| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating organic waste water, wherein the generation of surplus sludge itself can be remarkably suppressed in a biological treatment method for organic waste water by an anaerobic/aerobic process or an anaerobic/non-oxygen/aerobic process. SOLUTION: In the method for subjecting organic waste water to biological treatment using activated sludge, biological treatment tanks arranged in the order of an anaerobic tank/an aerobic tank or an anaerobic tank/a non-oxygen tank/an aerobic tank are provided, the water to be treated is introduced into the anaerobic tank and is successively subjected to anaerobic treatment/aerobic treatment or anaerobic treatment/non-oxygen treatment/aerobic treatment, further, the treated water and sludge are separated by a solid-liquid separation apparatus provided at the poststage of the aerobic tank, and the separated sludge is circulated to the anaerobic tank and is repeatedly exposed to an anaerobic state and an aerobic state, so as to obtain the sludge in which bacteria of Bacillus are priority species. COPYRIGHT: (C)2007,JPO&INPIT
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