NON-AERATION NITRIFICATION METHOD OF SEWAGE WITH LOW CONCENTRATION OF AMMONIA

摘要

PURPOSE: A non-aeration nitrification method of sewage with low concentration of ammonia, which has much DO of sewage more than wasted oxygen by fixed bacteria in the reactor with aerating the sewage including low concentration of ammonia before flowing into the reactor, is provided to apply to the water treatment process in low class water works that need high removal velocity of ammonia or water treatment process in fish farm of circulating filtration system. CONSTITUTION: The method comprises a storage step(401) to store the sewage including ammonia(22a) in the storage tank(22); an aeration step(402) in which air supplied to the sewage in the storage tank regulates the DO between about 7 and 8 ppm and supplies the sewage to the reactor(20); a reaction step(403) to remove the ammonia present in the reactor(20) where nitrate bacteria(28) such as nitrosomonas and nitrobacter are present and the ratio of H/D(height/depth) is 3-5 and the residence time of the sewage is 0.02-0.2(hr) and concentration of the bacteria is 60-66% per unit volume.