JP3171553B2 - Method for separating microorganism-immobilized carrier and method for treating wastewater using the same - Google Patents
Method for separating microorganism-immobilized carrier and method for treating wastewater using the sameInfo
- Publication number
- JP3171553B2 JP3171553B2 JP6770796A JP6770796A JP3171553B2 JP 3171553 B2 JP3171553 B2 JP 3171553B2 JP 6770796 A JP6770796 A JP 6770796A JP 6770796 A JP6770796 A JP 6770796A JP 3171553 B2 JP3171553 B2 JP 3171553B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- microorganism
- immobilized carrier
- wastewater
- nitrification
- 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 - Fee Related
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
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Immobilizing And Processing Of Enzymes And Microorganisms (AREA)
- Biological Treatment Of Waste Water (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水処理槽等に投
入された微生物固定化担体を廃水から分離するための方
法及びこれを利用した廃水の処理方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating microorganism-immobilized carriers put into a sewage treatment tank or the like from wastewater and a method for treating wastewater using the same.
【０００２】[0002]
【従来の技術】微生物による生物反応を利用した廃水処
理において、微生物固定化担体を廃水中に投入して生物
濃度を高めることが行われている。そしてこの微生物固
定化担体が反応槽から流出することを防止するために、
反応槽の出口にスクリーンを設けて微生物固定化担体を
分離する方法が普通である。ところがこのスクリーンに
よる分離方法は、廃水中の夾雑物がスクリーンに付着し
たり絡み付いたりして閉塞し易いため、頻繁に洗浄作業
が必要があり、その洗浄も自動化が困難なためメンテナ
ンスに手数がかかるという問題がある。2. Description of the Related Art In wastewater treatment utilizing a biological reaction by microorganisms, a microorganism-immobilized carrier is put into wastewater to increase the biological concentration. And in order to prevent this microorganism-immobilized carrier from flowing out of the reaction tank,
In general, a screen is provided at the outlet of the reaction tank to separate the microorganism-immobilized carrier. However, this separation method using a screen requires frequent cleaning work because impurities in the wastewater easily adhere to the screen or become entangled with the screen and are clogged, and the cleaning is difficult to automate, so maintenance is troublesome. There is a problem.
【０００３】また、特開昭６３−２７８５９５号公報に
示されているように、微生物固定化担体が投入された反
応槽の出口付近に流速の低い沈殿部を設け、その内部で
微生物固定化担体を沈殿させたうえ沈殿部の下部から濃
縮された微生物固定化担体を取り出す方法も知られてい
る。しかしこの方法は反応槽の内部に沈殿部を設ける必
要があるのでスペース上の問題がある。Further, as disclosed in Japanese Patent Application Laid-Open No. 63-278595, a low-flow rate sedimentation section is provided near the outlet of a reaction vessel into which a microorganism-immobilized carrier has been introduced, and the microorganism-immobilized carrier is provided therein. A method is also known in which the microorganism is immobilized and the concentrated microorganism-immobilized carrier is removed from the lower part of the sedimentation section. However, this method has a space problem since it is necessary to provide a precipitation section inside the reaction tank.
【０００４】さらに、特開平５−２６１３９３号公報に
示されるように、微生物固定化担体が投入された廃水を
ポンプにより流体サイクロンに送って遠心分離する方法
も考えられているが、この方法ではポンプを通過する際
に微生物固定化担体が物理的に破損してしまい、微生物
固定化担体の寿命が短くなってしまうという問題があ
る。Further, as disclosed in Japanese Patent Application Laid-Open No. Hei 5-261393, a method has been considered in which wastewater charged with a microorganism-immobilized carrier is sent to a fluid cyclone by a pump for centrifugal separation. There is a problem in that the microorganism-immobilized carrier is physically damaged when passing through, and the life of the microorganism-immobilized carrier is shortened.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、メンテナンスが容易であり、広いス
ペースを必要とせず、微生物固定化担体が損傷しにくい
微生物固定化担体の分離方法と、これを利用した廃水の
処理方法を提供するためになされたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems, is easy to maintain, does not require a large space, and is a method for separating a microorganism-immobilized carrier which does not easily damage the microorganism-immobilized carrier. And to provide a wastewater treatment method using the same.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた第１の発明の微生物固定化担体の分離方法
は、微生物固定化担体が投入された反応槽の内部出口付
近に遠心分級器を設け、次工程の反応槽との間の落差に
より生じる遠心分級器内の流れを利用して微生物固定化
担体を廃水から分離回収することを特徴とするものであ
る。Means for Solving the Problems The first method for separating a microorganism-immobilized carrier according to the present invention, which has been made to solve the above-mentioned problems, comprises an internal outlet of a reaction vessel into which a microorganism-immobilized carrier is charged.
A centrifugal classifier is provided nearby, and the microorganism-immobilized carrier is separated and recovered from wastewater by utilizing a flow in the centrifugal classifier generated by a head drop between the reactor and the next step .
【０００７】また上記の課題を解決するためになされた
第２の発明の廃水の処理方法は、硝化槽に微生物固定化
担体を用いた生物学的硝化脱窒法による廃水の処理方法
であって、硝化槽の内部出口付近に次工程の沈殿槽との
間の落差により生じる流れを利用した遠心分級器を設け
て廃水中から微生物固定化担体を分離し、分離された微
生物固定化担体を硝化槽の入口へ返送することを特徴と
するものである。また第３の発明は、脱窒槽と硝化槽に
微生物固定化担体を用いた生物学的硝化脱窒法による廃
水の処理方法であって、硝化槽の内部出口付近に次工程
の沈殿槽との間の落差により生じる流れを利用した遠心
分級器を設けて廃水中から微生物固定化担体を分離し、
分離された微生物固定化担体を脱窒槽の入口へ返送する
ことを特徴とするものである。また第４の発明は、脱窒
槽と硝化槽に微生物固定化担体を用いた生物学的硝化脱
窒法による廃水の処理方法であって、脱窒槽の内部出口
付近および硝化槽の内部出口付近に次工程の槽との間の
落差により生じる流れを利用した遠心分級器を設けて廃
水中から微生物固定化担体を分離し、分離された微生物
固定化担体を脱窒槽の入口と硝化槽の入口へそれぞれ返
送することを特徴とするものである。A second aspect of the present invention is a method for treating wastewater by a biological nitrification and denitrification method using a microorganism-immobilized carrier in a nitrification tank. Near the internal outlet of the nitrification tank
A centrifugal classifier utilizing a flow generated by a head drop is provided to separate a microorganism-immobilized carrier from wastewater, and the separated microorganism-immobilized carrier is returned to an inlet of a nitrification tank. Further, a third invention is a method for treating wastewater by a biological nitrification denitrification method using a microorganism-immobilized carrier in a denitrification tank and a nitrification tank , wherein the next step is carried out near an internal outlet of the nitrification tank.
