曝气生物滤池用于城市污水深度处理的最佳工艺条件研究

he two-stage biological aerated filter (BAF) process was employed for tertiary treatment of municipal wastewater. The effects of ammonia-nitrogen loading rate and gas/liquid ratio on the performance of the BAF are investigated. The results show that, under the conditions of the hydraulic loading is 5m3/(m2oh) and the best ammonia nitrogen removal rate, the optimal gas/liquid ratio is 3:1 and the influent ammonia-nitrogen loading rate ranged from 0.89 to 1.65 kg/(m3od). Under such operational condition, the average ammonia-nitrogen removal efficiency is 93.32%. While, the optimal gas/liquid ratio is 2:1 and the ammonia-nitrogen loading rate is 0.89 to 1.65kg/(m3od) for ensuring the best performances for COD, turbidity and ammonia-nitrogen removal. The average removal efficiency of ammonia-nitrogen is 84.38%. The optimal ammonia-nitrogen loading rate has been determined as 1.74 kg/(m3od) for achieving the effluent ammonia-nitrogen concentration less than 5mg/L under the operational condition using the hydraulic loading of 5 m3/(m2oh) and the gas/liquid ratio of 3:1.