1 Department of Environmental Technology and Management, Faculty of Environmental Engineering, National University of Civil Engineering, 55 Giai Phong road, Hanoi, 113021, Vietnam.
2 Biofuels by Biocatalysts Research Unit, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.
3 Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand.
4 Department of Chemical Engineering, National Institute of Technology Karnataka Surathkal, Surathkal, India.
5 Department of Water Supply, Sanitation and Environmental Engineering, IHE Delft Institute for Water Education, Delft, 2601DA, The Netherlands. e.raj@un-ihe.org.