1. Professor, School of Environment, Tsinghua Univ., No.30 Shuangqing St., Beijing 100084, China (corresponding author).
2. Ph.D. Candidate, School of Environment, Tsinghua Univ., No.30 Shuangqing St., Beijing 100084, China.
3. Assistant Engineer, Technology Dept., China Energy Conservation DADI Environmental Remediation Co., Ltd., No.8 Xueqing St., Haidian, Beijing 100041, China.
4. Master Candidate, School of Environment, Tsinghua Univ., No.30 Shuangqing St., Beijing 100084, China.
5. Consultants for Waste Management, Institute of Environmental Technology and Energy Economics, Schellerdamm 19-21, Hamburg 21079, Germany.
6. Professor, School of Environment, Tsinghua Univ., No.30 Shuangqing St., Beijing 100084, China.