title: New urban wastewater treatment with autotrophic membrane bioreactor at low chemical oxygen demand/N substrate ratio.
abstract: The potential for total nitrogen removal from municipal wastewater has been evaluated in an autotrophic membrane bioreactor running with a low chemical oxygen demand (COD)/N ratio to simulate its combination with an upstream physicochemical process that retains a large proportion of organic matter. The tests were conducted in a laboratory scale submerged membrane bioreactor loaded with a synthetic influent. Nitrogen loading rate was 0.16 kgN-NH4+.m(-3).d(-1) and sodium acetate was added as a carbon source. Results have shown that nitrogen elimination can reach 85% for a COD/N ratio of 5, with COD removal exceeding 97%. However, a COD/N ratio of 3.5 was found to be the limiting factor for successfully reaching the overall target value of 10 mgN.L(-1) in the effluent. Nevertheless, low COD/N ratios make it possible to work with low total suspended solid concentrations in the bioreactor, which greatly facilitates membrane fouling control by a simple aeration and backwashing strategy.
authors.affiliation: Institut Européen des Membranes, CNRS, UMR 5635, Université Montpellier II, Montpellier, France E-mail: heran@um2.fr.
authors.forename: Y
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Institut Européen des Membranes, CNRS, UMR 5635, Université Montpellier II, Montpellier, France E-mail: heran@um2.fr.
authors.forename: G
authors.initials: G
authors.lastname: Lesage
authors.affiliation: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne, F-11100, France.
authors.forename: M
authors.initials: M
authors.lastname: Barret
authors.affiliation: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne, F-11100, France.
authors.forename: N
authors.initials: N
authors.lastname: Bernet
authors.affiliation: Institut Européen des Membranes, CNRS, UMR 5635, Université Montpellier II, Montpellier, France E-mail: heran@um2.fr.
authors.forename: A
authors.initials: A
authors.lastname: Grasmick
authors.affiliation: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne, F-11100, France.
authors.forename: J
authors.initials: J
authors.lastname: Hamelin
authors.affiliation: Institut Européen des Membranes, CNRS, UMR 5635, Université Montpellier II, Montpellier, France E-mail: heran@um2.fr.
authors.forename: M
authors.initials: M
authors.lastname: Heran
mesh_terms: D052818:Autotrophic Processes; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D008567:Membranes, Artificial; D008962:Models, Theoretical; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D008567:Membranes, Artificial; D009584:Nitrogen