JPS6228686B2 - - Google Patents
Info
- Publication number
- JPS6228686B2 JPS6228686B2 JP12142881A JP12142881A JPS6228686B2 JP S6228686 B2 JPS6228686 B2 JP S6228686B2 JP 12142881 A JP12142881 A JP 12142881A JP 12142881 A JP12142881 A JP 12142881A JP S6228686 B2 JPS6228686 B2 JP S6228686B2
- Authority
- JP
- Japan
- Prior art keywords
- deodorizing
- section
- biological treatment
- tank
- denitrification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 30
- 230000001877 deodorizing effect Effects 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 24
- 239000002351 wastewater Substances 0.000 claims description 13
- 239000010802 sludge Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 description 21
- 238000005273 aeration Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000004332 deodorization Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000006864 oxidative decomposition reaction Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- -1 Hydrogen ions Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Treating Waste Gases (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
本発明は悪臭ガスを生物処理工程によつて脱臭
する方法に関するものである。
従来、悪臭ガスの脱臭方法には、酸、アルカリ
剤、水等による吸収法、活性炭等による吸着法、
重油を燃料とした燃焼法等など種々の方法が行な
われているが、いずれも脱臭経費が多額となる問
題点がある。
本発明はこのような従来方法の問題を解消し、
簡単で経済的に脱臭できる方法を提供することを
目的とするものである。
本発明は、悪臭ガスを有機性廃水の生物処理工
程により脱臭する方法において、悪臭ガスをPH
7.1以上である前段工程に導入したのち、さらに
PH6.9以下である好気的後段工程に導入して脱臭
することを特徴とする脱臭方法である。
本発明の実施態様を図面を参照して説明する
と、第１図において廃水１は沈殿槽９からの返送
汚泥２と共に生物処理槽３内の第１脱臭部４に流
入する。この場合脱臭部４内はPH7.1以上に維持
することが必要であり、脱臭部４への前記流入液
（返送汚泥混合廃水）のPHが7.1未満のときはアル
カリ剤（NaOHなど）５を注入してPH調整を行な
いながらブロワーB1からの悪臭ガス６と気液接
触せしめてH2S、カプロン酸、メルカプタンなど
アルカリ性液で吸収される悪臭成分及び水溶性良
好なガスを吸収する。脱臭部４内の混合液は次い
で栓流状態に維持される曝気部８に流入し、ブロ
ワーB3からの空気１１の曝気によつて前記悪臭
成分及び廃水１中のBOD，NH3などが生物学的に
酸化分解される。なお、悪臭ガス６が無酸素の場
合、脱臭部４は嫌気的になるので前記悪臭成分の
吸収のみが行なわれ、酸素ガスを同伴する場合は
前記酸化分解も同時に進行する。
ここで前記「栓流」（Plug flow）なる術語につ
いて説明すると、これは「押出し流れ」とも呼ば
れるものであつて、ある時刻に着目している領域
に同時に流入した流体部分が、他の流体部分と混
合することなく、その後も一体となつて運動を続
ける流動状態をいう。これと対照的な流れは、完
全混合状態の流れである。
活性汚泥曝気槽（エアレーシヨンタンク）にお
いても、この栓流状態を維持しつつ運転すること
は特別困難ではない（例えば下水道協会誌、
VOL.12、No.131，1975、第50頁を参照）。
しかして、曝気部８におけるNH3の酸化分解
（硝化反応）の反応式は次のとおりであり、
NH4 +＋202→2H+＋NO− ３＋H2O
水素イオン（H+）が生成するため混合液のPHが
低下する。H+は硝化反応が進行するほどその濃
度が上昇し、しかも曝気部８内の液は栓流状態を
維持するので、曝気部８の後段ほどPH低下が著し
く、廃水１中のNH3濃度にもよるがPH5.0程度ま
で低下する。また、H2Sもイオウ酸化菌によつて
H2SO4に酸化されるため、混合液を酸性化する。
前記脱臭部４において吸収除去されなかつたア
ンモニア、アミン類などアルカリ性液に吸収され
ず酸性液に吸収され易い悪臭成分が残留する悪臭
ガス７はPHの低下した前記曝気部８後段の第２脱
臭部４′に流入し、前記悪臭成分が吸収、酸化分
解される。
このようにして処理された混合液は沈殿槽９に
流入して固液分離され、分離水１０は放流され沈
殿汚泥は返送汚泥２として脱臭部４に返送され
る。
なお、脱臭部４にはその上部の悪臭ガス７が大
気中に漏洩しないように遮へい用の蓋板を配備す
ること、悪臭ガス７を脱臭部４′に吹き込むには
ブロワーB2を使用することが好ましい。
次に、第２図例は生物処理槽３において硝化脱
窒素処理を行なうようにしたものである。すなわ
ち、廃水１は返送汚泥２、循環硝化液１１′と共
に嫌気的条件下にある脱窒素部１２に流入し、こ
