JP2002153728A - Biological deodorization method and device for ammonia- containing odor gas - Google Patents
Biological deodorization method and device for ammonia- containing odor gasInfo
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- JP2002153728A JP2002153728A JP2000351305A JP2000351305A JP2002153728A JP 2002153728 A JP2002153728 A JP 2002153728A JP 2000351305 A JP2000351305 A JP 2000351305A JP 2000351305 A JP2000351305 A JP 2000351305A JP 2002153728 A JP2002153728 A JP 2002153728A
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- Japan
- Prior art keywords
- ammonia
- circulating water
- nitrification
- buffer solution
- denitrification
- Prior art date
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、臭気ガスの生物学
的脱臭方法に係り、特に、アンモニアを含む、堆肥化施
設、下水処理施設、し尿処理施設、ごみ処理施設、各種
工場等から発生する臭気ガスを、生物学的に脱臭する方
法と装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for biological deodorization of odorous gas, and more particularly to a method for producing odor gas from a composting facility, a sewage treatment facility, a human waste treatment facility, a waste treatment facility, various factories, etc., containing ammonia. The present invention relates to a method and an apparatus for biologically deodorizing odorous gas.
【０００２】[0002]
【従来の技術】近年、生ゴミや汚泥等の堆肥化処理への
要求が高まりつつある中で、堆肥化施設から発生するア
ンモニアを高濃度で含むガスの処理が問題となってい
る。従来、アンモニア含有ガスの脱臭は、水や、酸等の
薬液を吸収剤とする湿式洗浄法で行われるのが一般的で
あった。しかし、この方法では、大量の水や薬剤が必要
であるばかりでなく、アンモニアを含有する排水が大量
に排出されるといった問題がある。また、活性炭やゼオ
ライト等の吸着剤による脱臭法が適用される場合もある
が、これらの吸着剤はアンモニア吸着量が少ないため
に、アンモニアの負荷が高い場合には大量の吸着剤が必
要であると共に、吸着剤交換作業が煩雑であり、また、
使用済み吸着剤といった廃棄物が発生するという問題が
ある。2. Description of the Related Art In recent years, as the demand for composting garbage and sludge has been increasing, the treatment of gas containing ammonia at a high concentration generated from a composting facility has become a problem. Conventionally, deodorization of an ammonia-containing gas has generally been performed by a wet cleaning method using a chemical solution such as water or an acid as an absorbent. However, this method not only requires a large amount of water and chemicals, but also has a problem that a large amount of wastewater containing ammonia is discharged. In some cases, a deodorizing method using an adsorbent such as activated carbon or zeolite is applied.However, since these adsorbents have a small amount of adsorbed ammonia, a large amount of adsorbent is required when the load of ammonia is high. At the same time, adsorbent replacement work is complicated,
There is a problem that waste such as used adsorbent is generated.
【０００３】これらの脱臭方法に対して、硫黄系悪臭物
質含有ガスの処理において、近年実績を挙げ、注目され
ている充填塔式生物脱臭法は、維持管理が容易でランニ
ングコストが低いといった利点がある。しかし、この方
法で、アンモニア含有臭気を処理した場合、大きな問題
点が二つある。まず、第一に、アンモニアが生物学的に
硝化されると、散水に用いる循環水中に硝酸性窒素が蓄
積することである。硝酸性窒素の過剰な蓄積は、処理性
能に影響を与えるため、長期間脱臭性能を維持すること
が困難となる。硝酸性窒素の蓄積を抑えるためには、こ
れを希釈するために大量の水が必要であると同時に、硝
酸性窒素含有排水が大量に排出される。したがって、堆
肥化施設等のように使用水量及び排水量が制限される施
設に適用するのは困難であった。[0003] In contrast to these deodorizing methods, the packed tower type biological deodorizing method, which has recently been shown in the treatment of sulfur-containing malodorous substance-containing gas and has attracted attention, has the advantages of easy maintenance and low running cost. is there. However, when the ammonia-containing odor is treated by this method, there are two major problems. First, when ammonia is biologically nitrified, nitrate nitrogen accumulates in the circulating water used for watering. Excessive accumulation of nitrate nitrogen affects the processing performance, making it difficult to maintain the deodorizing performance for a long period of time. In order to suppress the accumulation of nitrate nitrogen, a large amount of water is required to dilute the nitrate, and at the same time, a large amount of wastewater containing nitrate nitrogen is discharged. Therefore, it has been difficult to apply to facilities where the amount of used water and the amount of drainage are limited, such as composting facilities.
【０００４】この問題に対して、先に、前記アンモニア
含有臭気ガスの生物脱臭方法において、硝化工程と脱窒
素工程とを組合せることによって、臭気中のアンモニア
を窒素ガスまで変換する方法を提案している。この方法
では、水相への窒素成分の蓄積が抑えられると共に、硝
化反応と脱窒素反応がバランス良く進行することで、循
環水のｐＨは中性に維持されるため、水の再利用が可能
である。したがって、この方法によれば、使用水量及び
排水量の問題は解決される。第二の問題点は、一般的
に、アンモニア含有臭気中のアンモニア濃度は、変動が
極めて大きいため、前記の方法を採用するだけでは、生
物学的脱臭方法で安定した性能を維持するのが困難とい
うことにある。特に、アンモニア濃度が急激に上昇する
と、硝化反応が追いつかず、循環水に一時的にアンモニ
アが高濃度に蓄積するため、循環水のｐＨが上昇する。
その結果、臭気からのアンモニアの吸収除去性能を低下
させると共に、生物学的硝化脱窒素反応が阻害される。[0004] In order to solve this problem, there has been proposed a method for converting ammonia in odor to nitrogen gas by combining a nitrification step and a denitrification step in the biological deodorization method for ammonia-containing odor gas. ing. In this method, the accumulation of nitrogen components in the aqueous phase is suppressed, and the nitrification reaction and the denitrification reaction proceed in a well-balanced manner, so that the pH of the circulating water is maintained at a neutral value, so that water can be reused. It is. Therefore, according to this method, the problems of the amount of water used and the amount of drainage are solved. The second problem is that, in general, the ammonia concentration in the ammonia-containing odor fluctuates greatly, so that it is difficult to maintain stable performance by the biological deodorization method only by employing the above method. That is. In particular, when the ammonia concentration rises sharply, the nitrification reaction cannot catch up, and ammonia temporarily accumulates in the circulating water at a high concentration, so that the pH of the circulating water rises.
