1. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China
2. Shen Zhen Water Affairs (Group) Company Ltd., Shenzhen 518031, P. R. China
3. The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999066, Hong Kong
4. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, P. R. China