title: Biological arsenite oxidation with nitrate as sole electron acceptor.
abstract: The potential of anoxic biological arsenite oxidation with nitrate as the sole electron acceptor was tested by using the acclimatized activated sludge which was chronically exposed under arsenite and nitrate coexisted aquatic environment. The activated sludge cultivated in a sequencing batch reactor was fed with arsenite and nitrate as the main substrates over six months. A series of batch experiments were conducted with acclimated sludge. Results showed that no obvious inhibition was observed in the anoxic arsenite oxidation linked to nitrate and nitrite reduction at the concentration of arsenite up to 35 mg AsIIIL-1. Moreover, it was found that nitrite was accumulated over the reaction probably due to limited availability of arsenite. The kinetic study further suggested that the maximum specific arsenite oxidation rates (qobs, max) with nitrate and nitrite as the electron acceptors were found to be 0.55 ± 0.10 mg AsIIIg-1VSS min-1and 0.40 ± 0.04 mg AsIIIg-1VSS min-1, respectively.
authors.affiliation: a School of Chemical Engineering and Energy , Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wang
authors.affiliation: a School of Chemical Engineering and Energy , Zhengzhou University , Zhengzhou , People's Republic of China.|b School of Civil and Environmental Engineering , Nanyang Technological University , Singapore.
authors.forename: Junfeng
authors.identifier: http://orcid.org/0000-0002-0574-5867
authors.initials: J
authors.lastname: Wan
authors.affiliation: a School of Chemical Engineering and Energy , Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Haisong
authors.identifier: http://orcid.org/0000-0002-7377-271X
authors.initials: H
authors.lastname: Li
authors.affiliation: a School of Chemical Engineering and Energy , Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Hongli
authors.initials: H
authors.lastname: Li
authors.affiliation: c GRESE EA 4330, Université de Limoges , Limoges , France.
authors.forename: Christophe
authors.initials: C
authors.lastname: Dagot
authors.affiliation: a School of Chemical Engineering and Energy , Zhengzhou University , Zhengzhou , People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
mesh_terms: D018053:Arsenites; D019149:Bioreactors; D004583:Electrons; D009566:Nitrates; D009573:Nitrites; D010084:Oxidation-Reduction
chemical_list: D018053:Arsenites; D009566:Nitrates; D009573:Nitrites
keywords: Acclimatized sludge; arsenite oxidation; dynamic modeling; electron acceptor; nitrate