PeroxyChem - Model ELS™ Microemulsion - Enhanced Reductive Dechlorination Systems
ELS™ Microemulsion is a lecithin-based substrate of food-grade carbon used to enhance anaerobic bioremediation. ELS creates reducing conditions and serves as an electron donor for dechlorinating bacteria, promoting enhanced reductive dechlorination reactions. ELS is delivered as a 25% liquid emulsion that is cold water soluble and can be applied via existing wells, hydraulic injection networks, or direct push technology. Lecithin is composed primarily of phospholipids, which have both hydrophilic and hydrophobic regions in their molecular structure. As a result, ELS can be expected to form a more stable emulsion compared to oils that are strictly hydrophobic compounds, making it easy to apply and handle.
- Stimulation of biotic reductive dechlorination
- Structurally bound nutrients phosphorous and nitrogen released to bacteria via the fermentation of the lecithin molecule
- Forms stable emulsions
- Easy to handle and cold water soluble
Anaerobic bioremediation of chlorinated solvents involves the use of the contaminants as the terminal electron acceptor (respiratory substrate) i.e. instead of oxygen, nitrate, sulfate etc. This process could be enhanced by the addition of organic carbon, which serves as an electron donor. The addition of organic carbon to the subsurface will support the growth of indigenous heterotrophic bacteria in the groundwater environment. As the bacteria feed on the carbon, the bacteria consume dissolved oxygen and other electron acceptors, thereby reducing the redox potential in groundwater creating conditions favorable for reductive dechlorination to occur. Furthermore, as the bacteria ferment the organic carbon, they release a variety of volatile fatty acids (VFAs) such as lactic, propionic and butyric acids, which diffuse from the site of fermentation into the groundwater plume and serve as electron donors for other bacteria including dehalogenators and halorespiring species.