强化生物絮凝/三级人工湿地处理高浓度生活污水

为强化"生物絮凝/三级人工湿地"处理小城镇高浓度生活污水的效能,开展了混凝及出水回流的试验研究.结果表明,投加混凝剂(PAC)可以显著提高预处理池对PO3-4-P的去除率,PAC的最佳投量为40 mg/L,相应的PO3-4-P去除率提高了37.5%.出水回流能显著提高湿地的净化效果,在回流比为1时,对污染物的去除率提高最大,对COD、NH+4-N、TN及PO3-4-P的去除率分别提高了19%、18.5%、13%和3.6%.经强化后,COD和PO3-4-P的最终出水浓度分别为31 mg/L和0.69 mg/L,达到了<城镇污水处理厂污染物排放标准>(GB 18918-2002)的一级B标准,对NH+4-N和TN的总去除率分别为76.9%和66.7%,也达到了一个较高的处理效能.

Bioflocculation/Three-stage Constructed Wetland for Enhanced Treatment of High-concentration Domestic Sewage

To enhance the treatment efficiency of high-concentration domestic sewage in small towns by bioflocculation/three-stage constructed wetland,the experimental research on coagulation and effluent recycling was conducted.The results show that the addition of coagulants(PAC) can increase the removal rate of PO3-4-P in the pretreatment tank.By setting the optimum PAC dosage of 40 mg/L,the relevant removal rate of PO3-4-P is improved by 37.5%.The effluent recycling can improve the purification effect of construct...