JP5008249B2 - Deodorization method and apparatus - Google Patents

Deodorization method and apparatus Download PDF

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JP5008249B2
JP5008249B2 JP2003273884A JP2003273884A JP5008249B2 JP 5008249 B2 JP5008249 B2 JP 5008249B2 JP 2003273884 A JP2003273884 A JP 2003273884A JP 2003273884 A JP2003273884 A JP 2003273884A JP 5008249 B2 JP5008249 B2 JP 5008249B2
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信博 織田
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本発明は、アンモニア、アミン等のアンモニア性または有機性窒素成分を含有する臭気ガスを吸収液と接触させて脱臭し、吸収液中のアンモニア性窒素を生物学的に酸化および脱窒する脱臭方法および装置に関するものである。   The present invention relates to a deodorizing method for biologically oxidizing and denitrifying ammonia nitrogen in an absorbing solution by deodorizing an odor gas containing ammonia or organic nitrogen components such as ammonia and amine with an absorbing solution. And the apparatus.

アンモニア、アミン類等の臭気成分を含有する臭気ガスは、吸収液と接触させることにより、臭気成分は吸収液水側に移行するため脱臭することができる。この方法では吸収液に吸収された臭気成分を処理する必要があり、このような臭気成分を含有する吸収液の処理方法としては、硝化細菌を利用して生物学的に硝酸化する方法が提案されている。このように細菌を利用して生物学的硝酸化する方法では、吸収液中に硝化細菌を存在させることにより脱臭と硝酸化を同時に行うことができ、硝化細菌を担持した充填層に臭気ガスと吸収液を供給して接触させることにより、脱臭と硝酸化を同時に行うことも行われている。   The odor gas containing odor components such as ammonia and amines can be deodorized by bringing the odor component into contact with the absorbing solution, so that the odor component moves to the absorbing solution water side. In this method, it is necessary to treat the odor component absorbed in the absorption liquid, and as a treatment method for the absorption liquid containing such an odor component, a method of biological nitrification using nitrifying bacteria is proposed. Has been. Thus, in the method of biological nitrification using bacteria, deodorization and nitrification can be performed simultaneously by the presence of nitrifying bacteria in the absorption liquid, and odor gas and Deodorization and nitrification are also performed simultaneously by supplying and contacting the absorbing liquid.

これらの方法では、臭気ガスから吸収したアンモニア、アミン等の臭気成分を硝化細菌により酸化して亜硝酸および硝酸へ変換するが、生成した亜硝酸および硝酸がアンモニアやアミンの吸収を促進する効果もある。一般的に微生物には活動できる至適pH領域が存在し、硝化細菌の場合、至適pH領域が中性付近のpH=6.5〜8.5であるため、上記のように亜硝酸および硝酸が大量に存在する酸性域では硝化細菌の活性は低下する。一方、アンモニアはアルカリ性のため、さらにアンモニアガスが吸収されてアンモニアが亜硝酸および硝酸と当量になれば、吸収液は中性となり、硝化細菌の活性は回復する。このため吸収液は、常にpHを硝化細菌の至適pH域に制御する必要がある。   In these methods, odorous components such as ammonia and amine absorbed from odorous gas are oxidized by nitrifying bacteria and converted to nitrous acid and nitric acid, but the generated nitrous acid and nitric acid also have the effect of promoting the absorption of ammonia and amines. is there. In general, microorganisms have an optimum pH range in which they can act. In the case of nitrifying bacteria, the optimum pH range is around pH = 6.5 to 8.5. In the acidic region where nitric acid is present in large quantities, the activity of nitrifying bacteria decreases. On the other hand, since ammonia is alkaline, if the ammonia gas is further absorbed and becomes equivalent to nitrous acid and nitric acid, the absorbing solution becomes neutral and the activity of nitrifying bacteria is restored. For this reason, it is necessary for the absorbing solution to always control the pH within the optimum pH range of nitrifying bacteria.

そこで、吸収液にアルカリである水酸化ナトリウムを添加して脱臭する方法も提案されている。この方法では、アンモニア、アミン類等の臭気成分を亜硝酸または硝酸に酸化して中和するのみであり、亜硝酸または硝酸のアンモニウムやアミン塩が濃縮されるため、それらの排出および処理が必要である。   Therefore, a method of deodorizing by adding sodium hydroxide, which is an alkali, to the absorbing solution has also been proposed. In this method, odorous components such as ammonia and amines are only oxidized and neutralized to nitrous acid or nitric acid, and ammonium and amine salts of nitrous acid or nitric acid are concentrated. It is.

また、脱窒層(あるいは脱窒部)を設け、発生した亜硝酸および硝酸を従属栄養細菌である脱窒細菌により脱窒して除去する方法もある。しかしこの方法では、従属栄養細菌を利用するため栄養を添加する必要があるほか、脱窒には全ての窒素を亜硝酸あるいは硝酸にまで酸化するため曝気動力費が高額となるとともに、脱窒細菌による汚泥生成量が多くて廃棄物が多くなるなどの問題があった。   There is also a method in which a denitrification layer (or denitrification part) is provided, and the generated nitrous acid and nitric acid are denitrified and removed by a denitrifying bacterium that is a heterotrophic bacterium. However, in this method, it is necessary to add nutrients to use heterotrophic bacteria, and denitrification oxidizes all nitrogen to nitrous acid or nitric acid. There was a problem such as a large amount of sludge generated due to the waste and a lot of waste.

従来、アンモニア性窒素を含有する有機性廃液の処理方法において、廃液中のアンモニア性窒素を亜硝酸化細菌により亜硝酸化し、生成する亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する処理方法が知られている。しかしアナモックス細菌は硝酸性窒素を資化できず、脱窒できないため、亜硝酸化工程において硝酸性窒素が生成しないように亜硝酸化を行う必要がある。ところが有機性廃液の場合、硝酸性窒素が生成しないように亜硝酸化を行うのは困難であり、また脱窒効果を高く維持するのは困難であり、この方法をそのまま脱臭に適用することはできない。   Conventionally, in the treatment method of organic waste liquid containing ammonia nitrogen, ammonia nitrogen in waste liquid is nitritized by nitrite bacteria, and the produced nitrite is anammox bacteria by ammonia nitrogen and nitrite A treatment method for reacting nitrogen with denitrification is known. However, since anammox bacteria cannot assimilate nitrate nitrogen and cannot denitrify, it is necessary to perform nitritation so that nitrate nitrogen is not generated in the nitritation step. However, in the case of organic waste liquid, it is difficult to nitrite so that nitrate nitrogen is not generated, and it is difficult to maintain a high denitrification effect. Can not.

本発明の課題は、簡単な装置と操作により、栄養や中和剤などを添加する必要がなく、少ない動力費でアンモニア、アミン類等の臭気成分を含有する臭気ガスから臭気成分を、安全かつ効率よく除去することができ、発生する汚泥その他の廃棄物量も少ない脱臭方法および装置を提供することである。   The object of the present invention is to eliminate odor components from odor gas containing odor components such as ammonia and amines at a low power cost, without the need to add nutrients and neutralizing agents, etc. with a simple apparatus and operation. An object of the present invention is to provide a deodorization method and apparatus that can be efficiently removed and that generates less sludge and other waste.

