Vendramel, S.M.R.Justo Llopis, AnaGonzález Álvarez, ÓscarSans Mazón, CarmeEsplugas Vidal, Santiago2020-05-042020-05-042013-10-250273-1223https://hdl.handle.net/2445/158562In 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.6 p.application/pdfeng(c) IWA Publishing, 2013OzonitzacióOsmosi inversaOzonizationReverse osmosis)info:eu-repo/semantics/article6278972020-05-04info:eu-repo/semantics/openAccess