JPS6017596B2 - Method for suppressing nitrification reaction in aerobic activated sludge treatment - Google Patents
Method for suppressing nitrification reaction in aerobic activated sludge treatmentInfo
- Publication number
- JPS6017596B2 JPS6017596B2 JP53060444A JP6044478A JPS6017596B2 JP S6017596 B2 JPS6017596 B2 JP S6017596B2 JP 53060444 A JP53060444 A JP 53060444A JP 6044478 A JP6044478 A JP 6044478A JP S6017596 B2 JPS6017596 B2 JP S6017596B2
- Authority
- JP
- Japan
- Prior art keywords
- activated sludge
- orp
- tank
- sludge treatment
- amount
- 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
- 239000010802 sludge Substances 0.000 title claims description 55
- 238000000034 method Methods 0.000 title claims description 22
- 238000006243 chemical reaction Methods 0.000 title claims description 16
- 238000005273 aeration Methods 0.000 claims description 17
- 239000002957 persistent organic pollutant Substances 0.000 claims description 16
- 239000002351 wastewater Substances 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical class N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 11
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 claims description 6
- -1 ammonia compound Chemical class 0.000 claims description 3
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 229910021607 Silver chloride Inorganic materials 0.000 claims 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 60
- 241000894006 Bacteria Species 0.000 description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000000354 decomposition reaction Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 7
- 239000003344 environmental pollutant Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000001546 nitrifying effect Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- NJYFRQQXXXRJHK-UHFFFAOYSA-N (4-aminophenyl) thiocyanate Chemical class NC1=CC=C(SC#N)C=C1 NJYFRQQXXXRJHK-UHFFFAOYSA-N 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- OSFPMGUDCNCPJJ-UHFFFAOYSA-M chlorosilver gold Chemical compound [Au].[Ag]Cl OSFPMGUDCNCPJJ-UHFFFAOYSA-M 0.000 description 2
- 229930003836 cresol Natural products 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 150000002823 nitrates Chemical class 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 241000207199 Citrus Species 0.000 description 1
- 101000992392 Homo sapiens Oxysterol-binding protein-related protein 6 Proteins 0.000 description 1
- 102100032149 Oxysterol-binding protein-related protein 6 Human genes 0.000 description 1
- 241000218998 Salicaceae Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 235000020971 citrus fruits Nutrition 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 210000000115 thoracic cavity Anatomy 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
- 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
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【発明の詳細な説明】
本発明は、有機性汚濁物質及びアンモニア化合物が共存
する排水を好気性活性汚泥処理（以下活性汚泥処理Ｔに
より有機性汚濁物質を除去処理するにあたり、曝気槽の
酸化還元電位を制御する事により、曝気槽におけるアン
モニア化合物の硝酸化合物及び又は亜硝酸化合物への酸
化を抑制して、有機性汚濁物の除去処理を円滑に行なう
方法である。Detailed Description of the Invention The present invention provides a method for removing organic pollutants by aerobic activated sludge treatment (hereinafter referred to as activated sludge treatment T) from wastewater in which organic pollutants and ammonia compounds coexist. This method suppresses the oxidation of ammonia compounds to nitrate compounds and/or nitrite compounds in the aeration tank by controlling the electric potential, thereby smoothly performing the removal process of organic pollutants.
都市下水、し尿、工場排水等に含まれている有機性汚濁
物質を除去するため活性汚泥処理が普遍的方法になって
いる。Activated sludge treatment has become a universal method for removing organic pollutants contained in urban sewage, human waste, industrial wastewater, etc.
