白洋淀污染鱼塘水体异位水质提升工艺试验研究

Experimental study on ex-sitUwater quality improvement processes of polluted fish ponds in Lake Baiyangdian

以白洋淀污染鱼塘水体为研究对象,开展了磁混凝-磁分离+生态塘、磁混凝-磁分离+芦苇湿地、生物超深净化处理系统、磁混凝-磁分离+生物超深净化处理系统+芦苇湿地4种异位水质提升工艺的工程化试验研究。结果表明,磁混凝-磁分离工艺对污染塘水的COD、TP去除率分别为42.7%、88.66%;生物超深净化处理系统对污染塘水的COD、TP去除率分别为60.50%、95.59%,处理后水质主要指标均可达到地表水环境质量Ⅲ类水质标准;磁混凝-磁分离+生物超深净化处理系统对污染塘水的COD、TP去除率分别为62.96%、94.07%,与生物超深净化系统单独运行相比,生物深度净化系统可进一步降解磁混凝-磁分离工艺出水中污染物,但最终出水与生物系统单独运行相比不具优势;芦苇湿地对设备出水水质具有一定改善作用,对整套处理系统出水的COD、TP的去除率分别约为16.08%和33.1%。

Taking polluted fish ponds in Lake Baiyangdian as the research object,this paper carries out engineering tests for four different ex-sitUwater quality improvement processes,namely,magnetic coagulation-magnetic separation+ecological pond,magnetic coagulation-magnetic separation+reed wetland,biological ultra-deep purification treatment system,magnetic coagulation-magnetic separation+biological ultra-deep purification system+reed wetland.The results reveal that the chemical oxygen demand(COD)and total phosphorus(TP)removal rates of polluted pond water by the magnetic coagulation-magnetic separation process are 42.7%and 88.66%,respectively.Those by the biological ultra-deep purification treatment system are 60.50%and 95.59%,respectively,and after treatment,the main water quality indexes can reach the standards of ClassⅢin GB3838-2002.If the magnetic coagulation-magnetic separation and the biological ultra-deep purification treatment system are combined to treat the polluted fish pond water,the COD and TP removal rates are 62.96%and 94.07%,respectively.Compared with the biological ultra-deep purification system,the combination can further degrade the pollutants in the effluent produced by the magnetic coagulation-magnetic separation process,but the final effluent is not superior to that by the biological system alone.Reed wetlands can improve the effluent quality to a certain extent,and the COD and TP removal rates of the effluent of the whole treatment system are about 16.08%and 33.1%,respectively.