1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an 710055, China
2. Key Laboratory of Membrane Separation of Shaanxi Province, Research Institute of Membrane Separation Technology of Shaanxi Province, No. 13 Yanta Road, Xi'an 710055, China
3. Key Laboratory of Environmental Engineering of Shaanxi Province, No. 13 Yanta Road, Xi'an 710055, China