1. Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400044, China
2. Engineering School of Sustainable Infrastructure & Environment (ESSIE), Department of Environmental Engineering Sciences, University of Florida, Gainesville, FL 32611-6580, USA
3. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang 150090, China