Separating the microorganism-immobilized carrier from the wastewater by providing a centrifugal classifier utilizing the flow generated by the head between the sedimentation tank ,
The separated microorganism-immobilized carrier is returned to the inlet of the denitrification tank. The fourth invention is a method of treating wastewater according to biological nitrification denitrification using microorganisms immobilized carrier denitrification tank and the nitrification tank, an internal outlet of the denitrification tank
Between the tank of the next process and near the internal outlet of the nitrification tank
A centrifugal classifier using the flow generated by the head is provided to separate the microorganism-immobilized carrier from the wastewater, and the separated microorganism-immobilized carrier is returned to the inlet of the denitrification tank and the inlet of the nitrification tank, respectively. Things.
【０００８】更に同一の課題を解決するためになされた
第５の発明は、好気槽に微生物固定化担体を用いた嫌気
・無酸素・好気法による廃水の処理方法であって、好気
槽の内部出口付近に次工程の沈殿槽との間の落差により
生じる流れを利用した遠心分級器を設けて廃水中から微
生物固定化担体を分離し、分離された微生物固定化担体
を好気槽の入口へ返送することを特徴とするものであ
る。また第６の発明は、無酸素槽と好気槽に微生物固定
化担体を用いた嫌気・無酸素・好気法による廃水の処理
方法であって、好気槽の内部出口付近に次工程の沈殿槽
との間の落差により生じる流れを利用した遠心分級器を
設けて廃水中から微生物固定化担体を分離し、分離され
た微生物固定化担体を無酸素槽の入口へ返送することを
特徴とするものである。A fifth invention made to solve the same problem is a method for treating wastewater by an anaerobic / anoxic / aerobic method using a microorganism-immobilized carrier in an aerobic tank. Near the internal outlet of the tank due to a drop between the sedimentation tank of the next process
A centrifugal classifier utilizing the generated flow is provided to separate the microorganism-immobilized carrier from the wastewater, and the separated microorganism-immobilized carrier is returned to the inlet of the aerobic tank. Further, a sixth invention is a method for treating wastewater by an anaerobic / anoxic / aerobic method using a microorganism-immobilized carrier in an anoxic tank and an aerobic tank . Settling tank
A centrifugal classifier that uses a flow generated by a head drop between the wastewater and the microorganism-immobilized carrier is separated from the wastewater, and the separated microorganism-immobilized carrier is returned to the inlet of the oxygen-free tank. It is.
【０００９】また第７の発明は、無酸素槽と好気槽に微
生物固定化担体を用いた嫌気・無酸素・好気法による廃
水の処理方法であって、無酸素槽の内部出口付近および
好気槽の内部出口付近に次工程の槽との間の落差により
生じる流れを利用した遠心分級器を設けて廃水中から微
生物固定化担体を分離し、分離された微生物固定化担体
を無酸素槽の入口と好気槽の入口へそれぞれ返送するこ
とを特徴とするものである。更にまた、第８の発明は、
曝気槽に微生物固定化担体を用いた標準活性汚泥法によ
る廃水の処理方法であって、曝気槽の内部出口付近に次
工程の沈殿槽との間の落差により生じる流れを利用した
遠心分級器を設けて、廃水中から微生物固定化担体を分
離し、分離された微生物固定化担体を曝気槽の入口へ返
送することを特徴とするものである。[0009] A seventh invention is a method of treating wastewater according anaerobic-anoxic-aerobic method using a microorganism immobilization support in the anoxic tank and the aerobic tank, near the internal outlet of the anoxic tank and
Near the internal outlet of the aerobic tank
A centrifugal classifier utilizing the generated flow is provided to separate the microorganism-immobilized carrier from the wastewater, and the separated microorganism-immobilized carrier is returned to the oxygen-free tank inlet and the aerobic tank inlet, respectively. Things. Still further, the eighth invention provides:
A method of processing waste water by standard activated sludge method using microorganism-immobilized carriers in the aeration tank, following around inside the outlet of the aeration tank
A centrifugal classifier utilizing the flow generated by the head from the settling tank in the process is provided to separate the microorganism-immobilized carrier from the wastewater, and the separated microorganism-immobilized carrier is fed to the inlet of the aeration tank . It is characterized by being returned.
【００１０】なお、いずれの発明においても分離回収し
た微生物固定化担体の返送にエアリフトポンプを用いる
ことが好ましく、更に遠心分級器を設ける反応槽と次工
程の反応槽との間の落差を１ｍ以下とすることが好まし
い。In any of the inventions, it is preferable to use an air lift pump for returning the separated and recovered microorganism-immobilized carrier. Further, the head between the reaction tank provided with a centrifugal classifier and the reaction tank in the next step should be 1 m or less. It is preferable that
【００１１】[0011]
【発明の実施の形態】以下に各発明の好ましい実施の形
態を、図面を参照しつつ説明する。図１は本発明に用い
られる遠心分級器を示すもので、21は微生物固定化担体
22が投入された反応槽、23はその次工程の反応槽、24は
それらの間に設置された遠心分級器である。反応槽21の
水面は反応槽23の水面よりも低いが、そのレベル差は１
ｍ以下とされている。なお、遠心分級器24は反応槽21の
槽内出口付近に設置してもよい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of each invention will be described below with reference to the drawings. FIG. 1 is used in the present invention .
Indicates the centrifugal classifier to be used.
Reference numeral 22 denotes a reaction tank charged, 23 denotes a reaction tank of the next process, and 24 denotes a centrifugal classifier installed therebetween. Although the water level in the reaction tank 21 is lower than the water level in the reaction tank 23, the level difference is 1
m or less. Note that the centrifugal classifier 24 may be installed near the outlet of the reaction tank 21 in the tank.