このような排水の活性汚泥処理の場合、バクテリャの集
合体である活性汚泥には、有機性汚濁物質を分解するバ
クテリヤ（以下ＢＯＤ資化菌）の他に、アンモニア化合
物を硲酸化合物及び又は亜硝酸化合物等の窒素酸化物に
酸化する硝化菌或いは嫌気性条件で前記窒素酸化物を還
元する通性脱窒菌等が共存している。このように活性汚
泥は、種々の機能を持ったバクテリャの集合体のため、
排水中に有機性汚濁物質の他にアンモニア化合物が共存
していると、活性汚泥処理の条件によってはアンモニア
化合物が硝化菌の作用により窒素酸化物に酸化される。
これらの窒素酸化物は活性汚泥処理に対して著しく悪影
響する。即ち、活性汚泥処理の曝気槽に亜硝酸化合物が
生成すると、ＢＯＤ質化菌の機能を阻害するため、有機
性汚濁物質の除去性が低下し、処理水質が悪化する。更
に窒素酸化物が生成すると鰻気槽内のｐＨが低下し、バ
クテリャが活動するのに不適当な軸になり活性汚泥の機
能が低下する事もある。また、窒素酸化物の生成はバク
テリャの機能を阻害するだけではなく別の問題もある。In the case of activated sludge treatment of such wastewater, activated sludge, which is an aggregate of bacteria, contains not only bacteria that decompose organic pollutants (hereinafter referred to as BOD assimilating bacteria) but also ammonia compounds, silicic acid compounds, and/or Nitrifying bacteria that oxidize to nitrogen oxides such as nitrate compounds and facultative denitrifying bacteria that reduce nitrogen oxides under anaerobic conditions coexist. In this way, activated sludge is a collection of bacteria with various functions.
When ammonia compounds coexist in wastewater in addition to organic pollutants, depending on the conditions of activated sludge treatment, the ammonia compounds are oxidized to nitrogen oxides by the action of nitrifying bacteria.
These nitrogen oxides have a significant negative effect on activated sludge treatment. That is, when a nitrous acid compound is generated in an aeration tank for activated sludge treatment, it inhibits the function of BOD-improving bacteria, reducing the ability to remove organic pollutants and deteriorating the quality of treated water. Furthermore, when nitrogen oxides are produced, the pH in the eel tank decreases, making it an unsuitable axis for bacterial activity, and the function of the activated sludge may deteriorate. Furthermore, the production of nitrogen oxides not only inhibits bacterial function, but also poses other problems.
即ち、鰻気槽で生成した窒素酸化物は、汚泥沈降槽が嫌
気性のため脱窒菌の作用により窒素ガスに還元される。
この窒素ガスが活性汚泥に付着するため、汚泥沈降糟に
おいて汚泥の浮上が起り汚泥が流出し、処理水の浮遊物
質が増加する。この汚泥浮上流出により、汚泥三沈降槽
より暖気槽への返送汚泥濃度が低下し、このため曝気槽
の汚泥濃度が著しく低下する。That is, the nitrogen oxides produced in the eel tank are reduced to nitrogen gas by the action of denitrifying bacteria since the sludge settling tank is anaerobic.
Since this nitrogen gas adheres to the activated sludge, the sludge floats up in the sludge settling basin, the sludge flows out, and the amount of suspended solids in the treated water increases. Due to this sludge floating and flowing out, the concentration of sludge returned from the sludge settling tank to the warming tank decreases, and therefore the sludge concentration in the aeration tank decreases significantly.
したがって活性汚泥単位量当りの汚濁物質の負荷量が増
大し、更に活性汚泥の機能を低下させる原因となる。こ
のため、活性汚泥処理においては暖気槽の硝化反応を抑
制する方法として、溶存酸素量を管理したり或いは薬品
を添加したりしているが、これらの方法には多くの問題
点がある。Therefore, the load amount of pollutants per unit amount of activated sludge increases, which causes further deterioration of the function of activated sludge. For this reason, in activated sludge treatment, methods for suppressing the nitrification reaction in the warm air tank include controlling the amount of dissolved oxygen or adding chemicals, but these methods have many problems.
まず、蟻気槽の溶存酸素濃度を調節する方法について説
明する。First, a method for adjusting the dissolved oxygen concentration in the ant tank will be explained.
