JP2002079283A - Aerobic treatment tank - Google Patents
Aerobic treatment tankInfo
- Publication number
- JP2002079283A JP2002079283A JP2000267905A JP2000267905A JP2002079283A JP 2002079283 A JP2002079283 A JP 2002079283A JP 2000267905 A JP2000267905 A JP 2000267905A JP 2000267905 A JP2000267905 A JP 2000267905A JP 2002079283 A JP2002079283 A JP 2002079283A
- Authority
- JP
- Japan
- Prior art keywords
- treatment tank
- treated
- water
- flow
- carrier
- 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
- Biological Treatment Of Waste Water (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は好気性処理槽に係
り、特に、下水・し尿・産業排水等の有機性排水を、微
生物固定化担体を利用して生物学的に処理する好気性処
理槽に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerobic treatment tank, and more particularly, to an aerobic treatment tank for biologically treating organic wastewater such as sewage, human waste, and industrial wastewater using a microorganism-immobilized carrier. About.
【０００２】[0002]
【従来の技術】下水や産業排水中のＢＯＤや窒素を高速
・短時間で処理するため、微生物を固定化した担体を用
いる方法が実施されている。この方法は、密度が水より
数％程度大きい担体に微生物を固定化して処理槽に投入
し、この担体を散気手段によって発生する槽内の循環流
によって流動させながら、被処理水を生物学的に処理し
ている。2. Description of the Related Art In order to treat BOD and nitrogen in sewage and industrial wastewater at high speed and in a short time, a method using a carrier on which microorganisms are immobilized has been practiced. In this method, microorganisms are immobilized on a carrier having a density about several percent greater than that of water, and the microorganisms are introduced into a treatment tank. Processing.
【０００３】従来の好気性処理槽の構造図の一例を図５
に示す。処理槽１には、流入管２から供給された被処理
水３が貯留され、該被処理水３中には、微生物を固定化
した担体４、４…が投入されている。処理槽１の中央部
には、処理槽１の内部を２つの区画１Ａ、１Ｂに区分け
する導流板５が設置され、該導流板５の上下端には、被
処理水３と担体４とが流動可能な開口が形成される。FIG. 5 shows an example of a structural diagram of a conventional aerobic treatment tank.
Shown in In the treatment tank 1, the water to be treated 3 supplied from the inflow pipe 2 is stored. In the water to be treated 3, carriers 4, 4,. In the center of the treatment tank 1, a flow guide plate 5 for dividing the inside of the treatment tank 1 into two sections 1A and 1B is installed. An opening through which the fluid can flow is formed.
【０００４】区画１Ａには、散気装置６が設けられてい
る。該散気装置６は、空気管７を介して供給された空気
を被処理水３中に散気する。これにより、区画１Ａの被
処理水３にエアリフト作用が働いて、被処理水３が上昇
する。上昇した被処理水３は、導流板５の上端を越えて
区画１Ｂに下降流を形成し、さらに、導流板５の下端か
ら区画１Ａに流入して再び上昇流を形成する。担体４
は、この被処理水３の循環流にのって二つの区画１Ａ、
１Ｂを循環する。これにより、被処理水３が生物学的に
処理される。処理された被処理水３は、スクリーン８を
介して流出管９から排出される。[0004] In the section 1A, an air diffuser 6 is provided. The air diffuser 6 diffuses the air supplied through the air pipe 7 into the water 3 to be treated. As a result, the air 3 acts on the water 3 to be treated in the section 1A, and the water 3 rises. The raised water to be treated 3 forms a downward flow in the section 1B beyond the upper end of the flow guide plate 5, and flows into the section 1A from the lower end of the flow guide plate 5 to form an upward flow again. Carrier 4
Is divided into two sections 1A along the circulating flow of the water 3 to be treated.
