Evaluation of a Pilot Scale Combined Constructed Wetlands and Stabilization Ponds for Initial Rainwater Treatment

Abstract

For the storage rainwater quality maintenance and purification and the ecological water replenishment in the rain source river of industrial park, a combined process of “plant stabilization ponds and vertical flow constructed wetlands” was developed. The scale of pilot plant was 20 m3/h. The research showed that the combined process of constructed wetlands and stabilization ponds had a significant removal rate of COD, NH4+-N, TN, TP, SS of 14.13% ∼ 31.99%,33.64% ∼ 77.42%,24.72% ∼ 48.04%,61.29% ∼ 67.20%,45.44% ∼ 76.90%, with better treatment effect on N, P and SS in medium and low concentration. The circulation time has a relatively large impact on the removal rate of COD and SS, and a relatively small impact on NH4+-N, TN, TP, TN and TP.