JPH0985279A - Oxygen aeration type denitrification treatment apparatus - Google Patents
Oxygen aeration type denitrification treatment apparatusInfo
- Publication number
- JPH0985279A JPH0985279A JP27204895A JP27204895A JPH0985279A JP H0985279 A JPH0985279 A JP H0985279A JP 27204895 A JP27204895 A JP 27204895A JP 27204895 A JP27204895 A JP 27204895A JP H0985279 A JPH0985279 A JP H0985279A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- denitrification
- nitrification
- nitration
- oxygen
- 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
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
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、し尿、下水、食品
排水及び各種産業排水等の窒素化合物を含有した有機性
廃水を脱窒処理する脱窒処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a denitrification treatment device for denitrifying organic wastewater containing nitrogen compounds such as human waste, sewage, food wastewater and various industrial wastewater.
【0002】[0002]
【従来の技術】従来、アンモニア等の窒素化合物を含有
する有機性廃水は、好気性及び嫌気性の生物処理装置を
用いて、生物学的にBOD、COD成分等の有機物を分
解処理すると共に、窒素化合物の脱窒処理も同時に行わ
れている。2. Description of the Related Art Conventionally, an organic wastewater containing a nitrogen compound such as ammonia is biologically decomposed with an organic substance such as BOD and COD components by using an aerobic and anaerobic biological treatment apparatus. Denitrification treatment of nitrogen compounds is also performed at the same time.
【0003】上記生物処理装置としては、好気性状態で
廃水中の窒素化合物を生物学的に酸化して窒素酸化物を
生成する硝化槽と、生成した窒素酸化物を嫌気性状態で
生物学的に還元し窒素ガスとして除去する脱窒槽とを設
けた装置が一般的に実施されており、またその一つの装
置として、脱窒槽に硝化槽の硝化液を循環すると共に、
有機性廃水の原水を供給して脱窒処理する循環脱窒処理
装置がある。As the above-mentioned biological treatment apparatus, a nitrification tank which biologically oxidizes nitrogen compounds in waste water in an aerobic state to produce nitrogen oxides, and the produced nitrogen oxides in an anaerobic state are biologically treated. A device provided with a denitrification tank for reducing and removing as nitrogen gas is generally implemented, and as one of the devices, while circulating the nitrification liquid of the nitrification tank in the denitrification tank,
There is a circulation denitrification treatment device that supplies raw water of organic wastewater to perform denitrification treatment.
【0004】上記循環脱窒処理装置は、図2に示すよう
に、有機性廃水中の有機物を、脱窒槽1における脱窒菌
等の嫌気性菌の生物活性維持のための炭素源や水素供与
体等として利用するため、脱窒槽1に原水供給流路9か
ら原水を供給すると共に、原水の3〜6倍の硝化液を硝
化液循環ポンプ6で抜き出し、硝化液循環流路14を経
て脱窒槽1に循環し、硝化液中の硝酸態や亜硝酸態等の
窒素酸化物を、生物学的に還元して窒素ガスとして除去
した後、脱窒液をオ−バ−フロ−等の水頭差で脱窒液循
環流入口12から硝化槽2に導入して原水中のアンモニ
ア等の窒素化合物を硝化処理する装置である。As shown in FIG. 2, the above-mentioned circulation denitrification treatment apparatus uses a carbon source and a hydrogen donor for maintaining the biological activity of anaerobic bacteria such as denitrifying bacteria in the denitrification tank 1 in the organic wastewater. The raw water is supplied from the raw water supply passage 9 to the denitrification tank 1 and the nitrification solution 3 to 6 times as much as the raw water is extracted by the nitrification solution circulation pump 6, and the denitrification tank is passed through the nitrification solution circulation path 14. 1 to remove nitrogen oxides such as nitric acid and nitrite in the nitrification solution as nitrogen gas by biological reduction, and then remove the denitrification solution from the overhead such as overflow. Is a device for introducing a nitrogen compound such as ammonia in raw water from the denitrification liquid circulation inlet 12 into the nitrification tank 2 for nitrification treatment.