Circulate 1B. As a result, the water to be treated 3 is biologically treated. The treated water 3 is discharged from the outflow pipe 9 via the screen 8.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、従来の
好気性処理槽は、散気装置６の下方において循環流の偏
りが生じ、流速の殆ど得られない領域が発生する欠点が
あった。例えば、処理槽１のコーナー部１Ｃでは、循環
流の流速が殆ど得られず、担体４が次第に堆積する。こ
の結果、堆積した担体４に酸素を供給できなくなるとと
もに、堆積した担体４と被処理水との接触効率が低下す
るので、微生物によるＢＯＤや窒素の処理性能が低下す
る問題があった。However, the conventional aerobic treatment tank has a drawback in that the circulating flow is biased below the diffuser 6 and a region where the flow velocity is hardly obtained is generated. For example, at the corner 1C of the processing tank 1, almost no flow velocity of the circulation flow is obtained, and the carrier 4 is gradually deposited. As a result, oxygen cannot be supplied to the deposited carrier 4 and the contact efficiency between the deposited carrier 4 and the water to be treated is reduced, so that there is a problem that the performance of treating BOD and nitrogen by microorganisms is reduced.
【０００６】本発明はこのような事情に鑑みて成された
もので、担体の堆積に伴う処理性能の低下を防止できる
好気性処理槽を提供することを目的とする。The present invention has been made in view of such circumstances, and an object of the present invention is to provide an aerobic treatment tank capable of preventing a decrease in treatment performance due to carrier deposition.
【０００７】[0007]
【課題を解決するための手段】本発明は前記目的を達成
するために、微生物を担持した担体によって被処理水を
好気的に処理する処理槽であって、該処理槽内を上下端
に開口を有する導流板で縦方向に区分するとともに、区
分された一方の区画に散気装置を配置し、該散気装置か
らのエアによるエアリフト作用により前記一方の区画と
他方の区画との間を循環する循環流を形成し、該循環流
によって前記担体を流動状態で前記被処理水に接触させ
る好気性処理槽において、前記散気装置の下方に、前記
循環流を槽底コーナー部に導く整流板を設けたことを特
徴としている。In order to achieve the above object, the present invention provides a treatment tank for aerobically treating water to be treated with a carrier carrying microorganisms, wherein the inside of the treatment tank is arranged at upper and lower ends. Along with the flow guide plate having an opening, the air diffusion device is arranged in one of the divided sections, and the air is lifted by the air from the air diffusion apparatus, so that the air is diffused between the one section and the other section. In the aerobic treatment tank in which the carrier is brought into contact with the water to be treated in a flowing state by the circulating flow, the circulating flow is guided to the bottom of the tank below the aeration device. It is characterized in that a current plate is provided.
【０００８】本発明によれば、整流板によって循環流を
槽底コーナー部に導くようにしたので、担体が堆積する
ことを防止でき、微生物による処理性能が向上する。According to the present invention, since the circulating flow is guided to the corner of the bottom of the tank by the flow regulating plate, the accumulation of the carrier can be prevented, and the performance of treating microorganisms is improved.
【０００９】[0009]
【発明の実施の形態】以下添付図面に従って、本発明に
係る好気性処理槽の好ましい実施の形態について詳説す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an aerobic treatment tank according to the present invention will be described below in detail with reference to the accompanying drawings.
【００１０】図１は、本発明に係る好気性処理槽の実施
の形態を示す全体構成図である。FIG. 1 is an overall configuration diagram showing an embodiment of an aerobic treatment tank according to the present invention.
【００１１】同図に示すように、処理槽１０には、流入
管１２が接続され、該流入管１２を介して供給された被
処理水１４が貯留される。この被処理水１４には、密度
が水より数％程度大きい担体１６、１６…が投入され、
該担体１６には、被処理水１４を生物学的に処理する微
生物が固定化されている。また、処理槽１０には、スク
リーン１８を介して流出管２０が連通されており、被処
理水１４が流出管２０から排出されるとともに、担体１
６の流出がスクリーン１８によって防止される。As shown in FIG. 1, an inflow pipe 12 is connected to the treatment tank 10, and water 14 to be treated supplied through the inflow pipe 12 is stored. Carriers 16, 16,... Having a density about several percent higher than water are introduced into the water to be treated 14,
Microorganisms for biologically treating the water to be treated 14 are immobilized on the carrier 16. An outflow pipe 20 is connected to the treatment tank 10 via a screen 18 so that the water 14 to be treated is discharged from the outflow pipe 20 and the carrier 1
The outflow of 6 is prevented by the screen 18.
