JP3432363B2 - Sludge concentration method - Google Patents
Sludge concentration methodInfo
- Publication number
- JP3432363B2 JP3432363B2 JP18390096A JP18390096A JP3432363B2 JP 3432363 B2 JP3432363 B2 JP 3432363B2 JP 18390096 A JP18390096 A JP 18390096A JP 18390096 A JP18390096 A JP 18390096A JP 3432363 B2 JP3432363 B2 JP 3432363B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- membrane
- tank
- separation device
- membrane separation
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、廃水処理施設など
で発生した汚泥を濃縮する汚泥濃縮方法に関する。
【０００２】
【従来の技術】従来、廃水処理施設などで発生した汚泥
を濃縮する濃縮装置として、処理槽の内部に浸漬型膜分
離装置を設置したものがある。
【０００３】図２に示したように、膜分離装置１は、上
下が開口した箱枠状のケース２内の上部に平板状の膜カ
ートリッジ３を一定間隔で平行に配列し、膜カートリッ
ジ３の下方に曝気装置４を配設し、ケース２の上部に、
各膜カートリッジ３の膜透過液流路（図示せず）に連通
する集水管５を設けており、集水管５に連通して、膜透
過液導出管６を設けている。
【０００４】濃縮装置を運転する際には、処理槽の内部
に汚泥を投入し、膜透過液導出管６，集水管５を通じて
各膜カートリッジ３の膜透過液流路内に吸引圧を作用さ
せるなど、濾過膜３ａの両側に圧力差を生ぜしめること
により、各膜カートリッジ３の濾過膜３ａにおいて汚泥
を固液分離し、濾過膜３ａを透過して膜透過液流路（図
示せず）内に流入した膜透過液を集水管５，膜透過液導
出管６を通じて槽外へ導出し、濃縮汚泥を槽内に残留さ
せる。槽内の濃縮汚泥は、常時または間欠的に少量ずつ
引き抜くようにしている。
【０００５】図３は間欠的に汚泥を引き抜く運転を示
し、(a) 処理槽７の内部に上方より原汚泥を流入させ、
(b) 槽内底部に沈降した濃縮汚泥の一部を排出し、(c)
槽内の汚泥を膜分離装置１により濃縮することからなる
サイクルが繰り返される。
【０００６】
【発明が解決しようとする課題】しかしながら、上記し
たように濃縮汚泥を常時または間欠的に少量ずつ排出す
る運転を行う場合、槽内の汚泥濃度が常時高いため、膜
面にケーキ層が形成され易く、透過流束が低下するだけ
でなく、ケーキ層が肥厚した時には隣接する膜カートリ
ッジ間の間隙が閉塞されるので、定期的に膜カートリッ
ジを洗浄する必要がある。また、槽内底部の汚泥が嫌気
状態になる問題がある。
【０００７】本発明は上記問題を解決するもので、膜分
離装置におけるケーキ層の形成を防止できるとともに、
汚泥の嫌気化を防止できる汚泥濃縮方法を提供すること
を目的とするものである。
【０００８】
【課題を解決するための手段】上記問題を解決するため
に、本発明の請求項１記載の汚泥濃縮方法は、膜分離装
置を内部に設置した処理槽内に原汚泥を流入させる流入
工程と、槽内の汚泥を前記膜分離装置で固液分離するこ
とにより濃縮する濃縮工程と、前記濃縮工程において生
じる濃縮汚泥を全量排出する排出工程とを行い、排出工
程で濃縮汚泥を全量排出した後に流入工程で新たに処理
槽へ流入する原汚泥を曝気することにより膜分離装置の
膜面を洗浄するものである。
【０００９】請求項１記載の構成によれば、槽内の汚泥
を全量排出する工程を含んでいるため、膜分離装置にお
けるケーキ層の形成を抑制できるとともに、槽内底部の
汚泥の嫌気化を防止することができ、砂などが溜まるこ
ともない。流入工程と濃縮工程とを複数回行った後に排
出工程を行うようにすれば、処理効率を高められる。
【００１０】また、処理槽内に原汚泥が流入した状態で
膜面洗浄を行って、ケーキ層の肥厚を防止することがで
きるので、従来のように濃縮運転を停止して膜洗浄を行
う必要がない。
【００１１】
【発明の実施の形態】以下、本発明の一実施形態を図面
を参照しながら説明する。この実施形態において使用す
る濃縮装置は、前述したものと同様に処理槽の内部に膜
分離装置を設置して構成されているので、詳しい説明を
省略する。
【００１２】汚泥を濃縮する際には、図１に示したよう
に、(A) 処理槽７の内部に所定量まで原汚泥を流入さ
せ、(B) 槽内の汚泥を膜分離装置１で固液分離すること
により濃縮し、(A),(B) の工程を数回繰り返し、(C) 槽
内の濃縮汚泥を全量排出する。その後、(D) 膜が乾燥し
ないように槽内に速やかに原汚泥を流入させ、膜分離装
置１が原汚泥中に浸漬した状態で散気装置４により曝気
を行い、それにより生起される気液混合上昇流によって
膜分離装置１の膜面を洗浄する。
【００１３】その後、上記した方法を繰り返す。上記し
た方法によれば、槽内の汚泥が定期的に全量排出される
ので、膜面ケーキ層の形成が抑制されるとともに、槽内
底部の汚泥の嫌気化が防止され、底部に砂などが溜るこ
とも防止される。
【００１４】また、汚泥濃度の低い原汚泥中での膜面洗
浄により、膜面ケーキ層の肥厚が防止されるので、従来
のように定期的に処理を停止して膜洗浄を行う必要がな
い。なお、濃縮汚泥の全量排出を行う時期は、濃縮汚泥
の状態や膜分離装置の膜面の汚れ具合に基づき適宜決め
てもよい。ただしその場合も、汚泥が嫌気状態にならな
いようにする。
【００１５】使用する濃縮装置は、処理槽のできるだけ
底部にドレンを設けて、濃縮汚泥の全量排出を容易に行
え、汚泥が溜まらないようにするのが望ましく、また、
処理槽の真下に貯留槽を設けるなど、配管を短くするこ
とによって、ドレン以降の配管につまりが生じないよう
にするのが望ましい。
【００１６】
【発明の効果】以上のように本発明によれば、槽内の汚
泥を定期的に全量排出することにより、膜面ケーキ層の
形成や汚泥の嫌気化を抑制できる。また、汚泥濃度の低
い原汚泥中で膜面洗浄することで、膜面ケーキ層の肥厚
を防止することができ、従来のような膜のメンテナンス
