JPH03242222A - Filter bed-type biological deodorizer - Google Patents

【発明の詳細な説明】 産業上の利用分野 本発明は下水処理場や各種工場などにおいて発生する複
合臭気を除去する脱臭設備として用いるる床式生物脱臭
装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a floor-type biological deodorizing device used as deodorizing equipment for removing complex odors generated in sewage treatment plants and various factories.

従来の技術 第２図は従来のろ床式生物脱臭装置の構成図である。第
２図において、生物脱臭塔１の内部にはる床部２が設け
られており、ろ床部２に脱臭に関与する微生物が固定さ
れている。このろ床部２の下方から供給される臭気を有
する原ガス３はろ床部２を通過する間に微生物によって
脱臭されて、生物脱臭塔１の上部から処理ガス４として
脱臭ファン５によって取り出される。また、生物脱臭塔
１の下部には循環水槽６が形成され、この循環水槽６の
循環水７は、散水ポンプ８によって、ろ床部２の上方に
設けられた散水管９がら散水されて、ろ床部２への水分
補給が行われるとともに、微生物によって分解されてろ
床部２に滞留する反応生成物（硫酸イオン、硝酸イオン
など）が洗浄され、循環水槽６に流下する。そして、反
応生成物を含んだ循環水７は、循環水槽６に供給される
中和剤（苛性ソーダなど）１０によって中和され、再び
散水管９から散水される。１１は循環水槽６に補給され
る補給水である。BACKGROUND OF THE INVENTION FIG. 2 is a block diagram of a conventional filter bed type biological deodorizing device. In FIG. 2, a filter bed section 2 is provided inside the biological deodorization tower 1, and microorganisms involved in deodorization are immobilized on the filter bed section 2. The raw gas 3 having an odor supplied from below the filter bed section 2 is deodorized by microorganisms while passing through the filter bed section 2, and is taken out from the upper part of the biological deodorization tower 1 as a treated gas 4 by a deodorizing fan 5. Further, a circulating water tank 6 is formed in the lower part of the biological deodorizing tower 1, and the circulating water 7 of this circulating water tank 6 is sprinkled by a watering pump 8 through a watering pipe 9 provided above the filter bed section 2. Water is supplied to the filter bed section 2, and reaction products (sulfate ions, nitrate ions, etc.) that are decomposed by microorganisms and remain in the filter bed section 2 are washed and flowed down into the circulating water tank 6. The circulating water 7 containing the reaction product is neutralized by a neutralizing agent (such as caustic soda) 10 supplied to the circulating water tank 6, and is again sprayed from the water sprinkling pipe 9. Reference numeral 11 indicates makeup water to be supplied to the circulating water tank 6.

発明が解決しようとする課題 上記従来のる床武生物脱臭装！では、原ガス３中の難溶
解性臭気成分は、水中への溶解が律速されるため原ガス
３の通常ガス濃度から高ガス濃度に上昇した場合には、
特に難溶解性の臭気物質は処理しきれず、負荷変動に弱
いという問題を有していた。Problems to be solved by the invention The above-mentioned conventional Rutoko martial arts deodorizer! Then, since the rate of dissolution of the poorly soluble odor components in the raw gas 3 into water is limited, when the gas concentration of the raw gas 3 rises from the normal gas concentration to a high gas concentration,
In particular, it has been difficult to treat poorly soluble odorous substances and is susceptible to load fluctuations.

本発明は上記従来の問題を解決するもので、難溶解性臭
気成分の除去性能を向上させて、原ガスが通常濃度から
高濃度に上昇した場合にも対処し得る、負荷変動に強い
ろ床式生物脱臭装置を提供することを目的とするもので
ある。The present invention solves the above-mentioned conventional problems.The present invention improves the removal performance of hardly soluble odor components, and makes it possible to cope with the case where the raw gas concentration increases from normal to high concentration, and is resistant to load fluctuations. The purpose of this invention is to provide a type biological deodorizing device.