【００１２】処理槽１０の中央部には、導流板２２が略
鉛直に設けられ、該導流板２２によって、処理槽１０の
内部が二つの区画１０Ａ、１０Ｂに分けられる。導流板
２２の上端及び下端には、開口が形成されており、この
開口を介して被処理水１４及び担体１６が二つの区画１
０Ａ、１０Ｂを流動する。At the center of the processing tank 10, a flow guide plate 22 is provided substantially vertically, and the inside of the processing tank 10 is divided into two sections 10A and 10B by the flow guide plate 22. Openings are formed at the upper and lower ends of the flow guide plate 22, through which the water 14 to be treated and the carrier 16 are divided into two sections 1.
Flow 0A, 10B.
【００１３】区画１０Ａには、散気装置２４が配設され
ている。この散気装置２４は、空気管２６に連通されて
おり、該空気管２６から空気が供給されると、この空気
を被処理水１４中に散気する。An air diffuser 24 is provided in the section 10A. The air diffuser 24 is communicated with an air pipe 26. When air is supplied from the air pipe 26, the air diffuses into the water 14 to be treated.
【００１４】散気装置２４の下方には、整流板２８が設
けられている。整流板２８は、被処理水１４の循環流が
衝突しやすい位置、例えば、導流板２２の下端と略同じ
高さに配設され、その上端が導流板２２側に傾斜して設
置される。また、整流板２８は、その上端と導流板２２
との間に所定の隙間Ｗ１を形成するとともに、その下端
と処理槽１０の底との間に所定の隙間Ｗ２を形成するよ
うに設けられる。ここで、所定の隙間Ｗ１、Ｗ２は、処
理槽１０の大きさや散気装置２４の位置によって適宜決
定される値であり、隙間Ｗ１は、整流板２８の上に担体
１６が堆積しないような値に設定される。また、隙間Ｗ
２は、担体１６を流動させる流速が得られる大きさで、
且つ、担体１６によって閉塞しない大きさに設定され
る。A current plate 28 is provided below the air diffuser 24. The flow straightening plate 28 is disposed at a position where the circulating flow of the water 14 to be treated is likely to collide, for example, at substantially the same height as the lower end of the flow guide plate 22, and the upper end thereof is installed inclined toward the flow guide plate 22. You. In addition, the current plate 28 is connected to the upper end thereof and the flow guide plate 22.
Are formed so as to form a predetermined gap W1 between the lower end of the processing tank 10 and a predetermined gap W2 between the lower end thereof and the bottom of the processing tank 10. Here, the predetermined gaps W1 and W2 are values appropriately determined according to the size of the processing tank 10 and the position of the air diffuser 24. Is set to Also, the gap W
2 is a size capable of obtaining a flow rate at which the carrier 16 flows,
In addition, the size is set so as not to be blocked by the carrier 16.
【００１５】次に上記の如く構成された好気性処理槽の
作用について説明する。Next, the operation of the aerobic treatment tank configured as described above will be described.
【００１６】散気装置２４から被処理水１４中に散気す
ると、担体１６に固定化された微生物に酸素が供給され
るとともに、散気によって生じた気泡が上昇し、区画１
０Ａに被処理水１４の上昇流が形成される。区画１０Ａ
を上昇した被処理水１４は、導流板２２の上端を越えて
区画１０Ｂに下降流を形成し、さらに、導流板２２の下
端を潜って区画１０Ａに流入する。これにより、区画１
０Ａと区画１０Ｂを循環する被処理水１４の循環流が形
成される。担体１６は、この循環流にのって流動しなが
ら、被処理水１４を生物学的に処理する。処理された被
処理水１４は、スクリーン１８を介して流出管２０から
流出される。When air is diffused from the air diffuser 24 into the water 14 to be treated, oxygen is supplied to the microorganisms immobilized on the carrier 16, and bubbles generated by the air diffusion rise, and
An upward flow of the water to be treated 14 is formed at 0A. Section 10A
Is formed in the section 10B over the upper end of the flow guide plate 22, and flows into the section 10A below the lower end of the flow guide plate 22. Thereby, section 1
A circulating flow of the water to be treated 14 circulating in the section 0A and the section 10B is formed. The carrier 16 biologically treats the water 14 to be treated while flowing along the circulation flow. The treated water 14 flows out of the outflow pipe 20 via the screen 18.