【0005】また、上記硝化槽2は硝化菌等の好気性菌
の生物活性維持のため、好気性雰囲気にされ、好気性に
維持するための酸素は、多量の空気を適宜な散気装置で
供給するのが一般的であるが、動力費や槽設置面積の低
減及び高負荷処理による処理効率の向上等の観点から酸
素富裕ガスを供給する装置も多く用いられている。Further, the nitrification tank 2 is placed in an aerobic atmosphere in order to maintain the biological activity of aerobic bacteria such as nitrifying bacteria, and oxygen for maintaining aerobic conditions is obtained by using a suitable air diffuser for a large amount of air. Although it is generally supplied, an oxygen-rich gas supplying device is often used from the viewpoints of reducing power consumption, tank installation area, and improving processing efficiency by high-load processing.
【0006】更に、上記酸素富裕ガスの供給方法は、図
2に示すように、硝化槽2から循環ポンプ3で3〜6倍
の硝化液を抜き出し、ベンチュリやエゼクタ等の酸素混
合装置4で酸素富裕ガスを硝化液中に混合溶解し、硝化
液循環流路13を経て硝化槽2に循環する方法が用いら
れている。Further, in the method of supplying the oxygen-rich gas, as shown in FIG. 2, the circulation pump 3 draws 3 to 6 times as much nitrification liquid from the nitrification tank 2, and the oxygen is mixed in the oxygen mixing device 4 such as a venturi or an ejector. A method is used in which a rich gas is mixed and dissolved in a nitrification solution and is circulated to the nitrification tank 2 through a nitrification solution circulation channel 13.
【0007】[0007]
【発明が解決しようとする課題】上記従来の酸素富裕ガ
スを硝化槽の酸素供給に用いる循環脱窒処理装置では、
原水の3〜6倍の硝化液を硝化槽から脱窒槽に循環する
と共に、硝化槽2内で、3〜6倍の硝化液を循環して酸
素富裕ガスの混合溶解及び硝化槽内の攪拌をしているた
め、設備費や動力費が十分低減されておらず、それらの
より一層の低減が望まれていた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional denitrification treatment apparatus using the above oxygen-rich gas for supplying oxygen to the nitrification tank,
While circulating 3 to 6 times the nitrification solution of raw water from the nitrification tank to the denitrification tank, circulating 3 to 6 times the nitrification solution in the nitrification tank 2 to mix and dissolve oxygen-rich gas and stir the nitrification tank. Therefore, the equipment cost and the power cost have not been sufficiently reduced, and further reduction thereof has been desired.
【0008】従って本発明は、有機性廃水中の窒素化合
物を酸素富裕ガスを用いて酸化し、生成した窒素酸化物
を還元し窒素ガスとして除去するにあたり、硝化液を脱
窒槽に循環して脱窒処理する循環脱窒処理装置におい
て、設備費や動力費をできるだけ低減する目的で成され
たものである。Therefore, according to the present invention, when the nitrogen compounds in the organic wastewater are oxidized by using the oxygen-rich gas and the generated nitrogen oxides are reduced and removed as nitrogen gas, the nitrification solution is circulated in the denitrification tank to remove the nitrogen. This is intended for the purpose of reducing equipment costs and power costs in a circulating denitrification treatment apparatus for performing nitrogen treatment.
【0009】[0009]
【課題を解決するための手段】前記目的を達成するため
の本発明の要旨は、酸素富裕ガスを供給して好気性状態
とし、有機性廃水中の窒素化合物を生物学的に酸化して
窒素酸化物とする硝化槽と、窒素酸化物を嫌気性状態で
生物学的に還元し窒素ガスとして除去する脱窒槽とを設
けると共に、硝化槽の硝化液を脱窒槽に循環する硝化液
循環流路を設けた循環脱窒処理装置において、脱窒槽の
脱窒液を抜き出す循環ポンプと、酸素富裕ガスを脱窒液
に混合する酸素混合装置とを配置して酸素溶解脱窒液を
硝化槽に循環する脱窒液循環流路と、硝化液を硝化槽か
ら脱窒槽に水頭差で流入させる硝化液循環流入口を設け
たことを特徴とする酸素曝気式脱窒処理装置である。Means for Solving the Problems The gist of the present invention for achieving the above object is to supply an oxygen-rich gas to make it aerobic, and to biologically oxidize nitrogen compounds in organic wastewater to produce nitrogen. A nitrification tank that uses an oxide and a denitrification tank that biologically reduces nitrogen oxides in an anaerobic state and removes it as nitrogen gas, and a nitrification solution circulation channel that circulates the nitrification solution in the nitrification tank to the denitrification tank. In the circulating denitrification treatment device equipped with the above, a circulation pump for extracting the denitrification liquid from the denitrification tank and an oxygen mixing device for mixing the oxygen-rich gas with the denitrification liquid are arranged to circulate the oxygen-dissolved denitrification liquid to the nitrification tank An oxygen aeration-type denitrification treatment apparatus comprising: a denitrification liquid circulation flow path and a nitrification liquid circulation inlet for flowing the nitrification liquid from the nitrification tank into the denitrification tank with a head difference.