【００１２】微生物固定化担体22としては、比重が1.02
〜1.1 の範囲内にある粒状体が一般に用いられており、
その粒径は３〜15mm程度が普通である。またその材質
は、ポリビニルアルコール(PVA) 、ポリエチレングリコ
ール(PEG) 等の親水性ゲルのほか、スポンジやプラスチ
ックが用いられる。微生物固定化担体22の表面には、硝
化菌等の微生物が高密度に担持されている。The microorganism-immobilized carrier 22 has a specific gravity of 1.02
Granules in the range of ~ 1.1 are commonly used,
The particle size is usually about 3 to 15 mm. In addition, as the material, sponge or plastic is used in addition to hydrophilic gel such as polyvinyl alcohol (PVA) and polyethylene glycol (PEG). On the surface of the microorganism-immobilized carrier 22, microorganisms such as nitrifying bacteria are carried at a high density.
【００１３】遠心分級器24は直径Ｄに対して高さは1/2
〜2 Ｄ、流入口26の径は1/8 〜1/3 Ｄ、サイフォン管28
の径は1/10〜1/3 Ｄ、下部排出口27は1/3 〜1/6Ｄ、底
部のテーパ角は45°〜90°である。またサイフォン管28
の下部には廃水が流出する際に発生する強制渦の成長を
妨げるバッフルプレート等の流れを制御する構造物を設
けることが望ましい。その上端付近の流入口26から反応
槽21内の微生物固定化担体22を含んだ廃水が接線方向に
流入し、槽25の内部でゆるやかなボルテックス流れを形
成する。そしてこれにより生じる遠心力(0.5〜1.5 Ｇ程
度)により、廃水よりも比重がわずかに大きい微生物固
定化担体22は外側に集まり、槽下部の排出口27から取り
出される。また槽25の中心部には微生物固定化担体22を
ほとんど含まない領域が形成されるので、槽25の中心上
部に設置されたサイフォン管28を利用して、微生物固定
化担体22を含まない廃水のみが反応槽23へ取り出され、
このようにして分離・回収された微生物固定化担体22は
反応槽21の入口もしくはその前工程の反応槽の入口へ返
送され、反応槽21内の微生物固定化担体22の濃度は一定
に維持される。The height of the centrifugal classifier 24 is 1/2 of the diameter D.
~ 2D, diameter of inlet 26 is 1/8 ~ 1 / 3D, siphon tube 28
Has a diameter of 1/10 to 1/3 D, the lower outlet 27 has a diameter of 1/3 to 1/6 D, and a taper angle at the bottom is 45 ° to 90 °. Also siphon tube 28
It is desirable to provide a flow control structure such as a baffle plate that prevents the growth of forced vortices generated when the wastewater flows out. Wastewater containing the microorganism-immobilized carrier 22 in the reaction tank 21 flows tangentially from the inlet 26 near the upper end thereof, and forms a gentle vortex flow inside the tank 25. Due to the resulting centrifugal force (about 0.5 to 1.5 G), the microorganism-immobilized carrier 22 having a specific gravity slightly larger than that of the wastewater is collected outside and taken out from the outlet 27 at the lower part of the tank. In addition, since a region containing almost no microorganism-immobilized carrier 22 is formed in the center of the tank 25, the wastewater containing no microorganism-immobilized carrier 22 is utilized by using the siphon tube 28 installed at the upper center of the tank 25. Only to the reaction tank 23,
The microorganism-immobilized carrier 22 thus separated and recovered is returned to the inlet of the reaction vessel 21 or the inlet of the reaction vessel in the preceding step, and the concentration of the microorganism-immobilized carrier 22 in the reaction vessel 21 is kept constant. You.
【００１４】この遠心分級器24内の流れは、反応槽21と
反応槽23との落差によって引起こされるものであるが、
前記したようにこの落差は１ｍ以下とされている。この
ために、遠心分級器24内の流れはゆるやかな流れとな
る。また従来のようにポンプを通過しないので、微生物
固定化担体22が物理的に損傷されることもない。さらに
遠心分級器24は従来のスクリーンのような閉塞によるト
ラブルを招くおそれがないため、メンテナンスの手数が
かからない利点がある。The flow in the centrifugal classifier 24 is caused by the head between the reaction tank 21 and the reaction tank 23.
As described above, this head is set to 1 m or less. For this reason, the flow in the centrifugal classifier 24 becomes a gentle flow. Further, since the carrier does not pass through the pump as in the conventional case, the microorganism-immobilized carrier 22 is not physically damaged. In addition, the centrifugal classifier 24 has the advantage that there is no possibility of causing a trouble due to blockage as in a conventional screen, so that maintenance is not required.
【００１５】本発明の微生物固定化担体の分離方法は、
維持管理が容易で、大きな動力を必要とせずに微生物固
定化担体の分離回収が可能となり、更にその操作による
担体の損傷をほとんどなくすことが可能となる。The method for separating a microorganism-immobilized carrier of the present invention comprises:
The maintenance and management are easy, the separation and recovery of the microorganism-immobilized carrier can be performed without requiring large power, and the damage to the carrier due to the operation can be almost eliminated.
【００１６】次に本発明の廃水の処理方法の実施形態を
示す。図２は第２の発明の実施形態を示す図であり、１
は生物学的硝化脱窒法のための反応槽であり、２の部分
が脱窒槽、３の部分が硝化槽、４は沈殿槽である。第１
の発明では硝化槽３に微生物固定化担体５が投入されて
いる。６は硝化槽２の内部出口付近に設置された遠心分
級器である。沈殿槽４の液面は硝化槽３よりも低いがそ
の落差は１ｍ以下とされている。なお、遠心分級器６は
硝化槽３と沈殿槽４との間に設けることもできる。Next, an embodiment of the method for treating wastewater of the present invention will be described. FIG. 2 is a diagram showing an embodiment of the second invention.
Is a reaction tank for biological nitrification denitrification, 2 is a denitrification tank, 3 is a nitrification tank, and 4 is a sedimentation tank. First
In the invention, the carrier 5 for immobilizing microorganisms is put into the nitrification tank 3. Reference numeral 6 denotes a centrifugal classifier installed near the internal outlet of the nitrification tank 2. The liquid level of the settling tank 4 is lower than that of the nitrification tank 3, but the head is set to 1 m or less. Note that the centrifugal classifier 6 can be provided between the nitrification tank 3 and the precipitation tank 4.
