To provide an activated sludge treatment method for the treatment of organic wastewater that contains an ash content consisting of an inorganic fine particle or the like generated from a paper manufacturing plant or a pulp production factory.
The activated sludge treatment method is characterized as follows. In an activated sludge treatment process in which an activated sludge treatment suspension from an aeration tank is solid-liquid separated by a sedimentation tank, at least a portion of a settled sludge from the sedimentation tank is made to circulate to the aeration tank as a returned sludge (L5), and at least a portion (L5a) of the returned sludge is sent back to the aeration tank as a concentrated sludge (L5b) subjected to ash content removal and dehydration by a wire hydro extractor (3) having a wire mesh of at least 40 mesh and at most 100 mesh.
TANAKA ATSUSHI
MIYABAYASHI HIROKAZU
TANI SO
HIRAI SADAKI
Funakoshi Takuko
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