mill crushing, homogenizer, and cavitation can also be used, and sludge in the effluent can be refined to 50 μm or less, preferably 5 μm or less. Is preferred. The ultrasonic irradiation may be performed by introducing the effluent into the tank or may be performed in the flow path. The refinement of aggregate bacteria by sonication is shown in Japanese Patent Publication No. 57-144093, but in the present invention, in addition to the refinement of the aggregates of bacteria flowing out from the first biological treatment tank, it is further more than the aggregates. Subsequent fragmentation of dense biofilm exfoliation and micronization and dispersion of bacterial groups entangled with filamentous bacteria are also performed.

第2生物処理工程では、微細化工程において微細化した微細化汚泥を含む液を活性汚泥と接触させて好気性処理する。第2生物処理工程において用いられる第2生物処理槽は、一般的な活性汚泥処理に用いられている曝気槽を用いることができる。第2生物処理工程は、固液分離槽から汚泥返送を行う浮遊式活性汚泥法、担体を添加した流動床式活性汚泥法、または膜分離式活性汚泥法など、任意の方法を採用することができるが、膜分離式活性汚泥法を採用するのが好ましい。浮遊式活性汚泥法は被処理液とバルク状の活性汚泥を曝気槽において浮遊状態で混合曝気する方法である。流動床式活性汚泥法は第1生物処理工程と同様に、担体に活性汚泥を担持させ流動床を形成して有機性排水を接触させて混合曝気する方法である。膜分離式活性汚泥法は浮遊式活性汚泥法、流動床式活性汚泥法などにおいて、固液分離を膜分離で行う方法であり、UF膜、MF膜等の分離膜モジュールを曝気槽内に設置して膜分離しながら混合曝気する方法である。第2生物処理槽は2段以上としてもよい。   In the second biological treatment process, the liquid containing the refined sludge refined in the refinement process is brought into contact with the activated sludge to perform the aerobic treatment. The 2nd biological treatment tank used in a 2nd biological treatment process can use the aeration tank currently used for the general activated sludge process. The second biological treatment step may employ any method such as a floating activated sludge method for returning sludge from a solid-liquid separation tank, a fluidized bed activated sludge method to which a carrier is added, or a membrane separated activated sludge method. However, it is preferable to adopt a membrane separation type activated sludge method. The floating activated sludge method is a method in which the liquid to be treated and bulk activated sludge are mixed and aerated in a floating state in an aeration tank. Similar to the first biological treatment process, the fluidized bed activated sludge method is a method in which activated sludge is supported on a carrier to form a fluidized bed and contacted with organic waste water to perform mixed aeration. Membrane separation activated sludge method is a method that performs solid-liquid separation by membrane separation in floating activated sludge method, fluidized bed activated sludge method, etc., and separation membrane modules such as UF membrane and MF membrane are installed in the aeration tank Then, mixed aeration is performed while separating the membrane. The second biological treatment tank may have two or more stages.

第2生物処理工程では、活性汚泥を構成する細菌と、これらの細菌を捕食する原生動物や後生動物等の微小動物が共生する条件で処理を行うのが好ましく、これにより細菌による可溶性または懸濁性有機物の酸化分解を行うとともに、細菌の自己分解、ならびに微小動物による細菌の捕食を促して、余剰汚泥の発生量を減少させることができる。第2生物処理槽へ投入する第1生物処理槽からの流出水中に有機物が多量に残存すると、有機物を分解して細菌が増殖する。このとき細菌は微小動物に捕食されにくい細菌群の形態で増殖するため、このように増殖した細菌群は微小動物により捕食されず、細菌群の分解は自己消化のみに頼ることとなり、汚泥発生量低減の効果は低い。   In the second biological treatment step, the treatment is preferably carried out under the conditions in which bacteria constituting the activated sludge and protozoa and metazoans such as metazoans that prey on these bacteria coexist, and thereby soluble or suspended by the bacteria. It is possible to reduce the amount of excess sludge generated by promoting oxidative degradation of organic substances and promoting self-degradation of bacteria and predation of bacteria by minute animals. If a large amount of organic matter remains in the effluent water from the first biological treatment tank that is put into the second biological treatment tank, the organic matter is decomposed and bacteria grow. At this time, the bacteria grow in the form of bacterial groups that are hard to be preyed on by micro-animals. The effect of reduction is low.

