土壤过滤系统处理农村生活污水的 试验研究

采用一种土壤过滤系统处理农村生活污水，考察了该工艺对CODCr、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0.05 m3/（m2·d）， 水力停留时间为3 d时。该土壤过滤系统对CODCr、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84.6%、83.3%、64.3%、59.8%和70%。出水CODCr约为18.3~42.1 mg/L，BOD5约为8.9~17.3 mg/L，NH3-N约为11.2~17.7 mg/L，TN约为21.2~31.3 mg/L，TP小于2.0 mg/L，出水水质优于农田灌溉水质标准（GB 5084—2005）。气温变化和进水污染物浓度对处理效果影响明显。总体上来讲，温度大于22 ℃时，进水污染物浓度越低处理效果越好。

Experimental study on treatment of rural domestic sewage with soil infiltration system

A soil infiltration system is applied for treatment of rural domestic sewage.The removal efficiencies of CODCr， BOD5， NH3-N， TN and TP in the process are investigated.The result shows that when the influent load is 0.05 m3/（m2·d） and hydraulic retention time is 3-day， the removal process may achieve better removal efficiencies of CODCr， BOD5， NH3-N， TN and TP.The average removal efficiencies of CODCr， BOD5， NH3-N， TN and TP in the process are 84.6%， 83.3%， 64.3%， 59.8% and 70% respectively.In the effluent， CODCr is about 18.3~42.1 mg/L， BOD5 is about 8.9~17.3 mg/L， NH3-N is about 11.2~17.7 mg/L， TN is about 21.2~31.3 mg/L and TP is less than 2.0 mg/L.It is better than that of standards for irrigation water quality（GB 5084—2005）.Temperature variation and pollutant content in influent have obvious effects on treatment efficiency.In general， when the temperature is higher than 22 ℃， the lower the pollutant content in influent， the better the treatment efficiency is.