沸石处理高浓度氨氮废水亚硝化过程选择特性的初步研究

Zeolite media biolofical filte was used to discuss the stability of nitrozation under high concentration of ammonia and low concentration of DO respectively. The experimental results showed that the nitrite accumulation obtained from selective inhibition of high concentration free ammonia to nitrifier was unstable. DO became growth-limiting substrate, and nitrite accumulation could be realized at DO concentration of 0.5～1.5 mg/L,and in this level the ratio of nitrite to the sum of nitrite and nitrate is above 60% . When DO concentration is at 0.8 mg/l , the ratio of nitrite to the sum of nitrite and nitrate in the effluent was above 90%. Nitrosomonas dominated in the biofilm after accomplishment of nitrozation selection.