課題を解決するための手段 上記課題を解決するために本発明のろ床式生物脱臭装置
は、脱臭に関与する微生物を固定したろ床部の下方に設
けられた循環水槽に前記ろ床部から流下した微生物を含
む散水液を用いて前記ろ床部に散水し、前記ろ床部に原
ガスを供給して前記原ガスの臭気成分を分解除去するろ
床式生物脱臭装置において、前記循環水槽の微生物混合
液内に前記微生物混合液をろ過して膜透過液を得るろ遣
手段を設け、前記ろ遣手段の下方位置に、前記循環水槽
の微生物混合液を曝気する曝気手段を設け、前記ろ床部
を、前記膜透過液を間欠散水する前段ろ床部と、前記微
生物混合液を連続散水する後段ろ床部とで構成したこと
を特徴とするものである。Means for Solving the Problems In order to solve the above problems, the filter bed type biological deodorizing device of the present invention has a filter bed type biological deodorizing device in which microorganisms involved in deodorization are immobilized. In the filter bed type biological deodorizing device, the filter bed section is sprayed with water using a watering solution containing flowing down microorganisms, raw gas is supplied to the filter bed section, and odor components of the raw gas are decomposed and removed, wherein the circulating water tank A filtration means for filtering the microbial mixture to obtain a membrane-permeated liquid is provided in the microbial mixture, and an aeration means for aerating the microbial mixture in the circulating water tank is provided below the filtration means. The filter bed section is characterized by comprising a front-stage filter bed section for intermittently sprinkling the membrane-permeated liquid, and a rear-stage filter bed section for continuously sprinkling the microbial mixture.

作用 上記構成により、前段ろ床部では、微生物混合液の膜透
過液が間欠散水され、原ガスが供給されて易溶解性臭気
成分に適合した微生物が多くｇ養され、易溶解性臭気成
分とｉｔ溶解性臭気成分の一部とが分解除去される。ま
た、後段ろ床部では微生物混合液が連続散水されて原ガ
スのＨ溶解性臭気成分が溶は込む溶媒量を多くして溶は
込み易くするとともに、難溶解性臭気成分に適合した微
生物か多く馴養され、前段ろ床部で分解除去されなかっ
た難溶解性臭気成分が効果的に分解除去されることにな
る。さらに、循環水槽内の微生物混合液に曝気して酸素
を供給し、循環水槽内でも難溶解性臭気成分の分解除去
反応が進行する。したがって、除去されにくい難溶解性
臭気成分の除去性能の向上により、原ガスの通常濃度か
ら高濃度への多少の負荷変動に対しても充分対処し得る
、負荷変動に強いろ床式生物脱臭装置が得られることに
なる。Effect With the above structure, in the front stage filter bed part, the membrane-permeated liquid of the microbial mixture is intermittently sprinkled, the raw gas is supplied, and a large number of microorganisms that are compatible with easily soluble odor components are cultivated, and the microorganisms that are compatible with easily soluble odor components are cultivated. Some of the soluble odor components are decomposed and removed. In addition, a microorganism mixture is continuously sprinkled in the latter stage filter bed to increase the amount of solvent into which the H-soluble odor components of the raw gas are dissolved, making it easier for the solution to be incorporated, and also to increase the amount of the solvent that is compatible with the poorly soluble odor components. The poorly soluble odor components that were not decomposed and removed in the pre-stage filter bed are effectively decomposed and removed. Further, the microbial mixture in the circulating water tank is aerated and oxygen is supplied, so that the decomposition and removal reaction of the hardly soluble odor components proceeds in the circulating water tank as well. Therefore, the filter bed type biological deodorizer is resistant to load fluctuations and can sufficiently cope with slight load fluctuations from the normal concentration of raw gas to high concentration by improving the removal performance of poorly soluble odor components that are difficult to remove. will be obtained.

また、ろ遣手段の下方位置で曝気手段により曝気するの
で、ろ遣手段の目づまりなど、汚染が防止される。Furthermore, since aeration is performed by the aeration means at a position below the filtration means, contamination such as clogging of the filtration means is prevented.

