What is in-situ chemical oxidation?
In-situ chemical oxidation (ISCO) is an effective treatment for wide-ranging organic contaminants in both soil and groundwater. When oxidants are added to contaminated soil and groundwater, a chemical reaction occurs that destroys contaminants and produces harmless by-products. Essentially, oxidants are delivered to the subsurface under pressure using an injection rig or delivered by gravity to previously installed screened boreholes.
The injection boreholes are installed at different depths in the source area to reach as much dissolved and undissolved contamination as possible. Once the oxidant is pumped down the wells, it spreads into the surrounding soil and groundwater where it mixes and reacts with contaminants. The method adopted for delivery of chemical oxidant depends on site-specific factors such as geological conditions, presence of hardstanding, proximity of buildings and underground services.
Advantages of in-situ chemical oxidation
In-situ chemical oxidation can be used on a wide range of sites and has a number of advantages:
- It is useful for the complete degradation of a wide range of organic contaminants.
- Carried out in-situ so there is no soil excavation and minimal site disturbance.
- Can be used to treat many types of contaminants like fuels, solvents and pesticides.
- Relatively quick process – typically taking a few weeks to reach required targets.
- When handled correctly there is no harm to human health or the environment.
- Cost effective compared to ex-situ remediation methods.
Oxidants used for in-situ chemical oxidation
Various oxidants can be used for ISCO depending on the contaminants targeted and site conditions encountered:
- Hydrogen peroxide
- Fenton’s reagent
- Potassium permanganate
- Activated persulphate
- Proprietary oxidants
Contaminants treatable by in-situ chemical oxidation
Typical contaminants that are amenable to treatment by ISCO include, for example:
- Petroleum hydrocarbons
- Polycyclic aromatic hydrocarbons
- Phenols and cresols
In-situ chemical oxidation case studies
- Groundwater Remediation on a Development Site
- Contaminated Groundwater Remediation, London
- Groundwater Remediation, Merseyside
- Remediation of a Large Development Site
- Groundwater Remediation for Oil and Trichloroethene Contamination
- Remediation of Contaminated Land by In-Situ Chemical Oxidation
- Contaminated Land Remediation on a Housing Development Site
- Remediation of Hydrocarbon Contaminated Groundwater
- Creosote Contaminated Soil and Groundwater Remediation
- Petrol Station Remediation
Telluric Land Remediation has extensive experience of ISCO using a range of chemical oxidants on a variety of industrial sites throughout the UK. We will fully evaluate your site with regard to local geology, contaminant types and concentrations, and any on-going site operational activities. If appropriate we will then design and implement a programme of ISCO that is fully optimised for your site.