1. NUS Environmental Research Institute, National University of Singapore, Singapore 138602, Singapore
2. Energy and Environmental Sustainability Solutions for Megacities (E2S2), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602, Singapore
3. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
4. Korea Biochar Research Centre, APRU Sustainable Waste Management Program & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, South Korea
5. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore