| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To quickly and easily reduce the load on a wastewater treatment facility when the organic substance concentration increases in a short time in raw water flowing into the wastewater treatment facility. <P>SOLUTION: The organic wastewater treatment facility includes a former stage solid-liquid separation device for separating solids from the raw water, a biological treatment tank for decomposing with activated sludge an organic substance in the water separated in the former stage solid-liquid separation device, and a latter stage solid-liquid separation device for separating the biologically treated liquid obtained in the biological treatment tank into sludge and treated liquid. When the organic substance concentration is over a prescribed value in the raw water, part of the excess sludge obtained in the latter stage solid-liquid separation device is mixed with the raw water before the inlet port of the former stage solid-liquid separation device. The soluble organic substance in the raw water is adsorbed and/or biologically decomposed by the mixed excess sludge. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
