Reductive dechlorination is generally a slower process than chemical oxidation. It can be a more cost-effective alternative when rapid site closure is not required.
ORIN utilizes two primary reductive dechlorination strategies, biological treatment and iron based reactions.
Biological treatment is achieved by creating anaerobic conditions within the treatment zone and encouraging microbial activity within that environment. As cell growth is stimulated in the anaerobic environment, contaminants function in metabolic pathways for cellular respiration. Electron transfer during these cellular processes facilitates removal of the chloride ion and the remaining non-chlorinated compound is consumed by the microorganisms.
Iron based reactions center around the use of zero valent iron. Combined with specific catalyzing chemistries, the zero valent iron facilitates electron transfer in order to produce hydrogen in close proximity to the chlorinated contaminants. The hydrogen generated in these reactions replaces chloride ions on the contaminant. The remaining organic compounds can then be degraded by normally occurring microorganisms.
Biological and Iron Based Dechlorination Strategies
ORIN has experienced great success by combining biological and zero valent iron based dechlorination strategies. By utilizing a proprietary blend of water-soluble nutrients and suspended zero valent iron, ORIN provides the benefit of immediate anaerobic and reductive conditions to facilitate electron transfer coupled with long-term anaerobic biological activity facilitated by our special blend of nutrients.
- Chlorinated solvents
- Some chlorinated aromatics
- Inorganics (e.g. nitrate and perchlorate)