Since the water quality of rural domestic sewage is characterized by low COD,high water quantity,and widely distributed areas,it is proposed that BAF-constructed wetland process is to be used,based on the present constructed wetlands technology,so as to solve the problem that the treatment effect of constructed wetland process has been restricted by DO. By controlling the aeration conduit switch and the flow rate of two influent pipes ,the in-fluences of 4 kinds of aeration patterns and step-feed ratio on removing rates are investigated. The results show that when intermediate aeration patterns are used and the step-feed ratio is 2:1,the removing effects of BAF-constructed wetlands on the removing rates of COD,ammonia nitrogen,and total nitrogen are ideal,i.e. the removing rates are 73.17%,87.22%,and 63.17%,respectively. And the effluent can reach the first level of A standard.%根据农村生活污水水质COD较低、水量较大、面广而分散的特点,依据现有的人工湿地工艺,提出一种BAF型人工湿地,以解决人工湿地工艺处理效果受DO局限的问题.通过控制曝气管的开关及2根进水管流量来探究4种曝气方式和分段进水比对去除效果的影响,结果表明,采用中间曝气方式和分段进水比为2:1条件下,BAF型人工湿地对COD、氨氮、总氮的去除效果都比较理想,去除率分别为73.17%、87.22%、63.17%,出水可达到一级A标准.
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