BNR공정 무산소 조건에서 인 및 질소 동시 제거

Abstract

A batch type experiment was conducted to test the conditions for simultaneous phosphorus release and uptake, and denitrification, taking place in one process. In the result of batch-type experiment, simultaneous reactions of phosphorus release and uptake, and also denitrification were observed under anoxic condition with high organic and nitrate loading. However the rate and the degree of P release were lower than that occurred under anaerobic condition.The experimental results from batch test was applied to the biological phosphorus removal metabolism. In the presence of high organic and nitrate nitrogen load, the part of NADH2 from TCA cycle was used for PHA production, and the other part used nitrogen nitrate as electron acceptor to produce ATP, thus the extra ATP production resulted in the decrease of polyphosphate cleavage. Therefore, the rate and degree of phosphorus release and uptake under anoxic condition may be less than that in anaerobic condition.In the lack of external organic carbon under anoxic condition, PHA as internal carbon source was used for denitrification and ATP production. As a result, theoretical biological metabolism can properly explain the possibility for simultaneous reactions of denitrification and luxury uptake under anoxic condition.