SS accumulation prevention type aerobic treatment tank and sewage purification tank

摘要

PPROBLEM TO BE SOLVED: To provide an aerobic treatment tank of a structure adapted so that a carrier outflow prevention member (screen) disposed on the lower opening of a liquid transfer pipe may be scarcely blocked, and sludge may not be deposited on the bottom of the pipe. PSOLUTION: The aerobic treatment tank 10 for a septic tank is structured by filling the tank with a flowable carrier 3, vertically forming a liquid transfer pipe 8 that transfers the treated liquid to the next tank on that side of the tank 10 which is near to the next tank, forming an aerating pipe 4 that raises a liquid swirl by the discharged air on the bottom of the tank 10, forming an opening nearly vertical to the direction of the swirl on the lower side wall of the pipe 8, and providing the opening 6 with carrier outflow preventive members 7c and 7d permeable to the liquid but impermeable to the flowable carrier 3. PCOPYRIGHT: (C)2005,JPO&NCIPI