title: The fate of H2O2 during managed aquifer recharge: A residual from advanced oxidation processes for drinking water production.
abstract: The fate of H2O2 residual from advanced oxidation process (AOP) preceding managed aquifer recharge (MAR) is of concern because H2O2 could lead to undesired effects on organisms in the MAR aquatic and soil ecosystem. The objective of this study was to distinguish between factors affecting H2O2 decomposition in MAR systems, simulated in batch reactors with synthetic MAR water and slow sand filter sand. The results showed that pure sand and soil organic matter had no considerable effect on H2O2 decomposition, whereas naturally occurring inorganic substances on the surface of sand grains and microbial biomass are the two main factors accelerating H2O2 decomposition in MAR systems. Additionally, the results showed that the H2O2 decompositions with different initial concentrations fitted first-order kinetics in 2-6 h in a mixture of slow sand filter sand (as a substitute for sand from a MAR system) and synthetic MAR water with high bacterial population. An estimation indicated that low concentrations of H2O2 (<3 mg/L) could decompose to the provisional standard of 0.25 mg/L in the first centimeters of MAR systems with the influent water containing high microbial biomass 38 ng ATP/mL.
authors.affiliation: Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands. Electronic address: f.wang-2@tudelft.nl.
authors.forename: F
authors.initials: F
authors.lastname: Wang
authors.affiliation: Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands.
authors.forename: D
authors.initials: D
authors.lastname: van Halem
authors.affiliation: Department of Water Management, Faculty of Civil Engineering and Geosciences, Delft University of Technology, PO Box 5048, 2600 GA Delft, The Netherlands; Strategic Centre, Waternet, Korte Ouderkerkerdijk 7, 1096 AC Amsterdam, The Netherlands.
authors.forename: J P
authors.initials: JP
authors.lastname: van der Hoek
mesh_terms: D060766:Drinking Water / Q000032:analysis*; D004784:Environmental Monitoring; D005374:Filtration; D060587:Groundwater / Q000032:analysis* / Q000382:microbiology*; D006861:Hydrogen Peroxide / Q000032:analysis*; D010084:Oxidation-Reduction; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification
chemical_list: D060766:Drinking Water; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide
keywords: Advanced oxidation process; Drinking water production; H(2)O(2) decomposition factors; H(2)O(2) residual; Managed aquifer recharge