【発明の詳細な説明】 産業上の利用分野 本発明は流入量の不規則な汚水を処理する汚水処理装
置の運転方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for operating a sewage treatment apparatus for treating sewage having an irregular inflow.
従来の技術 従来、流入量の不規則な汚水を処理する場合には、流
入する汚水を一旦流量調整槽に貯留した後に、一定量ず
つ曝気槽に供給している。また、曝気槽において浸漬型
の膜分離装置を使用する場合には、分離膜の表面に付着
するケーキ層の堆積を防止するために膜分離装置を間欠
運転している。つまり、膜分離装置の分離膜の膜面は、
エアレーションにより生じる上昇攪拌流によって常に洗
浄されているが、膜分離装置を休止させることにより、
洗浄効果が高まるとともに、分離膜の弛緩によりケーキ
層が剥がれ易くなり、しかも間欠運転時におけるケーキ
層の堆積量が連続運転時に較べて少ないのでより剥離し
易いものとなる。2. Description of the Related Art Conventionally, when treating an inflowing sewage with an irregular flow rate, the inflowing sewage is temporarily stored in a flow rate adjusting tank and then supplied to the aeration tank in fixed amounts. Further, when the immersion type membrane separation device is used in the aeration tank, the membrane separation device is intermittently operated in order to prevent accumulation of a cake layer adhering to the surface of the separation membrane. That is, the membrane surface of the separation membrane of the membrane separation device is
It is always washed by the rising stirring flow generated by aeration, but by stopping the membrane separation device,
The cleaning effect is enhanced, the cake layer is easily peeled off due to the relaxation of the separation membrane, and the amount of the cake layer deposited during the intermittent operation is smaller than that during the continuous operation, so that the cake layer is more easily peeled off.
また、膜分離装置の膜面におけるケーキ層の形成を防
止するためには、間欠運転における運転時間が短いほ
ど、休止時間が長いほど良く、またフラックス（分離膜
の透過流束）を低く設定して運転するほど良い。In order to prevent the formation of a cake layer on the membrane surface of the membrane separation device, the shorter the operation time in intermittent operation, the longer the rest time, the better, and the flux (permeation flux of the separation membrane) set low. The more you drive, the better.
発明が解決しようとする課題 しかし、上記した従来の構成においては、曝気槽おけ
る膜分離装置の間欠運転は将来の見込み処理量、つまり
流量調整槽の貯留量に関係なく行われており、膜分離装
置の休止時間を延ばす時間的余裕が見込めるにも拘らず
過剰な運転を行わねばならない問題があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, the intermittent operation of the membrane separation device in the aeration tank is performed regardless of the future expected processing amount, that is, the storage amount of the flow rate adjusting tank, and the membrane separation is performed. There was a problem in that excessive operation had to be performed in spite of the fact that there was time to extend the downtime of the device.
本発明は上記課題を解決するもので、将来の見込処理
に応じて効率良くケーキ層の洗浄を行うことができる汚
水処理装置の運転方法に関する。The present invention solves the above problem and relates to a method for operating a sewage treatment apparatus that can efficiently wash a cake layer according to future prospective treatment.
課題を解決するための手段 上記課題を解決するために本発明は、被処理水を一旦
流量調整槽に貯留した後に一定流量ずつ曝気槽に供給
し、曝気槽において槽内の水位をほぼ一定に維持する状
態で曝気を行いながら膜分離装置を間欠運転して処理水
を取り出し、流量調整槽における水位の変動に応じて膜
分離装置の運転と休止の間欠時間を変更する構成とした
ものである。Means for Solving the Problems In order to solve the above problems, the present invention temporarily stores the water to be treated in the flow rate adjusting tank and then supplies the water to the aeration tank at a constant flow rate, and the water level in the tank is substantially constant in the aeration tank. While performing aeration while maintaining the state, the membrane separator is operated intermittently to take out the treated water, and the intermittent time of operation and suspension of the membrane separator is changed according to the fluctuation of the water level in the flow rate adjustment tank. .