実権例 以下、本発明の一実施例について図面を参照しながら説
明する。EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

第１図は本発明の一実施例を示する床式生物脱臭装置の
構成図であり、従来例と同一の作用効果を奏するものに
は同一の符号を付してその説明を省略する。第１図にお
いて、生物脱臭塔２１の内部には前段と後段に分かれて
ろ床部２２．２３が設けられており、これらろ床部２２
．２３は多孔質のセラミック担体で形成されている。ま
た、これらろ床部２２、２３には微生物が固定されてお
り、微生物は生物脱臭塔２１に供給される原ガス３に応
じてｒｉＡ！され、原ガス３に適宜に適合する。FIG. 1 is a block diagram of a floor-type biological deodorizing apparatus showing an embodiment of the present invention, and parts having the same functions and effects as those of the conventional example are given the same reference numerals, and the explanation thereof will be omitted. In FIG. 1, inside the biological deodorizing tower 21, filter bed sections 22 and 23 are provided which are divided into a front stage and a rear stage.
．． 23 is made of a porous ceramic carrier. In addition, microorganisms are immobilized on these filter beds 22 and 23, and the microorganisms react to riA! according to the raw gas 3 supplied to the biological deodorization tower 21. and suitably match the raw gas 3.

また、生物脱臭塔２１の下部には循環水槽６が形成され
ており、この循環水槽６の循環水である微生物混合液７
内に垂下された管は散水ポンプ８を介して前段ろ床部２
２と後段ろ床部２３の間に介装された散気管２４に連通
している。さらに、循環水槽６の微生物混合液７内にろ
過ＷＡ２５が設けられ、ろ過膜２５の膜透過液側２５ａ
は散水ボンダ２６を介して前段ろ床部２２の上方に設け
られた散水管２７に連通している。Further, a circulating water tank 6 is formed in the lower part of the biological deodorizing tower 21, and a microbial mixture liquid 7, which is the circulating water of this circulating water tank 6, is formed in the lower part of the biological deodorizing tower 21.
The pipe suspended inside is connected to the front filter bed section 2 via a sprinkler pump 8.
It communicates with an aeration pipe 24 interposed between the air filter 2 and the rear filter bed section 23. Furthermore, a filtration WA 25 is provided in the microbial mixture 7 of the circulating water tank 6, and a membrane permeate side 25a of the filtration membrane 25 is provided.
is in communication with a water sprinkling pipe 27 provided above the front filter bed portion 22 via a water sprinkling bonder 26 .

また、原ガス３を生物脱臭塔２１の最上部から、前段ろ
床部、さらに、後段ろ床部２３を通して送風し、後段ろ
床部２３の下部から処理ガス２８として取り出すように
構成されている。Further, the raw gas 3 is blown from the top of the biological deodorizing tower 21 through the front filter bed section and further through the rear filter bed section 23, and is taken out as the treated gas 28 from the lower part of the rear filter bed section 23. .

さらに、循環水槽６の微生物混合液７内に設けられたろ
過膜２５の上方位１に散気管２９が設けられ、処理ガス
２８が取り出される管は散気ポンプ３０を介して散気管
２９に連通し、散気ポンプ３０により処理ガス２８を微
生物混合液７に曝気する。Furthermore, an aeration pipe 29 is provided above the filtration membrane 25 provided in the microbial mixture 7 of the circulating water tank 6, and the pipe from which the treated gas 28 is taken out communicates with the aeration pipe 29 via an aeration pump 30. Then, the microorganism mixture 7 is aerated with the processing gas 28 by the aeration pump 30.

上記構成により、以下、その動作を説明する。The operation of the above configuration will be explained below.

