【摘要】 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。更多还原

【Abstract】 A novel staircase constructed wetland was applied for treatment of domestic sewage.The removal efficiencies 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 CODCr,BOD5,NH3-N,TN and TP in the process were 90.6%,87.9%,66.7%,63.4% and 92.6%,respectively.The effluent COD was about 14.1~30.8 mg/L,BOD5 was about 8.2~13.1 mg/L,NH3-N was about 9.9~19.6 mg/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 irrigation water quality(GB5084-2005).Plant grow density,temperature variation and influent pollutant concentrations 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.更多还原