が不要となる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for condensing sludge generated in a wastewater treatment facility or the like. 2. Description of the Related Art Conventionally, as a concentrating apparatus for condensing sludge generated in a wastewater treatment facility or the like, there is an apparatus provided with an immersion type membrane separation apparatus inside a treatment tank. As shown in FIG. 2, a membrane separation device 1 has a flat plate-like membrane cartridge 3 arranged in parallel at a predetermined interval on an upper portion of a box frame-shaped case 2 having an open top and bottom. The aeration device 4 is arranged below, and on the upper part of the case 2,
A water collection pipe 5 communicating with a membrane permeate flow path (not shown) of each membrane cartridge 3 is provided, and a membrane permeate outlet pipe 6 is provided in communication with the water collection pipe 5. When the concentrator is operated, sludge is introduced into the treatment tank, and suction pressure is applied to the membrane permeate flow passage of each membrane cartridge 3 through the membrane permeate outlet pipe 6 and the water collection pipe 5. For example, by generating a pressure difference on both sides of the filtration membrane 3a, the sludge is separated into solid and liquid at the filtration membrane 3a of each membrane cartridge 3, and is permeated through the filtration membrane 3a into a membrane permeated liquid flow path (not shown). The membrane permeated liquid flowing into the tank is led out of the tank through the water collecting pipe 5 and the membrane permeated liquid outlet pipe 6, and the concentrated sludge remains in the tank. The concentrated sludge in the tank is constantly or intermittently pulled out little by little. FIG. 3 shows an operation of intermittently extracting sludge. (A) Raw sludge is allowed to flow into the inside of the treatment tank 7 from above.
(b) Part of the concentrated sludge settled at the bottom of the tank is discharged, and (c)
The cycle consisting of concentrating the sludge in the tank by the membrane separation device 1 is repeated. [0006] However, when the operation of discharging the concentrated sludge constantly or intermittently little by little as described above is performed, since the sludge concentration in the tank is always high, the cake layer is formed on the membrane surface. Is not only easily formed, the permeation flux is reduced, but also when the cake layer is thickened, the gap between the adjacent membrane cartridges is closed, so that it is necessary to periodically clean the membrane cartridges. In addition, there is a problem that the sludge at the bottom of the tank becomes anaerobic. The present invention solves the above-mentioned problems, and can prevent the formation of a cake layer in a membrane separation device.
