| Contributor:
Scott R. Mullin Business Title: Great Lakes District Manager Contact Information:
|
|||
| Title
of Paper: Time-Release Electron Donor Technology: Results of
Forty-Two field Applications Authors: Stephen S. Koenigsberg, Craig A. Sandefur, and Scott R. Mullin Key Words: bioattenuation, treatment, groundwater, polyactate ester, Hydrogen Release Compound, HRCâ, chlorinated hydrocarbons, nitroaromatics, oxyanions, contaminants Abstract: Hydrogen Release Compound (HRCâ) is a food grade, polylactate ester that, upon being deposited into the aquifer, is slowly hydrolyzed to release lactic acid and other organic acid derivatives. The organic acids are fermented to hydrogen, which in turn donates electrons that drive reductive bioattenuation processes. HRC delivers electrons in a time-release fashion for about one year. The material is applied to the aquifer by push-point injection or backfill-auguring and is normally indicated for treatment dissolved phase plumes and hydrophobically sorbed contaminant. It has long been known that enhancing bioremediation can facilitate desorbtion of the residual, sorbed phase; now this has been specifically established in an HRC-mediated environment. HRC has now been used on over 150 sites, which we believe make it the most widely used electron donor for accelerating bioattenuation. Overall and representative site results are discussed. |