1. School of Environmental Science and Engineering Sun Yat‐Sen University Guangzhou 510275 P. R. China
2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou 510275 P. R. China
3. Department of Civil Engineering University of Louisiana at Lafayette P. O. Box 43598 Lafayette LA 70504 USA
4. Center for Environmental Technology The Energy Institute of Louisiana P. O. Box 43597 Lafayette LA 70504 USA