Ex-Situ Chemical Oxidation
Ex-Situ Chemical Oxidation
Well-Site & Drilling Waste Disposal Area
Location: Wellsite – Central Alberta
When: 2015
Contaminant of Concern: BTEX, F1, F2
Impacted Media and Volume: 1,900 m3 impacted stockpiled soil
Tasks: Remedial Planning, Detail design, Procurement, Blending and Field applications
The Problem
Previously excavated soil was stockpiled on-site. Contaminants in the soil included BTEX, F1, and F2. A total of 1,900 m3 of low to moderate PHC impacted mineral soil was stockpiled and 600 m3 of heavily contaminated organic/ topsoil was stockpiled separately.
The Approach
Mineral soils and organic soils were segregated due to high variability amongst the two piles for PHC concentrations. A specialized mulcher was used for the project in order to ensure the greatest contact between the oxidant and the impacted soils.
Mineral soils had a total of three passes with 56,150 kg of 50% EHP (enhanced hydrogen peroxide) applied. Pilot test on the organic soils had a total of three passes and 3,600 kg of 50% EHP (enhanced hydrogen peroxide) applied.
The Results
Treatment of soils was completed in less than 1 month
All 1,900 m3 of mineral soil was remediated to below applicable guidelines
Organic soils were unable to be remediated to below criteria but had an overall reduction of greater than 40% after three passes
Mineral soils were backfilled and organic soils were left in place for further soil management