本発明は次の脱臭方法および装置である。
(1) 臭気ガスを吸収液と接触させて脱臭する脱臭工程と、
吸収液中のアンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、亜硝酸アンモニウムを生成させる亜硝酸化工程と、
亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する脱窒工程とを含み、
脱臭工程、亜硝酸化工程及び脱窒工程に供給する吸収液をアンモニア性窒素濃度50〜400mg/L、亜硝酸性窒素濃度40〜300mg/L、pH6.5〜7.5とし、
吸収液を脱臭工程、亜硝酸化工程および脱窒工程間で循環する脱臭方法。
(2) 脱臭工程と亜硝酸化工程を同時に、または別々に行う上記(1)記載の方法。
(3) 臭気ガスを吸収液と接触させて脱臭する脱臭手段と、
吸収液中のアンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、亜硝酸アンモニウムを生成させる亜硝酸化手段と、
亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する脱窒手段と、
脱臭手段、亜硝酸化手段および脱窒手段間で吸収液を循環する循環路とを含み、
脱臭手段、亜硝酸化手段及び脱窒手段に供給する吸収液がアンモニア性窒素濃度50〜400mg/L、亜硝酸性窒素濃度40〜300mg/L、pH6.5〜7.5である脱臭装置。
(4) 脱臭手段と亜硝酸化手段同一の手段、または別の手段として設けられた上記(3)記載の装置。
(5) 脱窒手段へ供給する液量が、脱臭手段及び/又は亜硝酸化手段へ供給する液量の1/10以下である上記(3)または(4)記載の装置。
The present invention is the following deodorizing method and apparatus.
(1) a deodorizing step of deodorizing the odor gas by contacting the absorbing liquid;
Nitrite that produces ammonium nitrite by supplying oxygen so that ammonia nitrogen remains in the absorption liquid by nitrifying bacteria, leaving ammonia nitrogen to remain at 50 mg / L or more, and nitrifying so that nitric acid is not generated. Process,
The anammox bacteria nitritation solution, viewed contains a denitrification step of denitrification by reacting ammonia nitrogen and nitrite nitrogen,
The absorbent supplied to the deodorizing step, nitrifying step and denitrifying step is ammonia nitrogen concentration 50 to 400 mg / L, nitrite nitrogen concentration 40 to 300 mg / L, pH 6.5 to 7.5,
A deodorization method in which an absorbing solution is circulated between a deodorization step, a nitritation step and a denitrification step .
(2) The method according to (1) above, wherein the deodorization step and the nitritation step are performed simultaneously or separately.
(3) deodorizing means for deodorizing the odor gas by contacting the absorbing liquid;
Nitrite that produces ammonium nitrite by supplying oxygen so that ammonia nitrogen remains in the absorption liquid by nitrifying bacteria, leaving ammonia nitrogen to remain at 50 mg / L or more, and nitrifying so that nitric acid is not generated. Means,
A denitrification means for denitrifying the nitrite by reacting ammonia nitrogen and nitrite nitrogen with anammox bacteria ,
A circuit for circulating the absorbent between the deodorizing means, the nitrifying means and the denitrifying means,
A deodorizing apparatus in which the absorbing liquid supplied to the deodorizing means, the nitrifying means, and the denitrifying means is an ammonia nitrogen concentration of 50 to 400 mg / L, a nitrite nitrogen concentration of 40 to 300 mg / L, and a pH of 6.5 to 7.5 .
(4) deodorizing means and nitrous oxide means the same means or separate the provided as means (3) Apparatus according.
(5) The apparatus according to (3) or (4) above , wherein the amount of liquid supplied to the denitrification means is 1/10 or less of the amount of liquid supplied to the deodorization means and / or nitritation means.

本発明において、脱臭の対象となる臭気ガスは、臭気成分としてアンモニア、アミン等のアンモニア性または有機性窒素成分を含有する臭気ガスである。このような臭気成分は、脱臭工程および亜硝酸化工程において、アンモニアを生成する成分を含むものであればよい。このような臭気成分を含む臭気ガスとしては、し尿、下水、その他の有機物から発生する臭気ガス、有機性廃水処理設備等から発生する排気ガスなどが挙げられる。   In the present invention, the odor gas to be deodorized is an odor gas containing ammonia or an organic nitrogen component such as ammonia or amine as the odor component. Such an odor component should just contain the component which produces | generates ammonia in a deodorizing process and a nitritation process. Examples of the odor gas containing such odor components include odor gas generated from human waste, sewage and other organic substances, exhaust gas generated from organic wastewater treatment facilities, and the like.

本発明において、脱臭工程で用いられる脱臭手段は、臭気ガスを吸収液と接触させて臭気成分を吸収液に吸収させて、臭気ガスを脱臭するように構成される。接触方法は限定されず、スプレー式、充填塔式、散気式、攪拌式など、一般的な気液接触方法を採用することができる。脱臭工程では、吸収液中に吸収された有機物等の成分を酸化分解できるように、酸素を供給できるように構成するのが好ましいが、臭気ガスが酸素を含む場合は臭気ガスの酸素を利用できる。   In the present invention, the deodorizing means used in the deodorizing step is configured to deodorize the odor gas by bringing the odor gas into contact with the absorption liquid and absorbing the odor component into the absorption liquid. The contact method is not limited, and general gas-liquid contact methods such as a spray method, a packed tower method, an air diffusion method, and a stirring method can be employed. In the deodorization step, it is preferable that oxygen can be supplied so that components such as organic substances absorbed in the absorption liquid can be oxidatively decomposed. However, when the odor gas contains oxygen, oxygen of the odor gas can be used. .

亜硝酸化工程で用いられる亜硝酸化手段は、吸収液中に吸収されたアンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、亜硝酸アンモニウムを生成させるように構成される。このような亜硝酸化手段としては、吸収液を亜硝酸化細菌と好気性下に接触させてアンモニア性窒素を亜硝酸化させるものが採用できる。亜硝酸化細菌は浮遊状態でもよく、またスポンジ、砂、活性炭等の担体に担持した状態でもよい。亜硝酸化手段には、亜硝酸化のための酸素を供給できるように構成される。 The nitritation means used in the nitritation step is to supply oxygen so that ammonia nitrogen is absorbed in the absorption solution by nitrifying bacteria so that ammonia nitrogen remains at 50 mg / L or more. produced so as not to be nitrous oxide, configured to generate a nitrite. As such nitritation means, a means for bringing the absorbent into contact with nitrite bacteria under aerobic condition to nitrite ammoniacal nitrogen can be employed. Nitrite bacteria may be in a floating state, or may be supported on a carrier such as sponge, sand, activated carbon or the like. The nitritation means is configured to supply oxygen for nitritation.

脱臭手段と亜硝酸化手段は、それぞれ別の手段として設け、脱臭工程と亜硝酸化工程を別々に行うことができる。この場合、脱臭手段で臭気成分を吸収した吸収液を亜硝酸化手段に送って、アンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化して亜硝酸アンモニウムを生成させるように構成される。ここでは脱臭手段と亜硝酸化手段間に吸収液の循環路を設けて、吸収液を循環させる。 The deodorizing means and the nitritation means are provided as separate means, and the deodorization step and the nitritation step can be performed separately. In this case, the absorption liquid that has absorbed the odor component by the deodorizing means is sent to the nitrifying means, and oxygen is supplied by the nitrifying bacteria so that ammonia nitrogen remains at 50 mg / L or more. It is configured to nitrite to produce ammonium nitrite so that nitric acid is not produced. Here it is provided a circulating passage of the absorbing liquid between the deodorizing means and the nitrous oxide unit, Ru to circulate the absorption liquid.

脱臭手段と亜硝酸化手段は、両者を同一の手段として設け、脱臭工程と亜硝酸化工程を同時に行うことができる。この場合、亜硝酸化細菌を含む吸収液を臭気ガスと接触させ、あるいは亜硝酸化細菌を担持した充填層に臭気ガスと吸収液を供給して接触させるように構成することができる。このようにして臭気ガスと吸収液と亜硝酸化細菌を接触させることにより、臭気成分を吸収液に吸収させて臭気ガスを脱臭すると同時に、アンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、脱臭工程と亜硝酸化工程を同時に行うことができる。亜硝酸化のための酸素は、臭気ガスに含まれる酸素を利用できる。 The deodorization means and the nitritation means are both provided as the same means, and the deodorization step and the nitritation step can be performed simultaneously. In this case, the absorbing liquid containing nitrifying bacteria can be brought into contact with the odor gas, or the odor gas and the absorbing liquid can be supplied and brought into contact with the packed bed carrying the nitrifying bacteria. By this way contact the absorption liquid and nitrite bacterium odorous gases, and at the same time the odor components is absorbed in the absorption liquid to deodorize the odor gas by the ammonia nitrogen nitrite bacterium, ammonium nitrogen Oxygen is supplied so as to remain at 50 mg / L or more, and nitritation is performed so that nitric acid is not generated , and the deodorization step and the nitritation step can be performed simultaneously. As oxygen for nitritation, oxygen contained in odor gas can be used.

