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Research on Key Process Parameters and Membrane Pollutant Characteristics of Forward Osmosis Treating Simulated Grass Carp Farming Wastewater

Authors： DU Jianghui，CAI Yuyan，LEI Zeyu，XU Yuliang，HAN Zhiying

Units： 1.College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058 ,China; 2.Key Laboratory of Equipment and Informatization in Environment Controlled Agriculture, Ministry of Agriculture, Hangzhou 310058 ,China

KeyWords： Forward osmosis; COD concentration; water flux; response surface method(RSM); membrane fouling

ClassificationCode：X714

year,volume(issue):pagination： 2021,41(5):121-129

Abstract：

In this study, sucrose solution was used as the draw solution of the forward osmosis system, and the simulated grass carp farming wastewater was used as the feed solution. By using the response surface method, the COD concentration of the feed solution and the average water flux of the system were investigated under different concentrations of draw solution, the flow rate of the cross-flow filtration and temperature of draw solution, consequently, the optimal parameters combination for the maximal values of COD concentration and the average water flux was determined. In addition, the membrane fouling in the forward osmosis system was characterized in this study. Results show that the concentration of the draw solution, the flow rate of the cross-flow filtration and the temperature of the draw solution had significant impacts on the COD concentration of the feed solution and the average water flux of the system, respectively. The concentration of the draw solution and the flow rate of the cross-flow filtration had greater impacts on the forward osmosis system, than the temperature of the draw solution did. The optimal combination of process parameters is as follows: the concentration of the draw solution is 2 mol/L, the flow rate of cross-flow filtration is 18.7 cm/s, and the temperature of the draw solution is 33.6 ℃. Under the forementioned optimal combination of process parameters conditions, the COD concentration multiple of the simulated wastewater is 2.9 and the average water flux is 27.4 L/(m2?h). The characterization of membrane fouling demonstrated that the pollutants attached on the membrane are mainly organic pollutants such as proteins, and inorganic salts were also detected.

Funds：

国家重点研发计划（2019YFD0900300） ?

AuthorIntro：

杜江辉（1995-），男，硕士研究生，主要研究方向：养殖废水深度处理技术

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