模拟人工湿地对生活污水中脱氮除磷的研究

Purifying Effects on Nitrogen and Phosphorous in an Artificial Wetland

通过室内模拟人工湿地,研究了风车草、梭鱼草和香蒲组合技术对生活污水中氮磷的去除效应及其去除效率与水力停留时间(HRT)的变化规律。本试验用水为生活污水,氨氮20.09mg/L,TN25.12mg/L,PO43--P3.933mg/L,TP5.89mg/L,CODCr92.3mg/L,BOD524.7mg/L。研究结果表明,各种处理对氮磷的去除效率随着停留时间的延长而增加,其中梭鱼草+香蒲和梭鱼草+风车草2种处理对氮、磷的去除效率最好,HRT为6d时,对总氮和氨氮的去除率达到90%和91%,对总磷和磷酸盐的去除效率达到84%和82%,HRT为12d时,对总氮和氨氮的去除效率达到92%和95%,对总磷和磷酸盐的去除效率达到90%。考虑野外运营,认为HRT6d为最佳。

Artificial wetlands were set up in a greenhouse, and the purifying effects on nitrogen and phosphorous were studied with wastewater containing NH 3 -N 20.09 mg/L, TN 25.12 mg/L, PO 4 3- -P 3.933 mg/L, TP 5.89 mg/L, COD Cr 92.3 mg/L, BOD 5 24.7 mg/L. The results showed that the purifying effects were higher as time passed, and the purifying effects on nitrogen and phosphorous in the wetland cultivated with Pontederia cordata Typhae latifolia and with Pontederia cordata and Cyperus alternifolius were higher than normal. When HRT was 6 days, the removal of total nitrogen, ammonium, total phosphorous, and phosphate were 90% ,91%, 82%, and 84%, respectively, and were 92%, 95%, 90%, and 90%, respectively,when HRT was 12 days.