JPH04161299A - Treatment of waste water - Google Patents
Treatment of waste waterInfo
- Publication number
- JPH04161299A JPH04161299A JP28397990A JP28397990A JPH04161299A JP H04161299 A JPH04161299 A JP H04161299A JP 28397990 A JP28397990 A JP 28397990A JP 28397990 A JP28397990 A JP 28397990A JP H04161299 A JPH04161299 A JP H04161299A
- Authority
- JP
- Japan
- Prior art keywords
- sulfide
- tank
- nitrite
- bacteria
- return sludge
- 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.)
- Pending
Links
- 239000002351 wastewater Substances 0.000 title abstract description 12
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000010802 sludge Substances 0.000 claims abstract description 31
- 241000894006 Bacteria Species 0.000 claims abstract description 26
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 20
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 15
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 239000011574 phosphorus Substances 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 230000005764 inhibitory process Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 9
- 238000006396 nitration reaction Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 241000605122 Nitrosomonas Species 0.000 description 3
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical group ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 230000001546 nitrifying effect Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 3
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- JGIATAMCQXIDNZ-UHFFFAOYSA-N calcium sulfide Chemical compound [Ca]=S JGIATAMCQXIDNZ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 150000003464 sulfur compounds Chemical class 0.000 description 2
- 229940124639 Selective inhibitor Drugs 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000386 donor Substances 0.000 description 1
- 239000000852 hydrogen donor Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 150000003112 potassium compounds Chemical class 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
- 125000000101 thioether group Chemical group 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【発明の詳細な説明】
Ａ、産業上の利用分野
本発明は廃水処理装置に係り、特に廃水中の窒素除去を
目的とした生物学的硝化脱窒処理および窒素、リンの同
時処理を行う廃水処理方法およびその装置に関するもの
である。[Detailed Description of the Invention] A. Industrial Application Field The present invention relates to a wastewater treatment device, and particularly to wastewater that undergoes biological nitrification and denitrification treatment for the purpose of removing nitrogen from wastewater and simultaneous treatment of nitrogen and phosphorus. The present invention relates to a processing method and an apparatus therefor.
Ｂ１発明の概要
本発明は、生物学的硝化脱出法、または生物学的窒素・
リン除去法であるＡ２０法なとにおいて、返送汚泥を一
時貯留し、硫化物を注入混和し、溶存硫化物濃度を制御
することにより、亜硝酸菌による亜硝酸型硝化を維持さ
せる。B1 Overview of the invention The present invention provides a biological nitrification escape method or a biological nitrogen
In the A20 method, which is a phosphorus removal method, returned sludge is temporarily stored, sulfide is injected and mixed, and the dissolved sulfide concentration is controlled to maintain nitrite-type nitrification by nitrite bacteria.
Ｃ１従来の技術
生物学的硝化・脱窒プロセスニおいて、硝化反応を亜硝
酸型で運転できれば、硝化工程でのプロワ動力費の低減
および脱窒工程での電子供与体（有機物や還元硫黄化合
物）などの供給量の節減ができるだけでなく、脱窒速度
が高まるので脱窒槽の容積を縮少できるなどの利点が生
じる。C1 Conventional technology In biological nitrification and denitrification processes, if the nitrification reaction could be operated in the nitrous acid form, it would reduce blower power costs in the nitrification process and eliminate electron donors (organic substances and reduced sulfur compounds) in the denitrification process. ), the denitrification rate increases, and the volume of the denitrification tank can be reduced.
しかし、現在、亜硝酸型硝化を安定して維持するための
運転条件、あるいは硝酸菌による亜硝酸酸化を持続的に
抑制できる特異的阻害剤は明確になっていない。However, at present, operating conditions for stably maintaining nitrite-type nitrification or specific inhibitors that can sustainably suppress nitrite oxidation by nitrate bacteria have not been clarified.
