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Time-Release Electron Donor Technology for the Accelerated Bioremediation of Perchlorates

Time-Release Electron Donor Technology for the Accelerated Bioremediation of Perchlorates. Rick Gillespie Steve Koenigsberg REGENESIS Bioremediation Products Presented at the 5th Annual P2 and Hazardous Waste Management Conference. Hydrogen Release Compound, HRC. TM.

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Time-Release Electron Donor Technology for the Accelerated Bioremediation of Perchlorates

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  1. Time-Release Electron Donor Technology for the Accelerated Bioremediation of Perchlorates Rick Gillespie Steve Koenigsberg REGENESISBioremediation Products Presented at the 5th Annual P2 and Hazardous Waste Management Conference

  2. Hydrogen Release Compound, HRC TM • HRC is a polylactate ester • When hydrated, HRC time-releases lactic acid • HRC accelerates anaerobic bioremediation of PCE, TCE, and TCA. • HRC can reduce perchlorates, nitrate, Cr(VI) • Microbes metabolize lactic acid to other organic acid intermediates, such as acetic acid • Hydrogen is released as a by-product • This hydrogen serves as the electron donor

  3. HRC Polylactate Ester Structure Patented Time-Release Formula • HRC is based on a three-carbon glycerol polylactate ester structure: • HRC releases lactic acid for up to one year • By providing a long-lasting, time-released hydrogen source, HRC cost-effectively accelerates anaerobic bioremediation

  4. HRC Polylactate Ester Structure • Polylactate esters are formed by linkages between lactic acid complexes and and a core molecule that contains alcohol groups • A condensation reaction forms the ester linkage:

  5. Using HRC to Promote Anaerobic Bioremediation of Perchlorates • HRC, once deposited into the subsurface, slowly releases lactic acid. • Anaerobic bacteria metabolize the lactic acid as a nutrient source. • Hydrogen is released as a byproduct and can be used to enhance anaerobic bioremediation.

  6. HRC Field Application HRC is a viscous but injectable substance. HRC is injected into the aquifer using direct-push technologies.

  7. HRC Application • Delivery Systems - bore-hole backfill or injection via direct-push technologies • Designs for Barriers and Source Treatment • 1. Upgradient 1 2 3 4 • Barrier • 2. Series of • Barriers • 3. Downgradient • Barrier • 4. “Grid” of HRC • injection points

  8. The Benefits of a Persistent, Time-Release Hydrogen Source • Allows for passive remediation • Cost-Effective • Reduces capital costs in comparison with other technologies • Remains in place for continuous hydrogen delivery, for continued savings on O&M costs • Non-invasive, leaves no above-ground disturbance • Eliminates oxygen introduction which can occur with repeated fluid application using mechanical methods • May favor reductive dechlorination over possible competing methanogenic activity

  9. For More Information REGENESIS Bioremediation Products (972)377-7288 www.regenesis.com

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