As a result, the performance of absorbing and removing ammonia from odor is reduced, and the biological nitrification denitrification reaction is inhibited.
【０００５】さらに、ｐＨが上昇すると、次の（１）式
の様に、循環水に吸収されたアンモニアの大部分が遊離
のアンモニアとなり、この遊離のアンモニアは、高濃度
になると生物学的硝化反応を著しく阻害する。硝化菌は
増殖速度が遅いため、一度、遊離のアンモニア濃度が上
昇すると、長期間にわたってアンモニア除去性能が低下
する。 ＮＨ4 + + ＯＨ- → ＮＨ3 + Ｈ2Ｏ （１） また、このようなアンモニア負荷及び循環水ｐＨの大幅
な変動は、硝化反応と脱窒素反応のバランスを崩すこと
にもつながる。その結果、循環水に硝酸性窒素が蓄積し
てｐＨが過度に低下し、硝化脱窒素反応が阻害されるた
め、アンモニア除去性能が低下することにもなる。Further, when the pH rises, most of the ammonia absorbed in the circulating water becomes free ammonia as shown in the following equation (1). When the free ammonia becomes high in concentration, it becomes biologically nitrified. Significantly inhibits the reaction. Since nitrifying bacteria have a slow growth rate, once the free ammonia concentration increases, the ammonia removal performance decreases over a long period of time. NH 4 + + OH - → NH 3 + H 2 O (1) In addition, a significant variation of such ammonia load and circulating water pH also leads to imbalance of nitrification and denitrification. As a result, nitrate nitrogen accumulates in the circulating water and the pH is excessively lowered, and the nitrification denitrification reaction is inhibited, so that the ammonia removal performance is also reduced.
【０００６】以上のように、生物脱臭法によるアンモニ
ア含有臭気ガスの処理において、ｐＨの安定化は、性能
を維持するための最も重要な因子の一つである。ｐＨを
安定させる方法としては、酸剤やアルカリ剤でｐＨ制御
する方法がある。しかし、循環式硝化脱窒素処理におい
てこの方法を採用すると、次の問題が生じる。 （１）アンモニアが蓄積した場合は、酸剤を添加するの
に対して、硝酸が蓄積した場合は、アルカリ剤を添加す
る必要があるため、中和剤の添加量が膨大となる。 （２）硝化・脱窒素反応が完了した際には、前記（１）
で添加した中和剤は残留物となるため、これを再度中和
しなければならな場合があるため、中和剤の添加量が膨
大となる。 （３）ｐＨが至適域に維持されても、添加した中和剤に
起因する塩濃度の上昇が、硝化脱窒素反応を阻害する。As described above, in the treatment of ammonia-containing odor gas by the biological deodorization method, stabilization of pH is one of the most important factors for maintaining performance. As a method of stabilizing the pH, there is a method of controlling the pH with an acid agent or an alkali agent. However, when this method is employed in the circulating nitrification denitrification treatment, the following problem occurs. (1) When ammonia accumulates, an acid agent is added. On the other hand, when nitric acid accumulates, an alkali agent needs to be added. Therefore, the amount of the neutralizer added becomes enormous. (2) When the nitrification / denitrification reaction is completed, the above (1)
Since the neutralizing agent added in the step becomes a residue, it may be necessary to neutralize the neutralizing agent again, so that the amount of the neutralizing agent added becomes enormous. (3) Even if the pH is maintained in the optimum range, an increase in the salt concentration caused by the added neutralizing agent inhibits the nitrification denitrification reaction.
【０００７】また、これらの方法の問題点を解決するた
めに、微生物担体にカルシウム分を含む無機多孔質担体
硬化体を用いると共に、循環水をリン酸含有水とするア
ンモニア含有排ガスの生物脱臭方法が提案されている。
この方法では、アンモニアとリン酸との反応により、リ
ン酸がアンモニアを固定するため、装置立ち上時におけ
る微生物の硝化反応が不充分な場合でも、臭気を無臭化
できるとされている。また、次の（２）式の様に、リン
酸水素カルシウムは、アンモニアの作用により水酸リン
灰石となってリン酸放出するため、このリン酸によって
中和されるとしている。 １０ＣａＨＰＯ4 + ２Ｈ2Ｏ → Ｃａ10（ＰＯ4）6（ＯＨ）2 ＋ ４Ｈ3ＰＯ4 （２）Further, in order to solve the problems of these methods, a method of biologically deodorizing an ammonia-containing exhaust gas using a cured inorganic porous carrier containing calcium as a microorganism carrier and using circulating water as phosphoric acid-containing water. Has been proposed.
According to this method, phosphoric acid fixes ammonia by the reaction between ammonia and phosphoric acid, so that even if the nitrification reaction of microorganisms at the time of starting the apparatus is insufficient, it is said that odor can be deodorized. Further, as shown in the following formula (2), calcium hydrogen phosphate is converted into hydroxyapatite by the action of ammonia and releases phosphoric acid, and is neutralized by this phosphoric acid. 10CaHPO 4 + 2H 2 O → Ca 10 (PO 4 ) 6 (OH) 2 + 4H 3 PO 4 (2)
【０００８】一方、アンモニアが生物学的に分解除去さ
れると逆の反応がおこる可能性もあり、再びリン酸は、
リン酸カルシウムとし固定されることもある。つまり、
系内のアンモニア濃度に応じて、リン酸の水相への放出
反応と固相への回収反応が起こる可能性がある。したが
って、薬品使用量の削減及び水相の塩濃度の上昇を防止
することができる。しかし、処理対象臭気のアンモニア
濃度が高濃度で、かつ濃度変動が大きい場合は、次の理
由により、アンモニア濃度変動に追随してｐＨ変動を抑
えることができないため、処理性能を安定させるのが難
しい。 （１）前記（２）式の反応速度が遅い。 （２）循環水のｐＨが中性の条件で、カルシウムとリン
酸が共存している場合、その主な形態はリン酸水素カル
シウムと考えられ、この塩は水に対する溶解度が極めて
小さいことから、液相に存在しているリン酸又はリン酸
塩濃度は極めて低い。On the other hand, when ammonia is biologically decomposed and removed, the opposite reaction may occur.