It is an object of the present invention to provide a sludge concentration method capable of preventing sludge anaerobic. [0008] In order to solve the above problems, the sludge concentration method according to the first aspect of the present invention allows raw sludge to flow into a treatment tank in which a membrane separation device is installed. and flow-in step, a concentration step of concentrating by solid-liquid separation of sludge in the tank with the membrane separation device, have row and a discharge step of totally drained concentrated sludge generated in the concentration step, the discharge Engineering
After the concentrated sludge has been completely discharged, it is newly treated in the inflow process
By aerating the raw sludge flowing into the tank,
This is for cleaning the film surface . According to the first aspect of the present invention, since the method includes the step of discharging the entire amount of sludge in the tank, the formation of a cake layer in the membrane separation device can be suppressed, and the anaerobicization of sludge at the bottom of the tank is prevented. It can be prevented and sand etc. do not accumulate. If the discharge step is performed after performing the inflow step and the concentration step a plurality of times, the processing efficiency can be increased. In addition, since the membrane surface can be washed while the raw sludge flows into the treatment tank to prevent the thickening of the cake layer, it is necessary to stop the concentration operation and perform the membrane washing as in the conventional case. There is no. An embodiment of the present invention will be described below with reference to the drawings. The concentrating device used in this embodiment is configured by installing a membrane separation device inside the treatment tank in the same manner as described above, and therefore detailed description is omitted. When the sludge is concentrated, as shown in FIG. 1, (A) the raw sludge flows into the treatment tank 7 to a predetermined amount, and (B) the sludge in the tank is separated by the membrane separation device 1. Concentrate by solid-liquid separation, repeat steps (A) and (B) several times, and (C) discharge all the concentrated sludge in the tank. Then, (D) the raw sludge is quickly flowed into the tank so that the membrane is not dried, and aeration is performed by the air diffuser 4 while the membrane separation device 1 is immersed in the raw sludge. The membrane surface of the membrane separation device 1 is washed by the liquid mixture rising flow. Thereafter, the above method is repeated. According to the above-described method, the entire amount of sludge in the tank is periodically discharged, so that the formation of a membrane surface cake layer is suppressed, the anaerobicization of sludge at the bottom of the tank is prevented, and sand or the like is formed at the bottom. Accumulation is also prevented. Further, since the membrane surface is washed in the raw sludge having a low sludge concentration, the thickening of the membrane surface cake layer is prevented, so that it is not necessary to periodically stop the treatment and carry out the membrane washing as in the prior art. . The timing of discharging the entire amount of the concentrated sludge may be appropriately determined based on the state of the concentrated sludge and the degree of contamination of the membrane surface of the membrane separation device. However, also in this case, the sludge should not become anaerobic. It is desirable that the concentrating device used is provided with a drain at the bottom of the treatment tank as much as possible, so that the entire amount of concentrated sludge can be easily discharged and sludge does not accumulate.
It is desirable that the piping after the drain is not clogged by shortening the piping such as providing a storage tank directly below the processing tank. As described above, according to the present invention, the formation of a cake layer on the membrane surface and the anaerobic treatment of sludge can be suppressed by periodically discharging the entire amount of sludge in the tank. Further, by cleaning the membrane surface in raw sludge having a low sludge concentration, the thickening of the membrane surface cake layer can be prevented, and the maintenance of the membrane as in the related art is not required.
