人工湿地对有机污染物的去除效果与动态特征

通过对荣成人工湿地污水处理系统1999年1月至2004年12月间监测数据进行分析,确定系统的处理效果及有机污染物去除效果的动态特征。结果表明,人工湿地对SS、COD、BOD5均有很好的去除效果,出水质量浓度分别为27.6±6.6、90.0±12.5和22.7±4.3 mg.L-1,去除率分别为73.9%、63.8%和72.5%。大肠菌群、粪大肠菌群去除率分别为99.7%和99.6%。对NH4 -N和TP去除效果较差,出水质量浓度分别为11.2±2.7和2.03±0.29 mg.L-1,去除率分别为45.1%和30.2%。BOD5、COD的去除效果和季节变化有一定关系,每年的4—7月BOD5去除效果最佳,1月和12月去除效果最差。COD的去除效果每年6月和7月最高,1月和12月最低。分析BOD5、COD和SS去除效果的年际变化发现,BOD5和COD年平均去除率从1999年到2004年有增加的趋势。

Organic mater removal efficacy and dynamic feature of constructed wetlands for sewage treatment.

To evaluate pollutants removal capacity and dynamic feature of organic mater removal of a full-scale constructed wetland in Rongcheng Shandong province,China,Water samples collected from Jan.1999 to Dec.2004 were analyzed.The results showed that the constructed wetlands could effectively reduce output of suspended solids 73.9%,biological oxygen demand 72.5%,chemical oxygen demand 63.8%,coliform 99.7% and fecal coliform 99.6%.The removal efficacy of nitrogen(45.1%) was relatively low,and phosphorous(30.2%) had the least efficient reduction.BOD5 and COD removal efficiencies displayed seasonal variations.The least efficient COD and BOD5 reduction occurred in January and December.The most efficient BOD5 and COD reduction occurred from April to September,June and September respectively.Annual variation analysis showed that BOD5 and COD reduction efficiencies increased from 1999 to 2004.