【００１７】微生物固定化担体５を含んだ硝化槽３内の
廃水が遠心分級器６に流入すると、前記の参考例で説明
したように次工程の沈殿槽４との間の落差により生じる
流れを利用した遠心分級器６内の流れによって、微生物
固定化担体５を高密度に含んだ廃水と、微生物固定化担
体５を含まない廃水とに分離される。微生物固定化担体
５を含まない廃水は遠心分級器６の上部のサイフォン管
７より沈殿槽４へ導かれ、微生物固定化担体５を高密度
に含んだ廃水は遠心分級器６の下部の管８より図示しな
いエアリフトポンプで硝化槽３の入口に導かれる。この
ように分離回収された微生物固定化担体５を硝化槽３の
入口へ返送することにより、硝化槽３内の微生物固定化
担体５の濃度は均一に維持される。沈殿槽４への水量と
硝化槽３の入口への水量の比は、１：0.5 から１：３が
望ましい。なお、微生物固定化担体５を含まない廃水
（硝化液）の一部は返送管９により脱窒槽２の入口に返
送され、硝化液循環による硝化脱窒が行われる。When the wastewater in the nitrification tank 3 containing the microorganism-immobilized carrier 5 flows into the centrifugal classifier 6, as described in the aforementioned reference example, a drop between the wastewater and the sedimentation tank 4 in the next step is performed. Caused by
By the flow in the centrifugal classifier 6 using the flow , wastewater containing the microorganism-immobilized carrier 5 at high density and wastewater not containing the microorganism-immobilized carrier 5 are separated. Wastewater that does not contain the microorganism-immobilized carrier 5 is guided to the sedimentation tank 4 from the siphon tube 7 above the centrifugal classifier 6, and wastewater that contains the microorganism-immobilized carrier 5 at a high density is discharged from the lower tube 8 of the centrifugal classifier 6. It is led to the inlet of the nitrification tank 3 by an air lift pump (not shown). By returning the microorganism-immobilized carrier 5 thus separated and recovered to the inlet of the nitrification tank 3, the concentration of the microorganism-immobilized carrier 5 in the nitrification tank 3 is maintained uniformly. The ratio of the amount of water to the settling tank 4 to the amount of water to the inlet of the nitrification tank 3 is preferably from 1: 0.5 to 1: 3. A part of the waste water (nitrification liquid) not containing the microorganism-immobilized carrier 5 is returned to the inlet of the denitrification tank 2 by the return pipe 9, and nitrification denitrification is performed by circulating the nitrification liquid.
【００１８】本発明によれば、微生物固定化担体５の分
離回収が可能であり、硝化槽３内の微生物固定化担体５
の濃度を均一に維持して運転ができる。また落差を利用
した遠心分級器６により微生物固定化担体５の分離回収
を行うため、従来のスクリーンを用いた場合とは異なり
維持管理が容易であり、しかも微生物固定化担体５の物
理的損傷をほとんどなくすることができる。According to the present invention, the microorganism-immobilized carrier 5 can be separated and recovered, and the microorganism-immobilized carrier 5 in the nitrification tank 3 can be recovered.
Can be operated while maintaining a uniform concentration of. In addition, since the microorganism-immobilized carrier 5 is separated and recovered by the centrifugal classifier 6 utilizing a head, maintenance and management are easy unlike the case where a conventional screen is used, and physical damage of the microorganism-immobilized carrier 5 is reduced. Can be almost eliminated.
【００１９】図３は第３の発明の実施形態を示す図であ
り、脱窒槽２と硝化槽３に共通の微生物固定化担体５が
投入されている。硝化槽３の内部出口付近に設けた遠心
分級器６によって沈殿槽４との間の落差を利用して廃水
中から微生物固定化担体５を分離し、分離された微生物
固定化担体５を脱窒槽２の入口へ返送する。この方法に
よれば、第２の発明と同一の効果が得られるほかに、微
生物固定化担体５とともに硝化液も脱窒槽２へ返送され
るので、硝化液循環にも利用できる利点がある。FIG. 3 is a view showing an embodiment of the third invention, in which a common microorganism-immobilizing carrier 5 is supplied to the denitrification tank 2 and the nitrification tank 3. The microorganism-immobilized carrier 5 is separated from the wastewater by utilizing the head between the sedimentation tank 4 and the centrifugal classifier 6 provided near the internal outlet of the nitrification tank 3, and the separated microorganism-immobilized carrier 5 is denitrified. Return to entrance 2. According to this method, in addition to obtaining the same effect as the second invention, the nitrification solution is returned to the denitrification tank 2 together with the microorganism-immobilized carrier 5, so that it can be used for the nitrification solution circulation.
【００２０】図４は第４の発明の実施形態を示す図であ
り、脱窒槽２と硝化槽３にそれぞれの微生物固定化担体
５が投入されている。脱窒槽２の内部出口付近に遠心分
級器6aが設けられており、また硝化槽３の内部出口付近
にも遠心分級器6bが設けられている。そして落差を利用
して遠心分級器6aにより廃水中から分離回収した微生物
固定化担体５は脱窒槽２の入口へ返送され、遠心分級器
6bにより廃水中から分離回収した微生物固定化担体５は
硝化槽３の入口へ返送される。この発明では脱窒槽２と
硝化槽３に専用の微生物固定化担体５を使用できる利点
がある。FIG. 4 is a view showing an embodiment of the fourth invention, in which a microorganism-immobilizing carrier 5 is put in a denitrification tank 2 and a nitrification tank 3. Centrifugal classifier 6a near the internal outlet of the denitrification tank 2 is provided also around the internal outlet of the nitrification tank 3
Centrifugal classifier 6b are provided to. And use the head
The microorganism-immobilized carrier 5 separated and recovered from the wastewater by the centrifugal classifier 6a is returned to the inlet of the denitrification tank 2, and the centrifugal classifier
The microorganism-immobilized carrier 5 separated and recovered from the wastewater by 6b is returned to the inlet of the nitrification tank 3. The present invention has an advantage that a dedicated microorganism-immobilized carrier 5 can be used for the denitrification tank 2 and the nitrification tank 3.