脱窒工程で用いられる脱窒手段は、亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒するように構成される。アナモックス細菌は嫌気性であるため、酸素が供給されない構造の反応槽が用いられる。アナモックス細菌は、浮遊状の汚泥として用いてもよく、担体に担持した状態またはグラニュール等の粒状の状態で用いてもよい。このような脱窒手段において、アンモニア性窒素と亜硝酸性窒素を含む吸収液をアナモックス細菌と接触させ、アンモニア性窒素と亜硝酸性窒素とを反応させて窒素ガスに転換し、脱窒を行う。   The denitrification means used in the denitrification step is configured to denitrify the nitrite solution by reacting ammonia nitrogen and nitrite nitrogen with anammox bacteria. Since anammox bacteria are anaerobic, a reaction tank having a structure not supplied with oxygen is used. Anammox bacteria may be used as floating sludge, or may be used in a state of being supported on a carrier or in a granular state such as granules. In such denitrification means, the absorption liquid containing ammonia nitrogen and nitrite nitrogen is brought into contact with anammox bacteria, and ammonia nitrogen and nitrite nitrogen are reacted to convert them into nitrogen gas for denitrification. .

脱臭手段、亜硝酸化手段および脱窒手段間に循環路を設けることにより、循環路に吸収
液を循環し、脱臭工程において吸収液中に臭気成分を吸収させ、亜硝酸化工程において吸収液中のアンモニア性窒素を亜硝酸化し、脱窒工程において吸収液中のアンモニア性窒素と亜硝酸性窒素とを反応させて脱窒することができ、全工程を閉回路で処理することが可能となる。循環路中には吸収液の貯留槽を設けることができる。
By providing a circulation path between the deodorizing means, the nitrifying means and the denitrifying means, the absorbing liquid is circulated through the circulating path, the odor component is absorbed in the absorbing liquid in the deodorizing process, and the absorbing liquid is absorbed in the nitrifying process. The nitrogenous ammonia can be denitrified and denitrified by reacting ammonia nitrogen and nitrite nitrogen in the absorbent in the denitrification process, and the entire process can be processed in a closed circuit. . An absorption liquid storage tank can be provided in the circulation path.

亜硝酸化工程で用いられる亜硝酸化細菌は、従来よりアンモニア性窒素の亜硝酸化に用いられている細菌であって、好気性下にアンモニア性窒素を酸化して亜硝酸性窒素に転換する細菌である。このような亜硝酸化細菌は、アンモニア性窒素を含む吸収液を好気性下に酸化することにより発生させることができるが、有機性廃水処理の亜硝酸化工程より採取した汚泥をそのまま、または充填層に付着させて使用することができる。   Nitrite bacteria used in the nitritation process are bacteria that have been used for nitritation of ammonia nitrogen, and oxidize ammonia nitrogen under aerobic condition to convert it to nitrite nitrogen. It is a bacterium. Such nitrite bacteria can be generated by oxidizing absorptive liquid containing ammoniacal nitrogen under aerobic condition, but the sludge collected from the nitritation process of organic wastewater treatment is used as is or filled. It can be used attached to a layer.

脱窒工程で用いられるアナモックス細菌は、Planctomycetesに属す細菌であって、従来の脱窒に用いられた従属栄養性の脱窒細菌とは異なり、独立栄養性の細菌であるため、脱窒に際して従来の脱窒細菌には必要であったメタノール等の栄養源の添加を必要としない。またアナモックス細菌は、アンモニア性窒素と亜硝酸性窒素を反応させて直接窒素ガスに変換させるため、アンモニア性窒素と亜硝酸性窒素を同時に除去でき、しかも有害な廃棄物を生成しない。   The anammox bacterium used in the denitrification process is a bacterium belonging to Plantomycetes, and is different from the heterotrophic denitrification bacterium used in the conventional denitrification, and is an autotrophic bacterium. It does not require the addition of nutrients such as methanol, which was necessary for the denitrifying bacteria. In addition, the anammox bacterium reacts ammonia nitrogen and nitrite nitrogen and converts them directly into nitrogen gas, so that ammonia nitrogen and nitrite nitrogen can be removed at the same time, and no harmful waste is generated.

アナモックス細菌は、アンモニア性窒素を電子供与体、亜硝酸性窒素を電子受容体として、アンモニア性窒素と亜硝酸性窒素とを反応させて直接窒素ガスに変換させるため、酸素および硝酸性窒素は不要であり、酸素が存在すると、アナモックス細菌の脱窒活性は低下する。従って脱窒工程に供給する吸収液には酸素が実質的に含まれていないことが重要である。またアナモックス細菌は硝酸を資化できないため亜硝酸化工程において硝酸性窒素が実質的に生成しないのが好ましい。   Anammox bacteria use ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor, reacting ammonia nitrogen and nitrite nitrogen directly into nitrogen gas, so oxygen and nitrate nitrogen are not required In the presence of oxygen, the denitrification activity of anammox bacteria decreases. Therefore, it is important that the absorption liquid supplied to the denitrification process is substantially free of oxygen. In addition, since anammox bacteria cannot assimilate nitric acid, it is preferable that nitrate nitrogen is not substantially generated in the nitritation step.

なお、酸素については、貯留槽から脱窒槽へ吸収液を移送する間に吸収液に含まれる細菌によって消費されるので、脱窒槽入口で溶存酸素がなくなるような量を供給することができる。   Note that oxygen is consumed by bacteria contained in the absorption liquid during the transfer of the absorption liquid from the storage tank to the denitrification tank, so that it is possible to supply such an amount that dissolved oxygen disappears at the denitrification tank inlet.

またアナモックス細菌は、アンモニア性窒素と亜硝酸性窒素とをモル比で1:1.32で反応させるため、脱窒工程に供給する吸収液はアンモニア性窒素と亜硝酸性窒素のモル比が1:1.32付近で、硝酸性窒素を含まないものが好ましい。またアナモックス細菌により効率よく脱窒するためには、吸収液中のアンモニア性窒素濃度が50〜400mg/L、亜硝酸性窒素濃度が40〜300mg/Lであるのが望ましい。一方脱臭工程では、アンモニア濃度が低く、亜硝酸濃度が高く、pHが低いほど、アンモニア等の臭気成分の吸収効率が高い。また亜硝酸化工程において亜硝酸化細菌により、硝酸が生成しない状態で吸収液中のアンモニア性窒素を亜硝酸化して亜硝酸アンモニウムを生成させるためには、吸収液中のアンモニア性窒素濃度が50mg/L以上、亜硝酸性窒素濃度が40mg/L以上であるのが望ましい。   In addition, since anammox bacteria react ammonia nitrogen and nitrite nitrogen at a molar ratio of 1: 1.32, the absorption liquid supplied to the denitrification step has a molar ratio of ammonia nitrogen and nitrite nitrogen of 1. : Around 1.32 and preferably not containing nitrate nitrogen. In order to efficiently denitrify by anammox bacteria, it is desirable that the ammoniacal nitrogen concentration in the absorbent is 50 to 400 mg / L and the nitrite nitrogen concentration is 40 to 300 mg / L. On the other hand, in the deodorization process, the lower the ammonia concentration, the higher the nitrous acid concentration, and the lower the pH, the higher the absorption efficiency of odor components such as ammonia. In addition, in order to nitrite ammonia nitrogen in the absorbing solution without producing nitric acid by nitrifying bacteria in the nitrifying step, to produce ammonium nitrite, the concentration of ammoniacal nitrogen in the absorbing solution is 50 mg / It is desirable that the concentration of nitrite nitrogen is 40 mg / L or more.

