表面流人工湿地对高含量有机污染河水的去除效果研究

TREATMENT OF HIGH ORGANIC POLLUTANTS RIVER WASTEWATER BY SURFACE FLOW CONSTRUCTED WETLAND

利用不同植物(芦苇、香蒲)表流人工湿地处理高含量有机污染河水的研究。结果表明,当水力负荷为0.041m3/(d.m2),进水COD和BOD5分别为178.9～480.2 mg/L和40.75～225.6 mg/L,最大去除效果分别可达到93.64%和99.25%。出水COD低于90 mg/L,BOD5低于22 mg/L,均达到GB 18918-2002排放二级标准。高含量有机污水进入表面流人工湿地之后,有机物有效去除长度为32 m,其中发挥主要作用的场所是距进水点21 m以内的区域。表面流人工湿地中,芦苇床和香蒲床对高含量有机污染物去除效果无明显差异,它们根际和根区细菌总数差别不大。

The treatment of high concentration of organic river wastewater by the surface flow constructed wetlands with different plants（reeds,cattails） was studied.The highest removal rate of COD and BOD5were 93.64% and 99.25% when the concentrations of COD and BOD5were 178.9～480.2 mg/L and 40.75～225.6 mg/L,respectively.The concentration of COD and BOD5in the effluent was below 90 mg/L and 22 mg/L,respectively.Which reached second urban sewage treatment plant pollutant discharge standards.High concentration of organic wastewater could be effectively removed in the first 32 m after flowed into surface flow constructed wetland,and the initial 21 m played a major role.There were no significant difference of removal efficiency between reeds and cattails wetlands,because of the total number of bacteria in their rhizosphere and the root zones were not very different.