Print Email Facebook Twitter Removal of Hydrogen Peroxide Residuals and By-Product Bromate from Advanced Oxidation Processes by Granular Activated Carbon Title Removal of Hydrogen Peroxide Residuals and By-Product Bromate from Advanced Oxidation Processes by Granular Activated Carbon Author Wang, F. (TU Delft Sanitary Engineering; Shanghai University) Zhang, Lu (Shanghai University) Wei, L. (TU Delft Sanitary Engineering) van der Hoek, J.P. (TU Delft Sanitary Engineering; Waternet) Date 2021 Abstract During drinking water treatment, advanced oxidation process (AOP) with O3 and H2O2 may result in by-products, residual H2O2 and BrO3−. The water containing H2O2 and BrO3− often flows into subsequent granular activated carbon (GAC) filters. A concentrated H2O2 solution can be used as GAC modification reagent at 60 °C to improve its adsorption ability. However, whether low concentrations of H2O2 residuals from AOP can modify GAC, and the impact of H2O2 residuals on BrO3− removal by the subsequent GAC filter at ambient temperature, is unknown. This study evaluated the modification of GAC surface functional groups by residual H2O2 and its effect on BrO3− removal by GAC. Results showed that both H2O2 and BrO3− were effectively removed by virgin GAC, while pre-loaded and regenerated GACs removed H2O2 but not BrO3− anymore. At the ambient temperature 150 µmol/L H2O2 residuals consumed large amounts of functional groups, which resulted in the decrease of BrO3− removal by virgin GAC in the presence of H2O2 residuals. Redox reactions between BrO3− and surface functional groups played a dominant role in BrO3− removal by GAC, and only a small amount of BrO3− was removed by GAC adsorption. The higher the pH, the less BrO3− removal and the more H2O2 removal was observed. Subject BromateGranular activated carbonHydrogen peroxideOzoneSurface functional groups To reference this document use: http://resolver.tudelft.nl/uuid:120f593c-1522-439f-8e15-8fab9d429ffd DOI https://doi.org/10.3390/w13182460 ISSN 2073-4441 Source Water, 13 (18) Part of collection Institutional Repository Document type journal article Rights © 2021 F. Wang, Lu Zhang, L. Wei, J.P. van der Hoek Files PDF water_13_02460_v2.pdf 7.42 MB Close viewer /islandora/object/uuid:120f593c-1522-439f-8e15-8fab9d429ffd/datastream/OBJ/view