そこで第1生物処理槽で有機物の大部分、例えば排水BODの80%以上、望ましくは90%以上分解し、菌体へと変換しておくと、細菌の増殖による細菌群の形成を防止することができる。この場合、第2生物処理槽に投入する第1生物処理水中のVSS(菌体濃度)/溶解性BOD濃度比は2以上、好ましくは3以上とするのが望ましい。また第2生物処理槽における溶解性BODによる汚泥負荷は0.1kg−BOD/kg−MLSS/d以下、好ましくは0.01〜0.1kg−BOD/kg−MLSS/d、滞留時間(HRT)は6時間以上、好ましくは8〜48hとすることが望ましい。   Therefore, when the first biological treatment tank decomposes most of the organic matter, for example, 80% or more, preferably 90% or more of the wastewater BOD, and converts it into microbial cells, it prevents the formation of bacterial groups due to bacterial growth. Can do. In this case, it is desirable that the VSS (bacterial cell concentration) / soluble BOD concentration ratio in the first biological treatment water introduced into the second biological treatment tank is 2 or more, preferably 3 or more. Moreover, the sludge load by the soluble BOD in the second biological treatment tank is 0.1 kg-BOD / kg-MLSS / d or less, preferably 0.01-0.1 kg-BOD / kg-MLSS / d, residence time (HRT) Is 6 hours or more, preferably 8 to 48 hours.

第2生物処理工程でこのような条件で処理を行うと、第1生物処理槽の流出水中に残存している有機成分は細菌により酸化分解されるが、細菌の増殖は少なく、流出水中に分散している非凝集性細菌、凝集性細菌および剥離生物膜の微細化物中の細菌は好気処理により自己分解するとともに、原生動物や後生動物等の微小動物に捕食され、処理液中の汚泥量は減少し、余剰汚泥の減量化が行われる。この場合、第1生物処理槽の流出水中の大型の凝集性細菌や剥離片などは、微細化工程で微細化されているので、細菌の菌体が分散して自己消化や微小動物による捕食などが容易になり、汚泥の減容化効率が高くなる。   When processing is performed under such conditions in the second biological treatment step, the organic components remaining in the effluent water of the first biological treatment tank are oxidatively decomposed by bacteria, but there is little growth of the bacteria and it is dispersed in the effluent water. Non-aggregating bacteria, aggregating bacteria, and bacteria in exfoliated biofilms are self-degraded by aerobic treatment and are preyed on by minute animals such as protozoa and metazoans, and the amount of sludge in the treatment liquid The amount of excess sludge will be reduced. In this case, because large flocculating bacteria and exfoliation pieces in the effluent of the first biological treatment tank are refined in the refinement process, the bacterial cells disperse and self-digest or prey by micro animals. And the sludge volume reduction efficiency is increased.

第2生物処理工程の処理液は固液分離され、分離液は排出される。浮遊式活性汚泥法の場合は、固液分離は固液分離槽で行われ、分離汚泥は第2生物処理工程に返送され、一部は余剰汚泥として排出される。流動床式活性汚泥法の場合は、剥離した汚泥が余剰汚泥として排出される。膜分離式活性汚泥法の場合は、固液分離は第2生物処理槽内で膜分離により行われ、濃縮汚泥の一部が余剰汚泥として排出される。   The treatment liquid of the second biological treatment process is separated into solid and liquid, and the separation liquid is discharged. In the case of the floating activated sludge method, solid-liquid separation is performed in a solid-liquid separation tank, the separated sludge is returned to the second biological treatment process, and a part is discharged as surplus sludge. In the case of the fluidized bed type activated sludge method, the separated sludge is discharged as excess sludge. In the case of the membrane separation type activated sludge method, solid-liquid separation is performed by membrane separation in the second biological treatment tank, and a part of the concentrated sludge is discharged as excess sludge.