また、被処理水を一旦流量調整槽に貯留した後に一定
流量ずつ曝気槽に供給し、曝気槽において槽内の水位を
ほぼ一定に維持する状態で曝気を行いながら膜分離装置
を間欠運転して処理水を取り出し、流量調整槽における
水位の変動に応じて膜分離装置のフラックスを変更する
構成としたものである。In addition, the water to be treated is temporarily stored in the flow rate adjusting tank and then supplied to the aeration tank at a constant flow rate, and the membrane separator is operated intermittently while performing aeration while maintaining the water level in the tank at a substantially constant level in the aeration tank. The treated water is taken out and the flux of the membrane separation device is changed according to the fluctuation of the water level in the flow rate adjusting tank.
作用 上記した構成により、流量調整槽における水位が低下
するにしたがって、つまり将来の見込み処理量が減少す
るにともなって、膜分離装置の間欠運転における運転時
間を短くする。Action With the above-described configuration, the operating time in the intermittent operation of the membrane separation device is shortened as the water level in the flow rate adjusting tank decreases, that is, as the future expected treatment amount decreases.
このとき、間欠運転のサイクル時間を一定として運転
時間を短くするとともに、休止時間を長くしても良く、
またサイクル時間自身を短くして運転時間短くするとと
もに、休止時間を一定にしてもよい。At this time, the operation time may be shortened while the cycle time of the intermittent operation is kept constant, and the rest time may be lengthened,
Further, the cycle time itself may be shortened to shorten the operation time, and the rest time may be made constant.
このことにより、過剰な運転を防止して見込み処理量
に応じて効率良く膜分離装置の運転が行われ、運転時に
おいて膜面に付着するケーキ層が少なくなって曝気によ
る膜面の洗浄が容易なものとなり、膜分離装置の分離膜
の延命が図られる。As a result, excessive operation can be prevented and the membrane separator can be operated efficiently according to the expected treatment amount, and the cake layer that adheres to the membrane surface during operation can be reduced and cleaning of the membrane surface by aeration is easy. And the life of the separation membrane of the membrane separation device is extended.
第２の構成によれば、流量調整槽における水位が低下
するにしたがって、つまり将来の見込み処理量が減少す
るにともなって、膜分離装置のフラックスを減少させる
ことにより、運転時に膜面に付着するケーキ層の形成が
抑制され、膜面の洗浄の容易化と分離膜の延命が図られ
る。According to the second configuration, as the water level in the flow rate adjusting tank decreases, that is, as the future expected treatment amount decreases, the flux of the membrane separation device is reduced, so that it adheres to the membrane surface during operation. The formation of the cake layer is suppressed, the cleaning of the membrane surface is facilitated, and the life of the separation membrane is extended.
実施例 以下本発明の一実施例を図面に基づいて説明する。第
１図において、流量調整槽１は汚水などの被処理水２の
水源に連通して設けられており、流量調整槽１の内部に
は第１レベル計３が設けられている。また、流量調整槽
１の底部近傍に一端が開口する送水管４が他端を曝気槽
５の内部で開口して設けられており、送水管４の途中に
は送液ポンプ６が介装されている。Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a flow rate adjusting tank 1 is provided in communication with a water source of treated water 2 such as dirty water, and a first level meter 3 is provided inside the flow rate adjusting tank 1. Further, a water supply pipe 4 having one end opened near the bottom of the flow rate adjusting tank 1 is provided with the other end opened inside the aeration tank 5, and a liquid feed pump 6 is interposed in the middle of the water supply pipe 4. ing.
そして、曝気槽５の内部には第２レベル計７が設けら
れるとともに、底部近傍には曝気用の散気管８がブロア
装置９に連通して配置されている。また、散気管８の上
方には膜分離装置10が被処理水２に浸漬して配置されて
おり、膜分離装置10の透過液流路側に連通して設けられ
た処理水取出管11の途中には吸引ポンプ12が介装されて
おり、吸引ポンプ12の下流側に位置して電動式の流量調
整弁13が介装されている。さらに、散気管８の下方には
攪拌翼14が配置されている。A second level meter 7 is provided inside the aeration tank 5, and an aeration diffuser 8 is provided near the bottom so as to communicate with a blower device 9. In addition, a membrane separation device 10 is disposed above the air diffuser pipe 8 so as to be immersed in the water to be treated 2, and in the middle of a treated water take-out pipe 11 provided in communication with the permeate flow path side of the membrane separation device 10. A suction pump 12 is installed in the pump, and an electric flow rate adjusting valve 13 is located downstream of the suction pump 12. Further, a stirring blade 14 is arranged below the air diffuser 8.
