复合垂直流人工湿地除氮磷效果研究

Research on Phosphorus and Nitrogen Removal from Sewage by Integrated Vertical Flow Constructed Wetlands

利用复合垂直流人工湿地处理低浓度典型生活污水,研究了运行方式和水力负荷对氮、磷的净化效果。结果表明,周期6h(进水3h间歇3h)对氮、磷的净化效率最高,美人蕉湿地床的NH3-N、TN、TP出水水质分别为3.51、6.00、0.26mg/L,去除率分别达到73.50%、70.54%、92.50%;风车草湿地床NH3-N、TN、TP的出水水质为4.91、6.96、0.33mg/L,去除率分别达到58.10%、65.84%、91.60%。各指标均能达到《城镇污水处理厂污染物排放标准(GB18918-2002)》一级A标准。对水力负荷的进一步研究结果表明,水力负荷从高降低至363mm/d时,美人蕉湿地床出水NH3-N、TN、TP分别为5.86、8.24、0.61mg/L,风车草出水NH3-N、TN、TP分别为5.46、9.22、0.69mg/L,两湿地床的NH3-N、TN均低于一级A标准,出水TP低于一级B标准;进一步降低水力负荷至181mm/d时,出水的氮、磷指标均达到一级A标准。

To process low concentration sewage by integrated vertical flow constructed wetlands, running condition and hydraulic loading were studied on phosphorus and nitrogen removal. Results indicated that as six hours cycle three hours influent time and three hours interval time, efficiency of phosphorus and nitrogen removal was the highest. Effluent of NH3-N, TN,TP in Canna constructed wetlands was 3.51 mg/L,6.00 mg/L,0.26 mg/L and removal efficiency was 73.50% ,70.54% , 92.50% respectively. Effluent of NH3-N,TN,TP in Cyperus constructed wetlands was 4.91 mg/L,6.96 mg/L,0.33 mg/L and removal efficiency was 58.10%,65.84%,91.60% respectively. Effluent quality of NH3-N,TN,TP met the first class A criteria specified in GB 18918-2002. Results on hydraulic loading indicated when hydraulic loading decreased from high to 363 mm/d. Effluent of NH3-N,TN,TP in Canna constructed wetlands was 5.86 mg/L,8.24 mg/L,0.61 mg/L and effluent of NH3- N,TN,TP in Cyperus constructed wetlands was 5.46 mg/L,9.22 mg/L,0.69 mg/L respectively,NH3-N,TN specified in GB 18918-2002,TP effluent was superior to B criteria. When hydraulic loading decreased to 181 mm/d, NH3-N,TN,TP effluent was superior to A criteria.