このため脱臭工程、亜硝酸化工程及び脱窒工程に供給する吸収液は、アンモニア性窒素濃度が50〜400mg/L、好ましくは80〜300mg/L、さらに好ましくは100〜250mg/L、亜硝酸性窒素濃度が40〜300mg/L、好ましくは50〜250mg/L、さらに好ましくは80〜150mg/L、アンモニア性窒素:亜硝酸性窒素のモル比が1:0.8以下、好ましくは1:(0.5〜0.8)、pH6.5〜7.5、好ましくはpH6.7〜7.3とするFor this reason, the absorption liquid supplied to the deodorization process, the nitritation process and the denitrification process has an ammoniacal nitrogen concentration of 50 to 400 mg / L, preferably 80 to 300 mg / L, more preferably 100 to 250 mg / L, and nitrous acid. The nitrogen concentration is 40 to 300 mg / L, preferably 50 to 250 mg / L, more preferably 80 to 150 mg / L, and the molar ratio of ammonia nitrogen to nitrite nitrogen is 1: 0.8 or less, preferably 1: (0.5 to 0.8), pH 6.5 to 7.5, preferably pH 6.7 to 7.3.

脱臭工程と亜硝酸化工程を同一の工程として行う場合も上記と同様である。   The same applies to the case where the deodorization step and the nitritation step are performed as the same step.

脱臭の対象となる臭気ガス中には、臭気成分としてアンモニアが通常50〜160ppm含まれており、処理ガス中のアンモニア濃度は0〜0.5ppmとすることが要求される。この程度のアンモニアの除去量で上記アンモニア性窒素濃度および亜硝酸性窒素濃度とするために、前記の高アンモニア性窒素濃度および高亜硝酸性窒素濃度の吸収液を脱臭工程、亜硝酸化工程および脱窒工程間で循環する。 The odor gas to be deodorized usually contains 50 to 160 ppm of ammonia as an odor component, and the ammonia concentration in the processing gas is required to be 0 to 0.5 ppm. For the above ammonium nitrogen concentration and nitrite nitrogen concentration in removal amount of ammonia in this degree, deodorization step the absorption solution having a high ammonium nitrogen concentration and KoA nitrate nitrogen concentration of the nitrite step and It circulates between the denitrification process.

吸収液を脱臭工程、亜硝酸化工程および脱窒工程間で循環する場合、脱臭工程、亜硝酸化工程間、および亜硝酸化工程、脱窒工程間で循環量を変えることができる。貯留槽を設ける場合、貯留槽から脱臭工程および亜硝酸化工程への循環量と、貯留槽から脱窒工程への循環量を変えることができる。貯留槽を設ける場合でも、亜硝酸化工程から脱窒工程へ亜硝酸化液を送ってもよく、また脱窒工程から脱臭工程または亜硝酸化工程へ脱窒液を送ってもよい。ここで脱臭工程および亜硝酸化工程は同一の工程とすることができる。吸収液の循環量は各工程の処理に必要な滞留時間から決定される。   When the absorption liquid is circulated between the deodorization process, the nitritation process, and the denitrification process, the circulation amount can be changed between the deodorization process, the nitritation process, and the nitritation process and the denitrification process. When providing a storage tank, the amount of circulation from the storage tank to the deodorization step and the nitritation step and the amount of circulation from the storage tank to the denitrification step can be changed. Even when a storage tank is provided, the nitrite solution may be sent from the nitritation step to the denitrification step, and the denitrification solution may be sent from the denitrification step to the deodorization step or nitritation step. Here, the deodorization step and the nitritation step can be the same step. The circulation amount of the absorbing liquid is determined from the residence time necessary for the processing in each step.

脱臭工程、亜硝酸化工程および脱窒工程における処理温度は室温以上でよく、特に30℃以上が望ましく、低温時には加温してもよい。pH調整剤、栄養剤、その他の添加剤は必要に応じて注入する。吸収液は循環使用されるが、非分解性成分が濃縮される場合には、一部を引き抜いて廃棄することができる。各工程で汚泥が過剰に生成する場合には、同様に一部を引き抜いて廃棄することができる。   The treatment temperature in the deodorization step, nitritation step and denitrification step may be room temperature or higher, particularly 30 ° C. or higher, and may be heated at low temperatures. pH adjusters, nutrients, and other additives are injected as needed. The absorption liquid is circulated, but when the non-degradable component is concentrated, a part of it can be withdrawn and discarded. When sludge is excessively generated in each step, it can be similarly extracted and discarded.

本発明の脱臭方法および装置では、脱臭工程において臭気ガスを吸収液と接触させ、臭気ガス中のアンモニア、アミン等の臭気成分を吸収液に吸収させて脱臭する。このときアンモニア、アミン類は水に溶けやすいため、ガス/水の接触で水側に移行して除去され、臭気ガスは脱臭される。吸収液中に亜硝酸性窒素が存在すると、中和反応によりアンモニア、アミン等の吸収が行われ、吸収効率は高い。   In the deodorization method and apparatus of the present invention, in the deodorization step, the odor gas is brought into contact with the absorption liquid, and the odor components such as ammonia and amine in the odor gas are absorbed into the absorption liquid for deodorization. At this time, since ammonia and amines are easily dissolved in water, they move to the water side by gas / water contact and are removed, and the odor gas is deodorized. When nitrite nitrogen is present in the absorbent, ammonia, amine, etc. are absorbed by the neutralization reaction, and the absorption efficiency is high.

亜硝酸化工程では、吸収液中のアンモニア性窒素が亜硝酸化細菌により、硝酸が生成しない条件下に亜硝酸化され、亜硝酸アンモニウムが生成する。このとき水酸化ナトリウムなどのpH調整剤を添加しなければ、吸収液のアンモニア性窒素:亜硝酸性窒素のモル比がほぼ1:1.32となるように反応が行われる。また吸収液を前記のアンモニア性窒素濃度および亜硝酸性窒素濃度とすることにより、硝酸性窒素は実質的に生成せず、アンモニア性窒素と亜硝酸性窒素のモル比は前記比となるように反応が行われる。   In the nitritation step, ammonia nitrogen in the absorbent is nitritized by nitrite bacteria under conditions where nitric acid is not produced, thereby producing ammonium nitrite. At this time, if a pH adjusting agent such as sodium hydroxide is not added, the reaction is carried out so that the molar ratio of ammonia nitrogen to nitrite nitrogen in the absorbent is approximately 1: 1.32. In addition, by setting the absorption liquid to the ammonia nitrogen concentration and nitrite nitrogen concentration, nitrate nitrogen is not substantially generated, and the molar ratio of ammonia nitrogen to nitrite nitrogen is the above ratio. Reaction takes place.

脱臭工程と亜硝酸化工程を同一の工程とする場合は、吸収されたアンモニア性窒素が直ちに亜硝酸化されてpHが低下するため、脱臭工程におけるアンモニア等の吸収効率が高くなり、またアンモニア性窒素が亜硝酸化されると直ちにアンモニアが補給されてアンモニア性窒素濃度が高くなるため、亜硝酸化効率が高くなる。   When the deodorization step and the nitritation step are the same step, the absorbed ammonia nitrogen is immediately nitrified and the pH is lowered, so that the absorption efficiency of ammonia and the like in the deodorization step is increased, and the ammonia type Immediately after nitrogen is nitrified, ammonia is replenished to increase the concentration of ammoniacal nitrogen, thus increasing nitritation efficiency.