本発明によれば、第1生物処理工程において有機性排水を生物膜と接触させて好気性処理し、第1生物処理工程の流出液中の汚泥を微細化工程において微細化し、微細化汚泥を含む液を第2生物処理工程において活性汚泥と接触させて好気性処理するようにしたので、小型の装置により高負荷で有機性排水を処理して、処理水質を悪化させることなく、高処理効率で安定して処理することができ、かつ余剰汚泥の発生量を低減することも可能である。   According to the present invention, the organic wastewater is brought into contact with the biofilm in the first biological treatment step and subjected to aerobic treatment, the sludge in the effluent of the first biological treatment step is refined in the refinement step, and the refined sludge is obtained. Since the contained liquid is aerobic treated by contacting it with activated sludge in the second biological treatment process, the organic wastewater is treated with a high load by a small device, and high treatment efficiency is achieved without deteriorating the quality of the treated water. Can be stably treated, and the amount of excess sludge generated can be reduced.

以下、本発明の実施形態を図面により説明する。図1は本発明の実施形態による有機性排水の処理方法および装置を示すフロー図である。図1において、1は、第1生物処理槽、2は微細化装置、3は第2生物処理槽である。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a method and apparatus for treating organic waste water according to an embodiment of the present invention. In FIG. 1, 1 is a 1st biological treatment tank, 2 is a refinement | miniaturization apparatus, 3 is a 2nd biological treatment tank.

第1生物処理槽1は、被処理水路5から導入された有機性排水を生物膜と接触させて好気性処理するように、生物膜を形成した担体4が投入されて流動床が形成され、曝気装置6に送気路7より空気を送って曝気し、有機性排水を生物膜と接触させて好気性処理するように構成されている。第1生物処理槽1では、担体に形成された生物膜の他、流動床を形成する非凝集性細菌、凝集性細菌、ならびに細菌群が密接に集まった生物膜の剥離片などが浮遊状に分散し、これらが有機性排水と接触して好気性処理が行われるように構成されている。8は担体4の流出を防ぐスクリーンである。   In the first biological treatment tank 1, the carrier 4 on which the biofilm is formed is introduced so that the organic wastewater introduced from the treated water channel 5 is brought into contact with the biofilm and subjected to aerobic treatment to form a fluidized bed, Air is sent to the aeration device 6 from the air supply path 7 for aeration, and the organic waste water is brought into contact with the biofilm for aerobic treatment. In the first biological treatment tank 1, in addition to the biofilm formed on the carrier, non-aggregating bacteria forming the fluidized bed, aggregating bacteria, and exfoliated pieces of the biofilm in which bacterial groups are closely gathered are suspended. The aerobic treatment is performed by dispersing and contacting these with organic waste water. A screen 8 prevents the carrier 4 from flowing out.

微細化装置2は、第1生物処理槽1から第2生物処理槽3への連絡路9に設けられ、流出液中の汚泥を微細化工程において微細化するように構成されている。微細化装置2としては超音波処理装置が用いられ、第1生物処理工程の流出液中の非凝集性細菌、凝集性細菌、細菌群が密接に集まった生物膜の剥離片などのうち、特に大型のものを超音波処理により微細化するように構成されている。   The micronizer 2 is provided in the communication path 9 from the first biological treatment tank 1 to the second biological treatment tank 3, and is configured to refine the sludge in the effluent in the micronization process. As the miniaturization device 2, an ultrasonic treatment device is used, and among the non-aggregating bacteria, the agglutinating bacteria, the biofilm exfoliation pieces in which the bacterial group is closely gathered in the effluent of the first biological treatment process, A large size is configured to be miniaturized by ultrasonic treatment.

