| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a water treatment method and an apparatus wherein pollutants in waste water are efficiently removed by keeping the flow balance of a liquid mixture in a vessel to easily follow the the fluctuation of flow-in rate while holding the concentration of microorganisms (activated sludge) high to shorten the reaction time. <P>SOLUTION: The pollution components easily settled in a liquid to be treated is removed by treating the liquid to be treated in a batch type reaction vessel 1 by a batch type activated sludge process, supplying the low concentration liquid in the batch type reaction vessel 1 to a 2nd reaction vessel 9, treating the liquid mixture in the 2nd reaction vessel 9 by the membrane separation and the activated sludge process while circulating through a membrane separation vessel 16 and returning the liquid mixture in the 2nd reaction vessel 9 to the batch type reaction vessel 1 to prompt the biological reaction under high concentration of the activated sludge in the batch type reaction vessel 1. Hardly separating materials are membrane-separated in the membrane separation vessel 16 while decreasing the sludge concentration and suppressing the clogging of a membrane surface and hardly biologically decomposing material is decomposed under a high oxygen dissolving efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
