不同停留时间下复合流人工湿地沿程净化效果的研究

摘要

采用复合流人工湿地系统净化生活污水，通过对不同处理单元段末出水水质的分析，研究了该系统在水力停留时间为12，24，36，48，60 h时，对主要水质指标降解的影响。结果表明：随着停留时间的增加，CODCr、总氮、氨氮、总磷的去除率先增大后减小，CODCr、总氮、氨氮同时在36 h时达到最大去除率79．87％、77．48％、82．07％，总磷在48 h时达到最大去除率91．50％；停留时间为36 h时，污染物综合去除率最高，为82．15％，其出水各指标可达城镇污水处理厂污染物排放标准（ GB18918-2002）一级B标准。%In this study , the key water quality indicators of hybrid flow constructed wetlands were ana-lyzed.The residence time was 0.5 d,1 d,1.5 d and 2 d.The results showed that:with the increase of residence time,the processing efficiency of CODcr ,total ammonia ,ammonia nitrogen and total phosphorus first increased and then decreased;when the residence time was 3/2 d,the removal rates of CODcr ,total ammonia and ammo-nia nitrogen reached the maximum ,being 79.8%,77.48%and 82.07%,respectively.The removal rate of total phosphorus reached the maximum ,being 91.5%in 2 d.Each index of effluent water could meet the pollutant discharge standards of Grade 1 B,for urban sewage treatment plants ( GB18918-2002 ) .