The Effect of Ethanol Cosolvency on Benzene
The findings of the solvency study verify previous work; aqueous benzene solubility increases with increasing ethanol volume fraction. The log-linear cosolvency model proved an acceptable model for the data obtained. The percent increases in benzene solubility ranged from 2-13% based on ethanol volume fractions of 0.1--0.7. These data are comparable to Corseuil et al. 2003 results. Increased benzene solubility enhances plume mobility, which in turn creates a much larger contaminated area. The sorption study data, although limited, suggests that soil sorption is decreased as ethanol volume fraction increases. It was found that benzene in the presence of ethanol volume fractions of 0.5 or greater will travel unretarded, which furthermore exacerbates the contamination of the aquifer. The ability of ethanol to enhance plume length solely by increasing solubility and decreasing soil sorption must also be coupled with slower benzene biodegradation rates due to preferential microbial utilization of ethanol. Depending on the location of gasoline blends containing greater than 50% ethanol, remediation costs could be drastically higher.
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ability of ethanol aqueous phase aquifer benzene concentrations Benzene plume Benzene Retardation benzene solubility benzene spill BTEX biodegradation BTEX plume Comparison of retardation containing no ethanol contaminant Control Chart Corseuil cosolvency effect cosolvency power deionized water due to cosolvency due to ethanol E90 sample effect of ethanol ethanol blended gasoline ethanol cosolvency Ethanol fuel ethanol volume fractions following soil sorption fractions of 0.1 Fu and Luthy Gas Chromatograph gasohol gasohol spill gasoline spill groundwater headspace HOCs hydrocarbon hydrophobic impact of ethanol linear log-linear cosolvency model log-linear model mg/L naphthalene NAPL octanol organic compound oxygenated PAHs partition coefficient percent plume after 200 plume containing plume lengths pore volume porosity ppm benzene pure benzene reach the lake retardation with 50 retarded plume solubility increases solubility of benzene solute solvency solvent sorbed sorbent sorption isotherm Sorption samples sorption study subsurface toluene transport vadose zone Yalkowsky