Aerobic treatment tank for sewage aerobic treatment tank and aerobic treatment tank for sewage equipped with aeration apparatus

摘要

An object of the present invention is to provide an aerobic treatment tank for aerobic treatment tanks capable of preventing a decrease in treatment performance due to non-uniformity in carrier concentration distribution and arrangement of a device that cannot exhibit carrier functions, and an aerobic treatment tank for sewage having the aeration device. .;In the aeration apparatus 10 provided in the aerobic treatment tank 1 of wastewater which has the carrier 2 which immobilized the microorganisms held in the suspended state, the aeration apparatus 10 is in the casing 14 and the casing 14. The impeller 17 provided in the flow path of the formed to-be-processed liquid, Comprising: The clearance C between the blade | wing part 17a of the impeller 17 and the casing 14 which the blade | wing part 17a opposes is supported by a carrier ( It was set larger than the maximum diameter or the maximum dimension of 2).