【００１７】ところで、導流板２２の下端を潜って区画
１０Ｂから区画１０Ａに流入する被処理水１４の循環流
は、整流板２８に衝突することによって、図２に示すよ
うに、隙間Ｗ１を通って散気装置２４に直接向かう分流
Ａと、隙間Ｗ２を通って処理槽１０のコーナー部１０Ｃ
から散気装置２４に向かう分流Ｂとに別れる。これによ
り、区画１０Ａを流れる循環流の偏りが抑制され、コー
ナー部１０Ｃにも、流速の大きい循環流が与えられる。
したがって、担体１６は、堆積することなく、処理槽１
０内を流動するので、処理槽１０の内部における微生物
濃度が均一化される。By the way, the circulating flow of the water to be treated 14 flowing from the section 10B into the section 10A under the lower end of the flow guide plate 22 collides with the rectifying plate 28, thereby forming a gap W1 as shown in FIG. The diversion A directly passing through the air diffuser 24 through the air passage 24, and the corner 10C of the processing tank 10 through the gap W2.
From the air flow to the air diffuser 24. Thereby, the bias of the circulating flow flowing through the section 10A is suppressed, and the circulating flow having a high flow velocity is also provided to the corner 10C.
Therefore, the carrier 16 is deposited on the processing tank 1 without being deposited.
Since the fluid flows through the inside of the treatment tank 10, the concentration of microorganisms in the processing tank 10 is uniformed.
【００１８】このように本実施の形態の好気性処理槽に
よれば、散気装置２４の下方に整流板２８を設けること
によって、循環流の偏りを防止できるので、処理槽１０
内の微生物濃度を均一化でき、微生物による処理性能が
向上する。As described above, according to the aerobic treatment tank of the present embodiment, since the rectifying plate 28 is provided below the air diffuser 24, the bias of the circulating flow can be prevented.
The concentration of microorganisms in the inside can be made uniform, and the processing performance by microorganisms is improved.
【００１９】また、上述した実施の形態では、整流板２
８を傾けて設置したので、整流板２８の上に担体１６が
堆積しにくく、担体１６を効率良く循環させることがで
きる。In the above-described embodiment, the current plate 2
Since the carrier 8 is inclined, the carrier 16 is not easily deposited on the current plate 28, and the carrier 16 can be efficiently circulated.
【００２０】なお、整流板２８の形状は、上述した実施
の形態に限定されるものではなく、被処理水１４の循環
流の偏りを抑制するものであればよい。例えば、図２に
示した整流板２８を、鉛直、或いは水平に設置してもよ
い。また、図３に示すように、循環流の流れ方向に湾曲
した整流板３０を設けてもよい。この場合には、整流板
３０の抵抗が小さくなるので、少ない散気量で効率良く
被処理水１４を循環させることができるとともに、強度
の小さい整流板３０を用いることができる。The shape of the current plate 28 is not limited to the above-described embodiment, but may be any shape as long as it suppresses the bias of the circulating flow of the water 14 to be treated. For example, the current plate 28 shown in FIG. 2 may be installed vertically or horizontally. Further, as shown in FIG. 3, a flow straightening plate 30 curved in the flow direction of the circulating flow may be provided. In this case, since the resistance of the current plate 30 is reduced, the water 14 to be treated can be efficiently circulated with a small amount of air diffusion, and the current plate 30 having a small strength can be used.
【００２１】また、整流板２８や整流板３０の個数は、
一つに限定するものではなく、複数であってもよい。例
えば、図４には、３個の整流板３２、３３、３４が設置
されている。整流板３２〜３４はそれぞれ、上端が導流
板２２側に傾斜して配置されるとともに、各整流板３２
〜３４は、所定の間隔をもって配置される。さらに、整
流板３３の下端は、整流板３２の下端よりも低く配置さ
れ、整流板３４の下端は、整流板３３の下端よりも低く
配置される。したがって、区画１０Ｂから区画１０Ａに
流入した循環流は、各整流板３２〜３４に衝突して分流
され、各整流板３２〜３４の間、又は、導流板２２に沿
って、或いは、処理槽１０のコーナー部１０Ｃに沿って
流れる。これにより、区画１０Ａに略均一な流速の循環
流が形成される。The number of the current plates 28 and 30 is as follows.
