A pilot-scale Constructed Rapid Infiltration (CRI) System in Dongguan Huaxing electrical equipment factory has been constructed to treat domestic wastewater by using natural sands for one year.The results show that the CRI system has better adaptive faculty for high impact loading and better removal effect for domestic wastewater in a Hydraulic Loading (HL) of more than 1 m/d.The average removal rates for SS,COD Cr and BOD 5 are 94.14%,91.99% and 94.44% respectively;the average concentrations of SS,COD ...