A system of ecological gravel bed and constructed wetland has been developed to treat rural sewage with a processing capacity of 400 m3/d.The collected results demonstrated that this system/design significantly improved the rural sewage.When the COD,ammonia nitrogen and TP of raw water was no more than 200.0 mg/L,40 mg/L and 4 mg/L,the average removal rates of COD,ammonia nitrogen,TN and TP were 78.98%,92.02%,69.44%and 87.98%respectively.The major indices meet Daqing River Basin Water Pollutant Discharge Standard(DB 13/2795-2018).This system has exhibited robust treatment capabilities in processing waterways with a wide spectrum of qualities.This project is estimated to reduce Cod,nitrogen,and TP by 23.36 ton,5.548 ton,and 0.38 ton respectively annually,which significantly improved the ecological environment of the main channel in City.
关键词
劣V类水体/生物转盘/植物碎石床
Key words
Bad class V river channels/RBC/Constructed wetland