まず、循環水槽６の微生物混合液７内に設けられたろ過
膜２５を通して、散水ポンプ２６の吸引により微生物混
合液７がろ過されて膜透過液が得られる。膜透過液は散
水ポンプ２６を介して散水管２７から、前段ろ床部２２
に対して間欠的に散水される。First, the microbial mixture 7 is filtered through the filtration membrane 25 provided in the microbial mixture 7 of the circulating water tank 6 by suction from the sprinkler pump 26 to obtain a membrane-permeated liquid. The membrane permeate is passed from the sprinkler pipe 27 via the sprinkler pump 26 to the front filter bed section 22.
water is sprinkled intermittently.

また、原ガス３は、生物脱臭塔２１の最上部より、まず
、前段ろ床部２２に送風され、原ガス３の通過にともな
って、前段ろ床部２２に易溶解性の臭気成分（硫化水素
など）と一部のＲ溶解性の臭気成分（メチルカプタン、
硫化メチル、二硫化メチルなど）が除去される。これに
より、前段のる床部にはそれに適した微生物が多く馴養
されることになる。The raw gas 3 is first blown from the top of the biological deodorizing tower 21 to the front filter bed 22, and as the raw gas 3 passes through the front filter bed 22, easily soluble odor components (sulfide hydrogen, etc.) and some R-soluble odor components (methylcaptan,
methyl sulfide, methyl disulfide, etc.) are removed. As a result, the floor section on which the front stage rests will be acclimatized with many suitable microorganisms.

次に、後段ろ床部２３には、微生物混合液７が散水ポン
プ８により連続散水されるため、後段ろ床部２３では、
難溶解性臭気成分が溶は込む溶媒量を多くすることがで
き、溶は込み易い状態かつくられる。このようにして後
段ろ床部２３に主に難溶解性の臭気成分が供給されるこ
とになり、それに適した、微生物が多く馴養されること
になる。以上により、難溶解性臭気成分の除去性能は向
上する。Next, the microbial mixture 7 is continuously sprinkled on the rear filter bed section 23 by the watering pump 8, so that in the rear filter bed section 23,
The amount of solvent into which poorly soluble odor components are dissolved can be increased, and a state is created in which the solvent is easily absorbed. In this way, hardly soluble odor components are mainly supplied to the rear filter bed section 23, and many suitable microorganisms are acclimatized thereto. As a result of the above, the removal performance of hardly soluble odor components is improved.

したがって、生物脱臭塔２１の最上部より供給された複
合臭気成分を含む原ガス３は、前段ろ床部２２で、易溶
解性の臭気成分と難溶解性の臭気成分の一部がそれに適
した微生物によって分解除去される。さらに、前段ろ床
部２２で除去できなかった難溶解性臭気成分は、後段ろ
床部でそれに適した微生物により効率的に分解除去され
る。Therefore, the raw gas 3 containing complex odor components supplied from the top of the biological deodorization tower 21 is processed in the pre-stage filter bed section 22 so that some of the easily soluble odor components and the slightly soluble odor components are removed. Decomposed and removed by microorganisms. Furthermore, the hardly soluble odor components that could not be removed in the front filter bed section 22 are efficiently decomposed and removed by suitable microorganisms in the rear filter bed section.

さらに、前段ろ床部２２および後段ろ床部２３への散水
液は、それぞれ循環水槽６内の微生物混合液７および微
生物混合液７からろ過された膜透過液が用いられており
、難溶解性の臭気成分の分解反応は、難溶解性臭気成分
が微生物混合液７に溶けて循環水槽６内でも進行する。Furthermore, the water spraying liquid to the front filter bed section 22 and the rear filter bed section 23 uses membrane permeate liquid filtered from the microbial mixed liquid 7 and the microbial mixed liquid 7 in the circulating water tank 6, respectively. The decomposition reaction of the odor components proceeds in the circulating water tank 6 as the hardly soluble odor components are dissolved in the microbial mixture 7.

