1. Ph.D. Candidate, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
2. Professor, School of Municipal and Environmental Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China (corresponding author).
3. Associate Professor, School of Energy and Architecture, Harbin Univ. of Commerce, Harbin 150028, China.
4. Associate Professor, Dept. of Mechanics, Kim Il Sung Univ., Pyong Yang, D. P. R. Korea; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.