【００２１】図５は第５の発明の実施形態を示す図であ
り、嫌気・無酸素・好気法による廃水の処理を行うため
の好気槽10に微生物固定化担体５が投入されている。好
気槽10の内部出口付近に落差を利用した遠心分級器６を
設けてあり、この遠心分級器６によって廃水中から回収
した微生物固定化担体５は好気槽10の入口へ返送されて
いる。その作用効果は第２の発明と基本的に同様であ
る。FIG. 5 is a view showing an embodiment of the fifth invention, in which a microorganism-immobilized carrier 5 is placed in an aerobic tank 10 for treating wastewater by an anaerobic / anoxic / aerobic method. . A centrifugal classifier 6 utilizing a head is provided near the internal outlet of the aerobic tank 10, and the microorganism-immobilized carrier 5 recovered from wastewater by the centrifugal classifier 6 is returned to the inlet of the aerobic tank 10. . The operation and effect are basically the same as those of the second invention.
【００２２】図６は第６の発明の実施形態を示す図であ
り、嫌気・無酸素・好気法による廃水の処理を行うため
の無酸素槽11と好気槽10に共通の微生物固定化担体５が
投入されている。第３の発明と同様に、好気槽10の内部
出口付近に設けた遠心分級器６によって落差を利用して
廃水中から微生物固定化担体５を分離し、分離された微
生物固定化担体５を無酸素槽11の入口へ返送する。その
作用効果は第３の発明と基本的に同様である。FIG. 6 is a view showing an embodiment of the sixth invention, wherein microorganisms are fixed to an anoxic tank 11 and an aerobic tank 10 for treating wastewater by an anaerobic / anoxic / aerobic method. The carrier 5 is loaded. As in the third invention, the inside of the aerobic tank 10
The centrifugal classifier 6 provided near the outlet uses the head to separate the microorganism-immobilized carrier 5 from the wastewater, and returns the separated microorganism-immobilized carrier 5 to the inlet of the oxygen-free tank 11. The function and effect are basically the same as those of the third invention.
【００２３】図７は第７の発明の実施形態を示す図であ
り、嫌気・無酸素・好気法による廃水の処理を行うため
の無酸素槽11と好気槽10にそれぞれの微生物固定化担体
５が投入されている。そして第４の発明と同様に、無酸
素槽11の内部出口付近に落差を利用した遠心分級器6aが
設けられており、また好気槽10の内部出口付近にも落差
を利用した遠心分級器6bを設けてある。そして遠心分級
器6aにより回収された微生物固定化担体５は無酸素槽11
の入口へ返送し、遠心分級器6bにより回収された微生物
固定化担体５は好気槽10の入口へそれぞれ返送する。そ
の作用効果は第４の発明と基本的に同様である。FIG. 7 is a view showing an embodiment of the seventh invention, wherein microorganisms are respectively immobilized in an anoxic tank 11 and an aerobic tank 10 for treating wastewater by an anaerobic / anoxic / aerobic method. The carrier 5 is loaded. As in the fourth embodiment, a centrifugal classifier 6a utilizing a head is provided near the inner outlet of the oxygen-free tank 11, and a head is also provided near the inner outlet of the aerobic tank 10.
And a centrifugal classifier 6b utilizing the above. Then, the microorganism-immobilized carrier 5 recovered by the centrifugal classifier 6a is supplied to the oxygen-free tank 11
The microorganism-immobilized carrier 5 recovered by the centrifugal classifier 6b is returned to the inlet of the aerobic tank 10 respectively. The operation and effect are basically the same as those of the fourth invention.
【００２４】図８は第８の発明の実施形態を示す図であ
り、標準活性汚泥法による廃水の処理を行うための曝気
槽12にそれぞれの微生物固定化担体５が投入されてい
る。そして、曝気槽12の微生物固定化担体５は曝気槽12
の入口へ返送されている。その作用効果は第２の発明と
基本的に同様である。FIG. 8 is a view showing an embodiment of the eighth invention. Each microorganism-immobilized carrier 5 is put into an aeration tank 12 for treating wastewater by a standard activated sludge method. The carrier 5 for immobilizing microorganisms in the aeration tank 12 is
Has been returned to the entrance. The operation and effect are basically the same as those of the second invention.
【００２５】[0025]
【実施例】（第１の発明の実施例） 平均粒径が４mm、比重1.03 のPVA からなる微生物固定
化担体が10％の濃度で投入された硝化槽の出口付近に、
遠心分級器を設置して微生物固定化担体を分離した。遠
心分級器は直径19cm、高さ17cm、底部のテーパ角60°の
ものであり、硝化槽と沈殿槽との間の落差は50cmであ
る。微生物固定化担体を含有する硝化槽からの廃水は流
量50Ｌ/ 分、流速１m/秒で遠心分級器内部に流入し、微
生物固定化担体が分離された廃水は流量25Ｌ/ 分で沈殿
槽へ排出された。一方、遠心分級器の槽下部の排出口か
らは微生物固定化担体を20％含有する廃水が取り出さ
れ、槽入口に返送された。この際、この遠心分級器から
微生物固定化担体が流出する割合は0.001 ％であり、非
常に高効率で微生物固定化担体の分離が行われた。また
分離された微生物固定化担体を観察したが、全く損傷は
認められなかった。[Example] (Example of the first invention) Near the outlet of a nitrification tank into which a microorganism-immobilized carrier made of PVA having an average particle size of 4 mm and a specific gravity of 1.03 was charged at a concentration of 10%.
The microorganism-immobilized carrier was separated by installing a centrifugal classifier. The centrifugal classifier has a diameter of 19 cm, a height of 17 cm, and a taper angle of 60 ° at the bottom, and the head between the nitrification tank and the settling tank is 50 cm. Wastewater from the nitrification tank containing the microorganism-immobilized carrier flows into the centrifugal classifier at a flow rate of 50 L / min and a flow rate of 1 m / sec, and the wastewater from which the microorganism-immobilized carrier has been separated is discharged into the sedimentation tank at a flow rate of 25 L / min. Was done. On the other hand, wastewater containing 20% of the microorganism-immobilized carrier was taken out from the outlet at the bottom of the tank of the centrifugal classifier, and returned to the inlet of the tank. At this time, the ratio of the microorganism-immobilized carrier flowing out of the centrifugal classifier was 0.001%, and the microorganism-immobilized carrier was separated with very high efficiency. Further, the isolated microorganism-immobilized carrier was observed, but no damage was observed.
