Language: English
Presenter: Jack Shore (REGENESIS)
In situ remediation of organic contaminants can become much more challenging when treatment is required within bedrock aquifers. The added challenges include:
- Contaminant distribution within fracture networks and the rock matrix
- Back diffusion of contamination from the primary porosity, during remediation
- Understanding contaminant flux, a function of groundwater velocity and contaminant concentration; and how that effects remedial design
- Wide ranges of concentrations, including the presence of Dense Non-Aqueous Phase Liquid
- Drilling and application costs in bedrock, at depth.
The webinar covers the challenges of the treatment within bedrock aquifers and discusses appropriate resources to help with the design of site investigations for fractured bedrock sites, enabling the deployment of robust in situ remediation and validation strategies.
Jack Shore explains how a range of engineered injectable substrates can be used to overcome these challenges; focusing on in situ anaerobic and aerobic biological degradation, sorption using micron-scale colloidal activated carbon, enhanced desorption coupled with vacuum extraction and in situ chemical oxidation.
The successful use of these techniques, used alone and in combination, is demonstrated through the presentation of four case studies of the in situ remediation of sites impacted with chlorinated solvents, petroleum hydrocarbons and hexavalent chromium. The case studies also present remediation within different bedrock geologies.
The webinar is useful to anyone considering remedial options for sites underlain with bedrock, provides concepts to consider, and examples of remedial options in a variety of situations.
