Controlling arsenic mobilization during managed aquifer recharge: The role of sediment heterogeneity

Environmental Science & Technology
Sarah FakhreddineScott Fendorf

Abstract

Managed aquifer recharge (MAR) enhances freshwater security and augments local groundwater supplies. However, geochemical and hydrological shifts during MAR can release toxic, geogenic contaminants from sediments to groundwater, threatening the viability of MAR as a water management strategy. Using reactive transport modeling coupled with aquifer analyses and measured water chemistry, we investigate the causal mechanisms of arsenic release during MAR via injection in the Orange County Groundwater Basin. Here, injection water is oxygenated, highly-purified recycled water produced by advanced water treatment. Injection occurs via an injection well screened at several depth intervals ranging from 160  365 m, allowing recharge into multiple confined horizons (zones) of the aquifer system. However, these zones are characterized by varying degrees of prior oxidation due to historic, long-term infiltration from the overlying aquifer. The resulting sediment geochemical heterogeneity provides a critical control on the release (or retention) of arsenic. In zones with prior oxidation, As mobilization occurs via arsenate desorption from Fe-(hydr)oxides, primarily associated with shifts in pH; within zones that remain reduced prior to inje...Continue Reading

References

Mar 27, 2003·Ground Water·H PrommerC Zheng
May 6, 2005·Environmental Science & Technology·Henning Prommer, Pieter J Stuyfzand
Aug 11, 2010·Environmental Science & Technology·Carlos DescourvieresNiels Hartog
Jun 19, 2012·Journal of Environmental Monitoring : JEM·Chelsea W NeilYoung-Shin Jun
Oct 31, 2012·Ground Water·June E MireckiMarie C López-Baláez
Jun 10, 2015·Environmental Science & Technology·Sarah FakhreddineScott Fendorf
Nov 2, 2018·Environmental Science & Technology·Henning PrommerRyan Morris

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Citations

Jan 28, 2021·Environmental Science & Technology·Sarah FakhreddineJean-Philippe Nicot
Jan 16, 2021·Journal of Hazardous Materials·Maria BattistelMassimo Rolle
Nov 29, 2020·Journal of Hazardous Materials·Md Aminur RahmanRavi Naidu
Nov 6, 2021·Environmental Science. Processes & Impacts·Adam J SiadeHenning Prommer

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