Sometimes fixed as calcium phosphate. That is,
Depending on the ammonia concentration in the system, a release reaction of phosphoric acid to the aqueous phase and a recovery reaction to the solid phase may occur. Therefore, it is possible to reduce the amount of chemicals used and prevent an increase in the salt concentration of the aqueous phase. However, when the ammonia concentration of the odor to be treated is high and the concentration fluctuation is large, it is difficult to stabilize the processing performance because the pH fluctuation cannot be suppressed following the ammonia concentration fluctuation for the following reason. . (1) The reaction rate of the formula (2) is low. (2) When the pH of the circulating water is neutral and calcium and phosphoric acid coexist, the main form is considered to be calcium hydrogen phosphate, and since this salt has extremely low solubility in water, The concentration of phosphoric acid or phosphate present in the liquid phase is very low.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、上記の問題
点を解決し、高濃度かつ濃度変動が大きいアンモニア含
有臭気ガスの脱臭性能を、低コストかつ極めて簡便な方
法で安定させることができ、かつ、使用水量及び排水量
を低減できる生物脱臭方法と装置を提供することを課題
とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can stabilize the deodorizing performance of an ammonia-containing odor gas having a high concentration and a large concentration fluctuation by a low-cost and extremely simple method. Another object of the present invention is to provide a biological deodorizing method and apparatus capable of reducing the amount of water used and the amount of wastewater.
【００１０】[0010]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明では、アンモニア含有臭気ガスを、硝化工
程で循環水と接触させて含有するアンモニアを吸収し、
硝化菌によって生物学的に硝化処理すると共に、該硝化
液を脱窒素工程に導き、該脱窒素処理液を再び硝化工程
に循環水として返送する循環式硝化脱窒素方式の生物脱
臭法において、該循環水にｐＨ緩衝溶液を用いることと
したものである。前記脱臭方法において、ｐＨ緩衝溶液
は、リン酸塩緩衝溶液とするか、炭酸塩緩衝溶液とする
ことができ、また、ｐＨ緩衝溶液は、薬剤を供給して、
循環水のｐＨが６．０〜７．５の範囲となるようにｐＨ
制御することができる。また、本発明では、内部に、ア
ンモニア含有臭気ガスを通す硝化菌を担持させた充填層
と、該充填層に循環水を散水する散水装置と、循環水を
貯留する循環水槽とを有する硝化脱臭塔と、該硝化脱臭
塔からの硝化液を脱窒素処理する脱窒素槽と、該脱窒素
槽と前記硝化脱臭塔とを循環水が循環する経路とを有す
る生物脱臭装置において、前記循環水にｐＨ緩衝溶液を
用いることとしたものである。In order to solve the above-mentioned problems, in the present invention, an ammonia-containing odor gas is brought into contact with circulating water in a nitrification step to absorb the contained ammonia,
In a biological deodorization method of a circulating nitrification denitrification method in which a nitrification liquid is biologically nitrified by a nitrifying bacterium, the nitrification liquid is guided to a denitrification step, and the denitrification treatment liquid is returned to the nitrification step again as circulating water. In this case, a pH buffer solution is used as circulating water. In the deodorizing method, the pH buffer solution can be a phosphate buffer solution or a carbonate buffer solution, and the pH buffer solution supplies a drug,
PH so that the pH of the circulating water is in the range of 6.0 to 7.5.
Can be controlled. Further, in the present invention, a nitrification deodorizer having a packed bed in which nitrifying bacteria that allow ammonia-containing odor gas to pass therethrough, a water spray device for spraying circulating water to the packed bed, and a circulating water tank for storing circulating water are provided. A biological deodorization apparatus having a tower, a denitrification tank for denitrifying the nitrification liquid from the nitrification deodorization tower, and a path through which circulating water circulates through the denitrification tank and the nitrification deodorization tower. In this case, a pH buffer solution is used.
【００１１】[0011]
【発明の実施の形態】本発明は、循環式硝化脱窒素方式
の生物脱臭法によるアンモニアの処理に関して、次の点
に着目し、循環水に単なる生物処理水を用いる代わり
に、ｐＨを安定させる目的で工業的に汎用されているｐ
Ｈ緩衝溶液を利用したものである。 （１）循環式硝化脱窒素処理では、反応が過不足なく行
われれば、本来ｐＨ調整は不要である。したがって、ア
ンモニア濃度が高く変動が大きい場合は、アンモニアや
硝酸の蓄積に起因する一時的なｐＨ変動さえ防止すれば
良い。 （２）生物脱臭法においては、水は、処理対象物ではな
く、生物学的硝化脱窒素反応を進行させるための単なる
媒体であり、循環式硝化脱窒素反応が過不足なく行われ
れば、水質変化を生じないことから、系外に排水せず何
度でも循環再利用できる。BEST MODE FOR CARRYING OUT THE INVENTION The present invention focuses on the following points with respect to the treatment of ammonia by a biological deodorization method of a circulating nitrification and denitrification system, and stabilizes the pH instead of using only biologically treated water as circulating water. For industrial purposes
H buffer solution was used. (1) In the recirculation type nitrification denitrification treatment, if the reaction is carried out without excess or deficiency, pH adjustment is essentially unnecessary. Therefore, when the ammonia concentration is high and the fluctuation is large, it is only necessary to prevent the temporary pH fluctuation caused by the accumulation of ammonia or nitric acid. (2) In the biological deodorization method, water is not an object to be treated, but a mere medium for advancing a biological nitrification and denitrification reaction. Since there is no change, it can be recycled and reused many times without draining out of the system.
【００１２】循環式硝化脱窒素方式の生物脱臭法による
アンモニア含有臭気ガスの処理は、次の（３）式〜
（５）式に従って進行する。 ＮＨ3 + Ｈ2Ｏ → ＮＨ4 + + ＯＨ- （３） ＮＨ4 + +２Ｏ2 → ＮＯ3 - +２Ｈ+ + Ｈ2Ｏ （４） ２ＮＯ3 - + ５Ｈ2 → Ｎ2 ＋ ２ＯＨ- + ４Ｈ2Ｏ （５） 該処理においては、（３）式のアンモニアの蓄積と
（５）式の脱窒素反応により、水酸化物イオン濃度が上
昇してｐＨが上昇するのに対して、（４）式の硝化反応
により、水素イオン濃度が上昇してｐＨが低下する。
（３）〜（５）式の反応が完結して、アンモニアが窒素
ガスまで変換されると、ｐＨの上昇分と低下分が相殺さ
れて、ｐＨは一定となる。The treatment of the ammonia-containing odor gas by the biological deodorization method of the circulating nitrification and denitrification method is carried out by the following formula (3)
Proceed according to equation (5). NH 3 + H 2 O → NH 4 + + OH - (3) NH 4 + + 2O 2 → NO 3 - + 2H + + H 2 O (4) 2NO 3 - + 5H 2 → N 2 + 2OH - + 4H 2 O (5) In the treatment, the concentration of hydroxide ion increases and the pH increases due to the accumulation of ammonia in the formula (3) and the denitrification reaction in the formula (5), whereas (4) By the nitrification reaction of the formula, the hydrogen ion concentration increases and the pH decreases.
