Literature Review on Effect of Sludge Age on Microbial Community Structure in HMBRMin Li, Weiyuan Cao, Zhiheng Zhang, Guosen Peng, Zhixiang Hu, Guozhi Zhou and Kun DongE3S Web of Conf., 406 (2023) 01023DOI: https://doi.org/10.1051/e3sconf/202340601023