【図面の簡単な説明】
【図１】本発明の一実施形態における汚泥濃縮方法を説
明するフローチャートである。
【図２】本発明および従来の汚泥濃縮方法に用いられる
膜分離装置の全体構成を示した一部破断図である。
【図３】従来の汚泥濃縮方法を説明するフローチャート
である。
【符号の説明】
１ 膜分離装置
４ 散気装置
７ 処理槽BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart illustrating a sludge concentration method according to an embodiment of the present invention. FIG. 2 is a partially broken view showing the entire configuration of a membrane separation device used in the present invention and a conventional sludge concentration method. FIG. 3 is a flowchart illustrating a conventional sludge concentration method. [Description of Signs] 1 Membrane separation device 4 Air diffuser 7 Processing tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山田 豊 大阪府大阪市浪速区敷津東一丁目２番47 号 株式会社クボタ内 (56)参考文献 特開 平６−91288（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 11/12 ZAB ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yutaka Yamada 2-47, Shizitsuhigashi 1-chome, Namiwa-ku, Osaka-shi, Osaka (56) References JP-A-6-91288 (JP, A) ( 58) Field surveyed (Int.Cl. 7 , DB name) C02F 11/12 ZAB
Claims (1)
原汚泥を流入させる流入工程と、槽内の汚泥を前記膜分
離装置で固液分離することにより濃縮する濃縮工程と、
前記濃縮工程において生じる濃縮汚泥を全量排出する排
出工程とを行い、排出工程で濃縮汚泥を全量排出した後
に流入工程で新たに処理槽へ流入する原汚泥を曝気する
ことにより膜分離装置の膜面を洗浄することを特徴とす
る汚泥濃縮方法。(57) [Claim 1] An inflow step of flowing raw sludge into a treatment tank having a membrane separation device installed therein, and solid-liquid separation of the sludge in the tank by the membrane separation device. A concentration step of concentrating by
There line and a discharge step of discharging the whole amount concentrated sludge generated in the concentration step, after the concentrated sludge was totally drained by discharging step
The raw sludge newly flowing into the treatment tank in the inflow process is aerated
A method for concentrating sludge, comprising washing a membrane surface of a membrane separation apparatus .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18390096A JP3432363B2 (en) | 1996-07-15 | 1996-07-15 | Sludge concentration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18390096A JP3432363B2 (en) | 1996-07-15 | 1996-07-15 | Sludge concentration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1028999A JPH1028999A (en) | 1998-02-03 |
| JP3432363B2 true JP3432363B2 (en) | 2003-08-04 |
Family
ID=16143783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18390096A Expired - Fee Related JP3432363B2 (en) | 1996-07-15 | 1996-07-15 | Sludge concentration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3432363B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8114293B2 (en) | 2003-10-29 | 2012-02-14 | Zenon Technology Partnership | Method of operating a water treatment plant with immersed membranes |
| US7879229B2 (en) | 2003-10-29 | 2011-02-01 | Zenon Technology Partnership | Water treatment plant with immersed membranes |
-
1996
- 1996-07-15 JP JP18390096A patent/JP3432363B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1028999A (en) | 1998-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4920990B2 (en) | Separation membrane cleaning method | |
| JPH09220569A (en) | Solid-liquid separator | |
| JP4267452B2 (en) | Dynamic filter module | |
| JP5324117B2 (en) | Water treatment facility having a diffuser and a membrane concentrator equipped with the diffuser | |
| JP3984145B2 (en) | Cleaning method for solid-liquid separator | |
| JP3432363B2 (en) | Sludge concentration method | |
| JPH10286444A (en) | Immersion type membrane filter device | |
| JP3281161B2 (en) | Water purification equipment | |
| JP4111579B2 (en) | Operation method and apparatus of organic sewage treatment apparatus | |
| KR101059956B1 (en) | Cleaner using ultrasonic wave and backflow of submerged flat membrane module for wastewater treatment | |
| JP3901771B2 (en) | Waste water treatment equipment | |
| JP3271882B2 (en) | Septic tank | |
| JP2000189764A (en) | Immersion-type membrane separator | |
| JPH11104684A (en) | Apparatus for treating oxidation ditch type activated sludge | |
| JPH0985242A (en) | Immersion type film separation device | |
| JP2000062833A (en) | Solid and liquid separating device | |
| JP3679528B2 (en) | Equipment for removing fines in sewage treatment facilities | |
| JP2000210540A (en) | Membrane filter apparatus | |
| JP3476365B2 (en) | Water intake equipment using filtration membrane | |
| JP3414609B2 (en) | Operating method of sewage treatment equipment | |
| JP2001170670A (en) | Aeration tank of membrane separation activated sludge system with thickening function | |
| JP2001062481A (en) | Treatment of concentrated sewage | |
| JPH10156375A (en) | Biological filter and sewage septic tank containing the filter | |
| JP2002177982A (en) | Cleaning method and equipment for filter element | |
| JP3797572B2 (en) | Cleaning wastewater treatment method in water purification facilities |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080523 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090523 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100523 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110523 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120523 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130523 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140523 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |