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DEVELOPMENT OF AN IRON-BASED SOIL MIXING REMEDIATION METHOD FOR ENERGY-EFFICIENT TREATMENT OF CHLORINATED SOLVENTS
Lindh, P., A. Aberg, W. Rankka, F. Burman, C. Toomvali, E. Bergstedt, A. Toft, and K. Hanzi.
NORDROCS 2018: 7th Joint Nordic Meeting on Remediation of Contaminated Sites: Abstracts.

The Danish authority Region Hovedstaden developed and tested a remediation technique based on in situ mixing of a zero-valent iron and bentonite slurry into soil. The technique reduced the presence of chlorinated solvents by chemical oxidation on the iron surfaces. Although mixing reduced the contaminant source term efficiently, the treated soil had reduced strength due to the bentonite amendment, which limited possible soil use alternatives post treatment. In 2017 Region Hovedstaden partnered with the Swedish Geotechnical Institute and the Swedish Geological Survey on a sustainable soil mixing innovation project to improve the geotechnical and energy efficiency performance of the technique and to demonstrate the new functions in situ. The project consists of two different phases: a lab phase in 2018 to study how different binder combinations affect strength and the chemical degradation efficiency of TCE, and a pilot phase in 2019 to test the improved technique at two field sites. The final aim is to produce a technical guideline for stakeholders to facilitate acceptance and implementation of the technique. Selected binder recipes are presented that will be tested on Danish and Swedish field sites in 2019. See slides 26-44 at http://nordrocs.org/wp-content/uploads/2018/09/Session-B-Remediation-of-Soil-and-Groundwater.pdf.



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