title: Reverse osmosis concentrate treatment by chemical oxidation and moving bed biofilm processes.
abstract: In the present work, four oxidation techniques were investigated (O3, O3/UV, H2O2/O3, O3/H2O2/UV) to pre-treat reverse osmosis (RO) concentrate before treatment in a moving-bed biofilm reactor (MBBR) system. Without previous oxidation, the MBBR was able to remove a small fraction of the chemical oxygen demand (COD) (5-20%) and dissolved organic carbon (DOC) (2-15%). When the concentrate was previously submitted to oxidation, DOC removal efficiencies in the MBBR increased to 40-55%. All the tested oxidation techniques improved concentrate biodegradability. The concentrate treated by the combined process (oxidation and MBBR) presented residual DOC and COD in the ranges of 6-12 and 25-41 mg L(-1), respectively. Nitrification of the RO concentrate, pre-treated by oxidation, was observed in the MBBR. Ammonium removal was comprised between 54 and 79%. The results indicate that the MBBR was effective for the treatment of the RO concentrate, previously submitted to oxidation, generating water with an improved quality.
authors: Instituto Federal de Educação, Ciência e Tecnologia do Rio de Janeiro, Campus Maracanã, Rua Senador Furtado, 124, Rio de Janeiro, Brasil E-mail: simone.vendrame@ifrj.edu.br.
authors: S M R
authors: SM
authors: Vendramel
authors: Department of Chemical Engineering, University of Barcelona. C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors: A
authors: A
authors: Justo
authors: Department of Chemical Engineering, University of Barcelona. C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors: O
authors: O
authors: González
authors: Department of Chemical Engineering, University of Barcelona. C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors: C
authors: C
authors: Sans
authors: Department of Chemical Engineering, University of Barcelona. C/Martí i Franquès 1, 08028 Barcelona, Spain.
authors: S
authors: S
authors: Esplugas
mesh_terms: D064751:Ammonium Compounds / Q000302:isolation & purification; D018441:Biofilms; D018533:Biomass; D019149:Bioreactors; D006861:Hydrogen Peroxide; D009930:Organic Chemicals / Q000302:isolation & purification; D009995:Osmosis; D010084:Oxidation-Reduction; D010126:Ozone; D014466:Ultraviolet Rays; D018508:Water Purification
chemical_list: D064751:Ammonium Compounds; D009930:Organic Chemicals; D010126:Ozone; D006861:Hydrogen Peroxide