好気性活性汚泥処理による排水中の有機性汚濁物質の分
解は、酸化反応で、バクテリャが溶存酸素を利用して分
解する。この事から、活性汚泥処理の管理方法として用
いられている熔存酸素濃度の測定は、飽和溶存酸素濃度
からバクテリャの利用した酸素を除いた残存酸素量を測
定している可能性がある。このため、８０Ｄ資化菌以外
に溶存酸素を利用するバクテリャ、例えば硝化菌等が共
存していれば、硝化菌も溶存酸素を利用してアンモニア
を酸化して窒素酸化物を形成する。発明者等の研究によ
ると有機性汚濁物質とアンモニア化合物が共存する排水
を活性汚泥法で処理した場合、爆気糟と溶存酸素濃度と
窒素酸化物の生成量との間には一定の関係がなく、した
がって蟻気槽、溶存酸素濃度は硝化反応抑制の指標には
ならない事が明らかになった。The decomposition of organic pollutants in wastewater through aerobic activated sludge treatment is an oxidation reaction in which bacteria use dissolved oxygen to decompose the organic pollutants. From this, it is possible that the measurement of dissolved oxygen concentration, which is used as a control method for activated sludge treatment, measures the amount of residual oxygen after removing the oxygen used by bacteria from the saturated dissolved oxygen concentration. Therefore, if bacteria that utilize dissolved oxygen, such as nitrifying bacteria, coexist in addition to 80D assimilating bacteria, the nitrifying bacteria will also utilize dissolved oxygen to oxidize ammonia and form nitrogen oxides. According to research conducted by the inventors, when wastewater containing organic pollutants and ammonia compounds is treated using the activated sludge method, there is a certain relationship between the concentration of dissolved oxygen and the amount of nitrogen oxides produced. Therefore, it became clear that the ant gas tank and dissolved oxygen concentration were not indicators of nitrification reaction suppression.
一般に硝化反応の抑制法としては、曝気槽における窒素
酸化物の生成量の測定、汚泥沈降槽での汚泥浮上性の勧
察等を行なって陽気槽を管理している。In general, methods for suppressing nitrification reactions include measuring the amount of nitrogen oxides produced in the aeration tank, and inspecting sludge flotation in the sludge settling tank to manage the aerated tank.
したがって、従来の方法は硝化反応を事前に抑制する方
法ではなく、硝化反応が発生してからアクションを取る
後追い抑制方法である。また、窒素酸化物の生成を恐れ
るあまり最初から曝気槽を抑えると、硝化反応は抑制で
きても、ＢＯＤ資化菌の酸素量が不足しＢＯＤ簿化菌の
機能を低下させる事になる。これらの事から活性汚泥処
理の硝化反応抑制方法として溶存酸素濃度、蟻気糟を管
理する方法は根本的な抑制方法とは云い難い。Therefore, the conventional method is not a method of suppressing the nitrification reaction in advance, but a follow-up suppression method of taking action after the nitrification reaction occurs. Furthermore, if the aeration tank is suppressed from the beginning out of fear of the production of nitrogen oxides, even if the nitrification reaction can be suppressed, the amount of oxygen for the BOD assimilating bacteria will become insufficient and the function of the BOD assimilating bacteria will deteriorate. For these reasons, it is difficult to say that the method of controlling dissolved oxygen concentration and ant scale as a method of suppressing the nitrification reaction in activated sludge treatment is a fundamental method of suppression.
また、硝化反応を抑制する薬品が販売されているが多量
の排水を処理する場合にはコスト的に問題がある。Additionally, chemicals that suppress nitrification reactions are on the market, but they pose a cost problem when treating large amounts of wastewater.
次に本発明の方法について詳細に説明する。Next, the method of the present invention will be explained in detail.
本発明者等は活性汚泥処理における有機性汚濁物質の分
解反応及びアンモニア化合物の硝化反応等について反応
機構を詳細に検討した結果、第Ｉ図及び第２図に示すよ
うに曝気槽内の酸化還元電位（以下ＯＲＰ）と処理水の
ＣＯＤ及び簾気槽内の窒素酸化物の生成量との間に密接
な関係がある事が明らかになった。まず、有機性汚濁物
質の生物学的分解性とＯＲＰとの関係は第１図に示よう
にＯＲＰが酸化側になる程、処理水のＣＯＤ値が低くな
る。The present inventors have investigated in detail the reaction mechanisms of the decomposition reaction of organic pollutants and the nitrification reaction of ammonia compounds in activated sludge treatment. It has become clear that there is a close relationship between the electric potential (hereinafter referred to as ORP), the COD of treated water, and the amount of nitrogen oxides produced in the aeration tank. First, as shown in FIG. 1, the relationship between the biological degradability of organic pollutants and the ORP is such that the COD value of the treated water decreases as the ORP becomes more oxidized.
