1. School of Resources and Environmental Engineering Shandong University of Technology Zibo 255000 P. R. China
2. Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 P. R. China
3. National Engineering Research Centre of Industrial Wastewater Detoxication and Resource Recovery East China University of Science and Technology Shanghai 200237 P. R. China
4. School of Sensing Science and Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China