脱窒工程では、アナモックス細菌により亜硝酸化液中のアンモニア性窒素と亜硝酸性窒素とが反応して窒素ガスに変換され、脱窒される。この時、溶存酸素の存在はアナモックス細菌の活性を低下させるため流入しないことが望まれる。このため脱窒工程の流量は、他の流量に比べて小さくして亜硝酸化細菌による脱酸素を十分行わせる必要がある。これにより臭気成分は無害な成分に変換され、臭気ガスが効率よく脱臭される。アナモックス細菌による反応は以下に示され、アンモニア性窒素と亜硝酸性窒素がほぼ1:1.32で反応する。   In the denitrification step, anammox bacteria react ammonia nitrogen and nitrite nitrogen in the nitrite to convert them into nitrogen gas, which is denitrified. At this time, it is desirable that the presence of dissolved oxygen does not flow because the activity of anammox bacteria is reduced. For this reason, the flow rate of the denitrification step needs to be made smaller than other flow rates to sufficiently perform deoxygenation by nitrifying bacteria. Thereby, the odor component is converted into a harmless component, and the odor gas is efficiently deodorized. The reaction by anammox bacteria is shown below, with ammonia nitrogen and nitrite nitrogen reacting at approximately 1: 1.32.

1NH4 ++1.32NO2 -+0.066HCO3+0.13H → 1.02N2+0.26NO3 -+0.066CH20.50.15+2.03H2O ・・・(1)
上記の処理では、高アンモニア性窒素濃度および高亜硝酸性窒素濃度の吸収液を脱臭工程、亜硝酸化工程および脱窒工程間で循環することにより、亜硝酸化工程において硝酸が生成しない条件でアンモニア性窒素を亜硝酸化することができ、脱窒工程において無酸素下で高効率で脱窒を行うことができる。脱窒処理液は循環使用されるためアンモニア性窒素および高亜硝酸性窒素が含まれていてもよく、窒素含有排水が排出されることはない。
1NH 4 + + 1.32NO 2 + 0.066HCO 3 + 0.13H → 1.02N 2 + 0.26NO 3 + 0.066CH 2 O 0.5 N 0.15 + 2.03H 2 O (1)
In the above-mentioned treatment, an absorbing solution having a high ammonia nitrogen concentration and a high nitrite nitrogen concentration is circulated between the deodorization step, the nitritation step and the denitrification step, so that nitric acid is not generated in the nitritation step. Ammonia nitrogen can be nitritized, and denitrification can be performed with high efficiency in the denitrification step without oxygen. Since the denitrification solution is circulated, it may contain ammonia nitrogen and high nitrite nitrogen, and no nitrogen-containing wastewater is discharged.

吸収液が高アンモニア性窒素濃度の場合、アンモニア性窒素の吸収効率は低くなるが、高亜硝酸性窒素濃度とすることによりアンモニア性窒素の吸収効率を高くすることができ、また脱臭工程と亜硝酸化工程を同一の工程とすることにより、アンモニア性窒素の吸収と亜硝酸化を並行して行って吸収効率と亜硝酸化効率を高くすることができる。   When the absorption liquid has a high ammonia nitrogen concentration, the absorption efficiency of ammonia nitrogen is low. However, by using a high nitrite nitrogen concentration, the absorption efficiency of ammonia nitrogen can be increased. By making the nitrating step the same, absorption of ammoniacal nitrogen and nitritation can be performed in parallel to increase absorption efficiency and nitritation efficiency.

亜硝酸化工程では、アンモニア性窒素:亜硝酸性窒素のモル比が近似的に1:1.32の亜硝酸化液を生成させればよい。このことは吸収液中のアンモニア性窒素の全部ではなく約1/2を亜硝酸性窒素に酸化すればよいことを示している。またアンモニア性窒素を亜硝酸性窒素まで酸化すればよく、従来のように亜硝酸性窒素から硝酸性窒素に酸化する必要はないので、硝化細菌を含む汚泥は不要であり、硝化菌担持の充填材が省略でき、装置が小さくなるとともに、酸化に必要な酸素の量も少なくなる。   In the nitritation step, a nitrite having an ammonia nitrogen: nitrite nitrogen molar ratio of approximately 1: 1.32 may be generated. This indicates that about half of the ammoniacal nitrogen in the absorbent should be oxidized to nitrite nitrogen. Also, it is only necessary to oxidize ammonia nitrogen to nitrite nitrogen, and there is no need to oxidize nitrite nitrogen to nitrate nitrogen as in the past, so sludge containing nitrifying bacteria is unnecessary, and filling with nitrifying bacteria supported The material can be omitted, the device becomes smaller, and the amount of oxygen required for oxidation is also reduced.

脱窒工程、アンモニア性窒素と亜硝酸性窒素とをほぼ1:1.32のモル比で反応させて脱窒するため、メタノール等の栄養源が不要であり、効率よく脱窒を行うことができる。また脱窒反応により生成するのは無害な窒素ガスであり、そのまま廃棄できる。亜硝酸化液細菌およびアナモックス細菌は増殖速度が小さいので、汚泥の増加量は少なく、余剰汚泥の発生量は少ない。   In the denitrification process, ammonia nitrogen and nitrite nitrogen are reacted at a molar ratio of approximately 1: 1.32 for denitrification, so no nutrient source such as methanol is required, and denitrification can be performed efficiently. it can. Moreover, it is harmless nitrogen gas produced | generated by denitrification reaction, and can be discarded as it is. Since nitrite bacteria and anammox bacteria have a low growth rate, the amount of sludge increase is small, and the amount of surplus sludge generated is small.

本発明によれば、臭気ガスを吸収液と接触させて脱臭し、吸収液中のアンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する際、脱臭工程、亜硝酸化工程及び脱窒工程に供給する吸収液をアンモニア性窒素濃度50〜400mg/L、亜硝酸性窒素濃度40〜300mg/L、pH6.5〜7.5であり、吸収液を脱臭工程、亜硝酸化工程および脱窒工程間で循環するようにしたので、簡単な装置と操作により、栄養や中和剤などを添加する必要がなく、少ない動力費でアンモニア、アミン類等の臭気成分を含有する臭気ガスから臭気成分を、安全かつ効率よく除去することができ、発生する汚泥その他の廃棄物量も少ない。 According to the present invention, the odor gas is brought into contact with the absorbing liquid to deodorize, and the nitrogenous ammonia in the absorbing liquid is supplied by nitrite bacteria so that oxygenous nitrogen remains at 50 mg / L or more, Nitrite to prevent formation of nitric acid, and supply nitrous acid solution to deodorization process, nitritation process and denitrification process when denitrifying by reacting ammonia nitrogen and nitrite nitrogen with anammox bacteria The absorption liquid is ammonia nitrogen concentration 50 to 400 mg / L, nitrite nitrogen concentration 40 to 300 mg / L, pH 6.5 to 7.5, and the absorption liquid is deodorized step, nitritation step and denitrification step Since it is made to circulate, it is not necessary to add nutrients and neutralizing agents, etc. with simple equipment and operation, and odor components from odor gas containing odor components such as ammonia, amines, etc. with low power cost, Cheap And can be efficiently removed, sludge generated other waste is small.

以下、本発明の実施の形態を図面により説明する。図1は実施形態の脱臭装置を示すフロー図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing a deodorizing apparatus according to an embodiment.