【0010】[0010]
【作用】硝化槽から硝化液循環流入口を経て脱窒槽内に
水頭差で循環された硝化液は、嫌気性雰囲気で原水中の
有機物を脱窒菌等の通性嫌気性菌の生物活性維持のため
の炭素源及び水素供与体として利用し、BOD、COD
成分の酸化分解と共に、硝化液中の硝酸態や亜硝酸態等
の窒素酸化物が還元分解され、窒素ガスとして排出され
る。[Function] The nitrification solution circulated by a head difference from the nitrification tank through the nitrification solution circulation inlet into the denitrification tank is used to maintain the biological activity of facultative anaerobic bacteria such as denitrifying bacteria in organic matter in raw water in an anaerobic atmosphere. Used as a carbon source and hydrogen donor for BOD, COD
Along with the oxidative decomposition of the components, nitrogen oxides such as nitric acid and nitrite in the nitrification solution are reductively decomposed and discharged as nitrogen gas.
【0011】脱窒処理された脱窒液は、脱窒槽から脱窒
液循環流路を経て硝化槽に供給され、好気性雰囲気で残
余の有機物及び窒素化合物が硝化菌等の好気性菌の生物
学的作用で酸化分解されると共に、アンモニア等の窒素
化合物が硝酸態や亜硝酸態等の窒素酸化物に酸化され
る。The denitrification liquid subjected to the denitrification treatment is supplied from the denitrification tank to the nitrification tank through the denitrification liquid circulation passage, and the remaining organic substances and nitrogen compounds are aerobic organisms such as nitrifying bacteria in an aerobic atmosphere. The nitrogen compounds such as ammonia are oxidized into nitrogen oxides such as nitric acid and nitrite in addition to being oxidatively decomposed by biological action.
【0012】また脱窒槽の脱窒液が、脱窒液循環流路か
ら循環ポンプで抜き出され、酸素混合装置で酸素富裕ガ
スが混合溶解されたのち硝化槽に循環されることによ
り、硝化槽内の好気性雰囲気が維持されると共に攪拌が
行なわれ、硝化菌等の好気性菌の生物活性が高められ
る。Further, the denitrification liquid in the denitrification tank is extracted from the denitrification liquid circulation channel by a circulation pump, and the oxygen-rich gas is mixed and dissolved in the oxygen mixing device and then circulated to the nitrification tank, whereby The aerobic atmosphere inside is maintained and agitation is performed to enhance the biological activity of aerobic bacteria such as nitrifying bacteria.
【0013】従って、従来、原水の3〜6倍の硝化液に
酸素を溶解して硝化槽内で循環し、また原水の3〜6倍
の硝化液を別の流路及びポンプを用いて脱窒槽に循環し
ていたため、動力費等が嵩んでいたが、本発明の酸素曝
気式脱窒処理装置では、硝化液の脱窒槽への循環を水頭
差で行い、脱窒液に酸素を溶解して硝化槽に循環してい
るため、動力費等の低廉化が図られる。Therefore, conventionally, oxygen is dissolved in 3 to 6 times the nitrification solution of raw water and circulates in the nitrification tank, and 3 to 6 times the nitrification solution of the raw water is removed using another channel and pump. Since it was circulated in the nitrification tank, power costs and the like were high, but in the oxygen aeration type denitrification treatment device of the present invention, the nitrification solution is circulated to the denitrification tank by a head difference to dissolve oxygen in the denitrification solution. Since it is circulated to the nitrification tank, the power cost can be reduced.
