1. College of Urban Construction; Nanjing Tech University; Nanjing 211800 China
2. Jiangsu Key Laboratory of Industrial Water-Conservation & Emission Reduction; College of Environment; Nanjing Tech University; Nanjing 211800 China
3. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment; State Ministry of Education; Chongqing University; Chongqing 400045 China