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BIOLOGICAL REDUCTION OF NITRATE AND PERCHLORATE IN SOIL MICROCOSMS: AN ELECTRON DONOR COMPARISON OF GLYCEROL, EMULSIFIED OIL, AND MULCH EXTRACT
Sarria, M., J.M. Gonzales, D. Gerrity, and J. Batista.
Groundwater Monitoring & Remediation 39(2):32-42(2019)
Soil microcosms augmented with emulsified oil (EO), glycerol, and mulch extract were conducted to compare standard versus slow-release electron donors for sequential nitrate and perchlorate biological reduction. Results indicated that EO and glycerol spiked at ~100 times stoichiometric excess achieved similar overall reductions and degradation rates for nitrate and perchlorate. Perchlorate exhibited first-order kinetics, with a rate constant of 0.36/day for both EO and glycerol. Stable chemical oxygen demand (COD) concentrations highlighted the slow-release properties of EO, which would reduce electron donor consumption in comparison to soluble substrates in soil remediation applications. The microcosms augmented with mulch extract failed to demonstrate any nitrate or perchlorate reduction due to the extract's lower COD concentration and would require compost or additional processing for the extract to be a viable alternative.
Groundwater Monitoring & Remediation 39(2):32-42(2019)
Soil microcosms augmented with emulsified oil (EO), glycerol, and mulch extract were conducted to compare standard versus slow-release electron donors for sequential nitrate and perchlorate biological reduction. Results indicated that EO and glycerol spiked at ~100 times stoichiometric excess achieved similar overall reductions and degradation rates for nitrate and perchlorate. Perchlorate exhibited first-order kinetics, with a rate constant of 0.36/day for both EO and glycerol. Stable chemical oxygen demand (COD) concentrations highlighted the slow-release properties of EO, which would reduce electron donor consumption in comparison to soluble substrates in soil remediation applications. The microcosms augmented with mulch extract failed to demonstrate any nitrate or perchlorate reduction due to the extract's lower COD concentration and would require compost or additional processing for the extract to be a viable alternative.
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