School of Environmental Science and Engineering Yat-sen University 510006;
Departamento de Ciencias Biológicas de Ciencias de la Salud Técnica de Manabí 130105;
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology 510006;
Comammox bacteria; Wastewater treatment; Nitrogen removal; Micropollutant degradation; Reactor operation;