廊道式人工湿地处理污水过程中氨氮的去除效果研究

Removal efficiency of ammonia nitrogen in wastewater by channel constructed wetland

通过廊道式人工湿地(CCW)的生产性试验工程,研究了该处理系统的性能及系统内部氨氮的变化规律。结果表明,CCW处理系统的去除效率高且稳定,氨氮的去除率平均为88%,质量去除率平均为(6.94±2.07)gN.m-2.d-1,系统内部第三单元的氨氮质量去除率最高;CCW处理系统的氨氮质量负荷率小于10 gN.m-2.d-1时,质量去除率与质量负荷率呈明显的线性相关,质量负荷率大于等于20 gN.m-2.d-1时,进水浓度和出水浓度之间呈明显线性相关;处理系统各处理单元及系统整体的体积去除率常数(Kv值)均大于其他湿地处理系统;CCW处理系统氨氮浓度变化与pH值的变化趋势并不一致。

The study was conducted to evaluate the system performance of channel conducted wetlands （CCW） to remove inorganic ammonittrn nitrogen （AN） and to discover the change rule of AN in system. The results show that CCW system has high AN removal efficiency, with average efficiencies of 88% and average mass removal rate of （6.94±2.07） gN·m^-2·d^-1, While the mass,removal rate of AN in the third unit was the highest. AN mass removal rate and mass loading rate （MLR） showed significantly linear correlation when AN MLR was lower than 10 gN·m^-2·d^-1. Yet influent and effluent concentration showed linear correlation significantly as AN MLR was higher than 20 gN·m^-2·d^-1. The Kv values of each unit and whole system were higher than those of other wetlands. The changes of AN concentration were not consistent with pH values in CCW.