【0014】[0014]
【発明の実施の形態】本発明の実施の形態を図面に基づ
いて説明する。図1は本発明の一実施の形態の酸素曝気
式脱窒処理装置の系統図であり、図2は従来の酸素曝気
式脱窒処理装置の系統図である。尚、両図において相当
する部材については、同一符番を用いている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an oxygen aeration type denitrification treatment device according to an embodiment of the present invention, and FIG. 2 is a system diagram of a conventional oxygen aeration type denitrification treatment device. The same reference numerals are used for corresponding members in both drawings.
【0015】図1において、1は上部にガス排出流路2
0、有機性廃水の原水供給流路9及び返送汚泥循環流路
15が接続し、底部に酸素混合用の脱窒液循環流路11
が接続した密閉構造の脱窒槽であり、2は上部に硝化液
を排出する硝化液排出流路17が接続し、底部に酸素混
合脱窒液の液噴射装置5を配置し、上面が開放した硝化
槽であるが、本槽は密閉構造としてもよい。In FIG. 1, reference numeral 1 denotes a gas discharge channel 2 at the upper part.
0, the raw water supply flow passage 9 of the organic waste water and the return sludge circulation flow passage 15 are connected, and the denitrifying liquid circulation passage 11 for oxygen mixing is provided at the bottom.
2 is a closed structure denitrification tank, 2 is connected to a nitrification solution discharge passage 17 for discharging the nitrification solution at the upper part, a liquid injection device 5 for oxygen mixed denitrification solution is arranged at the bottom part, and the upper surface is opened. Although this is a nitrification tank, the main tank may have a closed structure.
【0016】上記脱窒槽1及び硝化槽2は離して設けて
もよいが、隣接して設けるのが設置面積低減のうえから
好ましく、また硝化液が硝化槽2から脱窒槽1に水頭差
で流入するように硝化液循環流入口10が設けられてい
る。The denitrification tank 1 and the nitrification tank 2 may be provided separately, but it is preferable to provide them adjacently in order to reduce the installation area, and the nitrification liquid flows from the nitrification tank 2 into the denitrification tank 1 by a water head difference. In order to do so, the nitrification liquid circulation inlet 10 is provided.
【0017】また上記硝化液循環流入口10は、硝化槽
2側の液面を脱窒槽1側の液面よりも高く保持して、水
頭差で流入するように配置して成り、脱窒槽1と硝化槽
2との仕切り部に開口を設けるだけでもよいが、オ−バ
−フロ−で流入するように構成するのが好ましく、流入
口10をオ−バ−フロ−管として硝化槽2内に配置して
もよく、また外部に樋として付設してもよい。The nitrification liquid circulation inlet 10 is arranged so that the liquid surface on the side of the nitrification tank 2 is kept higher than the liquid surface on the side of the denitrification tank 1 so that the nitrification liquid flows in at a head difference. Although an opening may be provided only in the partition between the nitrification tank 2 and the nitrification tank 2, it is preferable that the opening be inflowed by an overflow, and the inflow port 10 is an overflow tube in the nitrification tank 2. It may be arranged in the above or may be attached to the outside as a gutter.
【0018】更に、硝化液排出流路17に計量セキなど
の流量調節装置を設け、硝化液循環流量や硝化液排出流
量を所定量となるように調節して、硝化槽2の液面高さ
を調節することにより硝化液の脱窒槽1への循環量を調
節するのが好ましい。Further, a flow rate adjusting device such as a metering valve is provided in the nitrification solution discharge passage 17, and the nitrification solution circulation flow rate and the nitrification solution discharge flow rate are adjusted to a predetermined amount, and the liquid level of the nitrification tank 2 is adjusted. It is preferable to adjust the circulation amount of the nitrification liquid to the denitrification tank 1 by adjusting
【0019】脱窒液循環流路11は、脱窒槽1の脱窒液
を抜き出す循環ポンプ3と、酸素富裕ガスを脱窒液に混
合溶解する酸素混合装置4とを途中に配置し,硝化槽2
の底部に配置した液噴射装置5に接続している。The denitrification liquid circulation passage 11 has a circulation pump 3 for extracting the denitrification liquid from the denitrification tank 1 and an oxygen mixing device 4 for mixing and dissolving oxygen-rich gas into the denitrification liquid, and the nitrification tank Two
It is connected to the liquid ejecting apparatus 5 arranged at the bottom of the.