亜硝酸型硝化を達成する試みとして窒素負荷率とＤＯ濃
度をコントロールしてＮＯ２−濃度を硝酸菌阻害レベル
まで増加させる方法がある。窒素負荷率を高くして、Ｄ
Ｏを低濃度にコントロールすると亜硝酸が蓄積されるが
亜硝酸菌はＮＯ２−に全く影響を受けずＮ Ｏ２−Ｎ
３０００１１９／ ｌでも硝化活性がほとんど低下しな
かったのに対し、硝酸菌の場合はＰＨにより異なるが、
比較的低濃度のＮ０２−（１００〜１０００冨ｇ／ｌ
）でも阻害される。このように硝化により生成したＮＯ
２−自身の選択的阻害性により亜硝酸硝化は安定して維
持される。As an attempt to achieve nitrite-type nitrification, there is a method in which the nitrogen loading rate and DO concentration are controlled to increase the NO2 concentration to a level that inhibits nitrate bacteria. D by increasing the nitrogen loading rate
When O is controlled to a low concentration, nitrite accumulates, but nitrite bacteria are not affected by NO2- at all and N O2-N
3000119/l showed almost no decrease in nitrification activity, whereas in the case of nitrate bacteria, although it differs depending on the pH,
Relatively low concentration of N02- (100-1000g/l
) is also inhibited. NO generated by nitrification in this way
2-Nitrite nitrification is stably maintained due to its own selective inhibitory properties.
Ｄ０発明が解決しようとする課題
生物学的硝化脱窒プロセスは次のような過程を経て行わ
れる。Problems to be Solved by the D0 Invention The biological nitrification and denitrification process is carried out through the following steps.
（１）有機態窒素のアンモニア化
（２）アンモニアの亜硝酸化
亜硝酸菌（Ｎｉｔｒｏｓｏｍｏｎａｓ）ＮＨ４”＋１．
５０２−ＮＯ２−＋Ｈ２０＋２Ｈ″″・・・（２）（３
）亜硝酸態窒素の硝酸化
（４）脱窒素反応
２ＮＯ３−＋１０Ｈ→ Ｎ２＋４Ｈ２０； ２０Ｈ−・
・・（５）窒素除去プロセスを要約すれば次のようにな
る。(1) Ammonification of organic nitrogen (2) Nitrosomonas oxidizing ammonia NH4”+1.
502-NO2-+H20+2H''''...(2)(3
) Nitration of nitrite nitrogen (4) Denitrification reaction 2NO3-+10H→ N2+4H20; 20H-・
(5) The nitrogen removal process can be summarized as follows.
硝化反応して亜硝酸菌（Ｎｉ ｔｒｏｓｏｍｏｎａｓ）
によるアンモニアの亜硝酸化（２）が反応の律速因子と
なる。一般的な処理条件では硝化反応液にはＮＯ□−１
Ｎ Ｏ３−が共存することが多く、反応時間が長くなる
とＮＯ２−はＮＯ３−に転換する。ＮＨ４″″→ＮＯ２
−において窒素ｌｌ１ｇあたり酸素３．４ｔｎｇ、 Ｎ
Ｈ４“→ＮＯ３−において窒素ｌａｇあたり酸素４ 、
６ ｍｇ必要である。したがってＮＯ□−→ＮＯ３−を
抑制すれば、酸素必要量は２５％節減できる。Nitrification reaction causes nitrite bacteria (Ni trosomonas)
The nitrite oxidation of ammonia (2) is the rate-limiting factor of the reaction. Under general treatment conditions, the nitrification reaction solution contains NO□-1
NO3- often coexists, and as the reaction time increases, NO2- is converted to NO3-. NH4″″→NO2
-3.4tng of oxygen per 1g of nitrogen, N
Oxygen 4 per nitrogen lag in H4"→NO3-,
6 mg is required. Therefore, by suppressing NO□-→NO3-, the required amount of oxygen can be reduced by 25%.
