PHC Remediation Using A Permeable Reactive Zone

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  2. PHC Remediation Using A Permeable Reactive Zone In Nepean, Ontario
Brief

At an active gas bar in Nepean, Ontario, assessments determined that the groundwater was impacted with petroleum hydrocarbons (PHCs). To mitigate the potential risks and liability, IRSL was contracted to implement a permeable reactive barrier (PRB) to treat the groundwater prior to it flowing off site.

The small working area of the active facility required a very small footprint. Sub-zero temperatures were encountered and the active gas bar had high volumes of traffic.

Process

IRSL addressed the dissolved PHC impacts by injecting a combination of electron acceptors and colloidal activated carbon (CAC) using direct push technology (DPT). The CAC, was used to adsorb the PHCs in the groundwater and the electron accepters were used to enhance the biodegradation of the PHCs.

The mass flux of PHCs flowing across the property boundary was calculated and a design based on the flux was developed. The PRZ was completed using 22 direct push points over a 1-day period. Flow rate, injection pressure, total volume, reagent masses, solution was all tracked for each point.

Results

The PRB was installed on time and budget without affecting gas bar opperations.

The flux of PHCs was reduced by greater than 99.4%.

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