【0020】上記酸素混合装置4は、液中にガスを混合
溶解できる装置であればよいが、ベンチュリやエゼクタ
等のように、液を噴射して生じる減圧でガスを吸入する
と共に、強乱流でガスを液中に混合溶解する装置が、酸
素溶解効率の面から好ましく、また上記液噴射装置5は
液を水平方向に噴射するように、複数の噴射ノズルを横
設しているが、これには限定されない。The oxygen mixing device 4 may be any device capable of mixing and dissolving a gas in a liquid, but like a venturi or an ejector, the gas is sucked at a reduced pressure generated by injecting the liquid and a strong turbulent flow is generated. A device for mixing and dissolving gas in a liquid is preferable from the viewpoint of oxygen dissolution efficiency, and the liquid injection device 5 has a plurality of injection nozzles horizontally arranged so as to inject the liquid in the horizontal direction. It is not limited to
【0021】また上記酸素混合装置4に供給される酸素
富裕ガスは、液体酸素をガス化した純酸素やPSA装置
により空気から窒素を吸着分離して酸素を濃縮した濃縮
酸素等が用いられるが、設備の小型化や動力費の低減及
び酸素溶解効率等の面から純酸素を用いるのが好まし
い。The oxygen-rich gas supplied to the oxygen mixing device 4 may be pure oxygen gasified from liquid oxygen or concentrated oxygen obtained by adsorbing and separating nitrogen from air by a PSA device to concentrate oxygen. It is preferable to use pure oxygen in terms of downsizing of equipment, reduction of power cost, oxygen dissolution efficiency and the like.
【0022】7は硝化液中の汚泥を沈降分離する沈殿槽
であり、上部に上澄み液を処理水として排出する処理水
排出流路18が接続し、底部に沈降汚泥を汚泥抜き出し
ポンプ8で抜き出し、一部を余剰汚泥として排出する余
剰汚泥排出流路16が分岐し、残部の汚泥を脱窒槽1に
循環する返送汚泥供給流路15が接続している。Reference numeral 7 is a settling tank for settling and separating the sludge in the nitrification solution. A treated water discharge channel 18 for discharging the supernatant liquid as treated water is connected to the upper part, and the settling sludge is drawn out by a sludge extraction pump 8 to the bottom part. The excess sludge discharge flow channel 16 for discharging a part of the excess sludge is branched, and the return sludge supply flow channel 15 for circulating the remaining sludge to the denitrification tank 1 is connected.
【0023】以下に上記構成の酸素曝気式脱窒処理装置
の作用について述べる。硝化槽2から硝化液循環流入口
10を経て脱窒槽1内に水頭差で流入された硝化液は、
嫌気性雰囲気で原水供給流路9から供給された有機性廃
水の原水中の有機物を、脱窒菌等の通性嫌気性菌の生物
活性維持のための炭素源及び水素供与体として利用し、
原水中の有機物は生物学的に酸化分解されると共に、硝
化液中の窒素酸化物は窒素ガスとして還元され、ガス排
出流路20から排出される。The operation of the oxygen aeration type denitrification treatment apparatus having the above construction will be described below. The nitrification liquid that has flowed into the denitrification tank 1 from the nitrification tank 2 through the nitrification liquid circulation inlet 10 with a head difference is
Utilizing the organic matter in the raw water of the organic wastewater supplied from the raw water supply channel 9 in an anaerobic atmosphere as a carbon source and a hydrogen donor for maintaining the biological activity of facultative anaerobic bacteria such as denitrifying bacteria,
Organic substances in the raw water are biologically oxidatively decomposed, and nitrogen oxides in the nitrification solution are reduced as nitrogen gas and discharged from the gas discharge passage 20.
