title: Autotrophic nitrogen removal process in a potable water treatment biofilter that simultaneously removes Mn and NH4(+)-N.
abstract: Ammonia (NH4(+)-N) removal pathways were investigated in a potable water treatment biofilter that simultaneously removes manganese (Mn) and NH4(+)-N. The results indicated a significant loss of nitrogen in the biofilter. Both the completely autotrophic nitrogen removal over nitrite (CANON) process and nitrification were more likely to contribute to NH4(+)-N removal. Moreover, the model calculation results demonstrated that the CANON process contributed significantly to the removal of NH4(+)-N. For influent NH4(+)-N levels of 1.030 and 1.749mg/L, the CANON process contribution was about 48.5% and 46.6%, respectively. The most important finding was that anaerobic ammonia oxidation (ANAMMOX) bacteria were detectable in the biofilter. It is interesting that the CANON process was effective even for such low NH4(+)-N concentrations.
authors.affiliation: Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Yan'an
authors.initials: Y
authors.lastname: Cai
authors.affiliation: Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China. Electronic address: lidong2006@bjut.edu.cn.
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.affiliation: Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Yuhai
authors.initials: Y
authors.lastname: Liang
authors.affiliation: Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
authors.forename: Huiping
authors.initials: H
authors.lastname: Zeng
authors.affiliation: Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
mesh_terms: D064751:Ammonium Compounds / Q000302:isolation & purification*; D019149:Bioreactors / Q000382:microbiology*; D005374:Filtration; D008345:Manganese / Q000302:isolation & purification*; D009584:Nitrogen / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D064751:Ammonium Compounds; D008345:Manganese; D009584:Nitrogen
keywords: ANAMMOX bacteria; Biological filtration; CANON process; Mn oxidation; Potable water treatment