When the reactions of formulas (3) to (5) are completed and ammonia is converted to nitrogen gas, the increase and decrease in pH are offset, and the pH becomes constant.
【００１３】しかし、アンモニア負荷の変動により、こ
れらの反応のバランスが崩れると、アンモニアや硝酸の
蓄積によりｐＨの変動が生じる。適切なｐＨ域以外で
は、臭気からのアンモニアの吸収除去性能を低下させる
だけでなく、生物学的硝化脱窒素反応が阻害されるた
め、一度適切なｐＨ域を外れると、その後ｐＨを調整し
ても生物学的反応はすぐには回復しない。したがって、
長期間にわたってアンモニア除去性能が低下する。本発
明においては、前記の如く、アンモニア含有臭気を処理
する生物脱臭装置の循環水にｐＨ緩衝溶液を用いている
ため、一時的にアンモニアや硝酸イオンが蓄積しても、
水酸化物イオン濃度と水素イオン濃度を一定に維持させ
るｐＨ緩衝作用が直ちに働くためｐＨが一定に保たれ
る。ｐＨ緩衝溶液としてリン酸塩緩衝液を用いた場合の
ｐＨ緩衝作用は、（６）式及び（７）式で示される。 ＨＰＯ4 2- ＋ Ｈ+ → Ｈ2ＰＯ4 - （６） Ｈ2ＰＯ4 - ＋ ＯＨ- → ＨＰＯ4 2- ＋ Ｈ2Ｏ （７）However, when the balance of these reactions is lost due to the change in the ammonia load, the pH changes due to the accumulation of ammonia and nitric acid. Outside of the appropriate pH range, not only does the performance of absorbing and removing ammonia from odors decrease, but also the biological nitrification denitrification reaction is inhibited, so once outside the appropriate pH range, the pH is adjusted thereafter. The biological response does not recover immediately. Therefore,
Ammonia removal performance decreases over a long period of time. In the present invention, as described above, since the pH buffer solution is used in the circulating water of the biological deodorizer for treating the ammonia-containing odor, even if ammonia or nitrate ions are temporarily accumulated,
The pH is kept constant because a pH buffering action for maintaining the hydroxide ion concentration and the hydrogen ion concentration constant is immediately performed. The pH buffering action when a phosphate buffer is used as the pH buffer solution is expressed by equations (6) and (7). HPO 4 2- + H + → H 2 PO 4 - (6) H 2 PO 4 - + OH - → HPO 4 2- + H 2 O (7)
【００１４】したがって、一時的にアンモニアや硝酸イ
オンが蓄積しても、ｐＨ変動による硝化脱窒素反応の阻
害が無いため、一時的に蓄積したアンモニアや硝酸は、
処理を継続していくうちにいずれ窒素ガスに変換され
る。また、アルカリ剤や酸剤を用いた場合は、ｐＨ調整
効果は一過性であるのに対して、ｐＨ緩衝液を利用した
場合のｐＨ調整効果は、アンモニアや硝酸イオンが窒素
ガスまで変換されることによってｐＨ緩衝能が復活する
持続性のものである。前記のとおり、生物脱臭法では、
水は処理対象ではなく、微生物反応を進行させるための
媒体であるから、系外に排出する量を極力少なくして循
環再利用できる。したがって、使用水量の削減や、排水
量を低減あるいは無排水方式にできるばかりでなく、循
環水をｐＨ緩衝液とするために添加する薬剤（以下、ｐ
Ｈ緩衝剤とする）の量も少なくて良い。無排水方式の場
合のｐＨ緩衝剤の主な損失は、ミストとして処理ガスに
同伴して排出される分、及び微生物の栄養源として消費
される分のみである。Therefore, even if ammonia or nitrate ions temporarily accumulate, there is no inhibition of the nitrification denitrification reaction due to pH fluctuation.
As the process continues, it is eventually converted to nitrogen gas. When an alkaline agent or an acid agent is used, the pH adjustment effect is transient, whereas when a pH buffer is used, the pH adjustment effect is that ammonia and nitrate ions are converted to nitrogen gas. By doing so, the pH buffer capacity is restored to a constant level. As described above, in the biological deodorization method,
Since water is not a treatment target but a medium for promoting a microbial reaction, the amount of water discharged outside the system can be minimized and recycled. Therefore, not only can the amount of water used be reduced, the amount of wastewater can be reduced, or a non-drainage system can be used, but also a chemical added to make circulating water a pH buffer (hereinafter referred to as p
H buffer) may be small. The main loss of the pH buffer in the non-drainage method is only the amount discharged as mist accompanying the processing gas and the amount consumed as a nutrient source of microorganisms.
【００１５】ｐＨ緩衝剤は、これらの損失分を計算した
量を適宜供給しても良いが、循環水のｐＨを測定し、そ
の測定値によってｐＨ緩衝剤の供給量を制御することも
できる。ｐＨ制御注入の方法は、ｐＨ緩衝剤の濃厚溶液
を直接注入して行うことができる。また、ｐＨ緩衝剤は
一般的に、アルカリ性の成分と酸性の成分の二成分で構
成されていることが多いので、これらの成分を循環水に
別々に注入してｐＨ制御しても良い。なお、循環水のｐ
Ｈは、６．０〜７．５の範囲で制御することが好適であ
る。The pH buffer may be supplied in an amount obtained by calculating the amount of the loss, but the pH of the circulating water may be measured, and the supply of the pH buffer may be controlled based on the measured value. The pH control injection method can be performed by directly injecting a concentrated solution of a pH buffer. In addition, since the pH buffer is generally composed of two components, an alkaline component and an acidic component, these components may be separately injected into circulating water to control the pH. In addition, p of the circulating water
H is preferably controlled in the range of 6.0 to 7.5.
