AEROBIC TREATING METHOD FOR ORGANIC WASTE LIQUID

摘要

PURPOSE: To provide an aerobic treating method for organic waste liquid wherein sludge is solubilized and treated under mild conditions at a low cost and further excess sludge can be restrained from being produced without lowering load and treatment efficiency and production of excess sludge can be made zero in some cases. CONSTITUTION: Organic waste liquid 13 is introduced into a section 32 upstream of an aeration tank 11 which is divided by a partition plate 31, where the liquid 13 is mixed with activated sludge in the tank 11 and sludge to be returned 14 for an aerobic treatment, and a mixture in the section 32 is drawn out and the liquid 22 having been drawn out is fed into an ozone treatment tank 21 to ozonize the sludge so that the ozonized liquid 25 is returned to the downstream section 33 of the tank 11 and subjected to an aerobic treatment.