第2生物処理槽3は曝気装置11が設けられ、送気路12から空気を送って曝気することにより、微細化工程において微細化した微細化汚泥を含む液を活性汚泥と接触させて好気性処理するように構成されている。第2生物処理槽は、一般的な活性汚泥処理に用いられている浮遊式の曝気槽が採用され、UF膜、MF膜等の分離膜モジュール13を槽内に設置して膜分離し、分離液を処理水路14から排出するように構成されている。15は濃縮液を余剰汚泥として排出する排泥路である。   The second biological treatment tank 3 is provided with an aeration device 11 and aerobic by bringing the liquid containing the refined sludge refined in the refinement process into contact with the activated sludge by sending air from the air supply passage 12 and aeration. Configured to process. The second biological treatment tank is a floating aeration tank used for general activated sludge treatment. A separation membrane module 13 such as a UF membrane or MF membrane is installed in the tank for membrane separation and separation. The liquid is discharged from the treatment water channel 14. Reference numeral 15 denotes a drainage passage for discharging the concentrated liquid as excess sludge.

上記の処理装置による有機性排水の処理方法は、第1生物処理工程として、第1生物処理槽1において、送気路7より曝気装置6に送られる空気により曝気して、被処理水路5から導入される有機性排水を生物膜と接触させて好気性処理する。そして微細化工程では、微細化装置2により第1生物処理槽1の流出液中の汚泥を微細化する。第2生物処理工程は第2生物処理槽3において、送気路12から送られる空気を曝気装置11より曝気することにより、微細化装置2から導入される微細化された微細化汚泥を含む液を、活性汚泥と接触させて好気性処理することにより有機性排水を処理する。第2生物処理槽3の槽内液は分離膜モジュール13により膜分離し、分離液を処理水として処理水路14から排出し、濃縮液は余剰汚泥として排泥路15から排出する。   In the first biological treatment tank 1, the organic wastewater treatment method using the treatment device described above is aerated in the first biological treatment tank 1 by the air sent from the air supply passage 7 to the aeration device 6. The organic wastewater introduced is brought into contact with the biofilm for aerobic treatment. In the refinement process, the sludge in the effluent of the first biological treatment tank 1 is refined by the refiner 2. In the second biological treatment tank 3, the liquid containing the refined refined sludge introduced from the refiner 2 by aerating the air sent from the air supply path 12 from the aerator 11 in the second biological treatment tank 3. The organic waste water is treated by aerobic treatment in contact with activated sludge. The liquid in the tank of the second biological treatment tank 3 is subjected to membrane separation by the separation membrane module 13, the separated liquid is discharged from the treated water channel 14 as treated water, and the concentrated liquid is discharged from the mud discharge passage 15 as excess sludge.

第1生物処理槽1では、生物膜を形成した担体4を存在させ、流動床を形成して有機性排水を生物膜と接触させて好気性処理することにより、第1生物処理槽1内には担体4に形成された生物膜の他、非凝集性細菌、凝集性細菌、ならびに細菌群が密接に集まった生物膜の剥離片などが浮遊状に分散して流動床を形成し、これらが有機性排水と接触して好気性処理が行われる。これにより効率よく有機物の分解が行われ、高負荷で有機性排水を処理することができる。第1生物処理槽1では、前記処理条件により有機成分の80%以上、望ましくは90%以上が酸化分解されるように処理を行う。   In the 1st biological treatment tank 1, the carrier 4 which formed the biofilm is made to exist, and a fluidized bed is formed, an organic waste water is made to contact a biofilm, and an aerobic treatment is carried out, The 1st biological treatment tank 1 In addition to the biofilm formed on the carrier 4, non-aggregating bacteria, agglutinating bacteria, and exfoliated pieces of the biofilm in which bacterial groups are closely gathered are dispersed in a floating state to form a fluidized bed. Aerobic treatment is performed in contact with organic waste water. Thereby, the organic matter is efficiently decomposed, and the organic waste water can be treated with a high load. In the first biological treatment tank 1, the treatment is performed so that 80% or more, desirably 90% or more of the organic components are oxidatively decomposed according to the treatment conditions.