図1において、1は脱臭・亜硝酸化槽であり、内部に亜硝酸化細菌を担持した活性炭からなる充填材層2が設けられており、その下部に散気装置3が設けられて、臭気ガス供給用のラインL1が連絡している。充填材層2の上部に散液装置4が設けられていて、貯留槽5から吸収液用のラインL3が連絡している。脱臭・亜硝酸化槽1の下部からラインL2が貯留槽5に連絡し、上部からラインL4が系外に連絡している。6は脱窒槽であり、内部にアナモックス細菌のグラニュールからなる充填材層7が設けられている。脱窒槽6の下部にはラインL5、6が連絡し、上部にはラインL7、8が連絡している。P1、P2はポンプである。   In FIG. 1, reference numeral 1 denotes a deodorization / nitritation tank, in which a filler layer 2 made of activated carbon carrying nitrite bacteria is provided, and an air diffuser 3 is provided below the filler layer 2 to provide odor. A gas supply line L1 is in communication. A spraying device 4 is provided above the filler layer 2, and a line L 3 for absorbing liquid communicates from the storage tank 5. The line L2 communicates with the storage tank 5 from the lower part of the deodorization / nitritation tank 1, and the line L4 communicates outside the system from the upper part. Reference numeral 6 denotes a denitrification tank, in which a filler layer 7 made of granules of anammox bacteria is provided. Lines L5 and L6 communicate with the lower part of the denitrification tank 6, and lines L7 and L8 communicate with the upper part. P1 and P2 are pumps.

上記の脱臭装置による脱臭方法は、ラインL1から脱臭・亜硝酸化槽1に臭気ガスを供給して散気装置3から散気し、ポンプP1によりラインL2、L3を通して貯留槽5から吸収液8を脱臭・亜硝酸化槽1に循環し、散液装置4から散液する。これにより臭気ガスは充填材層2を通る間に吸収液と接触し、アンモニア、アミン類等の臭気成分は吸収液に吸収される。このときアンモニア性窒素を50mg/L以上残留させるような酸素に供給することにより、吸収されたアンモニア性窒素は充填材層2の亜硝酸化細菌により亜硝酸化され、亜硝酸アンモニウムが生成する。吸収された他の有機成分はここで酸化される。臭気成分を除去された処理ガスはラインL4から系外に排出される。臭気成分を吸収し、亜硝酸化された吸収液はラインL2から貯留槽5に循環する。 The deodorizing method using the above deodorizing apparatus supplies odorous gas from the line L1 to the deodorizing / nitritating tank 1 and diffuses the air from the diffuser 3, and the absorbent 8 from the storage tank 5 through the lines L2 and L3 by the pump P1. Is circulated to the deodorization / nitritation tank 1 and sprayed from the spraying device 4. As a result, the odor gas comes into contact with the absorbing solution while passing through the filler layer 2, and odor components such as ammonia and amines are absorbed by the absorbing solution. At this time, by supplying oxygen that leaves ammonia nitrogen at 50 mg / L or more, the absorbed ammonia nitrogen is nitrified by the nitrifying bacteria in the filler layer 2 to produce ammonium nitrite. Other organic components absorbed are oxidized here. The processing gas from which the odor component is removed is discharged out of the system from the line L4. Absorbing liquid that absorbs odorous components and is nitrified is circulated from the line L2 to the storage tank 5.

貯留槽5の吸収液8の一部はポンプP2によりラインL5から脱窒槽6の下部に導入され、充填材層7を上向流で流れる間にアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とが反応して窒素ガスに転換し脱窒が行われる。脱窒処理液はラインLから貯留槽5に循環し、貯留槽5内の吸収液8と混合されるが、ラインL9から脱臭・亜硝酸化槽1に循環してもよい。脱窒処理で生成する窒素ガスはラインL8から系外に排出される。充填材層7から余剰汚泥が発生する場合にはラインL6から系外に排出される。 A part of the absorption liquid 8 in the storage tank 5 is introduced into the lower part of the denitrification tank 6 from the line L5 by the pump P2, and ammonia nitrogen and nitrite nitrogen are caused by anammox bacteria while flowing upward in the filler layer 7. Reacts with nitrogen gas to convert to nitrogen gas and denitrification. Denitrified liquid is circulated from the line L 7 into the storage tank 5, but is mixed with the absorption liquid 8 in the storage tank 5 may be recycled to the deodorizing and nitritation tank 1 from the line L9. Nitrogen gas generated by the denitrification process is discharged out of the system from the line L8. When excess sludge is generated from the filler layer 7, it is discharged out of the system from the line L6.

ラインL3から脱臭・亜硝酸化槽1に供給する吸収液は、アンモニア性窒素濃度が50
〜400mg/L、好ましくは80〜300mg/L、さらに好ましくは100〜250mg/L、亜硝酸性窒素濃度が40〜300mg/L、好ましくは50〜250mg/L、さらに好ましくは80〜150mg/L、pH6.5〜7.5、好ましくはpH6.7〜7.3とする。アンモニア性窒素:亜硝酸性窒素のモル比は1:0.8以下、好ましくは1:(0.5〜0.8)とするのが好ましい。
The absorption liquid supplied from the line L3 to the deodorization / nitritation tank 1 has an ammoniacal nitrogen concentration of 50.
-400 mg / L, preferably 80-300 mg / L, more preferably 100-250 mg / L, nitrite nitrogen concentration 40-300 mg / L, preferably 50-250 mg / L, more preferably 80-150 mg / L , p H6.5~7.5, preferably with pH6.7~7.3. The molar ratio of ammonia nitrogen to nitrite nitrogen is 1: 0.8 or less, preferably 1: (0.5 to 0.8) .

ラインL2から貯留槽5に循環する亜硝酸化液は、アンモニア性窒素濃度が50〜400mg/L、好ましくは80〜300mg/L、さらに好ましくは100〜250mg/L、亜硝酸性窒素濃度が40〜300mg/L、好ましくは50〜250mg/L、さらに好ましくは80〜150mg/L、pH6.5〜7.5、好ましくはpH6.7〜7.3とする。アンモニア性窒素:亜硝酸性窒素のモル比は1:0.8以下、好ましくは1:(0.5〜0.8)とするのが好ましい。 The nitrite solution circulating from the line L2 to the storage tank 5 has an ammoniacal nitrogen concentration of 50 to 400 mg / L, preferably 80 to 300 mg / L, more preferably 100 to 250 mg / L, and a nitrite nitrogen concentration of 40. -300 mg / L, preferably 50-250 mg / L, more preferably 80-150 mg / L , pH 6.5-7.5, preferably pH 6.7-7.3 . The molar ratio of ammonia nitrogen to nitrite nitrogen is 1: 0.8 or less, preferably 1: (0.5 to 0.8) .

一方、ラインL5から脱窒槽6に供給する吸収液は、アンモニア性窒素濃度が50〜400mg/L、好ましくは80〜300mg/L、さらに好ましくは100〜250mg/L、亜硝酸性窒素濃度が40〜300mg/L、好ましくは50〜250mg/L、さらに好ましくは80〜150mg/L、pH6.5〜7.5、好ましくはpH6.7〜7.3とする。アンモニア性窒素:亜硝酸性窒素のモル比1:0.8以下、好ましくは1:(0.5〜0.8)の割合で含のが好ましい。 On the other hand, the absorption liquid supplied from the line L5 to the denitrification tank 6 has an ammoniacal nitrogen concentration of 50 to 400 mg / L, preferably 80 to 300 mg / L, more preferably 100 to 250 mg / L, and a nitrite nitrogen concentration of 40. -300 mg / L, preferably 50-250 mg / L, more preferably 80-150 mg / L, pH 6.5-7.5, preferably pH 6.7-7.3 . Ammonia nitrogen molar ratio of nitrite nitrogen is 1: 0.8, preferably 1: including is preferably at a ratio of (0.5 to 0.8).

ラインL7から貯留槽5に循環する脱窒処理液は、アンモニア性窒素濃度、亜硝酸性窒素濃度、及びアンモニア性窒素:亜硝酸性窒素のモル比などには制限がなく、pH6.5〜7.5、好ましくはpH6.7〜7.3とするのが好ましい。   The denitrification treatment liquid circulated from the line L7 to the storage tank 5 is not limited in the ammonia nitrogen concentration, the nitrite nitrogen concentration, and the ammonia nitrogen: nitrite nitrogen molar ratio, and the pH is 6.5 to 7 0.5, preferably pH 6.7 to 7.3.

