1. Associate Professor, School of Environmental Science and Engineering, Tianjin Univ., Tianjin 300072, China (corresponding author).
2. Master, School of Environmental Science and Engineering, Tianjin Univ., Tianjin 300072, China.
3. Ph.D. Student, School of Civil Engineering, Tianjin Univ., Tianjin 300072, China.
4. Assistant Professor, Dept. of Engineering Technology, Univ. of Houston, Houston, TX 77204.