微細化装置2では、超音波処理により第1生物処理工程の流出液中の汚泥を微細化する。超音波処理で微細化することにより、第1生物処理槽1から流出する細菌の凝集体の微細化に加え、凝集体よりもさらに密集した生物膜の剥離片の細分化や糸状性細菌にからみついた細菌群の微細化、分散化も行うことができる。これにより第2生物処理槽3における細菌の自己消化、微小動物による捕食などが容易になる。   In the refinement | miniaturization apparatus 2, the sludge in the effluent of a 1st biological treatment process is refined | miniaturized by ultrasonic treatment. By refinement by ultrasonic treatment, in addition to the refinement of bacterial aggregates flowing out from the first biological treatment tank 1, the separation of biofilm exfoliation fragments and filamentous bacteria that are more dense than the aggregates It is also possible to refine and disperse the found bacteria group. Thereby, self-digestion of bacteria in the second biological treatment tank 3, predation by micro animals, and the like are facilitated.

第2生物処理槽3では、活性汚泥を構成する細菌と、これらの細菌を捕食する原生動物や後生動物等の微小動物が共生する条件で好気性処理を行うので、細菌による可溶性または懸濁性有機物の酸化分解を行うとともに、細菌の自己分解、ならびに微小動物による細菌の捕食を促して、余剰汚泥の発生量を減少させることができる。第2生物処理槽3へ投入する第1生物処理槽1からの流出水中に有機物が多量に残存すると、細菌は有機物を分解して微小動物に捕食されにくい細菌群の形態で増殖するので、第1生物処理槽1で有機物の大部分、例えば排水BODの80%以上、望ましくは90%以上分解しておくと、細菌の増殖を防止することができる。   In the second biological treatment tank 3, since the aerobic treatment is performed under the condition that the bacteria constituting the activated sludge and the protozoa and metazoans that prey on these bacteria coexist, they are soluble or suspended by the bacteria. In addition to oxidative decomposition of organic matter, it is possible to reduce the amount of excess sludge generated by promoting the self-degradation of bacteria and the predation of bacteria by minute animals. If a large amount of organic matter remains in the effluent water from the first biological treatment tank 1 that is put into the second biological treatment tank 3, the bacteria grow in the form of bacteria that decompose the organic matter and are not easily preyed by micro-animals. If most of the organic matter, for example, 80% or more, preferably 90% or more of the waste water BOD is decomposed in one biological treatment tank 1, the growth of bacteria can be prevented.

第2生物処理槽3において前記条件で処理を行うことにより、第1生物処理槽1の流出水中に残存している有機成分は、共生する細菌により酸化分解されるが、細菌の増殖は少なく、流出水中に分散している非凝集性細菌、凝集性細菌および剥離生物膜の微細化物中の細菌は好気処理により自己分解するとともに、原生動物や後生動物等の微小動物に捕食され、処理液中の汚泥量は減少し、余剰汚泥の減量化が行われる。この場合、第1生物処理槽1の流出水中の大型の凝集性細菌や剥離片などは、微細化装置2で微細化されているので、細菌の菌体が分散して自己消化や微小動物による捕食などが容易になり、汚泥の減容化効率が高くなる。   By performing the treatment under the above conditions in the second biological treatment tank 3, the organic components remaining in the effluent of the first biological treatment tank 1 are oxidatively decomposed by the symbiotic bacteria, but the growth of the bacteria is small. Non-aggregating bacteria, aggregating bacteria and bacteria in exfoliated biofilms that are dispersed in the effluent are self-degraded by aerobic treatment and are preyed on by micro-animals such as protozoa and metazoans. The amount of sludge inside will be reduced, and excess sludge will be reduced. In this case, since large flocculating bacteria, exfoliation pieces, and the like in the effluent of the first biological treatment tank 1 are miniaturized by the micronizer 2, the bacterial cells are dispersed to cause self-digestion or microanimals. Predation becomes easy, and sludge volume reduction efficiency increases.