なお、アナモックス細菌の活性を保つため溶存酸素を少なくする必要があり、ラインL7の流量は他のラインの1/10以下であるのが望ましい。   In order to maintain the activity of the anammox bacteria, it is necessary to reduce the dissolved oxygen, and the flow rate of the line L7 is desirably 1/10 or less of the other lines.

以下、本発明の実施例について説明する。
実施例1:
図1の脱臭・亜硝酸化槽1において、充填材層2として亜硝酸化細菌を担持した活性炭50Lを充填した充填層を用い、保有水量100Lで、循環方式で散水し臭気ガスの脱臭を行った。臭気ガスは堆肥化設備から排出される排ガス(アンモニア:60ppm、炭酸ガス:1000〜1002ppm、N2O:4.2〜4.3ppm、硫化水素:0.003〜0.004ppm、VOC:70〜71ppm)を、ブロアーポンプで引き込み、充填層を通過させ充填塔上部から排気した。ガス流量は0.4m3/minとした。
Examples of the present invention will be described below.
Example 1:
In the deodorization and nitritation tank 1 of FIG. 1, using a packed bed filled with 50 L of activated carbon supporting nitrite bacteria as the filler layer 2, the odorous gas is deodorized by sprinkling water in a circulating manner with a retained water volume of 100 L. It was. Odor gas is exhaust gas discharged from composting equipment (ammonia: 60 ppm, carbon dioxide gas: 1000-1002 ppm, N 2 O: 4.2-4.3 ppm, hydrogen sulfide: 0.003-0.004 ppm, VOC: 70- 71 ppm) was drawn with a blower pump, passed through the packed bed, and exhausted from the top of the packed tower. The gas flow rate was 0.4 m 3 / min.

貯留槽5には、アンモニア性窒素濃度100mg/L、亜硝酸性窒素濃度75mg/L、pH7.5の吸収液を入れ、脱臭・亜硝酸化槽1に140L/hrで循環して脱臭・亜硝酸化を行い、脱窒槽6に0.6L/hrで循環して脱窒を行った。脱窒槽6はアナモックス細菌を含むグラニュールを10L充填し、上向流で吸収液を流して流動床方式で脱窒を行った。   The storage tank 5 is filled with an absorbing solution having an ammonia nitrogen concentration of 100 mg / L, a nitrite nitrogen concentration of 75 mg / L, and a pH of 7.5, and is circulated through the deodorization / nitritation tank 1 at 140 L / hr to remove the deodorization / sublimation. Nitrification was performed, and denitrification was performed by circulating in the denitrification tank 6 at 0.6 L / hr. The denitrification tank 6 was filled with 10 L of granules containing anammox bacteria, and denitrification was carried out in a fluidized bed system by flowing the absorbent in an upward flow.

脱臭・亜硝酸化槽1から得られた処理ガスは、アンモニア:0.2〜0.3ppm、炭酸ガス:8800〜8810ppm、N2O:3.2〜3.3ppm、硫化水素:0.001〜0.002ppm、VOC:60〜62ppmであった。脱臭・亜硝酸化槽1から得られた吸収液は、アンモニア性窒素濃度108〜112mg/L、亜硝酸性窒素濃度83〜87mg/L、pH7.2〜7.5であり、脱窒槽6から得られた吸収液は、アンモニア性窒素濃度12〜18mg/L、亜硝酸性窒素濃度1〜3mg/L、pH7.2〜7.5であった。貯留槽8の吸収液は、アンモニア性窒素濃度108〜112mg/L、亜硝酸性窒素濃度83〜87mg/L、pH7.2〜7.5に維持された。 The treatment gases obtained from the deodorization / nitritation tank 1 were ammonia: 0.2-0.3 ppm, carbon dioxide: 8800-8810 ppm, N 2 O: 3.2-3.3 ppm, hydrogen sulfide: 0.001 It was -0.002 ppm and VOC: 60-62 ppm. The absorption liquid obtained from the deodorization / nitritation tank 1 has an ammonia nitrogen concentration of 108 to 112 mg / L, a nitrite nitrogen concentration of 83 to 87 mg / L, and a pH of 7.2 to 7.5. The obtained absorption liquid was ammonia nitrogen concentration 12-18 mg / L, nitrite nitrogen concentration 1-3 mg / L, pH 7.2-7.5. The absorption liquid in the storage tank 8 was maintained at an ammoniacal nitrogen concentration of 108 to 112 mg / L, a nitrite nitrogen concentration of 83 to 87 mg / L, and a pH of 7.2 to 7.5.

比較例1:
図1の脱臭・亜硝酸化槽1に相当する脱臭・硝酸化において、充填層として亜硝酸化細菌および硝酸化細菌を担持した活性炭50Lを充填した充填層を用い、保有水量100Lで、循環方式で散水し臭気ガスの脱臭を行った。臭気ガスは実施例1と同じガスを、同じ流量で用いた。
Comparative Example 1:
In the deodorization / nitrification corresponding to the deodorization / nitritation tank 1 of FIG. 1, a packed bed filled with 50 L of activated carbon carrying nitrite bacteria and nitrifying bacteria is used as the packed bed, and the circulating system is used with a retained water volume of 100 L The odor gas was deodorized by spraying water. The same gas as in Example 1 was used as the odor gas at the same flow rate.

貯留槽には、アンモニア性窒素濃度100mg/L、亜硝酸性窒素濃度75mg/L、硝酸性窒素濃度100mg/L、pH7.5の吸収液を入れ、脱臭・硝酸化槽に140L/hrで循環して脱臭・硝酸化を行い、脱窒槽に6L/hrで循環して脱窒を行った。脱窒槽は従属栄養細菌である脱窒細菌を含むグラニュールを10L充填し、上向流で吸収液を流して流動床方式で脱窒を行った。脱窒のための水素供与体として、70%メタノールが約80mL/dを供給した。   The storage tank is filled with an absorbing solution of ammonia nitrogen concentration 100 mg / L, nitrite nitrogen concentration 75 mg / L, nitrate nitrogen concentration 100 mg / L, pH 7.5, and circulated in the deodorization / nitrification tank at 140 L / hr. Then, deodorization and nitrification were performed, and denitrification was performed by circulating in a denitrification tank at 6 L / hr. The denitrification tank was filled with 10 L of granules containing denitrifying bacteria, which are heterotrophic bacteria, and denitrified in a fluidized bed system by flowing the absorbent in an upward flow. About 80 mL / d of 70% methanol was supplied as a hydrogen donor for denitrification.

脱臭・硝酸化槽から得られた処理ガスは、アンモニア:0.2〜0.3ppm、炭酸ガス:8800〜8810ppm、N2O:3.2〜3.3ppm、硫化水素:0.001〜0.002ppm、VOC:60〜62ppmであった。脱臭・硝酸化槽から得られた吸収液は、アンモニア性窒素濃度108〜112mg/L、亜硝酸性窒素濃度83〜87mg/L、硝酸性窒素濃度108〜112mg/L、pH7.2〜7.5であり、脱窒槽から得られた吸収液は、亜硝酸性窒素濃度1〜8mg/L、硝酸性窒素濃度2〜10mg/L、pH7.2〜7.5であった。貯留槽の吸収液は、アンモニア性窒素濃度108〜112mg/L、亜硝酸性窒素濃度83〜87mg/L、硝酸性窒素濃度108〜112mg/L、pH7.2〜7.5に維持された。
脱窒のための水素供与体として、70%メタノールが約80ml/日消費され、汚泥が12ml生成した。
The treatment gas obtained from the deodorization / nitrification tank was ammonia: 0.2-0.3 ppm, carbon dioxide: 8800-8810 ppm, N 2 O: 3.2-3.3 ppm, hydrogen sulfide: 0.001-0 0.002 ppm, VOC: 60-62 ppm. The absorbent obtained from the deodorization / nitrification tank has an ammoniacal nitrogen concentration of 108 to 112 mg / L, a nitrite nitrogen concentration of 83 to 87 mg / L, a nitrate nitrogen concentration of 108 to 112 mg / L, and a pH of 7.2 to 7. The absorption liquid obtained from the denitrification tank had a nitrite nitrogen concentration of 1 to 8 mg / L, a nitrate nitrogen concentration of 2 to 10 mg / L, and a pH of 7.2 to 7.5. The absorption liquid in the storage tank was maintained at an ammoniacal nitrogen concentration of 108 to 112 mg / L, a nitrite nitrogen concentration of 83 to 87 mg / L, a nitrate nitrogen concentration of 108 to 112 mg / L, and a pH of 7.2 to 7.5.
As a hydrogen donor for denitrification, about 80 ml / day of 70% methanol was consumed and 12 ml of sludge was produced.