そして、第１レベル計３と第２レベル計７と送液ポン
プ６と吸引ポンプ12と流量調整弁13は制御装置15に電気
的に接続されている。The first level meter 3, the second level meter 7, the liquid feed pump 6, the suction pump 12, and the flow rate adjusting valve 13 are electrically connected to the control device 15.
以下、上記構成における作用について説明する。被処
理水２は一旦流量調整槽１に貯留された後に一定流量ず
つ曝気槽５に供給される。つまり、制御装置15は第２レ
ベル計７の下限値で送液ポンプ６を駆動させ、上限値で
停止させる。これにより、曝気槽５内の水位はほぼ一定
に維持され、槽内の被処理水２に対する酸素の溶解速度
はほぼ一定なものとなる。ただし、第１レベル計３の値
が下限値以上のときにおいてのみ送液ポンプ６の駆動が
可能である。The operation of the above configuration will be described below. The water 2 to be treated is once stored in the flow rate adjusting tank 1 and then supplied to the aeration tank 5 at a constant flow rate. That is, the controller 15 drives the liquid feed pump 6 at the lower limit of the second level meter 7 and stops it at the upper limit. As a result, the water level in the aeration tank 5 is maintained substantially constant, and the dissolution rate of oxygen in the water 2 to be treated in the tank becomes substantially constant. However, the liquid feed pump 6 can be driven only when the value of the first level meter 3 is equal to or more than the lower limit value.
そして、曝気槽５においては、ブロア装置９で供給さ
れる空気が散気管８から噴出し、被処理水２に対して曝
気が行われるとともに、空気のエアリフト作用によって
生じる上昇攪拌流によって膜分離装置10の分離膜の膜面
が洗浄される。また、膜分離装置10が吸引ポンプ12によ
る負圧を受けて間欠運転され、固液分離された被処理水
が処理水取出管11を通して外部に取り出される。Then, in the aeration tank 5, the air supplied by the blower device 9 is ejected from the air diffuser 8 to aerate the water 2 to be treated, and at the same time, the agitating flow generated by the air lift action of the air causes the membrane separation device. The membrane surface of 10 separation membranes is washed. Further, the membrane separation device 10 is intermittently operated by receiving a negative pressure from the suction pump 12, and the water to be treated which has been solid-liquid separated is taken out through the treated water take-out pipe 11.
このとき、制御装置15は第１レベル計３で検出される
水位に応じて膜分離装置10の運転と休止の間欠時間のパ
ターンを変更しながら吸引ポンプ12を間欠運転する。た
とえば、流量調整槽１における水位が低下するにしたが
って、つまり将来の見込み処理量が減少するにともなっ
て、吸引ポンプ12の間欠運転における運転時間を短くす
る。At this time, the control device 15 intermittently operates the suction pump 12 while changing the pattern of the intermittent time of the operation and the pause of the membrane separation device 10 according to the water level detected by the first level meter 3. For example, the operating time in the intermittent operation of the suction pump 12 is shortened as the water level in the flow rate adjusting tank 1 decreases, that is, as the future expected processing amount decreases.
このとき、第１表に示すように、間欠運転のサイクル
時間ｔを一定（この場合10分）として運転時間t1を短く
するとともに、休止時間t2を長くする。また、第２表に
示すように、サイクル時間ｔそれ自身を短くして運転時
間t1短くするとともに、休止時間t2を一定にしてもよ
い。At this time, as shown in Table 1, the cycle time t of intermittent operation is kept constant (10 minutes in this case), and the operation time t1 is shortened and the rest time t2 is lengthened. Further, as shown in Table 2, the cycle time t itself may be shortened to shorten the operation time t1 and the rest time t2 may be kept constant.