このため、循環水槽６の微生物混合液７内に処理ガス２
８や空気などで曝気すれば、微生物混合液７へ酸素が供
給され、臭気成分の除去性能の向上が期待できる。また
、ろ過膜２５の膜面に向かって曝気されているので、膜
面の目づまり等、汚染防止も行われる。For this reason, the treated gas 2 is contained in the microbial mixture 7 of the circulating water tank 6.
If aerated with 8 or air, oxygen will be supplied to the microbial mixture 7, and an improvement in the odor component removal performance can be expected. Furthermore, since aeration is carried out toward the membrane surface of the filtration membrane 25, contamination such as clogging of the membrane surface is also prevented.

以上のように、溶解しにくいために除去されにくい難溶
解性臭気成分は、まず前段ろ床部２２でその一部が除去
された後、残りの難溶解性臭気成分はその除去性能の高
い後段ろ床部２３で効果的に分解除去され、さらに、循
環水槽６内の微生物混合液７に酸素を供給して循環水槽
６内でも難溶解性臭気成分の分解反応を進行させること
ができるので、原ガス３の通常濃度から高濃度への多少
の負荷変動に対しても残らず処理することができるもの
である。As described above, the poorly soluble odor components that are difficult to remove because they are difficult to dissolve are first partially removed in the front stage filter bed section 22, and then the remaining poorly soluble odor components are removed in the rear stage where the removal performance is high. Since it is effectively decomposed and removed in the filter bed section 23, and oxygen is supplied to the microbial mixture 7 in the circulating water tank 6, the decomposition reaction of the hardly soluble odor components can proceed in the circulating water tank 6 as well. It is possible to completely process even a slight change in the load of the raw gas 3 from a normal concentration to a high concentration.

なお、後段ろ床部２３は担体の充填層の代わりにモレタ
ナを用いてもよい。Incidentally, in the rear stage filter bed section 23, moretana may be used instead of the packed bed of carrier.

発明の効果 以上のように本発明によれば、原ガスの易溶解性臭気成
分と一部の難溶解性の臭気成分が前段ろ床部で分解除去
された後、残りの！溶解性臭気成分は、後段ろ床部で、
難溶解性臭気成分を溶は込み易い状態にするとともに、
それに適合した微生物を多く馴養して、効果的に分解除
去され、さらに、循環水槽内の微生物混合液に曝気して
循環水槽内でも難溶解性臭気成分の分解反応を進行させ
るため、除去されにくい難溶解性臭気成分の除去性能を
向上させることができ、原ガスの通常濃度から高濃度へ
の多少の負荷変動に対しても充分対処することができる
ものである。Effects of the Invention As described above, according to the present invention, after the easily soluble odor components and some of the hardly soluble odor components of the raw gas are decomposed and removed in the front stage filter bed, the remaining ! Soluble odor components are removed at the rear filter bed.
In addition to making the hardly soluble odor components more easily dissolved,
It is effectively decomposed and removed by acclimatizing many suitable microorganisms, and it is also difficult to remove because the microbial mixture in the circulating tank is aerated and the decomposition reaction of poorly soluble odor components progresses even in the circulating tank. It is possible to improve the removal performance of hardly soluble odor components, and it is possible to sufficiently cope with some load fluctuations from the normal concentration of the raw gas to the high concentration.

また、ろ過手段の上方位１で曝気手段により曝気するた
め、ろ過手段の目づまりなど、汚染を防止することがで
きるものである。Furthermore, since aeration is performed by the aeration means above the filtration means, contamination such as clogging of the filtration means can be prevented.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の一実施例を示する床式生物脱臭装置の
構成図、第２図は従来のろ床式脱臭装置の構成図である
。 ７・・・微生物混合液、８，２６・・・散水ポンプ、２
２・・・前段ろ床部、２３・・・後段ろ床部、２４．２
７・・・散水管、２５・・・ろ過膜、２９・・・散気管
、３０・・・散気ポンプ。FIG. 1 is a block diagram of a bed type biological deodorizing apparatus showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional filter bed type deodorizing apparatus. 7... Microbial mixture, 8, 26... Water pump, 2
2... Front filter floor section, 23... Rear filter floor section, 24.2
7... Water sprinkler pipe, 25... Filtration membrane, 29... Air diffuser pipe, 30... Air diffuser pump.