Brief

In Toronto, Ontario a pilot scale study was carried out on a source area that had chlorinated volatile organic compounds (CVOCs) groundwater concentrations of trichloroethene (TCE), cis & trans 1,2-dichloroethene (cis & trans 1,2-DCE) and vinyl chloride up to 460,000ug/L, 100,000ug/L and 12,000ug/L respectively. In order to get an understanding for which insitu technology would be most effective for this specific site, IRSL conducted a pilot scale study using a variety of reagents including zero valent iron (ZVI), emulsified vegetable oil (EVO) and colloidal activated carbon (CAC).

Process

The groundwater impacts within the source area were addressed using a combination of adsorption, chemical reduction and enhanced anaerobic bioremediation. IRSL injected a combination of colloidal activated carbon (PlumeStop), hydrogen-releasing materials (HRM), emulsified vegetable oil (EVO) and zero-valent iron (ZVI) to address various source areas. The solutions were injected using both injection wells and direct push technology.

Over the duration of the four-day pilot scale study a total of 192kg of EVO and 225kg of ZVI was injected using direct push technology. 149kg of PlumeStop and 15kg of HRC was injected into injection wells installed in the bedrock.

Results

98% reduction in TCE concentration within overburden.

95% reduction in 1,2 CIS DCE concentraion within overburden.

89% reduction in vinyl chloride concentration within overburden.

98% reduction in TCE concentration within shallow bedrock.

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