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STABILIZED HYDROGEN PEROXIDE FOR THE REMEDIATION OF HYDROCARBONS AND MTBE IN HIGH TEMPERATURE AND SALINE GROUNDWATER
Kashir, M. and R. McGregor.
Remediation 29(1):27-36(2019)

A field pilot-scale test was conducted to determine whether citric acid-stabilized hydrogen peroxide (H2O2) was effective to remediate dissolved petroleum hydrocarbon compounds and MTBE in impacted high-salinity groundwater. The test was carried out adjacent to an operational hydrocarbon fuel facility in Western Saudi Arabia. A 7.5% weight H2O2 solution was injected into a series of injection wells positioned to target the plume within an unconfined aquifer. The plume contains total BTEX at concentrations ≤6,890 g/L. MTBE was detected at concentrations ≤55,182 µg/L. A total of 9,012 L citric acid-stabilized H2O2 solution was injected over three events spaced over a 1-month period. Results indicated that the average concentration decrease was 72% for total BTEX and ≤85% for MTBE. Water quality, pH, oxidation-reduction potential, and dissolved oxygen did not fluctuate significantly between pre- and post-injection. Post-injection microbiological community measurement indicated that the community diversity and biomass were reduced with a shift to a more aerobic population. Results of compound-specific isotope analyses showed petroleum hydrocarbon and MTBE degradation.



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