1. Assistant Engineer, MOE Key Laboratory of Regional Energy Systems Optimization, Resources and Environmental Research Academy, North China Electric Power Univ., Beijing 102206, China; and Chifeng Municipal Research Institute Of Environment, Linhuang St., Songshan District, Chifeng City, Inner Mongolia 024000, China.
2. Professor, MOE Key Laboratory of Regional Energy Systems Optimization, S-C Resources and Environmental Research Academy, North China Electric Power Univ., Beijing 102206, China (corresponding author).
3. Professor, Environmental Systems Engineering Program, Faculty of Engineering, Univ. of Regina, Regina, Saskatchewan S4S 0A2, Canada.
4. Research Assistant, MOE Key Laboratory of Regional Energy Systems Optimization, S-C Resources and Environmental Research Academy, North China Electric Power Univ., Beijing 102206, China.