044

Title:

Water quality retrieval and algae inhibition from eutrophic freshwaters with iron-rich substrate based ecological floating beds treatment

Discipline: Environmental Engineering

Presenter:

Zhifeng Hu

Abstract:

Ecological floating rafts in restoration of eutrophic freshwaters were deemed to a frequently used method. In this study, a manipulative experiment using ecological floating rafts based on iron-rich substrate (IRS) was conducted. IRS based ecological floating bed has been developed in this study and showed efficient restoration of eutrophic freshwaters. The approach was attempted to study the nutrient removal efficiency and algae inhibition effect of IRS. The aims of this study are to: (1) combine iron-rich substrate (microelectrolysis) and ecological floating beds to develop an appropriate approach for restoration of eutrophic freshwaters; (2) evaluate the water improvement and algae inhibition efficiency of SEFB; (3) study the microorganism on IRS surface and the mechanism of SEFB restoration. The results showed that 98.2% chlorophyll-a (chl-a) removal rate was achieved in 7-day restoration by IRS accompanied with high nutrient removal efficiency. In addition, iron-rich substrate based ecological floating beds could reached 82.1% chl-a removal rate and 98.5% total phosphorus (TP) removal rate with the increasing activity of aquatic organisms through a 50-day pilot scale experiment. The findings imply that iron-rich substrate-based ecological floating beds are an alternative method for ecological restoration of eutrophic freshwaters.

Author(s):

Zhifeng Hu, Hong Yao, Wen Zhang

Funding Acknowledgements:

National Natural Science Foundation of China (51778040)