滨岸缓冲带脱氮性能试验研究

Research on Denifitrification of Riparian Buffer

为了摸清整个滨岸缓冲带系统的脱氮效应及各类型滨岸缓冲带在系统中的作用,通过工程尺度的现场试验,研究了一定浓度污染负荷冲击下滨岸缓冲带各区TN、NO-3-N、NO-2-N和NH+4-N的净化机理。结果表明:农田是湖泊、水库水体非点源污染物的重要源头,其他不同形式的植被过滤带可以有效地聚集、吸收污染物。其中,乔草复合过滤带比单一草本过滤带具有更好的氮素去除效果,乔草复合过滤带中TN、NO-3-N、NO-2-N和NH+4-N质量浓度消减率分别为84.21%、51.61%、17.61%和71.98%,而单一草本过滤带只是37.44%、49.60%、6.72%和74.45%,芦苇植物为主的挺水植物过滤带对农业非点源污染可以起到很好的防治作用,TN、NO-3-N、NO-2-N和NH+4-N质量浓度消减率为82.77%、36.40%、37.82%和74.54%。

In order to find out the whole riparian buffer system denitrification effect and various types of riparian buffer in the system,under a certain concentration of pollution load impact riparian buffer area TN （total nitrogen）,NO3--N （nitrate nitrogen）,NO2--N （nitrite nitrogen） and NH4＋-N （ammonia nitrogen） purification mechanism were studied by engineering-scale fields test on site.The results showed that farmland is an important source of lake reservoir water nonpoint source pollutants,other different forms of vegetation filter can effectively gather,absorb pollutants.Among them,tree grass composite filtration zone has better effect of nitrogen removal than a single herb filtration zone,tree grass composite filtration zone with TN,NO3--N,NO2--N and NH4＋-N quality concentration subtractive rate was 84.21％,51.61％,17.61％ and 71.98％.And the quality concentration subtractive rate in single herb filtration zone was just 37.44％,49.60％,6.72％ and 74.45％.In addition,reed plant-based filter with a water plant of agricultural non-point source pollution has good control effect,the end removal ratio of runoff TN,NO3--N,NO2--N and NH4＋-N,was 82.77％,36.40％,37.82％ and 74.54％.