ＮＯ３−の脱窒反応はＮＯ２−が中間産物として生成さ
れるが、ＮＯ２−の還元速度はＮＯ２−が蓄積できない
ほど速やかである。したがって脱窒反応においてはＮＯ
３−−Ｎｏ、−すなわち硝酸還元が律速因子と言われて
いる。また脱窒反応において必要な電子供与体（水素供
与体）の量は、ＮＯ２−はＮＯ３−の６０％である。亜
硝酸型硝化に抑制すると、脱窒反応の速度が速くなるこ
とおよび有機物や還元硫黄などの電子供与体の供給量を
４０％節減できる。In the denitrification reaction of NO3-, NO2- is produced as an intermediate product, but the reduction rate of NO2- is so rapid that NO2- cannot be accumulated. Therefore, in the denitrification reaction, NO
3--No.--That is, nitrate reduction is said to be the rate-limiting factor. Further, the amount of electron donor (hydrogen donor) required in the denitrification reaction is 60% of NO2- than NO3-. Suppression to nitrite type nitrification increases the rate of denitrification reaction and reduces the supply amount of electron donors such as organic matter and reduced sulfur by 40%.
前述したＮＯ２−濃度を硝酸菌阻害レベルまで高めて硝
化を亜硝酸型に抑制した実験報告は合成無機廃水を対象
としたものであり、実際の下水の活性汚泥処理において
、ＮＯ２−濃度が硝酸菌に阻害を起こすような濃度まで
高くなることは現実には起こり得ないことであり、適用
不可能であると考えられる。The above-mentioned experimental report in which nitrification was suppressed to the nitrite type by increasing the NO2- concentration to a level inhibiting nitrate bacteria was targeted at synthetic inorganic wastewater; In reality, increasing the concentration to such a level as to cause inhibition is not possible and is therefore considered inapplicable.
本発明は上述の問題点に鑑みてなされたもので、その目
的は、返送汚泥を一時貯留させ、硫化物を注入混和する
ことにより、高性能な廃水処理方法を提供することであ
る。The present invention was made in view of the above-mentioned problems, and its purpose is to provide a high-performance wastewater treatment method by temporarily storing returned sludge and injecting and mixing sulfide.
Ｅ３課題を解決するための手段と作用
本発明は、上記目的を達成するために、流入水を生物学
的硝化脱出法により処理する廃水処理方法において、返
送汚泥を一時貯留させ、この返送汚泥に硫化物を注入混
和し、前記流入水の溶存硫化物濃度を硝酸菌に対する選
択的阻害を起こすレベルとし亜硝酸菌による亜硝型酸化
を持続させる。E3 Means and operation for solving the problem In order to achieve the above object, the present invention, in a wastewater treatment method in which inflow water is treated by a biological nitrification escape method, returns sludge is temporarily stored, and the returned sludge is Sulfide is injected and mixed to bring the concentration of dissolved sulfide in the inflow water to a level that selectively inhibits nitrate bacteria, thereby sustaining nitrite oxidation by nitrite bacteria.
また、本発明は流入水を生物学的硝化脱出法により処理
する廃水処理方法において、返送汚泥を一時貯留させ、
この返送汚泥に硫化物を注入混和し、前記流入水の溶存
硫化物濃度を硝酸菌に対する選択的阻害を起こすレベル
とし亜硝酸菌による亜硝型酸化を持続させるとともに、
硫化物と溶存酸素の反応を用いて嫌気槽のＤＯとＯＲＰ
を下げてリン除去能の維持に必要な嫌気槽の嫌気性度を
制御する。Further, the present invention provides a wastewater treatment method in which inflow water is treated by biological nitrification escape method, in which returned sludge is temporarily stored,
Sulfide is injected and mixed into this returned sludge, and the concentration of dissolved sulfide in the inflow water is set to a level that selectively inhibits nitrate bacteria, and nitrite oxidation by nitrite bacteria is sustained.
DO and ORP in an anaerobic tank using the reaction of sulfide and dissolved oxygen
The anaerobic degree of the anaerobic tank is controlled by lowering the anaerobic temperature required to maintain the phosphorus removal ability.
