Geochemical implications of brine leakage into freshwater aquifers.

摘要: CO(2) injection into deep saline formations as a way to mitigate climate change raises concerns that leakage of waters from the will impact water quality overlying aquifers, especially underground sources drinking (USDWs). This paper aims characterize geochemical composition brines, with focus on constituents pose human health risk and are regulated by U.S. Environmental Protection Agency (USEPA). A statistical analysis NATCARB brine database, combined simple mixing model calculations, show total dissolved solids concentrations chloride, boron, arsenic, sulfate, nitrate, iron manganese may exceed plant tolerance or regulatory levels. Twelve agricultural crops evaluated for decreased productivity in event would experience some yield reduction due increased TDS at brine-USDW ratios < 0.1, 50% 0.2 ratio. ratio low 0.004 result most sensitive crops. The USEPA secondary standard is exceeded fraction approximately 0.002. To our knowledge, this first study consider impacts leakage, even though withdrawals groundwater United States almost three times higher than public domestic withdrawals.