【００１６】本発明で用いるｐＨ緩衝溶液としては、リ
ン酸塩緩衝液、炭酸塩緩衝液等の、生物学的硝化脱窒素
反応に影響を与えないものが良い。この場合のｐＨ緩衝
剤の組み合わせとしては、緩衝溶液自体のｐＨが中性と
なるものが良く、例えば、リン酸二水素カリウム＋リン
酸水素二カリウム、リン酸二水素ナトリウム＋リン酸水
素ニナトリウム、リン酸三カリウム＋リン酸、リン酸三
ナトリウム＋リン酸、リン酸三カリウム＋硫酸、リン酸
三ナトリウム＋硫酸、リン酸三カリウム＋塩酸、リン酸
三ナトリウム＋塩酸、リン酸二水素カリウム＋硫酸、リ
ン酸二水素ナトリウム＋硫酸、リン酸二水素カリウム＋
水酸化カリウム、リン酸二水素ナトリウム＋水酸化ナト
リウム、リン酸＋リン酸水素二カリウム、リン酸＋リン
酸水素二ナトリウム、リン酸＋リン酸二水素カリウム、
リン酸＋リン酸二水素ナトリウム、炭酸カリウム＋硫
酸、炭酸カリウム＋塩酸、炭酸ナトリウム＋硫酸、炭酸
ナトリウム＋塩酸、炭酸水素カリウム＋硫酸、炭酸水素
カリウム＋塩酸、炭酸水素ナトリウム＋硫酸、炭酸水素
ナトリウム＋塩酸等の組合せを、ｐＨが中性となる混合
比で用いる。また、臭気ガス中に炭酸ガスを高濃度で含
む場合には、循環水中に、炭酸水素ナトリウム、炭酸水
素カリウム、炭酸カリウム、炭酸ナトリウム、水酸化カ
リウム、水酸化ナトリウム等のアルカリ剤を添加して、
臭気ガス中の炭酸ガスを吸収させれば良い。As the pH buffer solution used in the present invention, those which do not affect the biological nitrification denitrification reaction, such as a phosphate buffer and a carbonate buffer, are preferred. In this case, the combination of the pH buffering agents is preferably such that the pH of the buffer solution itself is neutral, for example, potassium dihydrogen phosphate + dipotassium hydrogen phosphate, sodium dihydrogen phosphate + disodium hydrogen phosphate , Tripotassium phosphate + phosphoric acid, Trisodium phosphate + phosphoric acid, Tripotassium phosphate + sulfuric acid, Trisodium phosphate + sulfuric acid, Tripotassium phosphate + hydrochloric acid, Trisodium phosphate + hydrochloric acid, Potassium dihydrogen phosphate + Sulfuric acid, sodium dihydrogen phosphate + Sulfuric acid, potassium dihydrogen phosphate +
Potassium hydroxide, sodium dihydrogen phosphate + sodium hydroxide, phosphoric acid + dipotassium hydrogen phosphate, phosphoric acid + disodium hydrogen phosphate, phosphoric acid + potassium dihydrogen phosphate,
Phosphoric acid + sodium dihydrogen phosphate, potassium carbonate + sulfuric acid, potassium carbonate + hydrochloric acid, sodium carbonate + sulfuric acid, sodium carbonate + hydrochloric acid, potassium hydrogen carbonate + sulfuric acid, potassium hydrogen carbonate + hydrochloric acid, sodium hydrogen carbonate + sulfuric acid, sodium hydrogen carbonate + A combination of hydrochloric acid and the like is used at a mixing ratio at which the pH becomes neutral. If the odor gas contains a high concentration of carbon dioxide, add an alkali agent such as sodium hydrogen carbonate, potassium hydrogen carbonate, potassium carbonate, sodium carbonate, potassium hydroxide, sodium hydroxide to the circulating water. ,
What is necessary is just to absorb the carbon dioxide gas in the odor gas.
【００１７】本発明の方法において、臭気ガスが導入さ
れる硝化工程の形態は、曝気水槽等を用いたガス分散方
式でもよいが、臭気中のアンモニアは水に極めて吸収さ
れやすいため、充填塔、スプレー塔、ベンチュリースク
ラバー、サイクロンスクラバー等の液分散方式でも良
い。また、脱窒素工程は、無酸素状態に維持する必要が
あるため、反応相を水没式にする必要があるが、その形
態は、活性汚泥方式、流動床方式、固定床方式のいずれ
でも良い。また、硝化工程が、液分散型方式の場合は、
循環水槽を脱窒素槽と兼用しても良い。脱窒素反応速度
を高めたい場合は、適宜、水素供与体を脱窒素工程に供
給すれば良い。水素供与体は、使用水量及び排水量削減
の観点から、分解生成物が循環水中に残留しないものを
用いるのが好ましい。このような水素供与体の例として
は、メタノール、エタノール、酢酸、アセトン、グルコ
ース等の有機化合物や水素ガス等が挙げられる。In the method of the present invention, the form of the nitrification step in which the odor gas is introduced may be a gas dispersion method using an aeration tank or the like. However, since ammonia in the odor is extremely easily absorbed by water, A liquid dispersion system such as a spray tower, a venturi scrubber, and a cyclone scrubber may be used. In the denitrification step, the reaction phase needs to be submerged because it is necessary to maintain an oxygen-free state. The form may be any of an activated sludge system, a fluidized bed system, and a fixed bed system. Also, when the nitrification step is a liquid dispersion type,
The circulating water tank may also be used as a denitrification tank. When it is desired to increase the denitrification reaction rate, a hydrogen donor may be appropriately supplied to the denitrification step. As the hydrogen donor, it is preferable to use a hydrogen donor from which decomposition products do not remain in the circulating water from the viewpoint of reducing the amount of water used and the amount of wastewater. Examples of such a hydrogen donor include organic compounds such as methanol, ethanol, acetic acid, acetone, and glucose, and hydrogen gas.
