1. Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction, Nanjing University of Technology, Nanjing, Jiangsu 210039, China
2. Department of Biological and Agricultural Engineering, North Carolina State University, Campus Box 27625, Raleigh, North Carolina 27695-7625, United States
3. College of Urban Construction, Wuhan University of Science and Technology, Wuhan, Hubei 430065, China