1. College
of Environmental Science and Engineering, Hunan University, No.
8 South Lushan Road, Yuelu District, Changsha 410082, P. R. China
2. Key
Laboratory of Environmental Biology and Pollution Control, Ministry
of Education, Hunan University, No. 8 South Lushan Road, Yuelu District, Changsha 410082, P. R. China
3. Department
of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Sai Kung, Hong Kong, P. R. China
4. Changjiang River Scientific Research Institute, No. 23 Huangpu Road, Jiangan District, Wuhan 430010, P. R. China