Abstract: Enhanced floating treatment wetland (EFTW) with biofilm carriers is a new ecological restoration technology developed in recent years. In this study, three kinds of biofilm carriers were added into traditional floating treatment wetland (FTW). Their purifying effects on high phosphorus-concentration aquaculture water and aquaculture pond water in Shanghai were examined. Results elucidated that in high phosphorus-concentration (2.36-3.42 mg/L) aquaculture water, the average removal rates of TN, TP and COD were 34.9%, 12.2% and 26.1%, respectively, with no significant difference among the three treatment groups; in aquaculture pond water in Shanghai with average polluted level, EFTW with elastic packing had the best ability of purifying TN and TP with the removal rate reaching 83.9% and 69.3%, respectively, followed by EFTW with combined packing and EFTW with bio-cord packing. The removal rates of COD and NH₄⁺-N by the three treatment systems all exceeded 70%. In conclusion, EFTW with elastic packing can be applied to the ecological restoration project in freshwater aquaculture ponds in Shanghai.

Key words: aquaculture water, enhanced ecological floating bed;artificial packing;stereo-elastic packing, bio-cord packing, ecological restoration