新型阶梯式人工湿地处理生活污水的研究

A novel staircase constructed wetland for treatment of domestic sewage

采用一种新型阶梯式人工湿地处理生活污水,考察了该工艺对COD、BOD5、NH3-N、全氮(TN)和全磷(TP)的去除效果,实验结果表明,当水力负荷约为0.44 m3/(m2.d),水力停留时间为3 d时,湿地对COD、BOD5、NH3-N、全氮(TN)和全磷(TP)的去除效果较好,平均去除率分别达到90.6%、87.9%、66.7%、63.4%和92.6%,出水COD约为14.1～30.8 mg/L,BOD5约为8.2～13.1 mg/L,NH3-N约为9.9～19.6 mg/L,TN约为17.3～28.7 mg/L,TP小于1.2 mg/L,出水水质优于农田灌溉水质标准(GB5084-2005)。植物种植长状况、温度变化及进水污染物浓度等因素对湿地处理效率有较大影响,总体上来讲,温度大于24℃、植物种植密度越大、进水污染物浓度越低处理效果越好。

A novel staircase constructed wetland was applied for treatment of domestic sewage. The removal effieiencies of COD, BOD5 , NH3-N, TN and TP in the process were investigated. The result showed that under the conditions of influent load of 0. 44 m3/（m2 d） and HRT of 3 day, the removal process may achieve better removal efficiencies of COD, BOD5 , NH3-N, TN and TP. The average removal efficiencies of CODer, BOD5 , NH3-N, TN and TP in the process were 90.6% ,87.9% ,66.7% ,63.4% and 92.6% , respectively. The efflu- ent COD was about 14. 1 -30. 8 rag/L, BOD5 was about 8.2 - 13. 1 mg/L, NH3-N was about 9. 9 - 19.6 rag/ L, TN was about 17.3 - 28.7 mg/L and TP was less than 1.2 mg/L. It was better than that of srandards for irri- gation water quality （ GB5084-2005 ）. Plant grow density, temperature variation and influent pollutant concentra- tions have obvious effects on treatment efficiency. In general, when the temperature is greater than 24℃ , grow density is higher and influent pollutant concentrations are low, the treatment efficiency is high.