| 摘要 |
PROBLEM TO BE SOLVED: To provide a septic tank in which problems of an ozone-used sterilizing method are solved, the maintenance of which is facilitated and in which the production of sterilization by-products such as trihalomethane and aldehydes is restrained and to provide a sewage treating method. SOLUTION: This septic tank is provided with an anaerobic treatment tank, an aerobic treatment tank, and a sterilization tank. The sterilization tank has a diffuser for discharging ozone-containing air and a transfer pipe for returning a part of the treated water sterilized in the sterilization tank to the anaerobic treatment tank. COPYRIGHT: (C)2005,JPO&NCIPI
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