Pollutants removal performance of subsurface wastewater infiltration system under different hydraulic loading rates

摘要

Field-scale experiments were conducted through a subsurface wastewater infiltration system (SWIS), with effective depth of 0.8 m, under hydraulic loading rates (HLR) of 0.044, 0.071, 0.098 and 0.12 m~3/(m~2d). Taking the hydraulic and treatment efficiencies into consideration, HLR of 0.098 m~3/(m~2d) was recommended. Under this condition, NH_3-N, COD, TN and TP average removal efficiencies were 82.6%, 83.7%, 80.6 and 91.5%, respectively. This study will guide the control of operational parameter of a SWIS when it applies in decentralized wastewater treatment.