れら流入液中のNO2及び／又はNO3は次式のよう
に脱窒素菌によつてN2ガスに還元分解されると
共に水酸イオン（OH-）が生成してPHが上昇す
る。
2NO− ２＋H2O→N2↑＋2OH-＋30
2NO− ３＋H2O→N2↑＋2OH-＋50
上式から明らかなとおり、脱窒素反応に際して
は生成する酸素を還元するための還元剤が必要で
あるが、廃水１中にBOD成分があればこれを利
用することができ、また不足分は別途還元剤１３
としてメタノール、エタノール等のアルコールを
添加すればよい。メタノールを使用した場合の反
応式は次式のとおりである。
2NO− ３＋5CH3OH→N2↑＋2OH-＋9H2O
しかして、脱窒素反応によつてBOD，NO3
（NO2）が除去されてPHが上昇した脱窒素液は脱臭
部４に流入し、悪臭ガス６中の悪臭成分の一部を
吸収する。この場合、悪臭ガス６が無酸素のとき
はこれを直接脱窒素部１２に供給してもよく、そ
の嫌気的条件を阻害することはないが、悪臭ガス
６には酸素が同伴することもあるので脱臭部４を
脱窒素部１２として兼用するのは処理操作が面倒
になるので好ましくない。
上記のとおり脱窒素液はPHが上昇しているので
脱臭部４へのアルカリ剤の添加を省略するか又は
添加量を削減することができる。以下、第１図例
と同様にして悪臭ガスの脱臭ならびに混合液中の
汚濁原因物質及び吸収悪臭成分の酸化分解が行な
われる（曝気部８では硝化反応が進行する）が、
悪臭ガス６は溶存酸素のない脱窒素液と接触する
ため該ガス中の酸素は液中に移行して悪臭ガス７
の酸素濃度が低下するので、脱臭部４′端部の混
合液は溶存酸素量が極く微量になる。したがつ
て、循環硝化液１１′を脱窒素部１２へ返送して
も実質的に、その嫌気的条件を阻害することはな
い。
なお、第３図及び第４図は第２図例を具体化し
た装置の概略を示すものであるが、悪臭ガス７を
エアリフトによる硝化液循環（循環硝化液１１′
の脱窒素部１２への返送）用に利用すれば循環ポ
ンプを省略することができる。この場合、前記し
た理由から脱窒素部１２の嫌気的条件を害するこ
とはない。なお、第３図中破線は液の流過方向を
示し、第４図中１４は散気管である。
本発明は、微生物により処理液のPHを変化させ
るとともに微生物の分解作用を利用するようにし
たものであり、このような作用を応用できる生物
処理法ならば前記した活性汚泥法、硝化脱窒素法
以外の生物処理法も適用することができる。例え
ば生物膜法（活性炭、砂などを利用）、回転円板
法、散水床法などが可能である。なお、これら
生成処理工程では処理液の流過方向に沿つてPH勾
配を設けることが好ましく、そのためには処理液
を例えば第１図例に示されるような栓流の状態に
したり、複数の工程を直接的に結合して処理すれ
ばよい。
次に本発明の実施例について記す。
実施例
し尿を水道水で10倍に希釈したものを原水（廃
水１）として第５図に示す装置によつて脱臭処理
実験を行なつた。生物処理槽３の容量は25であ
り、通水孔を開口した仕切板によつて第１（曝
気）槽３１乃至第５（曝気）槽３５を区画形成
し、第１槽３１及び第５槽３５を脱臭部とすると
共に、これら２槽には悪臭ガスの大気中への漏洩
を防止するための蓋板を設けた。
前記廃水１を貯槽１′に貯留し、空気１１を廃
水１内に曝気することによつて悪臭ガス６を発生
させ廃水１はポンプ１５により第１槽３１上部に
供給し、悪臭ガス６はブロワB1により第１槽３
１内液に曝気した。第１槽３１内の液は第２槽３
２乃至第４槽３４の順に流過せしめると共に、第
１槽３１にはアルカリ剤（NaOH）５を、第５槽
には酸（Hcl）１７をそれぞれ添加してPH調整を
行なつた。なお、第５図中５′，１５，１６及び
１７′はポンプ、ａ，ｂ及びｃはサンプリング用
コツクを示す。また、沈殿槽９の容量は８であ
り、沈殿汚泥は第１槽３１への返送汚泥２とし
た。
生物処理槽３のMLSSを7200mg／、第１槽３
１及び第５槽３５への給気量を５／minに固定
すると共に、これら両槽のPHを３水準としてPHと
脱臭効果の関係を調べた。結果を下表に示す。ま
た、PHとH2S除去率の関係を第６図に、下表のデ
ータから算出したNH3除去率とPHの関係を第７図
にそれぞれ示した。
これらの結果から第１槽３１、第５槽３５のPH
をそれぞれ7.1以上、6.9以下に調整することによ
り効果的な脱臭処理が行なえることがわかる。
The present invention relates to a method for deodorizing malodorous gas by a biological treatment process. Conventionally, deodorizing methods for malodorous gases include absorption methods using acids, alkaline agents, water, etc., adsorption methods using activated carbon, etc.
Various methods have been used, such as a combustion method using heavy oil as fuel, but all of them have the problem of high deodorization costs. The present invention solves the problems of such conventional methods,
The purpose is to provide a simple and economical method for deodorizing. The present invention provides a method for deodorizing malodorous gas through a biological treatment process of organic wastewater.
After introducing it in the first stage process that is 7.1 or higher, further
