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新型阶梯式人工湿地处理生活污水的研究

Keywords: 阶梯式人工湿地,生活污水,农田灌溉水质标准

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Abstract:

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0.44m3/(m2·d),水力停留时间为3d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14.1~30.8mg/L,BOD5约为8.2~13.1mg/L,NH3-N约为9.9~19.6mg/L,TN约为17.3~28.7mg/L,TP小于1.2mg/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。

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