| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a solid-liquid separation method for activated sludge treatment water, which can ensure and maintain a high and uniform filtration flux and a low and uniform filtrate water turbidity, and to provide its apparatus. <P>SOLUTION: In the solid-liquid separation method and apparatus, water to be treated is introduced into an activated sludge treatment bioreaction tank. A sludge mixed liquid in the bioreaction tank is introduced into a filtration separation tank, in which a plurality of filtration modules are provided in an immersed state, to obtain filtrate water from the filtration modules by water head. The sludge mixed liquid after the filtration is returned to the bioreaction tank. A partition wall is provided between the filtration modules within the filtration separation tank. An aeration tube is provided on the lower part of each of the filtration modules. In the filtration, while obtaining filtrate water from filtration modules on both sides with the partition wall interposed in between, after air flow into the lower aeration tube in one of the filtration modules with the partition wall interposed in between, the air flow is carried out for the other aeration tube. The air flow for the aeration tubes in the filtration modules is changed and alternately carried out. In the washing of the filtration module, the filtration is stopped. The air washing of the filtration modules are alternately carried out for both the filtration modules with the partition wall interposed in between every predetermined time. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
