Risk Based In-Situ Chemical Oxidation

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Risk Based In-Situ Chemical Oxidation

Urban Mall Parking Lot

  • Location: Confidential Municipality - Southern Alberta

  • When: 2019 and ongoing

  • Contaminant of Concern: Copper

  • Impacted Media and Volume: 1,000 m3 of impacted groundwater

  • Tasks: In-line dilution system, batch mixing, injection, field monitoring, subcontractor management


The Problem

Historical operations in the area had impacted the soil and groundwater creating a large copper plume. Shopping centre infrastructure currently in place limited the remedial strategies available. Soil comprised of sandy gravel and the target treatment zone was fully saturated. Down-gradient of the source plume is a fresh water receptor.


The Approach

Injection program based on 5 meter radius of influence using hydrogen peroxide to catalyze a sequestration reaction and precipitation of dissolved copper. Establish health and safety protocol and site logistics for handling oxidizer and reagents.

Injected approximately 1 million litres of blended hydrogen peroxide and reagents over a 2 month period. Blending is site-specific following TRIUM’s ChemOx® process and requirements for precipitation of copper. Injections were conducted to create a permeable reactive barrier down-gradient of the source zone and adjacent to a water body receptor.


The Results

  • Effective application at the source zone and down-gradient area. Injections are on-going in down-gradient and water body receptor area

  • Very short timeframe of treatment but long lasting reactive barrier (approximately 5 years)

  • No operational shutdowns required at the shopping centre

 
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