ANAEROBIC WASTE WATER TREATMENT APPARATUS

摘要

PURPOSE:To prevent the corrosion of the inner surface of a fermentation tank by providing a waste water circulation device to the fermentation tank and applying a flexible sheet to the upper part of the fermentation tank to hermetically close the opening part of said tank. CONSTITUTION:Valves 17, 22 are closed while a valve 20 is opened to operate a waste water supply pump and waste water is once stored between the edge part of a distributor 12 and an inner wall. This waste water flows in a fermentation tank 1 at a part inside the inner wall thereof through an inflow port to make the water level of the inner wall constant and is uniformly sprinkled on a carrier 2. Then, the valve 17 is opened and a circulation pump 11 is operated. The waste water in the vicinity of the bottom part in the fermentation tank 1 flows in circulation piping 8 from an inflow port 9 and flows out to the distribution 12 from an outflow port 10. The waste water uniformly sprinkled on the carrier 2 is uniformly brought into contact with anaerobic bacteria to enhance the treatment efficiency of waste water. By this method, manufacturing cost can be reduced.