垂直流微电解耦合人工湿地强化处理生活污水的研究

比较了普通垂直流人工湿地、上升垂直流微电解耦合人工湿地和复合垂直流微电解耦合人工湿地处理生活污水的效果。结果表明,两种微电解耦合人工湿地的启动时间比普通垂直流人工湿地缩短近一半。3种人工湿地对氨氮的去除率无显著差异。对COD和总磷的去除率大小均表现为:复合垂直流微电解耦合人工湿地>上升垂直流微电解耦合人工湿地>普通垂直流人工湿地。3种人工湿地对COD和总磷的去除率随水力停留时间(HRT)的延长而升高。HRT为3d时,上升垂直流微电解耦合人工湿地和复合垂直流微电解耦合人工湿地的出水COD平均质量浓度分别为29.06、19.86mg/L,总磷分别为0.46、0.39mg/L,均达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A排放要求。由于复合垂直流微电解耦合人工湿地结构复杂、造价高,相比上升垂直流微电解耦合人工湿地对COD和总磷的去除率提高又不明显,故推荐使用上升垂直流微电解耦合人工湿地。

Micro-electrolysis combined vertical flow constructed wetland to enhance domestic wastewater treatment

The effects of normal vertical flow constructed wetland,upflow vertical flow micro-electrolysis constructed wetland and composite vertical flow micro-electrolysis constructed wetland on domestic wastewater were compared.Results showed that the start-up time of the two micro-electrolysis constructed wetlands shortened about one half compared with that of normal vertical flow constructed wetland.All the 3 constructed wetlands had little difference to remove ammonia nitrogen.However,for COD and TP,the removal rate showed composite vertical flow micro-electrolysis constructed wetland >upflow vertical flow micro-electrolysis constructed wetland >normal vertical flow constructed wetland.COD and TP removal rates of the 3 constructed wetlands all increased with hydraulic retention time(HRT).When HRT was 3 d,effluent mass concentrations of COD for upflow vertical flow micro-electrolysis constructed wetland and composite vertical flow micro-electrolysis constructed wetland were 29.06 and 19.86 mg/L,and that of TP were 0.46 and 0.39 mg/L,meeting the class 1A of“Discharge standard of pollutants for municipal wastewater treatment plant”(GB 18918-2002).Since the composite vertical flow micro-electrolysis constructed wetland had more complex structure and needed more management,but contributed little to remove COD and TP,therefore,the upflow vertical flow micro-electrolysis constructed wetland was recommended.