某污水处理厂CAST工艺的脱氮性能评价OA北大核心CSTPCD

The nitrogen removal performance of CAST process in a wastewater treatment was evaluated by measuring the nitrogen components and suspended solids in the selective,anoxic and aerobic tanks,combined with the simultaneous nitrification and denitrification(SND)rate and feast-famine batch tests.The results showed that the contribution to total nitrogen(TN)removal through SND in aerobic tank and endogenous denitrification at sedimentation stage were dominated,which were(35.50±4.15)％and(62.86±4.13)％,respectively,while the denitrification in anoxic tank only accounted for(1.64±0.05)％.The Dissolved oxygen(DO)concentration had a great influence on the nitrogen removal performance of CAST process.The best nitrogen removal effect happened when the DO concentration in aerobic pool was controlled at 1～1.5 mg·L-1,and the TN removal rate of CAST process could reach 84.51％.The Feast-Famine batch tests proved that the maximum absorption of HAc occurred at the famine duration of 36 h,being up to 0.173 g HAc per 1 g VSS consumption.Based on this result,the optimal reflux ratio could be estimated to be 45％.