The number is not limited to one and may be plural. For example, in FIG. 4, three current plates 32, 33, and 34 are provided. Each of the rectifying plates 32 to 34 is disposed so that the upper end is inclined toward the flow guide plate 22, and
Are arranged at predetermined intervals. Further, the lower end of the current plate 33 is arranged lower than the lower end of the current plate 32, and the lower end of the current plate 34 is arranged lower than the lower end of the current plate 33. Therefore, the circulating flow that has flowed into the section 10A from the section 10B collides with each of the straightening plates 32 to 34 and is divided, and is divided between the straightening plates 32 to 34, along the flow guide plate 22, or in the processing tank. It flows along the 10 corners 10C. Thereby, a circulating flow having a substantially uniform flow rate is formed in the section 10A.
【００２２】また、上述した実施の形態は、導流板２２
によって処理槽１０を二つの区画１０Ａ、１０Ｂに区画
したが、三つ以上の区画に分けた場合や、区分けしない
場合にも適用することができる。In the above-described embodiment, the flow guide plate 22
Although the processing tank 10 is divided into two sections 10A and 10B by the above, the present invention can be applied to a case where the processing tank 10 is divided into three or more sections or a case where no division is performed.
【００２３】[0023]
【発明の効果】以上説明したように本発明に係る好気性
処理槽によれば、整流板によって槽底コーナー部にも循
環流を導くようにしたので、担体の堆積を防止すること
ができ、微生物による処理性能を向上させることができ
る。As described above, according to the aerobic treatment tank of the present invention, since the circulating flow is guided to the corner of the tank bottom by the rectifying plate, the accumulation of the carrier can be prevented. The processing performance by microorganisms can be improved.
【図１】本発明に係る好気性処理槽の全体構成を示す側
面断面図FIG. 1 is a side cross-sectional view showing the overall configuration of an aerobic treatment tank according to the present invention.
【図２】図１の好気性処理槽の作用を示す説明図FIG. 2 is an explanatory view showing the operation of the aerobic treatment tank in FIG.
【図３】図２と異なる整流板を示す側面断面図FIG. 3 is a side sectional view showing a current plate different from FIG. 2;
【図４】図２と異なる整流板を示す側面断面図FIG. 4 is a side sectional view showing a current plate different from FIG. 2;
【図５】従来装置を示す側面断面図FIG. 5 is a side sectional view showing a conventional apparatus.
１０…処理槽、１０Ａ、１０Ｂ…区画、１２…流入管、
１４…被処理水、１６…担体、１８…スクリーン、２０
…流出管、２２…導流板、２４…散気装置、２８…整流
板10 ... treatment tank, 10A, 10B ... section, 12 ... inflow pipe,
14 ... water to be treated, 16 ... carrier, 18 ... screen, 20
... outflow pipe, 22 ... flow guide plate, 24 ... diffuser, 28 ... straightening plate
Claims (1)
好気的に処理する処理槽であって、該処理槽内を上下端
に開口を有する導流板で縦方向に区分するとともに、区
分された一方の区画に散気装置を配置し、該散気装置か
らのエアによるエアリフト作用により前記一方の区画と
他方の区画との間を循環する循環流を形成し、該循環流
によって前記担体を流動状態で前記被処理水に接触させ
る好気性処理槽において、 前記散気装置の下方に、前記循環流を槽底コーナー部に
導く整流板を設けたことを特徴とする好気性処理槽。1. A treatment tank for aerobically treating water to be treated with a carrier carrying microorganisms, wherein the inside of the treatment tank is vertically divided by a flow guide plate having openings at upper and lower ends. A diffuser is arranged in one of the divided sections, and a circulating flow circulating between the one section and the other section is formed by an air lift action by air from the diffuser, and the carrier is formed by the circulating flow. An aerobic treatment tank that contacts the treated water in a fluidized state, wherein a rectifying plate for guiding the circulating flow to a tank bottom corner is provided below the air diffuser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000267905A JP2002079283A (en) | 2000-09-05 | 2000-09-05 | Aerobic treatment tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000267905A JP2002079283A (en) | 2000-09-05 | 2000-09-05 | Aerobic treatment tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002079283A true JP2002079283A (en) | 2002-03-19 |
