Simulation constructed wetland system for treating stormwater runoff in southern China

Storm runoff, which has some special characteristics such as random, abrupt and changing largely in water quality, is difficult to be treated by conventional wastewater treatment. Constructed wetlands has advantages including low operation cost, simple in process, strong resistance to shock loading. The performance of an experimental constructed wetland system was simulated and monitored in Southern China. The design of simulated system was introduced and parameters of systems were calculated. Distribution of dissolved oxygen, the removal of total suspended solids, nitrogen, and phosphorus were studied. The results show that the Constructed wetlands have higher efficiency to remove the pollutants in three seasons(spring, summer and autumn), the removal efficiencies of total phosphorus were from 64.65 to 90.52%, and the removal efficiencies of total nitrogen were from 28.96 to 48.04%.