title: Inhibitory effect of the xenobiotic 1,2-dichloroethane in a nitrifying biofilm reactor.
abstract: The aim was to investigate the inhibitory effect of the xenobiotic 1,2-DCA on nitrification during the cometabolic degradation in a packed bed nitrifying biofilm reactor. This xenobiotic inhibited primarily the conversion of NH4-N to hydroxylamine by binding to the AMO enzyme. It had no inhibitory effect on the conversion of nitrite to nitrate. At high NH4-N loadings, the presence of 1,2-DCA inhibited NH4-N utilisation more severely than at low loadings. The suppressing effect of 1,2-DCA on NH4-N utilisation was found to be reversible due to the ability of cells to recover from inhibition. These results could fill a gap in the literature about the potential use of nitrifying biofilm systems for cometabolic treatment of 1,2-DCA and could be useful in the design of engineered 1,2-DCA remediation/treatment in biofilm reactors.
authors.affiliation: Department of Environmental Engineering, University of Marmara, Kuyubasi, Istanbul, Turkey. alpaslan@eng.marmara.edu.tr
authors.forename: B Alpaslan
authors.initials: BA
authors.lastname: Kocamemi
authors.forename: F
authors.initials: F
authors.lastname: Ceçen
mesh_terms: D001419:Bacteria / Q000187:drug effects* / Q000378:metabolism; D018441:Biofilms; D019149:Bioreactors; D005025:Ethylene Dichlorides / Q000494:pharmacology*; D009566:Nitrates / Q000378:metabolism; D009573:Nitrites / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology; D015262:Xenobiotics
chemical_list: D005025:Ethylene Dichlorides; D009566:Nitrates; D009573:Nitrites; D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D015262:Xenobiotics; C024565:ethylene dichloride