亜硝酸菌（Ｎｉｔｒｏｓｏｍｏｎａｓ）と硝酸菌（Ｎｉ
ｔｒｏｂａｃｔｅｒ）を合わせて硝化菌と呼ぶが硝化
菌は基質中の溶存硫化物によって阻害を受ける。その阻
害作用はＮｉ ｔｒｏｂａｃｔｅｒに対してより亀裂で
あり、ごく低濃度（１０ｍｇ／／）の硫化物の存在によ
って致命的な打撃を受ける。Ｎｉｔｒｏｓｏｍｏｎａｓ
は硫化物に対してかなり抵抗性があり、ＰＨが低い場合
は１６０ｍｇ＃でも活性阻害を受けないことが知られて
いる。したがって適量の溶存硫化物を与えればアンモニ
アの亜硝酸化は進行するが亜硝酸の硝酸化は阻害され、
硝化を亜硝酸型に抑制することが可能である。Nitrite bacteria (Nitrosomonas) and nitrate bacteria (Ni
trobacter) are collectively called nitrifying bacteria, but nitrifying bacteria are inhibited by dissolved sulfide in the substrate. Its inhibitory effect is more severe against Ni trobacter and is fatally affected by the presence of very low concentrations (10 mg//) of sulfide. Nitrosomonas
It is known that it is quite resistant to sulfide and its activity is not inhibited even at 160 mg # when the pH is low. Therefore, if an appropriate amount of dissolved sulfide is given, the nitrite oxidation of ammonia will proceed, but the nitrification of nitrite will be inhibited.
It is possible to suppress nitrification to the nitrite type.
硝酸菌に対する選択阻害物質となる溶存硫化物を与える
薬剤として硫化カルシウムおよび硫化ナトリウムがある
。これらの硫化物は溶存酸素と反応して硫黄に酸化され
るので溶存酸素濃度が高い硝化槽に直接注入すると注入
量を多くしなければならず不経済である。Calcium sulfide and sodium sulfide are agents that provide dissolved sulfide, which acts as a selective inhibitor against nitrate bacteria. These sulfides react with dissolved oxygen and are oxidized to sulfur, so if they are directly injected into a nitrification tank where the dissolved oxygen concentration is high, the amount of injection must be increased, which is uneconomical.
そこで生物学的硝化・脱窒プロセスあるいは生物学的窒
素・リン同時除去プロセスなどにおいて返送汚泥の一時
貯留槽を設置するとともに硫化物を注入混和して亜硝酸
型硝化を接続するシステムを考案した。Therefore, we devised a system that connects nitrite-type nitrification by installing a temporary storage tank for returned sludge in biological nitrification/denitrification processes or biological nitrogen/phosphorus simultaneous removal processes, and injecting and mixing sulfide.
Ｆ、実施例
以下に本発明の実施例を第１図〜第２図を参照しながら
説明する。F. EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.
第１図は、本発明の第１実施例による廃水処理装置を示
すもので、単段循環法に適用した亜硝酸型硝化システム
である。FIG. 1 shows a wastewater treatment apparatus according to a first embodiment of the present invention, which is a nitrous acid type nitrification system applied to a single-stage circulation method.
第１図において１は返送汚泥を一時貯留する返送汚泥−
時貯留槽、２は撹拌機、３は硫化カルシウムまたは硫化
ナトリウム等の硫化物を注入する硫化物注入機、４は硝
化槽、５は脱窒槽、６は沈澱槽、７はＮｏ、−、Ｎ、０
２−計である。なお、第１図において、４は脱窒槽とし
、５を硝化槽としても良い。In Figure 1, 1 is the return sludge where the return sludge is temporarily stored.
2 is a stirrer, 3 is a sulfide injector for injecting sulfides such as calcium sulfide or sodium sulfide, 4 is a nitrification tank, 5 is a denitrification tank, 6 is a settling tank, 7 is No, -, N ,0
2-total. In addition, in FIG. 1, 4 may be a denitrification tank, and 5 may be a nitrification tank.
