Purification of domestic sewage by vertical-flow constructed wetland system

The experiment used three different kinds of substrates (the medium coarse sand, blast furnace slag and cinder) as materials, and also used three height 1.0 m, 1.2 m, 1.4 m to set up the text. In order to study the purifying function of the Pearl River's water about the constructed wetland system under the hydraulic with 42 cm/d. The results showed that the constructed wetland system had obvious purifying function of the Pearl River,s pollutant TN,TP,COD.The removal rate of TN,TP,COD could reach 56.16%,93.49%,86.96%, respectively. The removal rates of systems were improved obviously with the increasing thickness of substrates.