【００２６】（第２の発明の実施例） 処理量が70L/分の５段階に分割された容積13m3の硝化槽
に、平均粒径４mm、比重1.03のPVA からなる微生物固定
化担体を1.3m3 （硝化槽容積に対して10％) 投入し、出
口付近（５段目）に140L/ 分処理の遠心分級器を設置し
て微生物固定化担体を分離した。沈殿槽へ70L/分、硝化
槽入口への返送を70L/分で運転を行ったところ、沈殿槽
へ向かう廃水中への微生物固定化担体の流出率は0.001
％であり、返送液中の微生物固定化担体の濃度は略20％
であった。また硝化槽の各段階の微生物固定化担体の濃
度は、1 段目10.5％、２段目10％、３段目9.5 ％、４段
目9.5 ％、５段目10.5％でほぼ推移し、硝化槽各部分の
微生物固定化担体の濃度は均一となった。さらに、三ヵ
月の連続運転の後も、微生物固定化担体には全く損傷は
認められなかった。(Embodiment of the Second Invention) In a nitrification tank having a volume of 13 m 3 divided into five stages with a treatment volume of 70 L / min, a microorganism-immobilized carrier composed of PVA having an average particle size of 4 mm and a specific gravity of 1.03 was added. m 3 (10% of the nitrification tank volume) was introduced, and a microorganism-immobilized carrier was separated by installing a centrifugal classifier of 140 L / min treatment near the outlet (5th stage). When operated at 70 L / min to the sedimentation tank and returned to the nitrification tank inlet at 70 L / min, the outflow rate of the microorganism-immobilized carrier into the wastewater toward the sedimentation tank was 0.001.
%, And the concentration of the microorganism-immobilized carrier in the returned solution is approximately 20%.
Met. In addition, the concentration of the microorganism-immobilized carrier in each stage of the nitrification tank was approximately 10.5% in the first stage, 10% in the second stage, 9.5% in the third stage, 9.5% in the fourth stage, and 10.5% in the fifth stage. The concentration of the microorganism-immobilized carrier in each part of the tank became uniform. Furthermore, even after the continuous operation for three months, no damage was found on the microorganism-immobilized carrier.
【００２７】（第３の発明の実施例） 処理量が70L/分の３段階に分割された容積８m3の脱窒槽
と、５段階に分割された容量13m3の硝化槽に、平均粒径
４mm、比重1.03のPVA からなる微生物固定化担体を2.1m
3 （両槽合計容積に対して10％) 投入し、硝化槽の出口
付近（５段目）に140L/ 分処理の遠心分級器を設置して
微生物固定化担体を分離した。沈殿槽へ70L/分、脱窒槽
入口への返送を70L/分で運転を行ったところ、沈殿槽へ
向かう廃水中への微生物固定化担体の流出率は0.001 ％
であり、返送液中の微生物固定化担体の濃度は略20％で
あった。また脱窒槽の各段階の微生物固定化担体の濃度
は、1 段目10.5％、２段目10％、３段目9.5 ％、硝化槽
の各段階の微生物固定化担体の濃度は、1 段目10％、２
段目10％、３段目10％、４段目9.5 ％、５段目10.5％で
ほぼ推移し、脱窒槽、硝化槽各部分の微生物固定化担体
の濃度は均一となった。なお、３ヵ月の連続運転の後
も、微生物固定化担体には全く損傷は認められなかっ
た。(Embodiment of the Third Invention) The denitrification tank having a capacity of 8 m 3 divided into three stages with a treatment volume of 70 L / min and the nitrification tank having a capacity of 13 m 3 divided into five stages were prepared. Microorganism-immobilized carrier consisting of 4 mm, specific gravity 1.03 PVA is 2.1 m
3 (10% of the total volume of both tanks) was charged, and a microorganism-immobilized carrier was separated by installing a centrifugal classifier of 140 L / min treatment near the outlet (fifth stage) of the nitrification tank. When operation was performed at 70 L / min to the settling tank and return to the denitrification tank at 70 L / min, the outflow rate of the microorganism-immobilized carrier into the wastewater flowing to the settling tank was 0.001%.
The concentration of the microorganism-immobilized carrier in the returned solution was approximately 20%. The concentration of the microorganism-immobilized carrier in each stage of the denitrification tank was 10.5% in the first stage, 10% in the second stage, 9.5% in the third stage, and the concentration of the microorganism-immobilized carrier in each stage of the nitrification tank was 1st stage. 10%, 2
The values were almost unchanged at 10% at the third stage, 10% at the third stage, 9.5% at the fourth stage, and 10.5% at the fifth stage, and the concentration of the microorganism-immobilized carrier in each part of the denitrification tank and the nitrification tank became uniform. After the continuous operation for three months, no damage was found on the microorganism-immobilized carrier.
【００２８】[0028]
【発明の効果】以上に説明したように、第１の発明の微
生物固定化担体の分離方法によれば、微生物固定化担体
を損傷させることなく廃水から分離することができる。
また従来のスクリーンによる分離方法とは異なり目詰ま
りするおそれが皆無であるのでメンテナンスの手数がか
からず、ポンプを必要としないのでランニングコストも
かからない利点がある。更に沈殿部を槽内に設ける必要
もないので、広いスペースも不要である等の多くの利点
を有するものである。また第２〜第８の各発明の廃水の
処理方法によれば、廃水中の微生物固定化担体を回収し
て返送することにより、反応槽内の微生物固定化担体の
濃度を均一に保つことができる利点がある。As described above, according to the method for separating a microorganism-immobilized carrier of the first invention, the microorganism-immobilized carrier can be separated from wastewater without damaging the microorganism-immobilized carrier.
Further, unlike the conventional separation method using a screen, there is no risk of clogging, so there is no need for maintenance, and there is an advantage that a pump is not required and running cost is not required. Further, since there is no need to provide a sedimentation section in the tank, there are many advantages such that a large space is not required. According to the wastewater treatment methods of the second to eighth inventions, the concentration of the microorganism-immobilized carrier in the reaction tank can be kept uniform by collecting and returning the microorganism-immobilized carrier in the wastewater. There are advantages that can be done.
