| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a membrane separation type activated sludge treatment method in which the sludge concentration in an aeration tank is maintained high without depending on the control of the amount of pulling out of a seed sludge and a surplus sludge, and stable film filter is performed. <P>SOLUTION: In the membrane separation type activated sludge treatment method in which organic matter containing wastewater (raw water) is introduced into an aeration tank A in the foremost step of aeration tanks A-C provided by two steps or more in series, an activated sludge treated water in the end step aeration tank C is introduced into an immersion membrane separation tank, the permeated water of the immersion membrane module in the immersion membrane separation tank is obtained as a treated water, and a concentrated sludge is sent back to the aeration tanks A-C; the aeration tank to which the sludge is sent back or the presence or absence of the sending back of the sludge is switched depending on the load of the raw water. <P>COPYRIGHT: (C)2013,JPO&INPIT |