第１図の廃水処理装置によれば、硝化槽４に流入廃水か
導かれ硝化処理される。硝化槽４で硝化処理された流入
廃水は脱窒槽５に導かれ脱窒処理される。脱窒槽５で脱
窒処理された流入廃水は、沈澱槽６に導かれる。沈澱槽
６て沈澱した汚泥は、余剰汚泥として系外に排出される
と共に、汚泥返送部８を通して返送汚泥−時貯留槽１に
導かれる。According to the wastewater treatment apparatus shown in FIG. 1, inflowing wastewater is introduced into the nitrification tank 4 and subjected to nitrification treatment. The inflow wastewater that has been nitrified in the nitrification tank 4 is led to the denitrification tank 5 and subjected to denitrification treatment. The inflow wastewater that has been denitrified in the denitrification tank 5 is led to the sedimentation tank 6. The sludge settled in the settling tank 6 is discharged outside the system as surplus sludge, and is also led to the return sludge storage tank 1 through the sludge return section 8.
返送汚泥は、返送汚泥−時貯留槽１において、硫化物注
入器３から注入された硫化物と混和され、返送汚泥に・
含まれる硝酸菌か溶存硫化物による阻害を受けて活性が
低下される。活性が低下された活性汚泥は硝化槽４に導
かれ、この硝化槽４において亜硝酸硝化か維持されるこ
とになる。硫化物の注入率はＳ２−イオンとして１０ｉ
＋ｇ／Ａ！、硫化力ルンウム（固体）の場合は２２．
５ｒｎｇ／Ｉ 、硫化ナトリウム（固体）の場合は２４
．４ｔｔｔｇ／Ｉである。硝化槽４で処理された廃水は
脱窒槽５に導かれるとともに混液循環が行われる。The return sludge is mixed with sulfide injected from the sulfide injector 3 in the return sludge storage tank 1, and the return sludge is mixed with sulfide injected from the sulfide injector 3.
The activity is reduced due to inhibition by the nitrate bacteria contained and dissolved sulfide. The activated sludge whose activity has been reduced is led to the nitrification tank 4, where nitrite nitrification is maintained. The sulfide injection rate is 10i as S2- ions.
+g/A! , 22. for sulfuric acid (solid).
5rng/I, 24 for sodium sulfide (solid)
．． 4tttg/I. The wastewater treated in the nitrification tank 4 is led to the denitrification tank 5, where mixed liquid circulation is performed.
硝化菌は増殖速度が遅いので硫化物の注入は連続的に行
う必要はない。混液のＮ Ｏ２−、Ｎ Ｏ３−濃度をＮ
Ｏ３−、Ｎ Ｏ２−計７で測定し、ＮＯ２−にＮＯ３
−が相対的に高くなった場合に硫化物の注入を行う。Since nitrifying bacteria have a slow growth rate, it is not necessary to continuously inject sulfide. The N O2-, N O3- concentration of the mixed liquid is
O3-, NO2- Measured in total 7, NO3 to NO2-
Inject sulfide when - becomes relatively high.
第２図は本発明の第２実施例による廃水処理装置を示す
もので、第１図のものと同−又は相当部分には同一符号
か付されている。第２図において、９は嫌気槽、１０お
よび１１はこの嫌気槽９に配設されたＤＯ計およびＯＲ
Ｐ計である。FIG. 2 shows a wastewater treatment apparatus according to a second embodiment of the present invention, in which the same or equivalent parts as those in FIG. 1 are given the same reference numerals. In FIG. 2, 9 is an anaerobic tank, 10 and 11 are DO meters and ORs installed in this anaerobic tank 9.
It is a P meter.
第２図の廃水処理装置においては、嫌気槽９に流入され
た廃水のＤＯ濃度をＤＯ計１０で測定すると共に、ＯＲ
Ｐ濃度をＯＲＰ計１１で測定する。In the wastewater treatment apparatus shown in FIG. 2, the DO concentration of wastewater flowing into the anaerobic tank 9 is measured with a DO meter 10, and
The P concentration is measured with an ORP meter 11.