This deodorizing method is characterized by deodorizing by introducing it into an aerobic subsequent step where the pH is below 6.9. An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, wastewater 1 flows into the first deodorizing section 4 in the biological treatment tank 3 together with the returned sludge 2 from the settling tank 9. In this case, it is necessary to maintain the pH inside the deodorizing section 4 at 7.1 or higher, and if the PH of the inflow liquid (return sludge mixed wastewater) to the deodorizing section 4 is less than 7.1, an alkaline agent (such as NaOH) 5 is applied. It is injected and brought into gas-liquid contact with the malodorous gas 6 from the blower B 1 while adjusting the pH, thereby absorbing malodorous components and water-soluble gases such as H 2 S, caproic acid, and mercaptan that are absorbed by alkaline liquids. The mixed liquid in the deodorizing section 4 then flows into the aeration section 8 which is maintained in a plug flow state, and the above-mentioned malodorous components and BOD, NH 3 , etc. in the waste water 1 are removed from the living organisms by aeration of the air 11 from the blower B 3 . Chemically oxidized and decomposed. Note that when the malodorous gas 6 is oxygen-free, the deodorizing section 4 becomes anaerobic and only absorbs the malodorous components, and when oxygen gas is accompanied, the oxidative decomposition proceeds at the same time. Here, to explain the term "plug flow", it is also called "pushing flow", in which a fluid part that has simultaneously flowed into the area of interest at a certain time flows into another fluid part. A fluid state in which the fluid continues to move as one without mixing with the fluid. A contrasting flow is a fully mixed flow. Even in activated sludge aeration tanks, it is not particularly difficult to operate them while maintaining this plug flow condition (for example, see the Journal of the Japan Sewage Works Association,
(See VOL.12, No.131, 1975, page 50). Therefore, the reaction formula for the oxidative decomposition (nitrification reaction) of NH 3 in the aeration section 8 is as follows: NH 4 + +20 2 →2H + +NO − 3 +H 2 O Hydrogen ions (H + ) are generated. The pH of the mixture decreases. The concentration of H + increases as the nitrification reaction progresses, and since the liquid in the aeration section 8 maintains a plug flow state, the pH decreases more markedly at the later stages of the aeration section 8, and the concentration of NH3 in the wastewater 1 increases. Depending on the situation, the pH will drop to around 5.0. In addition, H 2 S is also oxidized by sulfur oxidizing bacteria.
