Chinese Acad Sci;
Inst Hydrobiol;
State Key Lab Freshwater Ecol & Biotechnol;
Wuhan 430072;
Peoples R China;
Chinese Acad Sci;
Grad Univ;
Beijing 100049;
Peoples R China;
Cd2+; pb2+; biofilms; dehydrogenase activity; polysaccharide content; integrated vertical-flow constructed wetland(IVCW);