硫化物の注入は雨水の流入などによりＤＯ濃度が上昇し
た場合に適用すると、硫化物がＤＯ濃度を低下させ、リ
ンの除去性能の低下を防止する効果か期待てきる。そこ
で、嫌気槽９内のＯＲＰ濃度を測定し、ＤＯ濃度の上昇
によりＯＲＰ濃度が低下した場合に硫化物の注入を行え
ば良い。つまり、亜硝酸型硝化の接続と嫌気性の○ＲＰ
制御によりリン除去能の接続という２つの効果を狙って
硫化物の注入を行う。When sulfide injection is applied when the DO concentration increases due to inflow of rainwater, it is expected that the sulfide will reduce the DO concentration and prevent the deterioration of phosphorus removal performance. Therefore, the ORP concentration in the anaerobic tank 9 may be measured, and if the ORP concentration decreases due to an increase in the DO concentration, sulfide may be injected. In other words, the connection between nitrite type nitrification and anaerobic ○RP
Sulfide injection is performed with the aim of controlling the two effects of increasing phosphorus removal ability.
Ｇ１発明の効果
本発明は上述の如くであって、次のような効果か得られ
る。G1 Effects of the Invention The present invention is as described above, and provides the following effects.
（１）生物学的硝化脱窒においては亜硝酸型硝化の持続
か可能となりブロワ−の動力費か節減できる。(1) In biological nitrification and denitrification, it is possible to sustain nitrite-type nitrification, and the power cost of the blower can be reduced.
（２）脱窒反応に必要な有機物や還元硫黄化合物の量を
４０％節減できる。また、脱窒速度が速くなるので脱窒
槽の容積を縮少できる。(2) The amount of organic substances and reduced sulfur compounds required for denitrification reactions can be reduced by 40%. Furthermore, since the denitrification rate becomes faster, the volume of the denitrification tank can be reduced.
（３）生物学的窒素・リン同時除去においてＡ２０法な
どに適用すれば嫌気槽の嫌気性度を維持して、ＤＯ、Ｏ
ＲＰの上昇などによるリン除去性能の低下を防止できる
。(3) If the A20 method is applied to biological nitrogen and phosphorus simultaneous removal, the anaerobic degree of the anaerobic tank can be maintained and DO, O
It is possible to prevent a decrease in phosphorus removal performance due to an increase in RP.
（４）硫化物を直接、硝化槽に注入する場合より、溶存
酸素と反応して無効になる分がないので、硫化物注入量
が少なくて済む。(4) Compared to the case where sulfide is directly injected into the nitrification tank, there is no amount of sulfide that reacts with dissolved oxygen and becomes ineffective, so the amount of sulfide injected can be smaller.
第１図は本発明の第１実施例による廃水処理方法を示す
単段循環法に適用した亜硝酸型硝化システムのブロック
図、第２図は本発明の第２実施例による廃水処理方法を
示すＡ２０法に適用した亜硝酸型硝化システムのブロッ
ク図である。
■・・・返送汚泥−時貯留槽、２・・・撹拌機、３・・
・硫化物（ＣａＳまたはＮａ２５）注入機、４・・・硝
化槽、５・・・脱窒槽、６・・・沈澱槽、７・・・Ｎｏ
３−、Ｎｏ２−計、８・・・汚泥返送部、９・・・嫌気
槽、１０・・・ＤＯ計、１１・・・ＯＲＰ計。
第１図
第１起施例
１ 返送汚泥−時貯留槽
２ 攪拌機
３ ｋ化物（ＣａＳｉ２−は凡ｈａｓ）ｉｆ人装置４
硝化槽まｆ−は脱９！槽
、Ｉ 脱窒槽１を−は硝化槽
６ 沈＃槽
７ Ｎす＋、ＮＯ＋１１
ｇ ｓ；ｙ返送部Fig. 1 is a block diagram of a nitrous acid type nitrification system applied to a single-stage circulation method showing a wastewater treatment method according to a first embodiment of the present invention, and Fig. 2 shows a wastewater treatment method according to a second embodiment of the present invention. FIG. 2 is a block diagram of a nitrite-type nitrification system applied to the A20 method. ■...Return sludge - time storage tank, 2...Agitator, 3...
