1. Biochemical Engineering Department, University College London, Gower Street, London WC1E 6BT, UK
2. School of Ecology and Environment Studies, Nalanda University, Patna 803116, India
3. Environmental Research Institute, National University of Singapore, Singapore 119077, Singapore
4. Energy and Environmental Sustainability for Megacities (E2S2), Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, Singapore 138602, Singapore