厌氧池-复合型人工湿地系统污水处理效果的季节变化

利用厌氧池-复合型人工湿地(AT-ICW)系统处理农村生活污水,探讨工艺系统不同季节对污水的处理效果。结果表明,该工艺系统春、夏、秋季对氨氮(NH4+-N)、总磷(TP)表现出稳定且较好的去除效果,去除率分别为92.8%～97.0%和56.4%～65.9%,冬季去除率相对较差,平均去除率分别为67.1%和42.5%。NO3--N的去除效果差,四季均出现积累,累积率达到71.5%～342.9%。系统春、夏季对总氮(TN)去除效果较好,去除率为57.3%～68.9%,秋、冬季去除效果相对较差,为24.5%～35.8%。系统夏季COD去除效果好,平均去除率达到78.3%,冬、春季去除效果较差,为37.8%～43.5%。各项污水排放指标均达到城镇污水处理厂污染物排放一级A类标准。AT-ICW系统不仅处理效果好,而且运行费用低,适用于农村分散型生活污水处理。

Seasonal variation in performances of anaerobic tank integrated constructed wetland system for sewage treatment

Seasonal performances of anaerobic tank-integrated constructed wetland(AT-ICW) system for rural domestic sewage treatment were investigated.Results showed that the system in spring,summer,autumn played a great role on the removal efficiency of ammonium(NH+4-N),total phosphorus(TP),and average removal rates were 92.8%~97.0% and 56.4%~65.9%,respectively,in contrast the removal efficiency in winter was a little low,and the average removal rates were 67.1% and 42.5%,respectively.The NO-3-N removal ability of the system was poor and appeared the accumulation with the average cumulative rate of 71.5%~342.9% during four seasons.The system could effectively reduce total nitrogen(TN) by 57.3%~68.9% in spring and summer and relatively low by 24.5%~35.8% in autumn and winter.The COD removal effect of the system in summer was good with the average removal rate of 78.3%,by contrast,winter and spring remove effect is poorer by 37.8%~43.5%.The effluent can meet Class A level one of national discharge standard of pollutant for municipal wastewater treatment plant.The AT-ICW system is not only effective on pollutant removal but also low cost of operation,so it is suitable for rural decentralized sewage treatment.