Biological arsenite oxidation with nitrate as sole electron acceptor. Issue 16 (18th August 2017)

• Record Type: Journal Article
• Authors: Wang, Jie; Wan, Junfeng; Li, Haisong; Li, Hongli; Dagot, Christophe; Wang, Yan
• Is Part Of: Environmental technology. Volume 38:Issue 16(2017)
• Page Start: 2070
• Page End: 2076
• Publication Date: 2017-08-18
• Subjects: Acclimatized sludge -- arsenite oxidation -- electron acceptor -- nitrate -- dynamic modeling; Environmental engineering -- Periodicals; Environmental protection -- Periodicals; 628.05
• DOI: 10.1080/09593330.2016.1245362
• Languages: English
• ISSNs: 0959-3330

Abstract

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 As III L −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 ( q obs, max ) with nitrate and nitrite as the electron acceptors were found to be 0.55 ± 0.10 mg As III g −1 VSS min −1 and 0.40 ± 0.04 mg As III g −1 VSS min −1, respectively.