Chemical technologies

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