【００１８】以下に、本発明を図面を参照して詳細に説
明する。図１は本発明の脱臭方法に用いる装置の一例を
示す概略構成図である。硝化工程である硝化・脱臭塔３
は、微生物を担持させるための充填材を充填した充填層
７と、充填層７に散水するための散水部６と、散水する
ための散水ポンプ８と、循環水を貯留するための循環水
槽５を備える。また、脱窒素工程の脱窒素槽４は、微生
物を担持させるための充填材を充填した充填層１０と脱
窒素処理液を硝化工程に返送する処理液循環ポンプ９を
備える。なお、脱窒素工程に供給される硝化液には、水
素供与体貯留槽１２より水素供与体を水素供与体供給ポ
ンプ１３で供給する。循環水槽５に微生物を含む活性汚
泥等の種汚泥を添加し、循環水ポンプ８で散水部６から
充填層７に対して循環散水すると共に、処理液循環ポン
プ９で充填層１０に種汚泥を供給する。同時にアンモニ
アを含む臭気ガス１を硝化・脱臭塔３に導入し、アンモ
ニアを除去するための脱臭を行う。なお、循環水には、
アンモニア及び硝酸性窒素が蓄積しても、ｐＨを６．０
〜７．５に維持できるように、循環水にｐＨ緩衝剤を添
加しておく。Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of an apparatus used for the deodorizing method of the present invention. Nitrification / deodorization tower 3 in the nitrification process
Are a packed bed 7 filled with a filler for supporting microorganisms, a water spraying unit 6 for spraying water on the packed bed 7, a watering pump 8 for spraying water, and a circulating water tank 5 for storing circulating water. Is provided. The denitrification tank 4 in the denitrification step includes a packed bed 10 filled with a filler for supporting microorganisms and a treatment liquid circulation pump 9 for returning the denitrification treatment liquid to the nitrification step. In addition, a hydrogen donor is supplied from a hydrogen donor storage tank 12 to a nitrification liquid supplied to the denitrification step by a hydrogen donor supply pump 13. Seed sludge such as activated sludge containing microorganisms is added to the circulating water tank 5, and circulating water is sprayed from the water sprinkling section 6 to the packed bed 7 by the circulating water pump 8. Supply. At the same time, the odor gas 1 containing ammonia is introduced into the nitrification / deodorization tower 3 to perform deodorization for removing ammonia. The circulating water includes
Even if ammonia and nitrate nitrogen accumulate, the pH is adjusted to 6.0.
A pH buffer is added to the circulating water so that it can be maintained at ７7.5.
【００１９】図２は本発明の脱臭方法に用いる装置の他
の例を示す概略構成図である。硝化工程である硝化・脱
臭塔３は、微生物を担持させるための充填材を充填した
充填層７と、充填層７に散水するための散水部６と、散
水するための散水ポンプ８と、循環水を貯留するための
循環水槽５を備える。また、脱窒素工程の脱窒素槽４
は、微生物を担持させるための充填材を充填した充填層
１０と、脱窒素処理液を硝化工程に返送するための処理
液循環ポンプ９を備える。なお、脱窒素工程に供給され
る硝化液には、水素供与体貯留槽１２より水素供与体を
水素供与体供給ポンプ１３で供給する。循環水槽５に微
生物を含む活性汚泥等の種汚泥を添加し、循環水ポンプ
８で散水部６から充填層７に対して循環散水すると共
に、処理液循環ポンプ９で充填層１０に種汚泥を供給す
る。同時にアンモニアを含む臭気ガス１を硝化脱臭塔３
に導入し、アンモニアを除去するための脱臭を行う。な
お、循環水のｐＨは、循環水槽に設置されたｐＨ計１６
からの信号１７をもとに、ｐＨ緩衝剤１４をｐＨ緩衝剤
供給ポンプ１５でｐＨ制御注入する。FIG. 2 is a schematic diagram showing another example of the apparatus used in the deodorizing method of the present invention. The nitrification / deodorization tower 3, which is a nitrification step, includes a packed bed 7 filled with a filler for supporting microorganisms, a water sprinkling unit 6 for sprinkling water on the packed bed 7, a water sprinkling pump 8 for sprinkling water, and a circulation system. A circulating water tank 5 for storing water is provided. In addition, the denitrification tank 4 in the denitrification step
Includes a packed bed 10 filled with a filler for supporting microorganisms, and a treatment liquid circulation pump 9 for returning the denitrification treatment liquid to the nitrification step. In addition, a hydrogen donor is supplied from a hydrogen donor storage tank 12 to a nitrification liquid supplied to the denitrification step by a hydrogen donor supply pump 13. Seed sludge such as activated sludge containing microorganisms is added to the circulating water tank 5, and circulating water is supplied from the water sprinkling section 6 to the packed bed 7 by the circulating water pump 8, and the seed sludge is supplied to the packed bed 10 by the treatment liquid circulating pump 9. Supply. At the same time, the odor gas 1 containing ammonia is converted into the nitrification deodorization tower 3
And deodorizing to remove ammonia. The pH of the circulating water was measured using a pH meter 16 installed in the circulating water tank.
, A pH buffer 14 is supplied by a pH buffer supply pump 15 for pH control.
【００２０】[0020]
【実施例】以下、本発明を実施例により具体的に説明す
るが、本発明はこの実施例こ限定されない。 実施例１ 図１に示す構造の装置を用いた。堆肥化施設から発生す
るアンモニア含有臭気ガスを対象とした。なお、臭気ガ
ス中のアンモニア濃度は、堆肥化の状態及び堆肥の耕転
工程等に影響を受けて激しく変動する。実験条件は次の
とおりである。EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples. Example 1 An apparatus having the structure shown in FIG. 1 was used. Ammonia-containing odorous gas generated from composting facilities was targeted. The ammonia concentration in the odor gas fluctuates drastically under the influence of the composting state and the composting process. The experimental conditions are as follows.
