SEWAGE TREATMENT APPARATUS AND OPERATION METHOD OF SEWAGE TREATMENT APPARATUS

摘要

PPROBLEM TO BE SOLVED: To provide a sewage treatment apparatus which keeps DO of a membrane separation tank a suitable value, controls generation of a causative agent of membrane fouling, and further maintains denitrification reaction in an anaerobic tank and phosphorous release reaction in an aerobic tank a good state. PSOLUTION: The sewage treatment apparatus includes an aerobic tank 3 which has an air diffuser 5 and aerobically treats a water to be treated by a microorganism, a membrane separation tank 4 which is arranged in the latter step of the aerobic tank 3 and has a membrane separation apparatus 6 for solid-liquid separating the water to be treated, and a first circulation passage 8 for making the water to be treated in the membrane separation tank 4 circulate to the aerobic tank 3, wherein the sewage treatment apparatus includes a first measuring apparatus 20 for measuring an indicator of the aerobic treatment in the membrane separation tank 4, and a first control apparatus 21 which adjusts a circulation amount of the water to be treated through the first circulation passage 8 based on a measured value by the first measuring apparatus 20. PCOPYRIGHT: (C)2010,JPO&INPIT