比較例2:
図1の脱臭・亜硝酸化槽1に相当する充填槽式の脱臭槽を用い、充填層として亜硝酸化細菌および硝酸化細菌を担持した充填層を用い、脱窒槽6および貯留槽5を用いることなく、臭気ガスの脱臭を行った。脱臭槽内に木炭系担体を50L充填し充填層とした。散水は循環方式で、保有水量は100Lである。
ガスは堆肥化設備から排出される実排ガスをブロアーポンプで引き込み、担体上段から供給し、充填塔上部から排気した。ガス流量は0.2m3/minとした。
Comparative Example 2:
A filling tank type deodorization tank corresponding to the deodorization / nitritation tank 1 of FIG. 1 is used, a packed bed carrying nitrite bacteria and nitrate bacteria is used as the packed bed, and a denitrification tank 6 and a storage tank 5 are used. The odor gas was deodorized without any problems. The deodorization tank was filled with 50 L of charcoal carrier to form a packed bed. Watering is a circulation system, and the amount of water held is 100L.
The actual exhaust gas discharged from the composting equipment was drawn in with a blower pump, supplied from the upper stage of the carrier, and exhausted from the top of the packed tower. The gas flow rate was 0.2 m 3 / min.

運転にともない循環水中にアンモニア性窒素、亜硝酸性窒素および硝酸性窒素が蓄積する。これらの塩類濃度が高すぎると硝化細菌の活性が低下するため、塩類濃度の和が2500mg−N/L程度になるように給排水を実施した。すなわちアンモニア性窒素、亜硝酸性窒素および硝酸性窒素を高濃度で含む(2500mg−N/L)液が平均で約8L/日排出された。   Ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen accumulate in the circulating water during operation. Since the activity of nitrifying bacteria decreases when these salt concentrations are too high, water supply / drainage was carried out so that the sum of the salt concentrations was about 2500 mg-N / L. That is, a liquid (2500 mg-N / L) containing ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in high concentrations was discharged on average at about 8 L / day.

実施例2:
亜硝酸化細菌、硝酸化細菌の両者を含む硝化槽汚泥1000mg/Lで、アンモニア性窒素濃度400mg/L、亜硝酸性窒素濃度50mg/Lのアンモニア水を硝化した結果を表1に示す。表1より、アンモニア性窒素50mg/L以上残留させた場合に硝酸性窒素の発生が非常に少なくなることが分かる。
Example 2:
Table 1 shows the results of nitrification of ammonia water having an ammoniacal nitrogen concentration of 400 mg / L and a nitrite nitrogen concentration of 50 mg / L in a nitrification tank sludge containing both nitrite bacteria and nitrite bacteria. From Table 1, ammonium nitrogen when was 50 mg / L or more on residual, it is understood that the generation of nitrate nitrogen becomes very small.

Figure 0005008249
Figure 0005008249

実施形態の脱臭装置を示すフロー図である。It is a flowchart which shows the deodorizing apparatus of embodiment.

符号の説明Explanation of symbols

1 脱臭・亜硝酸化槽
2、7 充填材層
3 散気装置
4 散液装置
5 貯留槽
6 脱窒槽
8 吸収液
DESCRIPTION OF SYMBOLS 1 Deodorization and nitritation tank 2, 7 Filling material layer 3 Air diffuser 4 Liquid sprayer 5 Storage tank 6 Denitrification tank 8 Absorption liquid

Claims (5)

臭気ガスを吸収液と接触させて脱臭する脱臭工程と、
吸収液中のアンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、亜硝酸アンモニウムを生成させる亜硝酸化工程と、
亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する脱窒工程とを含み、
脱臭工程、亜硝酸化工程及び脱窒工程に供給する吸収液をアンモニア性窒素濃度50〜400mg/L、亜硝酸性窒素濃度40〜300mg/L、pH6.5〜7.5とし、
吸収液を脱臭工程、亜硝酸化工程および脱窒工程間で循環する脱臭方法。
A deodorizing step of deodorizing the odor gas by contacting the absorbing liquid;
Nitrite that produces ammonium nitrite by supplying oxygen so that ammonia nitrogen remains in the absorption liquid by nitrifying bacteria, leaving ammonia nitrogen to remain at 50 mg / L or more, and nitrifying so that nitric acid is not generated. Process,
The anammox bacteria nitritation solution, viewed contains a denitrification step of denitrification by reacting ammonia nitrogen and nitrite nitrogen,
The absorbent supplied to the deodorizing step, nitrifying step and denitrifying step is ammonia nitrogen concentration 50 to 400 mg / L, nitrite nitrogen concentration 40 to 300 mg / L, pH 6.5 to 7.5,
A deodorization method in which an absorbing solution is circulated between a deodorization step, a nitritation step and a denitrification step .
脱臭工程と亜硝酸化工程を同時に、または別々に行う請求項1記載の方法。     The method of Claim 1 which performs a deodorizing process and a nitritation process simultaneously or separately. 臭気ガスを吸収液と接触させて脱臭する脱臭手段と、
吸収液中のアンモニア性窒素を亜硝酸化細菌により、アンモニア性窒素を50mg/L以上残留させるように酸素を供給して、硝酸が生成しないように亜硝酸化し、亜硝酸アンモニウムを生成させる亜硝酸化手段と、
亜硝酸化液をアナモックス細菌により、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する脱窒手段と、
脱臭手段、亜硝酸化手段および脱窒手段間で吸収液を循環する循環路とを含み、
脱臭手段、亜硝酸化手段及び脱窒手段に供給する吸収液がアンモニア性窒素濃度50〜400mg/L、亜硝酸性窒素濃度40〜300mg/L、pH6.5〜7.5である脱臭装置。
Deodorizing means for deodorizing the odor gas by contacting the absorbing liquid;
Nitrite that produces ammonium nitrite by supplying oxygen so that ammonia nitrogen remains in the absorption liquid by nitrifying bacteria, leaving ammonia nitrogen to remain at 50 mg / L or more, and nitrifying so that nitric acid is not generated. Means,
A denitrification means for denitrifying the nitrite by reacting ammonia nitrogen and nitrite nitrogen with anammox bacteria ,
A circuit for circulating the absorbent between the deodorizing means, the nitrifying means and the denitrifying means,
A deodorizing apparatus in which the absorbing liquid supplied to the deodorizing means, the nitrifying means, and the denitrifying means is an ammonia nitrogen concentration of 50 to 400 mg / L, a nitrite nitrogen concentration of 40 to 300 mg / L, and a pH of 6.5 to 7.5 .
脱臭手段と亜硝酸化手段同一の手段、または別の手段として設けられた請求項記載の装置。 The apparatus according to claim 3 , wherein the deodorizing means and the nitritation means are provided as the same means or as different means. 脱窒手段へ供給する液量が、脱臭手段及び/又は亜硝酸化手段へ供給する液量の1/10以下である請求項3または4記載の装置。 The apparatus according to claim 3 or 4 , wherein the amount of liquid supplied to the denitrification means is 1/10 or less of the amount of liquid supplied to the deodorization means and / or nitritation means.
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