Yu, Lifang Natural continuous influent nitrifier immigration effects on nitrification and the microbial community of activated sludge systems. [electronic resource] - Journal of environmental sciences (China) Dec 2018 - 159-167 p. digital Publication Type: Journal Article ISSN: 1001-0742 Standard No.: 10.1016/j.jes.2018.02.021 doi Subjects--Topical Terms: Bioreactors--microbiologyNitrificationSewage--microbiology