更に、ＯＲＰと生物分解残存物質の種類との関係を検討
した結果、フェノールのように比較的活性汚泥によって
分解されやすいものは‐１０皿Ｖ〜仇ｈＶ〔以下金一塩
化銀複合電極測定値（金一銀と塩化線の複合電極測定値
）〕程度でも分解するが、クレゾール、ロダン化合物等
は仇ｈＶ以下では分解率が低下するが、十郎ｈＶ〜十１
０肌Ｖ以下ではほとんど分解する。一方、活性汚泥にお
ける硝化反応は第２図に示すようにＯＲＰ＋１０仇ｈＶ
以下では窒素酸化物をほとんど生成しないが、十１５皿
Ｖ程度から、徐々に窒素酸化物の生成が認められ、十２
００ｈＶ以上になると急激に窒素酸イ物物が生成し、沈
降糟での汚泥の浮上流出が起る。Furthermore, as a result of examining the relationship between ORP and the type of biodegradable residual substances, it was found that substances that are relatively easy to decompose by activated sludge, such as phenol, were found to have a value of -10 V to 2 hV [hereinafter measured with a gold monosilver chloride composite electrode]. Although the decomposition rate of cresol, rhodan compounds, etc. decreases below 10 hV, the decomposition rate decreases below 10 hV, but the decomposition rate of cresol, rhodan compounds, etc.
Below 0 skin V, it is almost decomposed. On the other hand, the nitrification reaction in activated sludge takes place at ORP+10hV as shown in Figure 2.
Below, almost no nitrogen oxides are generated, but from about 115 dishes V, nitrogen oxides are gradually formed, and 12
When the voltage exceeds 00 hV, nitrogen acid compounds are rapidly generated, and sludge floats up and flows out in the settling basin.
また、窒素酸化物の内、亜硝酸性窒素化合物の生成量と
処理水のＣＯＤ、フェノール、ロダン等の残存量との関
係を第３図に示す。Furthermore, among nitrogen oxides, the relationship between the amount of nitrite nitrogen compounds produced and the remaining amount of COD, phenol, rhodan, etc. in the treated water is shown in FIG.
この事から亜硝酸性窒素化合物は８００資化菌の機能を
阻害しており、蛭硝酸性窒素、約５物似上になると阻害
効果は顕著である。したがって蟻気槽内の塵硝酸性窒素
は約５０餌以下に抑制する必要がある。これらの事から
、鰻気槽のＯＲＰは有機性汚濁物質の分解性からは十２
胸ｈＶ以上の酸化側が良いが、窒素酸化物の生成による
汚泥の浮上流出及び函硝酸性窒素化合物によるＢＯＤ資
化菌の機能阻害等から考えると十１５０ｈＶ以下が良い
。暖気槽内のＯＲＰを十５瓜ｈＶから十１５０ｈＶの範
囲に維持すれば、硝化反応をかなり抑制する事ができ、
しかも幾分磁性の有機性汚濁物質も処理する事ができる
。したがって蟻翁槽内のＯＲＰを指際にして活性汚泥処
理を行なえば、窒素酸化物による前述のようなトラブル
の発生がなく、安定した活性汚泥処理ができる。次に曝
気糟のＯＲＰ制御方式について説明する。From this, nitrite nitrogen compounds inhibit the functions of 800 assimilating bacteria, and the inhibitory effect is remarkable when the concentration of nitrite nitrogen compounds is about 50%. Therefore, it is necessary to suppress the amount of dust nitrate nitrogen in the ant tank to about 50 baits or less. Based on these facts, the ORP of the eel tank is 12% in terms of the decomposition of organic pollutants.
The oxidation side should be higher than thoracic hV, but it is better to set it below 1150 hV in view of the upwelling of sludge due to the production of nitrogen oxides and the inhibition of the function of BOD assimilating bacteria by nitrate nitrogen compounds. If the ORP in the warm air tank is maintained within the range of 15 to 1150 hV, the nitrification reaction can be significantly suppressed.
Furthermore, it is possible to treat organic pollutants that are somewhat magnetic. Therefore, if the activated sludge treatment is carried out using the ORP in the ant tank as a guide, the above-mentioned troubles caused by nitrogen oxides will not occur and stable activated sludge treatment will be possible. Next, the ORP control method for the aeration tank will be explained.
