GeoStream's chemical technologies

GeoStream as your single source provider is not stuck to one technology or approach, and will assess each site on its own merits. Where chemical technologies are the chosen solution, we offer a portfolio of field and regulatory proven, sustainable technologies that deliver groundwater and soil remediation for both in-situ and ex-situ applications. Our specialist team of design staff work alongside your project team ensuring our solutions offer maximum efficiency, cost effectiveness and most importantly are acceptable to regulators.

Our process based plant, chemical oxidation and bioremediation technologies provide a fully integrated solution for your site, ensuring rapid, cost-effective treatment of a wide range of organic compounds and heavy metals.

The illustration below provides the cost value basis for technology selection.

Chemical technologies chart 1

We have a selection of chemical technologies exclusively available which are tried, tested and approved by regulators to deal with all contaminants typically encountered. Provided below is a summary table with more detailed technical information on individual solutions.

Chemical technologies summary table

The technologies and treatments

The innovative Trap & Treat® BOS 100® and BOS 200® products offer environmentally-friendly solutions for soil and groundwater contamination. BOS 100® ‘traps’ chlorinated solvent contaminants, then treats them with a safe, effective reductive dechlorination process. BOS 200® breaks down contamination with a specially formulated blend of activated carbon, sulphate reduction media, micronutrients and facultative microbes.

Benefits:

  • The result is predictable in terms of outcome, time and cost
  • Rapidly reduces dissolved phase contaminant levels in days/weeks
  • Ease of application via direct push technology
  • Single product/application provides both trap and treat
  • Suitable to address contaminant migration at site boundary or near sensitive receptors
  • Suitable for both source (NAPL) and plume zone treatment
  • Greater certainly in achieving stringent clean-up standards
  • Suitable for addressing free phase, dissolved phase contamination as well as matrix back diffusion, i.e. rebound
  • Catalogue of experience demonstrating successful treatment using this technology

In-situ chemical oxidation (ISCO) involves the injection or direct mixing of reactive chemical oxidants into groundwater and soil for the primary purpose of rapid and complete contaminant destruction.

Benefits:

  • Chemical destruction, where chemical reactions destroy contaminants on contact
  • Treats a wide range of contaminants
  • Capable of treating moderate to high levels of contamination, including free phase
  • Rapid treatment time frame, weeks to months
  • Used for saturated and unsaturated zone treatment
  • Application frequency, multiple applications required

Chemical technologies available include sodium and potassium permanganate, sodium persulphate and hydrogen peroxide.

Bioremediation refers to the degradation of organic contaminants in soil or groundwater by indigenous or transplanted/acclimated microorganisms. Environmental conditions can be altered by the addition of electron acceptors/donors to support and enhance the rate of bioremediation. Bioremediation is used to target both in-situ and ex-situ contamination in both soil and groundwater.

Benefits:

  • Biological degradation designed to target both total petroleum hydrocarbon (TPH) or chlorinated hydrocarbon compounds
  • Site specific engineered solutions to ensure optimum conditions suitable for remediation at the subject site
  • Increase in degradation rates allows for more rapid site sign-off
  • Minimal disturbance for the duration of treatment and full access for site works to process once treatment complete
  • No ongoing operation and maintenance costs

Biological treatment technologies available include:

  • sodium persulphate and calcium peroxide combined (OBC)
  • anaerobic oxidation using soluble sulphates (OBC+)
  • a patented mix of lactates, fatty acids, alcohols and buffer in Anaerobic Biochem (ABC)
  • the emulsified version ABC ole or including zero valent iron ABC + and CAP 18