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    Back Diffusion Explained

    The process of back diffusion and its effect on achieving remedial targets

    Complex, heterogeneous sites can provide a challenge to the achievement of stringent remedial targets for groundwater contamination. The USA’s National Research Council (NRC) has identified back diffusion – also known as matrix back diffusion – as one of the prominent processes that limit our ability to clean up groundwater at those sites. This video explains the process of back diffusion and its effect on achieving remedial targets. Video length: 1m 59s

    In situ remediation using a range of injectable substrates can overcome back diffusion by providing long term treatment of the mobile and immobile porosities in the subsurface. Explore REGENESIS’ technology solutions for contaminated aquifers where back diffusion is a concern:

    PlumeStop Liquid Activated Carbon

    PlumeStop® is a liquid form of activated carbon. It is composed of 1-2μm particles of activated carbon suspended in water through the use of a unique organic polymer dispersion chemistry. Dissolved contaminants are adsorbed onto the surface of the activated carbon biomatrix. Growth of contaminant degrading bacteria on the biomatrix rapidly degrades the adsorbed contaminations, regenerating sorption sites for further contaminant treatment. This results in mobile contaminants being rapidly removed from the risk pathway and degraded at an enhanced rate.

     

    AquiFix, 3-D Microemulsion and S-MicroZVI

    AquiFix™ is a solid, colloidal remediation amendment for the in situ treatment of chlorinated solvent-contaminated aquifers, designed for direct mixing and co-application with PlumeStop. The novel formulation, patent-pending, includes a nutrient-enriched, solid-phase, fatty acid source that quickly establishes and sustains enhanced reductive dechlorination over long timeframes (e.g., ten years post-injection). AquiFix’s optimized hydrogen release profile significantly improves remediation efficacy and reduces life-cycle costs to treat these contaminants.

    3-D Microemulsion® (3DME) an easy-to-apply remedial amendment for the in situ treatment of chlorinated solvent-contaminated aquifers. The patented technology, applied as a micellar suspension, provides a controlled, self-distributing hydrogen source to facilitate biologically mediated enhanced reductive dechlorination. 3-D Microemulsion’s unique chemistry enables its distribution by naturally flowing groundwater while persisting for years after injection, resulting in much greater treatment coverage and faster degradation rates than other electron donor amendments.

    S-MicroZVI® is a colloidal suspension of sulfidated zero-valent iron that promotes the destruction of a wide range of organic pollutants including chlorinated solvents, pesticides, haloalkanes and energetics. S-MicroZVI c is engineered to promote rapid contamination degradation through multiple pathways which leads to faster cleanup while minimizing daughter product formation. Compared to larger particle size ZVI products, S-MicroZVI’s 2-3 micron-sized particles, suspended in a proprietary polymer, make it easy to handle and simple to inject. S-MicroZVI can be co-applied with PlumeStop and AquiFix.

    Do you have questions or want to explore some ideas? Contact Us to get in touch with a local representative.