第2生物処理槽3の槽内液は分離膜モジュール13により固液分離されるが、第2生物処理槽3が浮遊式活性汚泥法の場合は、固液分離は別の固液分離槽で行われ、分離汚泥の一部は第2生物処理槽3に返送され、一部は余剰汚泥として排出される。第2生物処理槽3が流動床式活性汚泥法の場合は、剥離した汚泥が余剰汚泥として排出される。   The liquid in the tank of the second biological treatment tank 3 is solid-liquid separated by the separation membrane module 13, but when the second biological treatment tank 3 is a floating activated sludge method, the solid-liquid separation is performed in another solid-liquid separation tank. It is carried out and a part of the separated sludge is returned to the second biological treatment tank 3 and a part thereof is discharged as surplus sludge. When the second biological treatment tank 3 is a fluidized bed activated sludge method, the separated sludge is discharged as excess sludge.

上記のように、第1生物処理槽1において有機性排水を生物膜と接触させて好気性処理し、第1生物処理槽1の流出液中の汚泥を微細化装置2において微細化し、微細化汚泥を含む液を第2生物処理槽3において活性汚泥と接触させて好気性処理することにより、小型の装置により高負荷で有機性排水を処理して、処理水質を悪化させることなく、高処理効率で安定して処理することができ、かつ余剰汚泥の発生量を低減することも可能である。   As described above, the organic wastewater is brought into contact with the biofilm in the first biological treatment tank 1 for aerobic treatment, and the sludge in the effluent of the first biological treatment tank 1 is refined by the refiner 2 and refined. By treating the liquid containing sludge with the activated sludge in the second biological treatment tank 3 for aerobic treatment, the organic wastewater is treated with a small load at a high load without deteriorating the quality of the treated water. It is possible to process stably and efficiently, and to reduce the amount of excess sludge generated.

実施例1:
図1の装置を、生物膜を形成したスポンジ担体4が投入されて流動床が形成された容量3.5Lの第1生物処理槽1と、超音波処理による微細化装置2と、分離膜モジュール13を槽内に設置した15Lの浸積膜式活性汚泥槽からなる第2生物処理槽3で構成して、有機性排水を処理した。担体4として添加したスポンジは3mm角で、第1生物処理槽1の有効容積の25%投入した。超音波処理の条件は125W、30minとした。第1生物処理槽1に対する溶解性BOD容積負荷は4.3kg−BOD/m3/d、HRT1.9h、有機物除去率88%、第2生物処理槽3の溶解性BOD汚泥負荷は0.022kg−BOD/kg−MLSS/d、HRT8.3h、全体のBOD容積負荷0.84kg−BOD/m3/d、HRT10.2hの条件で運転したところ、処理水は良好で、汚泥転換率は0・07kg−MLSS/kg−BODとなった。なお、第2生物処理槽3には、微小動物がVSS当り25%と高い割合で認められた。処理開始4ヶ月後の結果を表1に示す。
Example 1:
The apparatus shown in FIG. 1 includes a first biological treatment tank 1 having a capacity of 3.5 L in which a fluidized bed is formed by introducing a sponge carrier 4 in which a biological film is formed, a miniaturization apparatus 2 by ultrasonic treatment, and a separation membrane module. 13 was comprised in the 2nd biological treatment tank 3 which consists of a 15L immersion membrane type activated sludge tank installed in the tank, and processed organic waste water. The sponge added as the carrier 4 was 3 mm square, and 25% of the effective volume of the first biological treatment tank 1 was charged. The ultrasonic treatment conditions were 125 W and 30 min. The soluble BOD volumetric load on the first biological treatment tank 1 is 4.3 kg-BOD / m 3 / d, HRT 1.9 h, the organic matter removal rate is 88%, and the soluble BOD sludge load on the second biological treatment tank 3 is 0.022 kg. -When operating under conditions of BOD / kg-MLSS / d, HRT 8.3h, overall BOD volume load 0.84kg-BOD / m 3 / d, HRT 10.2h, the treated water was good and the sludge conversion rate was 0. -It became 07 kg-MLSS / kg-BOD. In the second biological treatment tank 3, minute animals were observed at a high rate of 25% per VSS. The results after 4 months from the start of treatment are shown in Table 1.