It is oxidized to H 2 SO 4 and thus acidifies the mixture. The malodorous gas 7 containing residual malodorous components such as ammonia and amines that are not absorbed by alkaline liquids but easily absorbed by acidic liquids that were not absorbed and removed in the deodorizing section 4 is removed to a second deodorizing section downstream of the aeration section 8 where the pH has decreased. 4', the malodorous components are absorbed and oxidized and decomposed. The thus treated mixed liquid flows into the settling tank 9 where it is separated into solid and liquid, the separated water 10 is discharged, and the settled sludge is returned to the deodorizing section 4 as return sludge 2. Note that the deodorizing section 4 should be provided with a shielding cover plate to prevent the foul-smelling gas 7 above from leaking into the atmosphere, and a blower B 2 should be used to blow the foul-smelling gas 7 into the deodorizing section 4'. is preferred. Next, in the example shown in FIG. 2, nitrification and denitrification treatment is carried out in the biological treatment tank 3. That is, the wastewater 1 flows into the denitrification section 12 under anaerobic conditions together with the return sludge 2 and the circulating nitrification liquid 11', and NO 2 and/or NO 3 in these inflows are absorbed by denitrification bacteria as shown in the following equation. is reduced and decomposed into N 2 gas, and hydroxide ions (OH - ) are generated, increasing the pH. 2NO - 2 +H 2 O→N 2 ↑+2OH - +30 2NO - 3 +H 2 O→N 2 ↑+2OH - +50 As is clear from the above equation, a reducing agent is required to reduce the oxygen produced during the denitrification reaction. However, if there is a BOD component in wastewater 1, it can be used, and if there is a shortage, a reducing agent 13 is added separately.
Alcohol such as methanol or ethanol may be added as a solution. The reaction formula when methanol is used is as follows. 2NO − 3 +5CH 3 OH→N 2 ↑＋2OH − +9H 2 O Therefore, BOD, NO 3 are generated by the denitrification reaction.
The denitrifying liquid from which (NO 2 ) has been removed and whose pH has increased flows into the deodorizing section 4 and absorbs some of the malodorous components in the malodorous gas 6. In this case, when the malodorous gas 6 is anoxic, it may be directly supplied to the denitrification section 12 without disturbing the anaerobic conditions, but the malodorous gas 6 may be accompanied by oxygen. Therefore, it is not preferable to use the deodorizing section 4 also as the denitrifying section 12 because the processing operation becomes troublesome. As mentioned above, since the pH of the denitrifying liquid has increased, the addition of the alkaline agent to the deodorizing section 4 can be omitted or the amount added can be reduced. Thereafter, deodorization of the malodorous gas and oxidative decomposition of the pollution-causing substances and absorbed malodorous components in the mixed liquid are carried out in the same manner as in the example in FIG. 1 (the nitrification reaction proceeds in the aeration section 8).
Since the malodorous gas 6 comes into contact with the denitrification liquid without dissolved oxygen, the oxygen in the gas is transferred into the liquid and becomes the malodorous gas 7.
Since the oxygen concentration of the deodorizing section 4' decreases, the amount of dissolved oxygen in the mixed liquid at the end of the deodorizing section 4' becomes extremely small. Therefore, even if the circulating nitrification liquid 11' is returned to the denitrification section 12, the anaerobic conditions thereof are not substantially disturbed. Note that FIGS. 3 and 4 schematically show an apparatus embodying the example in FIG.
