Aquatic environment

Phytoremediation of urban wastewater by model wetlandswith ornamental hydrophytes

ZHANG Xiao-bin , LIU Peng , YANG Yue-suo , CHEN Wen-ren


Received September 12, 2006,Revised December 07, 2006, Accepted , Available online

Volume 19,2007,Pages 902-909

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Phytoremediation o ers a cost-e ective, non-intrusive, and safe alternative to conventional cleanup techniques. In this study, we used ornamental hydrophytes plants as constructed wetlands to treat urban or rural domestic wastewater. Most ornamental hydrophytes adapted to the wastewater well, and were fairly e cient in scavenging BOD5 (biological oxygen demand 5 d), COD (chemical oxygen demand), TN (total nitrogen), TP (total phosphorus) and heavy metals (Cr, Pb, Cd) in the wastewater. However, the e ciency varied a lot for various species to di erent contaminants, Iris pseudacorus L. and Acorus gramineus Soland were good choices for treatment of composite-polluted urban wastewater. Some variation in the change of membrane peroxidation and endogenous protective system in responses to wastewater was found among six hydrophytes, which have a correlation with the e ciency of wastewater treatment. It may demonstrate that the developed antioxidative systems of I. pseudacorus and A. gramineus contributed much to their superiority. On the other hand, interaction of di erent components in the wastewater might have certain e ects on phytoremediation.

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