比較例1:
実施例1の第2生物処理槽3に相当する15Lの浸積膜式活性汚泥槽からなる生物処理装置を用い、第1生物処理槽1および微細化装置2を用いることなく、実施例1と同様に処理を行った。溶解性BOD容積負荷は0.84kg−BOD/m3/d、HRT10.2hの条件で運転したところ、処理水は良好だったものの、汚泥転換率は0.42kg一MLSS/kg−BODとなった。処理開始4ヶ月後の結果を表1に示す。
Comparative Example 1:
Using a biological treatment apparatus consisting of a 15 L immersion membrane activated sludge tank corresponding to the second biological treatment tank 3 of Example 1, and without using the first biological treatment tank 1 and the micronizer 2, Processing was carried out in the same manner. Dissolved BOD volumetric load was 0.84kg-BOD / m 3 / d and HRT was 10.2h. The treated water was good, but the sludge conversion rate was 0.42kg per MLSS / kg-BOD. It was. The results after 4 months from the start of treatment are shown in Table 1.

比較例2:
実施例1の第1生物処理槽1に相当するスポンジ担体流動床が形成された容量3.5Lの第1生物処理槽1と、第2生物処理槽3に相当する15Lの浸積膜式活性汚泥槽からなる生物処理装置を用い、微細化装置2を用いることなく、実施例1と同様に処理を行った。担体4として添加したスポンジは3mm角で、第1生物処理槽1の有効容積の25%投入した。第1生物処理槽1に対する溶解性BOD容積負荷は4.3kg−BOD/m3/d、HRT1.9h、第2生物処理槽3の溶解性BOD汚泥負荷は0.022kgBOD/kg一MLSS/d、HRT8.3h、全体のBOD容積負荷0.84kg−BOD/m3/d、HRT10.2hの条件で運転したところ、処理水は良好だったが、汚泥転換率は0.14−0.20kg−MLSS/kg−BODと幅があった。処理開始4ヶ月後の結果を表1に示す。
Comparative Example 2:
A first biological treatment tank 1 having a capacity of 3.5 L on which a sponge carrier fluidized bed corresponding to the first biological treatment tank 1 of Example 1 is formed, and a 15 L immersion membrane type activity corresponding to the second biological treatment tank 3. The treatment was performed in the same manner as in Example 1 using the biological treatment device composed of a sludge tank and not using the micronizer 2. The sponge added as the carrier 4 was 3 mm square, and 25% of the effective volume of the first biological treatment tank 1 was charged. The soluble BOD volumetric load on the first biological treatment tank 1 is 4.3 kg-BOD / m 3 / d, HRT 1.9 h, and the soluble BOD sludge load on the second biological treatment tank 3 is 0.022 kgBOD / kg per MLSS / d. , HRT 8.3h, overall BOD volumetric load 0.84kg-BOD / m 3 / d, HRT 10.2h, the treated water was good, sludge conversion rate was 0.14-0.20kg -There was a width of MLSS / kg-BOD. The results after 4 months from the start of treatment are shown in Table 1.

