CAS Key Laboratory of Environmental Biotechnology;
Research Center for Eco-Environmental Sciences;
Chinese Academy of Sciences;
College of Resources and Environment;
University of Chinese Academy of Sciences;
Beijing Enterprises Water Group Limited;
School of Life Sciences;
University of Science and Technology of China;
Beijing Climate Change Response Research and Education Center;
Department of Environment and Energy Engineering;
Beijing University of Civil Engineering and Architecture;
Quorum; sensing; Activated; sludge; Ammonia-oxidising; archaea; Ammonia-oxidising; bacteria; Nitrogen; removal; Community; composition;