Treatment of Rural Domestic Wastewater Nitrogen Removal in Hydrolytic Tank-Vertical-Horizontal Subsurface Flow Constructed Wetland System

An hydrolytic tank-vertical-horizontal subsurface flow constructed wetland system for treating rural domestic wastewater was studied in removal efficiency and mechanism for CODCr,NH4+-N,NO3——N,TN in Guangpo Village,Simao Town of Pu'er City.The hydrolytic tank part,which compared with vertical-horizontal subsurface flow constructed wetland,was also studied for explaining the functions of hydrolytic tank-vertical-horizontal subsurface flow constructed wetland system.The results showed that this system could remove 78%,89%,51%,and 85% of CODCr,NH4+-N,NO3——N and TN respectively,and the effluent concentration were not more than 46,3.9,3.8 and 5.8 mg/L for CODCr,NH4+-N,NO3——N and TN respectively,which were below the national discharge standard of pollutants for municipal wastewater of Class A level(GB18918-2002).Hence,this system is very effective in treating rural domestic wastewater,it is also material/energy-saving compared with central technical systems,thus,it is worth for popularization and application in rural domestic wastewater treatment.