潜流湿地对农村生活污水中磷的净化作用

Removal of Phosphrous in Rural Domestic Wastewater by Subsurface Constructed Wetlands

分别以香根草、芦竹和灯心草为植物构建潜流人工湿地植物床,研究其对农村生活污水中磷的净化功能。设计正交试验,分析pH值、水力负荷、碳氮比和植物4个因素对潜流人工湿地处理农村生活污水中磷的去除率的影响。结果表明,影响因素pH值、水力负荷、碳氮比、植物均对系统处理农村生活污水的除磷能力有极显著的影响(P<0.01)。从单因素分析来看,当污水呈偏酸性、中性、偏碱性时,TP的平均去除率均高于90.00%,偏碱性环境下湿地对TP的去除率略高一些。水力负荷为33mm/d时,TP的平均去除率最高,达95.52%。各种植物对模拟农村生活污水中的污染物的处理能力不同,香根草和灯心草对TP的平均去除率相当,均达到94.00%以上,芦竹稍差一些,为89.94%。

Subsurface constructed wetlands with Vetiveria zizanioides,Arundo donax,Juncus effuses as vegetation were built to study the removal of phosphrous in rural domestic wastewater.Orthogonal experiment was designed and conducted to analyze the effect of pH,hydraulic loading,ratio of carbon and nitrogen and plant on the removal rate of TP in rural domestic wastewater.It was found that pH,hydraulic loading,ratio of carbon and nitrogen and plant all had significant effect on the removal rate of TP in rural domestic wastewater,hydraulic loading,was the most significant effect among them,while pH took the second place.In single factor analysis,whether the wastewater was acid,neutral or alkaline environment,the removal rate of TP were higher than 90%,in all alkaline environment the removal rate of TP was a little higher.While hydraulic loading was 33 mm/d,the removal rate of TP was the highest to 95.52%.The removal rate of TP by all kinds of plants was not the same,while the removal rate of TP by Vetiveria zizanioides,Juncus effuses was almost as to 94.00%,and Arundo donax reaced 89.94%.