食品工場やパルプ工場をはじめとした広い濃度範囲の有機性排水を処理対象として、小型の装置により高負荷処理を行い、余剰汚泥の発生量を低減する有機性排水の処理方法および装置に利用される。   It is used for organic wastewater treatment methods and equipment that treat organic wastewater in a wide concentration range such as food factories and pulp factories with high load treatment with a small device and reduce the amount of excess sludge generated. The

実施形態による含窒素有機性排水の処理方法および装置を示すフロー図である。It is a flowchart which shows the processing method and apparatus of the nitrogen-containing organic waste_water | drain by embodiment.

符号の説明Explanation of symbols

1 第1生物処理槽
2 微細化装置
3 第2生物処理槽
4 担体
5 被処理水路
6、11 曝気装置
7、12 送気路
8 スクリーン
13 膜モジュール
14 処理水路
15 排泥路
DESCRIPTION OF SYMBOLS 1 1st biological treatment tank 2 Miniaturization apparatus 3 2nd biological treatment tank 4 Carrier 5 Processed water channel 6, 11 Aeration apparatus 7, 12 Air supply path 8 Screen 13 Membrane module 14 Process water channel 15 Drainage path

Claims (8)

有機性排水を生物膜と接触させて好気性処理する第1生物処理工程と、
第1生物処理工程の流出液中の汚泥を微細化する微細化工程と、
微細化汚泥を含む液を活性汚泥と接触させて好気性処理する第2生物処理工程と
を含む有機性排水の処理方法。
A first biological treatment process in which organic wastewater is brought into contact with a biofilm to perform aerobic treatment;
A refining process for refining sludge in the effluent of the first biological treatment process;
A second biological treatment step of aerobic treatment by bringing a liquid containing fine sludge into contact with activated sludge.
第1生物処理工程の生物膜が担体に形成されたものである請求項1記載の方法。   The method according to claim 1, wherein the biofilm of the first biological treatment step is formed on a carrier. 汚泥の微細化が超音波処理によるものである請求項1または2記載の方法。   The method according to claim 1 or 2, wherein the sludge is refined by ultrasonic treatment. 第2生物処理が浸漬膜分離式である請求項1ないし3のいずれかに記載の方法。   The method according to any one of claims 1 to 3, wherein the second biological treatment is an immersion membrane separation type. 有機性排水を生物膜と接触させて好気性処理する第1生物処理槽と、
第1生物処理工程の流出液中の汚泥を微細化する微細化手段と、
微細化汚泥を活性汚泥と接触させて好気性処理する第2生物処理槽と
を含む有機性排水の処理装置。
A first biological treatment tank that aerobically treats organic wastewater with a biofilm;
Refining means for refining sludge in the effluent of the first biological treatment process;
An organic wastewater treatment apparatus comprising: a second biological treatment tank that aerobically treats refined sludge in contact with activated sludge.
第1生物処理槽の生物膜が担体に形成されたものである請求項5記載の装置。   The apparatus according to claim 5, wherein the biofilm of the first biological treatment tank is formed on a carrier. 汚泥の微細化が超音波処理によるものである請求項5または6記載の装置。   The apparatus according to claim 5 or 6, wherein the sludge is refined by ultrasonic treatment. 第2生物処理槽が浸漬膜分離式である請求項5ないし7のいずれかに記載の装置。   The apparatus according to any one of claims 5 to 7, wherein the second biological treatment tank is a submerged membrane separation type.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006082024A (en) * 2004-09-16 2006-03-30 Kurita Water Ind Ltd Biological treatment apparatus
JP2016123920A (en) * 2014-12-26 2016-07-11 オルガノ株式会社 Wastewater treatment apparatus and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006082024A (en) * 2004-09-16 2006-03-30 Kurita Water Ind Ltd Biological treatment apparatus
JP4492268B2 (en) * 2004-09-16 2010-06-30 栗田工業株式会社 Biological treatment equipment
JP2016123920A (en) * 2014-12-26 2016-07-11 オルガノ株式会社 Wastewater treatment apparatus and method

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