暖気槽のＯＲＰは暖気量、流入汚濁物質量、活性汚泥の
濃度及び活性度、温度、柑等によって変動する。これら
の変動要因の内、ＯＲＰ自動制御装置によって比較的容
易に自動制御できるのは爆気量及び流入汚濁物質量であ
る。即ち、ＯＲＰは曝気量が増加すると酸化側電位に、
汚濁物質の流入量が増加すると還元側電位側にそれぞれ
移行する。しかし、流入汚濁物量でＯＲＰを制御する方
式は、活性汚泥に対する汚濁物の負荷量が変動するので
バクテリャに対して好ましくなく、機能低下の原因にな
る。したがって、ＯＲＰ制御方法はＯＲＰ自動制御装置
により曝気槽を調整する方法が最適である。なお、ＯＲ
Ｐの変動要因である温度、ｐＨは活性汚泥に対して最適
な条件に自動制御して維持すれば舟、温度のＯＲＰへの
影響は少ない。次に本発明の実施例について説明する。The ORP of the warm air tank varies depending on the amount of warm air, the amount of inflowing pollutants, the concentration and activity of activated sludge, the temperature, and the like. Among these fluctuation factors, the amount of explosive gas and the amount of inflowing pollutants can be automatically controlled relatively easily by the ORP automatic control device. In other words, ORP changes to the oxidation side potential as the aeration amount increases,
When the inflow amount of pollutants increases, the potential shifts to the reduction side. However, the method of controlling ORP based on the amount of inflowing pollutants is unfavorable for bacteria because the amount of pollutants loaded on the activated sludge varies, which causes a decline in functionality. Therefore, the optimal ORP control method is to adjust the aeration tank using an ORP automatic control device. In addition, OR
Temperature and pH, which are factors that cause P fluctuations, can be automatically controlled and maintained at optimal conditions for activated sludge, so that the influence of temperature on ORP will be small. Next, examples of the present invention will be described.
コークスの製造菱贋より排出する排水を第４図に示す活
性汚泥処理装置を用いて処理した。The wastewater discharged from a coke production facility was treated using an activated sludge treatment device shown in FIG.
即ちコークス製造袋鷹１の排水から油分、タール、浮遊
性物質等を除去した後、排水を貯留槽２に貯留する。こ
の排水（１０重量部）を海水（２０重量部）、淡水（１
の重量部）によって混合槽３で均一に４倍希釈し、更に
州調整槽４で餌７．０〜７．５に調整した後、ＣＯＤ負
荷が０．２〜０．５ｋ９／ＭＢＳｋ９・日になるように
曝気槽５に通水する。この曝気槽５は、活性汚泥濃度（
Ｍ山ＳＳ）約４０００〜８００の四、温度２８〜３が○
で測定検出端としてＯＲＰ（金一塩化銀復合電極）６、
柑測定計７、溶存酸素濃度計８、汚泥濃度計９、温度計
１０、亜硝酸性窒素測定機器１６等を備え、それぞれが
記録計１４に記録される。ＯＲＰ６検出機はＯＲＰ自動
制御装置１１に接続している。ＯＲＰの制御は、ＯＲＰ
制御装贋１１によりブロワー１２を自動制御する。That is, after removing oil, tar, floating substances, etc. from the waste water from the coke production bag hawker 1, the waste water is stored in the storage tank 2. This waste water (10 parts by weight) was mixed with seawater (20 parts by weight) and fresh water (1 part by weight).
After uniformly diluting the bait by 4 times in the mixing tank 3 with the weight part of Water is passed through the aeration tank 5 so that This aeration tank 5 has an activated sludge concentration (
M mountain SS) Approximately 4000-800 4, temperature 28-3 is ○
ORP (gold monosilver chloride polymerization electrode) 6 as the measurement detection end,
It is equipped with a citrus measuring meter 7, a dissolved oxygen concentration meter 8, a sludge concentration meter 9, a thermometer 10, a nitrite nitrogen measuring device 16, etc., each of which is recorded on a recorder 14. The ORP6 detector is connected to the ORP automatic control device 11. The control of ORP is
The blower 12 is automatically controlled by the control device 11.
