Key Laboratory of Drinking Water Science and Technology;
Research Center for Eco-Environmental Sciences;
Chinese Academy of Sciences;
Beijing 100085;
China;
Harbin Institute of Technology;
School of Civil and Environmental Engineering;
Shenzhen 518055;
China;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
Center for Water and Ecology;
State Key Joint Laboratory of Environment Simulation and Pollution Control;
School of Environment;
Tsinghua University;
Beijing 100084;
China;
Wastewater treatment plant upgrade; Epilithic biofilm; Pathogens; Virulence factors; Health risk;