【図１】第１の発明の実施形態を示すフローシートであ
る。FIG. 1 is a flow sheet showing an embodiment of the first invention.
【図２】第２の発明の実施形態を示すフローシートであ
る。FIG. 2 is a flow sheet showing an embodiment of the second invention.
【図３】第３の発明の実施形態を示すフローシートであ
る。FIG. 3 is a flow sheet showing an embodiment of the third invention.
【図４】第４の発明の実施形態を示すフローシートであ
る。FIG. 4 is a flow sheet showing an embodiment of the fourth invention.
【図５】第５の発明の実施形態を示すフローシートであ
る。FIG. 5 is a flow sheet showing an embodiment of the fifth invention.
【図６】第６の発明の実施形態を示すフローシートであ
る。FIG. 6 is a flow sheet showing an embodiment of the sixth invention.
【図７】第７の発明の実施形態を示すフローシートであ
る。FIG. 7 is a flow sheet showing an embodiment of the seventh invention.
【図８】第８の発明の実施形態を示すフローシートであ
る。FIG. 8 is a flow sheet showing an embodiment of the eighth invention.
１ 反応槽、２ 脱窒槽、３ 硝化槽、４ 沈殿槽、５
微生物固定化担体、６ 遠心分級器、6a 遠心分級
器、6b 遠心分級器、７ サイフォン管、８ 担体返送
管、９ 硝化液の返送管、10 好気槽、11 無酸素槽、
12 曝気槽、21反応槽、22 微生物固定化担体、23 次
工程の反応槽、24 遠心分級器、25 槽、26 流入口、
27 排出口、28 サイフォン管1 reaction tank, 2 denitrification tank, 3 nitrification tank, 4 settling tank, 5
Microorganism-immobilized carrier, 6 centrifugal classifier, 6a centrifugal classifier, 6b centrifugal classifier, 7 siphon tube, 8 carrier return tube, 9 nitrifying solution return tube, 10 aerobic tank, 11 anoxic tank,
12 Aeration tank, 21 reaction tank, 22 microorganism immobilization carrier, 23 next step reaction tank, 24 centrifugal classifier, 25 tank, 26 inlet,
27 outlet, 28 siphon tube
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−28887（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/02 - 3/10 C02F 3/28 - 3/34 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-28887 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C02F 3/02-3/10 C02F 3 / 28-3/34
Claims (11)
部出口付近に遠心分級器を設け、次工程の反応槽との間
の落差により生じる遠心分級器内の流れを利用して微生
物固定化担体を廃水から分離回収することを特徴とする
微生物固定化担体の分離方法。1. A reaction vessel containing a microorganism-immobilized carrier .
Part provided a centrifugal classifier near the exit, between the reaction vessel for the next step
A method for separating a microorganism-immobilized carrier, comprising separating and recovering a microorganism-immobilized carrier from wastewater using a flow in a centrifugal classifier caused by a head drop.
的硝化脱窒法による廃水の処理方法であって、硝化槽の
内部出口付近に次工程の沈殿槽との間の落差により生じ
る流れを利用した遠心分級器を設けて廃水中から微生物
固定化担体を分離し、分離された微生物固定化担体を硝
化槽の入口へ返送することを特徴とする廃水の処理方
法。2. A method for treating wastewater by a biological nitrification denitrification method using a microorganism-immobilized carrier in a nitrification tank, comprising the steps of:
Generated by a drop between the settling tank of the next process near the internal outlet
A method for treating wastewater, comprising providing a microorganism-immobilized carrier from wastewater by providing a centrifugal classifier utilizing a flow of wastewater, and returning the separated microorganism-immobilized carrier to an inlet of a nitrification tank.
た生物学的硝化脱窒法による廃水の処理方法であって、
硝化槽の内部出口付近に次工程の沈殿槽との間の落差に
より生じる流れを利用した遠心分級器を設けて廃水中か
ら微生物固定化担体を分離し、分離された微生物固定化
担体を脱窒槽の入口へ返送することを特徴とする廃水の
処理方法。3. A method for treating wastewater by a biological nitrification denitrification method using a microorganism-immobilized carrier in a denitrification tank and a nitrification tank,
Near the internal outlet of the nitrification tank
A method for treating wastewater, comprising separating a microorganism-immobilized carrier from wastewater by providing a centrifugal classifier utilizing a flow generated from the wastewater, and returning the separated microorganism-immobilized carrier to an inlet of a denitrification tank.
た生物学的硝化脱窒法による廃水の処理方法であって、
脱窒槽の内部出口付近および硝化槽の内部出口付近に次
工程の槽との間の落差により生じる流れを利用した遠心
分級器を設けて廃水中から微生物固定化担体を分離し、
分離された微生物固定化担体を脱窒槽の入口と硝化槽の
入口へそれぞれ返送することを特徴とする廃水の処理方
法。4. A method for treating wastewater by a biological nitrification denitrification method using a microorganism-immobilized carrier in a denitrification tank and a nitrification tank,
Next to the inner exit of the denitrification tank and the inner exit of the nitrification tank
Provide a centrifugal classifier using the flow generated by the head between the process tank and separate the microorganism-immobilized carrier from wastewater,
A method for treating wastewater, wherein the separated microorganism-immobilized carrier is returned to an inlet of a denitrification tank and an inlet of a nitrification tank, respectively.
無酸素・好気法による廃水の処理方法であって、好気槽
の内部出口付近に次工程の沈殿槽との間の落差により生
じる流れを利用した遠心分級器を設けて廃水中から微生
物固定化担体を分離し、分離された微生物固定化担体を
好気槽の入口へ返送することを特徴とする廃水の処理方
法。5. An anaerobic method using a microorganism-immobilized carrier in an aerobic tank.
A method of processing waste water by anoxic-aerobic method, raw by drop between the sedimentation tank in the next step in the vicinity of the internal outlet of the aerobic tank
A method for treating wastewater, comprising: providing a centrifugal classifier utilizing a swirling flow , separating a microorganism-immobilized carrier from wastewater, and returning the separated microorganism-immobilized carrier to an inlet of an aerobic tank.
