Application of vertical flow constructed wetland in Northern areas

The effect of Shenyang Hunnan demonstration constructed wetland on the removal of pollutants in domestic sewage was analyzed through the water quality monitoring.The results showed that,when the average mass concentration of COD,NH3-N,TP,BOD5,TN in influent water were 198.2-173.3,39.90-67.95,3.48-7.21,80.3-182.5,55.23-70.95 mg/L respectively,the average removal rate of the above indexes were 91.82%,98.37%,90.19%,97.04%,20.32% respectively.The results indicated that,vertical constructed wetland could suffer from the winter,with the water′s flowing in and discharge,efficient gas exchange was obtained,which compensated the oxygen deficiency of the bed,and greatly improve the removing effect on pollutants.