Purifying Effect of the Domestic Sewage in New Countryside by Integrated Constructed Wetland

[Objective] The research aimed to study purifying effect of the domestic sewage in new countryside by integrated constructed wetland.[Method] By establishing integrated vertical flow-horizontal subsurface flow wetland system,its purifying effect on pond wastewater accepting domestic sewage and rainfall sewage in new countryside was studied.[Result]In spring,summer and autumn,integrated constructed wetland system had better removal effect on wastewater,and removal effect was stable.During whole running period,average removal rates of the CODCr,TP,TN and NH4+-N by integrated constructed wetland system were respectively more than 64.71%,64.81%,40.21% and 54.26%.Average concentration of the effluent reached Level-III water quality standard of Environmental Quality Standard for Surface Water(GB3838-2002).Effluent quality of the second-order wetland unit in integrated constructed wetland system was obviously better than the first one,but treatment effect of the first order was higher than the second one.[Conclusion]The research could provide reference basis for treatment of the domestic sewage in new countryside.