即ち、暖気槽のＯＲＰが設定ＯＲＰ値より還元側になっ
た場合、ＯＲＰ制御装置１１の制御によりブ。ワー１２
が稼動し蟻気槽５に送風する。蝿気槽５のＯＲＰが設定
値に回復したら、ブロワー１２が停止する。このように
ＯＲＰ制御装置１１によりブロワー１２が制御され、暖
気槽５内のＯＲＰが自動制御される。また、蟻気糟内の
活性汚泥は常時燈梓する必要があり、そのため鍵梓用の
ブロワー１３が必要であり、そのブロワーはＯＲＰ制御
に関係なく常時稼動しており、ＯＲＰ制御用のブロワー
１２と常時稼動しているブロワー１３との送風量の割合
は約１：２である。なお、第４図のＰは送水用ポンプ、
Ｍは凝梓機、１５は活性汚泥の沈降槽を示す。That is, when the ORP of the warming tank becomes lower than the set ORP value, the ORP control device 11 controls the operation. War 12
operates and blows air into the ant tank 5. When the ORP of the fly tank 5 recovers to the set value, the blower 12 stops. In this way, the blower 12 is controlled by the ORP control device 11, and the ORP in the warm-up tank 5 is automatically controlled. In addition, the activated sludge in the ant cage needs to be lit at all times, so a blower 13 for locking is required, and the blower is always operating regardless of ORP control, and the blower 12 for ORP control is required. The ratio of the amount of air blown by the blower 13 and the blower 13 which is constantly operating is approximately 1:2. In addition, P in Fig. 4 is a water pump,
M is a flocculator, and 15 is an activated sludge settling tank.
以上の条件で活性汚泥処理した結果を第１図から第３図
に示す。The results of activated sludge treatment under the above conditions are shown in Figures 1 to 3.
まず、曝気槽のＯＲＰと窒素酸化物（以下Ｎ○ｘ−Ｎ）
の生成量との関係は、第２図に示すように、ＯＲＰ＋１
５仇ｈＶ程度からＮ０ｘ−Ｎが数側程度生成し、十２０
０ｈＶにするとＮ○×一Ｎが５０〜１０Ｑ血と急激に生
成する。次にＯＲＰを十２皿ｈＶ〜２５仇ｈＶに維持し
てＮＯｘ−Ｎを５０〜１５０脚程度生成させた後、ＯＲ
Ｐを十１５仇ｈＶ以下に制御すると、２独特間後にはＮ
Ｏｘ−Ｎの量は約１０脚以下に減少する。このようにＯ
ＲＰを制御する事によりＮ○ｘ−Ｎの生成を任意に調整
する事ができる。次に曝気槽のＯＲＰと処理水のＣＯＤ
との関係を第１図に示すが、ＯＲＰが酸化側にある程Ｃ
ＯＤ値は低く、有機性汚濁物質が良く分解する事を示し
ている。First, ORP of the aeration tank and nitrogen oxides (hereinafter referred to as N○x-N)
As shown in Figure 2, the relationship between the amount of production and the amount of ORP+1
Several degrees of N0x-N are generated from about 5 hV, and about 120
When set to 0hV, N○×1N rapidly generates 50-10Q blood. Next, ORP is maintained at 12 hV to 25 hV to generate about 50 to 150 NOx-N, and then ORP is
When P is controlled to below 115 hV, after 2 hours, N
The amount of Ox-N is reduced to about 10 legs or less. Like this O
By controlling RP, the generation of N○x-N can be arbitrarily adjusted. Next, the ORP of the aeration tank and the COD of the treated water.
Figure 1 shows the relationship between C and C.
The OD value was low, indicating that organic pollutants were well decomposed.
しかし十２０仇ｈＶ以上に維持しているとＮＯ広一Ｎが
発生し第３図に示すようにＮ○ｘ−ＮがＢＯＤ資化菌の
機能を阻害するのと同時に亜硝酸性窒素化合物によりＣ
ＯＤ値が高うなる。したがって曝気槽のＯＲＰを十５仇
ｈＶから十１５伍ｈＶ程度に制御すれば、例え数柳程度
のＮＯ広−Ｎが生成しても８０Ｄ資化菌の機能をほとん
ど阻害せず、また有機性汚濁物質の分解性も良好であり
、更に汚泥沈降槽における汚泥の浮上流出等のトラブル
が発生しない。本発明は好気性活性汚泥処理において爆
気槽のＯＲＰを制御する事により、硝化反応を抑制して
活性汚泥を円滑に行う事ができる。However, if the temperature is maintained at 120 hV or more, NOx-N is generated, and as shown in Figure 3, N○x-N inhibits the function of BOD-assimilating bacteria, and at the same time, nitrite nitrogen compounds cause CO
The OD value is high. Therefore, if the ORP of the aeration tank is controlled from 15 to 115 hV, even if a few willows of NO-N are produced, it will hardly inhibit the function of 80D assimilating bacteria, and the organic The decomposition of pollutants is also good, and troubles such as sludge floating up and flowing out in the sludge settling tank do not occur. The present invention can suppress the nitrification reaction and smoothly perform activated sludge treatment by controlling the ORP of the aeration tank in aerobic activated sludge treatment.
