1. School of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China
2. The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, South China University of Technology, Guangzhou 510006, P. R. China
3. School of Environmental Science and Engineering, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, P. R. China