1. Guangdong Provincial Engineering Technology Research Center for Urban Water Cycle and Water Environment Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Room 1807, Energy and Environment Building, Shenzhen 518055, P.R. China
2. State Environmental Protection Key Laboratory of Microorganism Application and Risk Control, School of Environment, Tsinghua University, Beijing 100084, P.R. China
3. Department of Civil and Environmental Engineering, University of California, Irvine, CA, 92612, USA