Treatment of Domestic Sewage Using Constructed Wetlands

In this paper,the applicability of process of intensive primary pretreatment plus constructed wetland to treat domestic sewage is evaluated.It suggests that when the influent concentration of ammonia nitrogen reaches 35mg/L,the effluent from the process of intensive primary pretreatment plus constructed wetland is difficult to meet the Standard B of Level 1 in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB8978-1996).Meanwhile most of the constructed wetland is in anoxic environment,in which it′s good to remove nitrate nitrogen.It is proposed that when influent concentration of ammonia nitrogen is high,the nitrification should be added into the pretreatment of constructed wetland,using the nitrification and denitrification in the wetland for effluent to reach the discharge standard.