(return to the denitrification section 12), the circulation pump can be omitted. In this case, for the reasons mentioned above, the anaerobic conditions of the denitrification section 12 are not impaired. In addition, the broken line in FIG. 3 shows the flow direction of the liquid, and 14 in FIG. 4 is an aeration pipe. The present invention uses microorganisms to change the PH of the treated solution and utilizes the decomposition action of microorganisms.Biological treatment methods that can apply such action include the activated sludge method and nitrification-denitrification method described above. Other biological treatment methods can also be applied. For example, the biofilm method (using activated carbon, sand, etc.), rotating disk method, sprinkled bed method, etc. are possible. In addition, in these generation processing steps, it is preferable to provide a PH gradient along the flow direction of the processing liquid, and for this purpose, for example, the processing liquid is brought into a plug flow state as shown in the example in Fig. 1, or multiple steps are performed. can be directly combined and processed. Next, examples of the present invention will be described. Example A deodorization experiment was conducted using human waste diluted 10 times with tap water as raw water (wastewater 1) using the apparatus shown in FIG. The capacity of the biological treatment tank 3 is 25, and the first (aeration) tank 3 1 to the fifth (aeration) tank 3 5 are divided by partition plates with water holes. The fifth tank 35 was used as a deodorizing section, and these two tanks were provided with lid plates to prevent malodorous gas from leaking into the atmosphere. The wastewater 1 is stored in a storage tank 1', and by aerating air 11 into the wastewater 1, a foul-smelling gas 6 is generated.The wastewater 1 is supplied to the upper part of the first tank 31 by a pump 15, and the foul-smelling gas 6 is 1st tank 3 by blower B 1
1. The internal solution was aerated. The liquid in the first tank 3 1 is transferred to the second tank 3.
The water was allowed to flow through tanks 2 to 4 in the order of 3 and 4 , and pH was adjusted by adding 5 of an alkali agent (NaOH) to the first tank 3 and 1 of acid (Hcl) to the 5th tank. . In FIG. 5, 5', 15, 16, and 17' are pumps, and a, b, and c are sampling pots. The capacity of the settling tank 9 was 8, and the settled sludge was returned to the first tank 31 as sludge 2. 7200mg/MLSS in biological treatment tank 3, 1st tank 3
The relationship between PH and deodorizing effect was investigated by fixing the amount of air supplied to the 1st and 5th tanks 35 at 5/min and setting the PH of both tanks to 3 levels. The results are shown in the table below. Furthermore, the relationship between PH and H 2 S removal rate is shown in Figure 6, and the relationship between NH 3 removal rate and PH calculated from the data in the table below is shown in Figure 7. From these results, the pH of the first tank 3 1 and the 5th tank 3 5
It can be seen that effective deodorization can be performed by adjusting the values to 7.1 or higher and 6.9 or lower, respectively.
【表】
以上述べたように本発明によれば、簡便な操
作、簡単な装置により適確に脱臭処理が行なえる
うえ、薬剤使用量は少量ですむので極めて省エネ
ルギー的かつ経済的となるなどの利益が得られ
る。[Table] As described above, according to the present invention, deodorization can be performed accurately with simple operation and a simple device, and the amount of chemicals used is small, making it extremely energy-saving and economical. Profit can be obtained.