Family
ID=18754744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000267905A Pending JP2002079283A (en) | 2000-09-05 | 2000-09-05 | Aerobic treatment tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002079283A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006053402A1 (en) * | 2004-11-22 | 2006-05-26 | Nubian Water Systems Pty Limited | Waste water treatment process system |
| KR100835844B1 (en) * | 2006-03-16 | 2008-06-09 | (주)오리코스포텍 | manufacture method of recyclable shock-absorbing popcorn- stuffed packingenvironmently friendly material |
| US7419594B2 (en) | 2003-10-09 | 2008-09-02 | Shaw Environmental & Infrastructure, Inc. | Apparatus and method for controlling biomass growth in suspended carrier bioreactor |
| KR101444791B1 (en) * | 2014-03-31 | 2014-09-26 | 성지환경기술(주) | wastewater treatment system |
-
2000
- 2000-09-05 JP JP2000267905A patent/JP2002079283A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7419594B2 (en) | 2003-10-09 | 2008-09-02 | Shaw Environmental & Infrastructure, Inc. | Apparatus and method for controlling biomass growth in suspended carrier bioreactor |
| WO2006053402A1 (en) * | 2004-11-22 | 2006-05-26 | Nubian Water Systems Pty Limited | Waste water treatment process system |
| US7785469B2 (en) | 2004-11-22 | 2010-08-31 | Nubian Water Systems Pty Ltd | Waste water treatment process system |
| GB2425305B (en) * | 2005-04-15 | 2009-01-14 | Shaw Environmental & Infrastru | Apparatus and method for controlling biomass growth in suspended carrier bioreactor |
| KR100835844B1 (en) * | 2006-03-16 | 2008-06-09 | (주)오리코스포텍 | manufacture method of recyclable shock-absorbing popcorn- stuffed packingenvironmently friendly material |
| KR101444791B1 (en) * | 2014-03-31 | 2014-09-26 | 성지환경기술(주) | wastewater treatment system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3867481B2 (en) | Immersion flat membrane separator | |
| JP2002079283A (en) | Aerobic treatment tank | |
| US4203841A (en) | Apparatus for high-efficient microbiological oxidation treatment | |
| JP7132682B2 (en) | Sewage treatment equipment and sewage treatment method | |
| JP4257024B2 (en) | Nitrification carrier circulation method in deep tank aeration tank | |
| JP3373015B2 (en) | Wastewater nitrification denitrification treatment equipment | |
| JP3150530B2 (en) | Biological nitrogen removal equipment | |
| JP2019076887A (en) | Waste water treatment apparatus and waste water treatment method | |
| JP2504248B2 (en) | Sewage treatment equipment | |
| JPS6223596Y2 (en) | ||
| JP2000140873A (en) | Aerobic treating tank and sewage treating method using the same | |
| JPH03213197A (en) | Device for treating putrescible waste liquor | |
| JPH04247295A (en) | Biological reaction chamber | |
| JP4994349B2 (en) | Nitrification carrier circulation method in deep tank aeration tank | |
| JP2004041853A (en) | Waste water treatment equipment | |
| JP3049701B2 (en) | Nitrification / denitrification equipment | |
| JPH10165984A (en) | Nitrogen removing apparatus | |
| JP3732743B2 (en) | Nitrogen-containing wastewater nitrification denitrification method | |
| KR20030031730A (en) | Apparatus for biological treating waste water using carriers of waste tires | |
| JPH07163994A (en) | Biological treating device of sewage | |
| JPH10146596A (en) | Nitrogen removing device | |
| JP3685236B2 (en) | Aeration tank | |
| WO2022270447A1 (en) | Wastewater treatment device and wastewater treatment method | |
| JP2023008037A (en) | Wastewater treatment apparatus and wastewater treatment method | |
| JP2001113295A (en) | Aerobic treatment tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040929 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20041012 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050301 |