[1]Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;
[2]Water Technology Center, The Hong Kong University of Science and Technology, Hong Kong, China;
[3]Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution (Hong Kong Branch), The Hong Kong University of Science and Technology, l-long Kong, China;
[4]School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China;
[5]Department of Biotechnology, Delft University of Technology, Delft2629 HZ, the Netherlands;