潜流人工湿地不同运行方式处理生活污水研究

摘要

Subsurface flow constructed treatment wetlands,featured by the significant landscaping function and pollutants rem-oval efficiency through changing the DO concentration to increase the denitrification ca-pacity,has been increasing applied for waste-water treatment.This study has compared DO concentration, pollutants removal efficiency and growth plant root in the subsurface constructed wetland with different operation modes.The DO concentration,which mainly derived from plant root,is less than 0.1mg/L in Subsurface flow constructed treatment wetlands with continuous-flow operation,while it increases to 0.2 mg/L due to the root spread of Canna generalis in Subsurface flow constructed treatment wetlands with intermittent operation,which enhanced the TN an-d NH 3-N removal efficiency from 45.6%,46.1%to 57.8%,62.9%,respectively.%潜流人工湿地具有较好的景观效果和良好的污染物处理效率,在农村生活污水处理中得到了广泛的应用.湿地运行方式因能通过调节湿地内部溶解氧(DO)质量浓度与分布而影响其脱氮效率,在实际运行中受到重视.本文研究了潜流人工湿地连续和间歇运行方式下湿地床内 DO 质量浓度的变化,对比分析了其运行效果及湿地植物根系在两种运行方式下的生长情况.结果表明：连续运行条件下湿地床内植物根系泌氧较少,湿地床后端 DO 质量浓度基本保持在0.1 mg/L 以下；间歇运行方式更能有效促使植物根系向下延伸与周边扩展,提升了整个湿地床内的 DO 质量浓度,使两级湿地床内的 DO 质量浓度都保持在0.2 mg/L 以上；间歇运行方式下出水总氮和氨氮的去除效率由连续运行下的45.6%,46.1%分别提高到57.8%,62.9%.