1. Ph.D. Student, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, Wenchang Rd. 68, Kunming 650093, PR China.
2. Postgraduate Student, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, Wenchang Rd. 68, Kunming 650093, PR China.
3. Professor, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, Wenchang Rd. 68, Kunming 650093, PR China.
4. Lecturer, Faculty of Environmental Science and Engineering, Kunming Univ. of Science and Technology, Wenchang Rd. 68, Kunming 650093, PR China (corresponding author).