いた嫌気・無酸素・好気法による廃水の処理方法であっ
て、好気槽の内部出口付近に次工程の沈殿槽との 間の落
差により生じる流れを利用した遠心分級器を設けて廃水
中から微生物固定化担体を分離し、分離された微生物固
定化担体を無酸素槽の入口へ返送することを特徴とする
廃水の処理方法。6. A method for treating wastewater by an anaerobic / anoxic / aerobic method using a microorganism-immobilized carrier in an anoxic tank and an aerobic tank, wherein a sedimentation tank of the next step is provided near an internal outlet of the aerobic tank. drop between the
A method for treating wastewater, comprising providing a centrifugal classifier utilizing a flow generated by a difference , separating a microorganism-immobilized carrier from wastewater, and returning the separated microorganism-immobilized carrier to an inlet of an oxygen-free tank.
いた嫌気・無酸素・好気法による廃水の処理方法であっ
て、無酸素槽の内部出口付近および好気槽の内部出口付
近に次工程の槽との間の落差により生じる流れを利用し
た遠心分級器を設けて廃水中から微生物固定化担体を分
離し、分離された微生物固定化担体を無酸素槽の入口と
好気槽の入口へそれぞれ返送することを特徴とする廃水
の処理方法。7. A method for treating wastewater by an anaerobic / anoxic / aerobic method using a microorganism-immobilized carrier in an anoxic tank and an aerobic tank, the method comprising the steps of: With exit
Utilize the flow generated by the head between the tank and the next process
Wastewater treatment method comprising the steps of: separating a microorganism-immobilized carrier from wastewater by providing a centrifugal classifier; and returning the separated microorganism-immobilized carrier to an inlet of an oxygen-free tank and an inlet of an aerobic tank, respectively. .
性汚泥法による廃水の処理方法であって、曝気槽の内部
出口付近に次工程の沈殿槽との間の落差により生じる流
れを利用した遠心分級器を設けて、廃水中から微生物固
定化担体を分離し、分離された微生物固定化担体を曝気
槽の入口へ返送することを特徴とする廃水の処理方法。8. A method of treating waste water according to the standard activated sludge method using microorganism-immobilized carriers in the aeration tank, the inside of the aeration tank
The flow generated by the head near the outlet
A centrifugal classifier is used to separate the microorganism-immobilized carrier from wastewater and aerate the separated microorganism-immobilized carrier.
A method for treating wastewater, wherein the wastewater is returned to an inlet of a tank .
アリフトポンプを用いた請求項２〜８のいずれかに記載
の廃水の処理方法。9. The method for treating wastewater according to claim 2, wherein an air lift pump is used for returning the separated and recovered microorganism-immobilized carrier.
応槽との落差を１ｍ以下とする請求項１に記載の微生物
固定化担体の分離方法。10. The method for separating a microorganism-immobilized carrier according to claim 1, wherein the head between the reaction tank provided with the centrifugal classifier and the reaction tank in the next step is 1 m or less.
応槽との間の落差を１ｍ以下とする請求項２〜９のいず
れかに記載の廃水の処理方法。11. The method for treating wastewater according to claim 2, wherein the head between the reaction tank provided with the centrifugal separator and the reaction tank in the next step is 1 m or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6770796A JP3171553B2 (en) | 1996-02-16 | 1996-03-25 | Method for separating microorganism-immobilized carrier and method for treating wastewater using the same |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-29134 | 1996-02-16 | ||
| JP2913496 | 1996-02-16 | ||
| JP6770796A JP3171553B2 (en) | 1996-02-16 | 1996-03-25 | Method for separating microorganism-immobilized carrier and method for treating wastewater using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09276884A JPH09276884A (en) | 1997-10-28 |
| JP3171553B2 true JP3171553B2 (en) | 2001-05-28 |
Family
ID=26367287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6770796A Expired - Fee Related JP3171553B2 (en) | 1996-02-16 | 1996-03-25 | Method for separating microorganism-immobilized carrier and method for treating wastewater using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3171553B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4926349B2 (en) * | 2001-09-14 | 2012-05-09 | 住友重機械エンバイロメント株式会社 | Wastewater treatment equipment |
| EA018289B1 (en) * | 2007-12-19 | 2013-06-28 | Сауди Арабиан Ойл Компани | Suspended media granular activated carbon membrane biological reactor system |
| PL2163524T5 (en) * | 2008-09-12 | 2018-12-31 | Demon Gmbh | Method for treating wastewater containing ammonium |
-
1996
- 1996-03-25 JP JP6770796A patent/JP3171553B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09276884A (en) | 1997-10-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20030024875A1 (en) | Bioreactor for treating wastewater | |
| JPH0232955B2 (en) | ||
| CN109809653A (en) | A kind of middle and high concentration composite wastewater denitrogenation dephosphorizing treatment process | |
| JPH02214597A (en) | Device for nitrifying sewage | |
| JP3963497B2 (en) | Organic wastewater treatment method and apparatus | |
| US7270750B2 (en) | Clarifier recycle system design for use in wastewater treatment system | |
| JP3244365B2 (en) | Fluid bed carrier recovery method | |
| JP3171553B2 (en) | Method for separating microorganism-immobilized carrier and method for treating wastewater using the same | |
| JP3841394B2 (en) | High concentration organic wastewater treatment method and equipment | |
| CN113716815B (en) | A integration sled dress device for handling high nitrogen phosphorus content domestic sewage | |
| JP3737288B2 (en) | Wastewater treatment system | |
| JP3280293B2 (en) | Water treatment device and water treatment method | |
| JPH07163995A (en) | Biological treatment of organic sewage and device therefor | |
| JP2709357B2 (en) | Aerobic wastewater treatment equipment | |
| JP2579122B2 (en) | Wastewater treatment equipment | |
| JPH11290882A (en) | Nitrogen removing apparatus | |
| JP2561317B2 (en) | Septic tank | |
| JPH08224588A (en) | Biological treatment utilizing carrier stuck with microorganism and device therefor | |
| KR100402304B1 (en) | Biological wastewater treatment system and methods using internal recycling | |
| JP3395927B2 (en) | Biological treatment method and apparatus using microorganism-adhered carrier | |
| JP4926349B2 (en) | Wastewater treatment equipment | |
| JPH0210719B2 (en) | ||
| JP3155457B2 (en) | Wastewater treatment equipment | |
| JPH0975994A (en) | Biological waste water treating device | |
| JP3250042B2 (en) | Wastewater treatment equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010306 |
|
| LAPS | Cancellation because of no payment of annual fees |