【0024】脱窒液は脱窒槽1から脱窒液循環流路11
を経て循環ポンプ3で抜き出され、酸素混合装置4で酸
素富裕ガスを混合溶解したのち液噴射装置5から硝化槽
2に供給され、好気性雰囲気で残余の有機物及び原水中
の窒素化合物が硝化菌などの好気性菌の生物学的作用で
酸化分解されると共に、アンモニア等の窒素化合物は硝
酸態や亜硝酸態等の窒素酸化物に酸化される。The denitrification liquid is passed from the denitrification tank 1 to the denitrification liquid circulation passage 11
After being extracted by the circulation pump 3 and mixed and dissolved by the oxygen mixing device 4 with the oxygen-rich gas, it is supplied from the liquid injection device 5 to the nitrification tank 2, and the remaining organic substances and nitrogen compounds in the raw water are nitrified in an aerobic atmosphere. While being oxidatively decomposed by the biological action of aerobic bacteria such as bacteria, nitrogen compounds such as ammonia are oxidized to nitrogen oxides such as nitrate and nitrite.
【0025】上記酸素混合装置4としてベンチュリやエ
ゼクタ等のように、液を噴射して生じる減圧でガスを吸
入すると共に、強乱流でガスを液中に混合溶解する装置
を用いることにより、酸素溶解効率が90〜95%を達
成することができるため、動力費も低廉で高負荷処理が
可能となる。As the oxygen mixing device 4, a device such as a venturi or an ejector that sucks gas at a reduced pressure generated by jetting the liquid and mixes and dissolves the gas in the liquid with strong turbulence is used. Since the dissolution efficiency can reach 90 to 95%, the power cost is low and high load treatment is possible.
【0026】窒素除去された硝化液は硝化液排出流路1
7から沈殿槽7に導入され、沈降汚泥と上澄み水とに分
離されて上澄み水は処理水として処理水排出流路18か
ら系外に排出され、また沈降汚泥は汚泥抜き出しポンプ
8により抜き出され、一部は返送汚泥循環流路15から
脱窒槽1に循環され、残部は余剰汚泥排出流路16から
余剰汚泥として系外に排出される。The nitrification liquid from which nitrogen has been removed is in the nitrification liquid discharge channel 1
7 is introduced into the settling tank 7, separated into settling sludge and supernatant water, and the supernatant water is discharged as treated water from the treated water discharge channel 18 to the outside of the system, and the settled sludge is extracted by the sludge extraction pump 8. A part of the sludge is circulated to the denitrification tank 1 through the return sludge circulation flow path 15, and the rest is discharged from the system as excess sludge through the excess sludge discharge flow path 16.
【0027】尚、上記脱窒処理において、硝化槽2にお
けるNH4 −N容積負荷は、通常0.4〜2kgN/m
3 ・Dで運転され、また脱窒液の循環量や酸素富裕ガス
の供給量は処理する有機性廃水の性状やN、BOD容積
負荷等により制御される。In the above denitrification treatment, the NH 4 -N volume load in the nitrification tank 2 is usually 0.4 to 2 kgN / m.
Operated at 3 · D, also the supply amount of the circulating amount or the oxygen rich gas denitrified liquid is nature and N of an organic waste water to be processed is controlled by the BOD volume load, and the like.
【0028】[0028]
【発明の効果】本発明は、酸素富裕ガスを硝化槽の酸素
供給に用いる循環脱窒処理装置において、原水の3〜6
倍の硝化液を硝化槽から脱窒槽に循環する循環ポンプや
循環流路を不要としたため、設備費や動力費をより一層
低減することができる。INDUSTRIAL APPLICABILITY The present invention relates to a circulating denitrification treatment apparatus which uses an oxygen-rich gas for supplying oxygen to a nitrification tank, and has 3 to 6 raw water.
Since the circulation pump and the circulation flow path for circulating the double nitrification liquid from the nitrification tank to the denitrification tank are not necessary, the equipment cost and the power cost can be further reduced.
【図1】本発明の一実施の形態の酸素曝気式脱窒処理装
置の系統図FIG. 1 is a system diagram of an oxygen aeration type denitrification treatment apparatus according to an embodiment of the present invention.
