Performance of Constructed Wetland for Treatment of Stormwater Runoff in Eco-residential Area

Combined with the stormwater reuse engineering in an eco-residential area of Chongqing,the quality and quantity of stormwater runoff were analyzed,and the performance of constructed wetland treating stormwater runoff and the pollutant removal efficiency in different conditions were investigated in order to aid the design,operation and maintenance of similar constructed wetland in residential areas.The results show that in South China with heavy rainfall,the stormwater runoff has the potential of utilization in new developed residential areas with separate system for its relatively good water quality.The constructed wetland has a good purification effect on stormwater in constant inflow condition and the outflow quality can meet the requirement in the Reuse of Urban Recycling Water—Water Quality Standard for Scenic Environment Use(GB/T 18921-2002).The constructed wetland can withstand short-term stronger shock load.In order to reduce the adverse effect of overflow on the environment and first flush effect on the structures,the volume of detention tank should be more than or equal to that of collected initial stormwater.