第１図及び第２図は本発明の各実施態様を示す
系統説明図、第３図は第２図例を具体化した装置
の概略平面図、第４図は第３図−線による断
面図、第５図は本発明の実施例に使用した装置の
系統説明図であり第６図、第７図は本発明の実施
例の結果を示すグラフである。
１……廃水、２……返送汚泥、３……生物処理
槽、４，４′……脱臭部、５……アルカリ剤、
６，７……悪臭ガス、８……曝気部、９……沈殿
槽、１０……分離水、１１……空気、１１′……
循環硝化液、１２……脱窒素部、１３……還元
剤、１４……散気管、５′，１５，１６，１７′…
…ポンプ、１７……酸、B1〜B3……ブロワー。
1 and 2 are system explanatory diagrams showing each embodiment of the present invention, FIG. 3 is a schematic plan view of a device embodying the example in FIG. 2, and FIG. 4 is a sectional view taken along the line of FIG. 3. , FIG. 5 is an explanatory diagram of the system of the apparatus used in the embodiment of the present invention, and FIGS. 6 and 7 are graphs showing the results of the embodiment of the present invention. 1...Wastewater, 2...Return sludge, 3...Biological treatment tank, 4, 4'...Deodorizing section, 5...Alkaline agent,
6, 7...Odor gas, 8...Aeration section, 9...Sedimentation tank, 10...Separated water, 11...Air, 11'...
Circulating nitrification liquid, 12... Denitrification section, 13... Reducing agent, 14... Diffusion pipe, 5', 15, 16, 17'...
...Pump, 17...Acid, B1 to B3 ...Blower.
Claims (1)
脱臭する方法において、悪臭ガスをPH7.1以上で
ある前段工程に導入したのち、さらにPH6.9以下
である好気的後段工程に導入して脱臭することを
特徴とする脱臭方法。 ２ 前記生物処理工程が硝化脱窒素法によるもの
である特許請求の範囲第１項記載の方法。 ３ 前記前段工程が脱窒素工程である特許請求の
範囲第２項記載の方法。 ４ 前記生物処理工程が活性汚泥法又は生物膜法
によるものである特許請求の範囲第１項記載の方
法。 ５ 前記前段工程、後段工程のうち少なくとも前
段工程がその処理液を外気と遮断して行なわれる
ものである特許請求の範囲第１項、第２項、第３
項又は第４項記載の方法。 ６ 前記生物処理工程が処理液を栓流状態にして
又は複数の工程を直列的に結合して行なわれるも
のである特許請求の範囲第１項、第２項、第３
項、第４項又は第５項記載の方法。[Scope of Claims] 1. In a method for deodorizing a malodorous gas by a biological treatment process of organic wastewater, the malodorous gas is introduced into a first step having a pH of 7.1 or higher, and then an aerobic second stage having a pH of 6.9 or lower. A deodorizing method characterized by introducing it into a process to deodorize. 2. The method according to claim 1, wherein the biological treatment step is based on a nitrification and denitrification method. 3. The method according to claim 2, wherein the first step is a denitrification step. 4. The method according to claim 1, wherein the biological treatment step is based on an activated sludge method or a biofilm method. 5. Claims 1, 2, and 3, wherein at least the first step of the first step and the second step is performed with the processing liquid isolated from the outside air.
or the method described in paragraph 4. 6. Claims 1, 2, and 3, wherein the biological treatment step is carried out by putting the treatment liquid in a plug flow state or by connecting a plurality of steps in series.
4. The method according to paragraph 4 or paragraph 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56121428A JPS5824394A (en) | 1981-08-04 | 1981-08-04 | Deodorizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56121428A JPS5824394A (en) | 1981-08-04 | 1981-08-04 | Deodorizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5824394A JPS5824394A (en) | 1983-02-14 |
| JPS6228686B2 true JPS6228686B2 (en) | 1987-06-22 |
Family
ID=14810896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56121428A Granted JPS5824394A (en) | 1981-08-04 | 1981-08-04 | Deodorizing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5824394A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827619A (en) * | 1981-08-07 | 1983-02-18 | Ebara Infilco Co Ltd | Deodorizing method |
| US4894162A (en) * | 1988-04-27 | 1990-01-16 | Ciba-Geigy Corporation | Treatment of volatile organic substances at waste water treatment plants |
| US5106496A (en) * | 1988-04-27 | 1992-04-21 | Ciba-Geigy Corporation | Treatment of volatile organic substances at waste water treatment plants |
-
1981
- 1981-08-04 JP JP56121428A patent/JPS5824394A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5824394A (en) | 1983-02-14 |
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