第１図は顔気槽のＯＲＰと活性汚泥処理水のＣＯＤとの
関係を示したものである。
第２図は鰻気糟のＯＲＰと暖気槽の窒素酸化物の生成量
との関係を示したものである。第３図は爆気槽の窒素酸
化物の生成量と活性汚泥処理水のＣＯＤ、フェノール、
ロダンの除去性を示したものである。第４図はコークス
製造装置より排出する排水を活性汚泥処理を行なう場合
の活性汚泥装置の千既略図を示したものである。オー図
汁Ｚ図
分三図
外４図Figure 1 shows the relationship between the ORP of the face tank and the COD of activated sludge treated water. Figure 2 shows the relationship between the ORP of the eel air tank and the amount of nitrogen oxide produced in the warm tank. Figure 3 shows the amount of nitrogen oxide produced in the explosion tank, the COD of activated sludge treated water, phenol,
This shows Rodin's removability. FIG. 4 is a schematic diagram of an activated sludge apparatus for treating wastewater discharged from a coke manufacturing apparatus with activated sludge. O figure soup Z figure part 3 figure outside 4 figure
Claims (1)
水の好気性活性汚泥処理において、曝気槽の酸化還元電
位を金と塩化銀複合電極による測定値が＋５０ｍｖから
＋１５０ｍｖの範囲に制御してアンモニア化合物の硝化
反応を抑制することを特徴とする好気性活性汚泥処理に
おける硝化反応の抑制方法。 ２ 曝気槽内の亜硝酸性窒素が５０ｐｐｍ以下になるよ
うに酸化還元電位を制御する特許求の範囲第１項記載の
方法。[Claims] 1. In aerobic activated sludge treatment of wastewater in which organic pollutants and ammonia compounds coexist, the redox potential of the aeration tank is controlled to a value measured by a gold and silver chloride composite electrode in the range of +50 mv to +150 mv. A method for suppressing a nitrification reaction in aerobic activated sludge treatment, characterized by suppressing the nitrification reaction of an ammonia compound. 2. The method according to claim 1, wherein the redox potential is controlled so that the nitrite nitrogen in the aeration tank is 50 ppm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53060444A JPS6017596B2 (en) | 1978-05-20 | 1978-05-20 | Method for suppressing nitrification reaction in aerobic activated sludge treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53060444A JPS6017596B2 (en) | 1978-05-20 | 1978-05-20 | Method for suppressing nitrification reaction in aerobic activated sludge treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54152351A JPS54152351A (en) | 1979-11-30 |
| JPS6017596B2 true JPS6017596B2 (en) | 1985-05-04 |
Family
ID=13142445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53060444A Expired JPS6017596B2 (en) | 1978-05-20 | 1978-05-20 | Method for suppressing nitrification reaction in aerobic activated sludge treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6017596B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62286597A (en) * | 1986-06-03 | 1987-12-12 | Sumitomo Jukikai Envirotec Kk | Biological denitrification of raw excretion |
| JPH06206086A (en) * | 1993-01-08 | 1994-07-26 | Nippon Steel Corp | Biological treatment of waste liquid and acclimation of microorganism |
| JP2693099B2 (en) * | 1993-01-20 | 1997-12-17 | 新日本製鐵株式会社 | Biological treatment method and acclimation method of microorganisms |
| JP6446220B2 (en) * | 2014-09-29 | 2018-12-26 | 電源開発株式会社 | Jellyfish waste reduction method and jellyfish waste reduction device |
-
1978
- 1978-05-20 JP JP53060444A patent/JPS6017596B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54152351A (en) | 1979-11-30 |
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