【００２１】 臭気ガス中のアンモニア濃度 ：５〜５００ｐｐｍ 臭気ガス温度 ：３０〜４０℃ 処理風量 ：４０ｍ3／ｍｉｎ 硝化工程の空塔速度 ：２００ｈ-1 硝化工程の散水量（単位処理ガス量あたりの散水量）：３リットル／ｍ3 硝化工程の循環水槽容量 ：１０ｍ3 補給水量 ：５０リットル／日 硝化・脱窒素循環水量 ：２リットル／分 脱窒素槽の充填層容量 ：１０ｍ3 水素供与体の種類 ：メタノール 循環水の種類 ：リン酸塩緩衝溶液The ammonia concentration in the odorous gas: 5 to 500 ppm Odor gas temperature: 30 to 40 ° C. processing air volume: superficial velocity 40 m 3 / min nitrification process: 200h -1 watering amount of nitrification step (per weight unit process gas Amount of water sprayed): 3 liters / m 3 Circulating water tank capacity in the nitrification process: 10 m 3 Replenishment water volume: 50 liters / day Nitrogenizing and denitrifying circulating water quantity: 2 liters / min Filling layer capacity of the denitrifying tank: 10 m 3 Type: Methanol Circulating water type: Phosphate buffer solution
【００２２】循環水をｐＨ緩衝溶液とするための薬剤の
注入方法 ：定量注入 循環水槽に濃度約１．２ｇ／Ｌの硝化槽汚泥１ｍ3を投
入後、循環水を連続的に散水しながら、臭気ガスを連続
的に通気した。通気開始直後からアンモニア除去率は９
０％以上であり、以後安定した除去率を示した。なお、
１日あたりのｐＨ緩衝剤添加量は、リン酸二水素カリウ
ム０．６８ｋｇ、リン酸水素二カリウム０．８８ｋｇで
あった。運転開始から約１か月経過時までのアンモニア
除去性能を表１に示す。Method for injecting chemicals to make circulating water into a pH buffer solution: quantitative injection After injecting 1 m 3 of nitrification tank sludge having a concentration of about 1.2 g / L into the circulating water tank, the circulating water was continuously sprinkled with water. Odor gas was continuously vented. Immediately after the start of ventilation, the ammonia removal rate was 9
0% or more, and thereafter showed a stable removal rate. In addition,
The amount of the pH buffer added per day was 0.68 kg of potassium dihydrogen phosphate and 0.88 kg of dipotassium hydrogen phosphate. Table 1 shows the ammonia removal performance from the start of operation until about one month has elapsed.
【００２３】実施例２ 図２に示す構造の実験装置を用いた。運転条件は、ｐＨ
緩衝剤の供給方法を循環水に定量注入するのではなく、
循環水ｐＨが６．０〜７．５となるようにｐＨ制御注入
したこと以外は実施例１と同じである。循環水槽に濃度
約１．２ｇ／Ｌの硝化槽汚泥１ｍ3を投入後、循環水を
連続的に散水しながら、臭気ガスを連続的に通気した。
通気開始直後からアンモニア除去率は９０％以上であ
り、以後安定した除去率を示した。なお、１日あたりの
ｐＨ緩衝剤添加量は、リン酸二水素カリウム０．２７ｋ
ｇ、リン酸水素二カリウム０．３５ｋｇであった。運転
開始から約１か月経過時までのアンモニア除去性能を表
１に示す。Example 2 An experimental apparatus having the structure shown in FIG. 2 was used. Operating conditions are pH
Instead of injecting a fixed amount of buffer into the circulating water,
This is the same as Example 1 except that pH control injection was performed so that the circulating water pH was 6.0 to 7.5. After charging 1 m 3 of the nitrification tank sludge having a concentration of about 1.2 g / L into the circulating water tank, the odor gas was continuously aerated while the circulating water was sprinkled continuously.
Immediately after the start of aeration, the ammonia removal rate was 90% or more, and thereafter, a stable removal rate was exhibited. The amount of the pH buffer added per day was 0.27 kP
g, dipotassium hydrogen phosphate 0.35 kg. Table 1 shows the ammonia removal performance from the start of operation until about one month has elapsed.
【００２４】比較例１ 実施例１と同じ構造の装置を用いた。運転条件は、循環
水にｐＨ緩衝剤を注入しなかったこと以外は実施例１と
同じである。循環水槽に濃度約１．２ｇ／Ｌの硝化槽汚
泥１ｍ3を投入後、循環水を連続的に散水しながら、臭
気ガスを連続的に通気した。通気開始直後はアンモニア
除去率は９０％以上であったものの、アンモニアの負荷
変動により循環水ｐＨが変動し、アンモニア除去性能は
不安定であった。運転開始から約１か月経過時までのア
ンモニア除去性能を表１に示す。Comparative Example 1 An apparatus having the same structure as in Example 1 was used. The operating conditions were the same as in Example 1, except that no pH buffer was injected into the circulating water. After charging 1 m 3 of the nitrification tank sludge having a concentration of about 1.2 g / L into the circulating water tank, the odor gas was continuously aerated while the circulating water was sprinkled continuously. Immediately after the start of aeration, although the ammonia removal rate was 90% or more, the pH of the circulating water fluctuated due to a change in the ammonia load, and the ammonia removal performance was unstable. Table 1 shows the ammonia removal performance from the start of operation until about one month has elapsed.
【００２５】比較例２ 実施例２と同じ構造の装置を用いた。運転条件は、循環
水ｐＨの制御を、ｐＨ緩衝剤ではなく、硫酸及び水酸化
ナトリウム水溶液といった中和剤を注入して行ったこと
以外は実施例２と同じである。循環水槽に濃度約１．２
ｇ／Ｌの硝化槽汚泥１ｍ3を投入後、循環水を連続的に
散水しながら、臭気ガスを連続的に通気した。通気開始
直後はアンモニア除去率は９０％以上であったものの、
循環水中の塩濃度が徐々に上昇し、硝化性能が低下し
た。さらに、硝化工程の充填層にスケールが発生してガ
スの偏流が生じ、臭気中のアンモニア吸収除去性能も低
下した。運転開始から約１か月経過時までのアンモニア
除去性能を表１に示す。Comparative Example 2 An apparatus having the same structure as in Example 2 was used. The operating conditions are the same as in Example 2 except that the pH of the circulating water was controlled by injecting not a pH buffer but a neutralizing agent such as sulfuric acid and an aqueous solution of sodium hydroxide. Concentration about 1.2 in circulating water tank
After introducing g / L nitrification tank sludge 1 m 3 of, while sprinkling circulation water continuously it was continuously bubbled odorous gas. Immediately after the start of ventilation, although the ammonia removal rate was 90% or more,
The salt concentration in the circulating water gradually increased, and the nitrification performance decreased. In addition, scale was generated in the packed bed in the nitrification step, causing gas drift, and the ability to absorb and remove ammonia in odors was reduced. Table 1 shows the ammonia removal performance from the start of operation until about one month has elapsed.