・Sulfide (CaS or Na25) injection machine, 4... Nitrification tank, 5... Denitrification tank, 6... Sedimentation tank, 7... No
3-, No. 2-meter, 8... sludge return section, 9... anaerobic tank, 10... DO meter, 11... ORP meter. Fig. 1 Example 1 Returned sludge - Time storage tank 2 Stirrer 3 Potassium compound (CaSi2- has generally been used) equipment 4
Nitrification tank maf- is out of 9! Tank, I denitrification tank 1 - is nitrification tank 6 sedimentation tank 7 N +, NO + 11 g s; y return section
Claims (2)
処理方法において、返送汚泥を一時貯留させ、この返送
汚泥に硫化物を注入混和し、前記流入水の溶存硫化物濃
度を硝酸菌に対する選択的阻害を起こすレベルとし亜硝
酸菌による亜硝型酸化を持続させることを特徴とする廃
水処理方法。(1) In a wastewater treatment method in which inflow water is treated by biological nitrification escape method, return sludge is temporarily stored, sulfide is injected and mixed into the return sludge, and the concentration of dissolved sulfide in the inflow water is adjusted against nitrate bacteria. A wastewater treatment method characterized by sustaining nitrite-type oxidation by nitrite bacteria at a level that causes selective inhibition.
処理方法において、返送汚泥を一時貯留させ、この返送
汚泥に硫化物を注入混和し、前記流入水の溶存硫化物濃
度を硝酸菌に対する選択的阻害を起こすレベルとし亜硝
酸菌による亜硝型酸化を持続させるとともに、硫化物と
溶存酸素の反応を用いて嫌気槽のＤＯとＯＲＰを下げて
リン除去能の維持に必要な嫌気槽の嫌気性度を制御する
ことを特徴とする廃水処理方法。(2) In a wastewater treatment method in which inflow water is treated by biological nitrification escape method, return sludge is temporarily stored, sulfide is injected and mixed into the return sludge, and the concentration of dissolved sulfide in the inflow water is adjusted against nitrate bacteria. In addition to sustaining nitrite-type oxidation by nitrite bacteria at a level that causes selective inhibition, the DO and ORP of the anaerobic tank are lowered by using the reaction between sulfide and dissolved oxygen to maintain the phosphorus removal ability of the anaerobic tank. A wastewater treatment method characterized by controlling the anaerobic degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28397990A JPH04161299A (en) | 1990-10-22 | 1990-10-22 | Treatment of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28397990A JPH04161299A (en) | 1990-10-22 | 1990-10-22 | Treatment of waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04161299A true JPH04161299A (en) | 1992-06-04 |
Family
ID=17672715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28397990A Pending JPH04161299A (en) | 1990-10-22 | 1990-10-22 | Treatment of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04161299A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005211832A (en) * | 2004-01-30 | 2005-08-11 | Nippon Steel Corp | Method for removing ammonia nitrogen from waste water |
| JP2008036514A (en) * | 2006-08-04 | 2008-02-21 | Fuji Electric Systems Co Ltd | Wastewater treating method |
| JP2011189249A (en) * | 2010-03-12 | 2011-09-29 | Nippon Steel Corp | Biological nitrogen treatment method for ammonia-containing waste water |
-
1990
- 1990-10-22 JP JP28397990A patent/JPH04161299A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005211832A (en) * | 2004-01-30 | 2005-08-11 | Nippon Steel Corp | Method for removing ammonia nitrogen from waste water |
| JP4570069B2 (en) * | 2004-01-30 | 2010-10-27 | 新日本製鐵株式会社 | Method for removing ammonia nitrogen from wastewater |
| JP2008036514A (en) * | 2006-08-04 | 2008-02-21 | Fuji Electric Systems Co Ltd | Wastewater treating method |
| JP2011189249A (en) * | 2010-03-12 | 2011-09-29 | Nippon Steel Corp | Biological nitrogen treatment method for ammonia-containing waste water |
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