Abstract
AbstractCarbon dioxide (CO2) presents an interesting alternative to air as a gas for in situ sparging because it acts as a weak acid that can lower groundwater pH. Through a proof of concept or pilot-scale test, in situ sparging of gaseous CO2 was demonstrated to be an effective means to neutralize a caustic brine plume (CBP) and to reduce concentrations of mercury and other heavy metals. The plume exhibits high pH levels ranging from 10.5 to 12.0, densities as high as 1.06 g/mL, and mercury ranging from 50 to 1,000 μg/L. The plume lies at the base of a moderately permeable aquifer at depths ranging from 9.1 to 15.2 m (30 to 50 ft) below ground surface. The proof of concept test involved 2 sparge wells and 13 monitoring wells installed at varying depths and radial distances up to 30.5 m (100 ft). Monitoring wells were equipped with data-logging field electrodes to continuously monitor pH and automatic data loggers to monitor water level mounding and collapse during intermittent sparging operations. The ...
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