【００２６】実施例３ ｐＨ緩衝溶液として、炭酸水素ナトリウム及び硫酸を用
いた以外は実施例２と同様に行った。運転開始から約１
か月経過時までのアンモニア除去性能を表１に示す。Example 3 The same procedure as in Example 2 was carried out except that sodium hydrogen carbonate and sulfuric acid were used as the pH buffer solution. About 1 from the start of operation
Table 1 shows the ammonia removal performance up to the lapse of months.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】本発明の方法では、アンモニア含有臭気
ガスを硝化工程に導き、硝化菌によって生物学的に硝化
処理すると共に、該硝化液を脱窒素工程に導き、該脱窒
素処理液を再び硝化工程に返送する循環式硝化脱窒素方
式の生物脱臭法において、該循環水にｐＨ緩衝溶液を用
いることで、アンモニア負荷の変動が大きくかつ、使用
水量及び排水量が制限される場合でも、低コストかつ簡
単な方法で、循環水ｐＨを硝化菌及び脱窒素菌に適した
中性域に維持できるため、生物脱臭法によるアンモニア
の安定除去が可能である。According to the method of the present invention, the ammonia-containing odor gas is led to the nitrification step, and the nitrification liquid is biologically nitrified by the nitrifying bacteria. In the biological deodorization method of the circulating nitrification denitrification system returned to the nitrification process, by using a pH buffer solution for the circulating water, even if the ammonia load fluctuates greatly and the amount of used water and wastewater is restricted, low cost can be achieved. The pH of the circulating water can be maintained in a neutral range suitable for nitrifying bacteria and denitrifying bacteria by a simple method, so that ammonia can be stably removed by a biological deodorization method.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明の脱臭方法に用いる装置の一例を示す概
略構成図。FIG. 1 is a schematic configuration diagram showing an example of an apparatus used for a deodorizing method of the present invention.
【図２】本発明の脱臭方法に用いる装置の他の例を示す
概略構成図。FIG. 2 is a schematic configuration diagram showing another example of an apparatus used for the deodorizing method of the present invention.
【００２９】[0029]
１：臭気ガス、２：処理ガス、３：硝化・脱臭塔、４：
脱窒素槽、５：循環水槽、６：散水部、７：充填層、
８：散水ポンプ、９：処理液循環ポンプ、１０：充填
層、１１：排水、１２：水素供与体貯留槽、１３：水素
供与体供給ポンプ、１４：ｐＨ緩衝剤貯留槽、１５：ｐ
Ｈ緩衝剤供給ポンプ、１６：ｐＨ計、１７：制御信号1: odor gas, 2: processing gas, 3: nitrification / deodorization tower, 4:
Denitrification tank, 5: circulating water tank, 6: water sprinkling part, 7: packed bed,
8: watering pump, 9: treatment liquid circulation pump, 10: packed bed, 11: drainage, 12: hydrogen donor storage tank, 13: hydrogen donor supply pump, 14: pH buffer storage tank, 15: p
H buffer supply pump, 16: pH meter, 17: control signal
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ａ６１Ｌ 9/01 (72)発明者 西井 啓典 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 Ｆターム(参考） 4C080 AA07 BB02 CC08 HH03 JJ04 KK08 LL02 MM33 QQ11 4D002 AA13 AB02 AC10 BA02 BA05 BA17 CA01 CA07 DA03 DA16 DA18 GA01 GB09 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) A61L 9/01 (72) Inventor Hironori Nishii 11-1 Haneda Asahimachi, Ota-ku, Tokyo F-term in Ebara Corporation ( Reference) 4C080 AA07 BB02 CC08 HH03 JJ04 KK08 LL02 MM33 QQ11 4D002 AA13 AB02 AC10 BA02 BA05 BA17 CA01 CA07 DA03 DA16 DA18 GA01 GB09
Claims (5)
循環水と接触させて含有するアンモニアを吸収し、硝化
菌によって生物学的に硝化処理すると共に、該硝化液を
脱窒素工程に導き、該脱窒素処理液を再び硝化工程に循
環水として返送する循環式硝化脱窒素方式の生物脱臭法
において、該循環水にｐＨ緩衝溶液を用いることを特徴
とする脱臭方法。1. An ammonia-containing odor gas is brought into contact with circulating water in a nitrification step to absorb the contained ammonia, to be biologically nitrified by nitrifying bacteria, and to lead the nitrification solution to a denitrification step. A deodorizing method, wherein a pH buffer solution is used as the circulating water in a biological deodorizing method of a circulating nitrifying denitrifying method in which a denitrification treatment liquid is returned to the nitrification step again as circulating water.
であることを特徴とする請求項１記載の脱臭方法。2. The deodorizing method according to claim 1, wherein the pH buffer solution is a phosphate buffer solution.
あることを特徴とする請求項１記載の脱臭方法。3. The method according to claim 1, wherein said pH buffer solution is a carbonate buffer solution.
循環水のｐＨが６．０〜７．５の範囲となるようにｐＨ
制御することを特徴とする請求項１、２又は３記載の脱
臭方法。4. The pH buffered solution provides a drug,
PH so that the pH of the circulating water is in the range of 6.0 to 7.5.
The method according to claim 1, wherein the method is controlled.
硝化菌を担持させた充填層と、該充填層に循環水を散水
する散水装置と、循環水を貯留する循環水槽とを有する
硝化脱臭塔と、該硝化脱臭塔からの硝化液を脱窒素処理
する脱窒素槽と、該脱窒素槽と前記硝化脱臭塔とを循環
水が循環する経路とを有する生物脱臭装置において、前
記循環水にｐＨ緩衝溶液を用いることを特徴とする脱臭
装置。5. A nitrification deodorization tower having therein a packed bed carrying nitrifying bacteria for passing an odor gas containing ammonia, a water spray device for spraying circulating water to the packed bed, and a circulating water tank for storing circulating water. And a biological deodorization apparatus having a denitrification tank for denitrifying the nitrification liquid from the nitrification deodorization tower, and a path through which circulating water circulates through the denitrification tank and the nitrification deodorization tower. A deodorizing device characterized by using a buffer solution.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005034726A (en) * | 2003-07-14 | 2005-02-10 | Kurita Water Ind Ltd | Deodorization method and apparatus |
| WO2011158495A1 (en) * | 2010-06-15 | 2011-12-22 | パナソニック株式会社 | Method for operation of fuel cell system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111715042B (en) * | 2020-07-02 | 2021-07-06 | 湖南第一师范学院 | Method for controlling efficiency of biological oil fume purification treatment, and purification system and device thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005034726A (en) * | 2003-07-14 | 2005-02-10 | Kurita Water Ind Ltd | Deodorization method and apparatus |
| WO2011158495A1 (en) * | 2010-06-15 | 2011-12-22 | パナソニック株式会社 | Method for operation of fuel cell system |
| JP5341254B2 (en) * | 2010-06-15 | 2013-11-13 | パナソニック株式会社 | Operation method of fuel cell system |
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