このことにより、過剰な運転を防止して見込み処理量
に応じて効率良く膜分離装置10の運転が行われ、運転時
において膜面に付着するケーキ層が少なくなって曝気に
よる膜面の洗浄が容易なものとなり、膜分離装置10の分
離膜の延命が図られることとなる。As a result, excessive operation is prevented and the membrane separation device 10 is efficiently operated according to the expected throughput, the cake layer adhering to the membrane surface during operation is reduced, and the membrane surface is cleaned by aeration. This facilitates the life of the separation membrane of the membrane separation device 10.
そして、流量調整槽１における水位が低下するにした
がって、つまり将来の見込み処理量が減少するにともな
って、流量調整弁13を制御装置15で操作し、第３表に示
すように、膜分離装置10のフラックスを減少させること
により、運転時に膜面に付着するケーキ層の形成が抑制
され、膜面の洗浄の容易化と分離膜の延命が図られる。Then, as the water level in the flow rate adjusting tank 1 decreases, that is, as the future expected treatment amount decreases, the flow rate adjusting valve 13 is operated by the control device 15, and as shown in Table 3, the membrane separation device is operated. By reducing the flux of 10, the formation of a cake layer adhering to the membrane surface during operation is suppressed, facilitating cleaning of the membrane surface and extending the life of the separation membrane.
発明の効果 以上述べたように本発明によれば、流量調整槽におけ
る水位の変動に伴って間欠運転の時間割合を変更するこ
とにより、過剰な運転を防止して見込み処理量に応じて
効率良く膜分離装置の運転を行うことができ、運転時に
おいて膜面に付着するケーキ層を減少させて曝気による
膜面の洗浄を容易なものとすることができ、膜分離装置
の分離膜の延命を図ることができる。 EFFECTS OF THE INVENTION As described above, according to the present invention, by changing the time ratio of the intermittent operation according to the fluctuation of the water level in the flow rate adjusting tank, it is possible to prevent excessive operation and efficiently perform the expected processing amount. The membrane separator can be operated, the cake layer adhering to the membrane surface during operation can be reduced, and cleaning of the membrane surface by aeration can be facilitated, and the life of the separation membrane of the membrane separator can be extended. Can be planned.
流量調整槽における水位の変動にともなって膜分離装
置のフラックスを減少させることにより、運転時に膜面
に付着するケーキ層の形成を抑制して、膜面の洗浄の容
易化と分離膜の延命を図ることができる。By reducing the flux of the membrane separation device along with the fluctuation of the water level in the flow rate adjustment tank, the formation of a cake layer that adheres to the membrane surface during operation is suppressed, facilitating cleaning of the membrane surface and prolonging the life of the separation membrane. Can be planned.
第１図は本発明の一実施例を示す汚水処理装置の全体構
成図である。 １…流量調整槽、２…被処理水、３…第１レベル計、５
…曝気槽、７…第２レベル計、10…膜分離装置、12…吸
引ポンプ。FIG. 1 is an overall configuration diagram of a sewage treatment apparatus showing an embodiment of the present invention. 1 ... Flow rate adjusting tank, 2 ... Treated water, 3 ... First level meter, 5
... Aeration tank, 7 ... Second level meter, 10 ... Membrane separation device, 12 ... Suction pump.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2320301AJPH0815597B2 (en) | 1990-11-22 | 1990-11-22 | Operating method of sewage treatment equipment |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2320301AJPH0815597B2 (en) | 1990-11-22 | 1990-11-22 | Operating method of sewage treatment equipment |
| Publication Number | Publication Date |
|---|---|
| JPH04190889A JPH04190889A (en) | 1992-07-09 |
| JPH0815597B2true JPH0815597B2 (en) | 1996-02-21 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2320301AExpired - Fee RelatedJPH0815597B2 (en) | 1990-11-22 | 1990-11-22 | Operating method of sewage treatment equipment |
| Country | Link |
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| JP (1) | JPH0815597B2 (en) |
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