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Reverse osmosis concentrate treatment by chemical oxidation and moving bed biofilm processes
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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.
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VENDRAMEL, S.M.R., et al. Reverse osmosis concentrate treatment by chemical oxidation and moving bed biofilm processes. Water Science and Technology. 2013. Vol. 68, num. 11, pags. 2421-2426. ISSN 0273-1223. [consulted: 16 of August of 2026]. Available at: https://hdl.handle.net/2445/158562