【図2】従来の酸素曝気式脱窒処理装置の系統図[Fig. 2] System diagram of a conventional oxygen aeration-type denitrification treatment device
1:脱窒槽 2:硝化槽 3:循環ポンプ 4:酸素混合装置 5:液噴射装置 6:硝化液循環ポンプ 7:沈殿槽 8:汚泥抜き出しポンプ 9:原水供給流路 10:硝化液循環流入口 11:酸素混合用の脱窒液循環流路 12:脱窒液循環流入口 13:酸素混合用の硝化液循環流路 14:硝化液循環流路 15:返送汚泥循環流路 16:余剰汚泥排出流路 17:硝化液排出流路 18:処理水排出流路 19:酸素富裕ガス供給流路 20:ガス排出流路 1: Denitrification tank 2: Nitrification tank 3: Circulation pump 4: Oxygen mixing device 5: Liquid injection device 6: Nitrification liquid circulation pump 7: Settling tank 8: Sludge extraction pump 9: Raw water supply flow passage 10: Nitrification liquid circulation inlet 11: Denitrification liquid circulation flow passage for oxygen mixing 12: Denitrification liquid circulation inlet 13: Nitrification liquid circulation passage for oxygen mixing 14: Nitrification liquid circulation passage 15: Return sludge circulation passage 16: Excess sludge discharge Flow path 17: Nitrifying solution discharge flow path 18: Treated water discharge flow path 19: Oxygen-rich gas supply flow path 20: Gas discharge flow path
Claims (1)
有機性廃水中の窒素化合物を生物学的に酸化して窒素酸
化物とする硝化槽と、窒素酸化物を嫌気性状態で生物学
的に還元し窒素ガスとして除去する脱窒槽とを設けると
共に、硝化槽の硝化液を脱窒槽に循環する硝化液循環流
路を設けた循環脱窒処理装置において、脱窒槽の脱窒液
を抜き出す循環ポンプと、酸素富裕ガスを脱窒液に混合
する酸素混合装置とを配置して酸素溶解脱窒液を硝化槽
に循環する脱窒液循環流路と、硝化液を硝化槽から脱窒
槽に水頭差で流入させる硝化液循環流入口を設けたこと
を特徴とする酸素曝気式脱窒処理装置。1. An oxygen-rich gas is supplied to bring it into an aerobic state,
A nitrification tank that biologically oxidizes nitrogen compounds in organic wastewater to nitrogen oxides, and a denitrification tank that biologically reduces nitrogen oxides in an anaerobic state to remove as nitrogen gas, In a circulation denitrification treatment device equipped with a nitrification solution circulation channel that circulates the nitrification solution from the nitrification tank to the denitrification tank, a circulation pump that extracts the denitrification solution from the denitrification tank and an oxygen mixture that mixes oxygen-rich gas with the denitrification solution A denitrification liquid circulation flow path for circulating the oxygen-dissolved denitrification liquid to the nitrification tank and a nitrification liquid circulation inlet for flowing the nitrification liquid from the nitrification tank to the denitrification tank with a head difference are provided. An oxygen aeration type denitrification treatment device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27204895A JPH0985279A (en) | 1995-09-27 | 1995-09-27 | Oxygen aeration type denitrification treatment apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27204895A JPH0985279A (en) | 1995-09-27 | 1995-09-27 | Oxygen aeration type denitrification treatment apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0985279A true JPH0985279A (en) | 1997-03-31 |
Family
ID=17508390
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP27204895A Pending JPH0985279A (en) | 1995-09-27 | 1995-09-27 | Oxygen aeration type denitrification treatment apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0985279A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100387765B1 (en) * | 2001-01-11 | 2003-06-18 | 광주과학기술원 | Intracircular treatment of drainage or waste water using pure oxygen and a medium for holding microorganisms |
JP2007160147A (en) * | 2005-12-09 | 2007-06-28 | Mitsubishi Heavy Ind Ltd | Advanced sewage treatment method and system |
JP2012075988A (en) * | 2010-09-30 | 2012-04-19 | Sanyo Shisetsu Kogyo Kk | Waste water pretreatment method and waste water pretreatment apparatus |
-
1995
- 1995-09-27 JP JP27204895A patent/JPH0985279A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100387765B1 (en) * | 2001-01-11 | 2003-06-18 | 광주과학기술원 | Intracircular treatment of drainage or waste water using pure oxygen and a medium for holding microorganisms |
JP2007160147A (en) * | 2005-12-09 | 2007-06-28 | Mitsubishi Heavy Ind Ltd | Advanced sewage treatment method and system |
JP2012075988A (en) * | 2010-09-30 | 2012-04-19 | Sanyo Shisetsu Kogyo Kk | Waste water pretreatment method and waste water pretreatment apparatus |
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