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BENEFITS OF COMBINING IN SITU CHEMICAL OXIDATION WITH IN SITU STABILIZATION: SYNERGIES AND SOLUTIONS FOR COMPLEX SITES
Pare, J. | SMART Remediation: March 20, 2019, Edmonton, AB, Canada. 15 slides, 2019

In situ solidification/stabilization (ISS) mixes cementitious reagents with contaminated soils to reduce contaminant bioavailability and leachability. Various reagents are used to promote ISS, such as Portland cement, blast furnace slag, and lime kiln dust. Several of these reagents contain calcium oxide, also known as quicklime. High concentrations of organic contaminant can interfere with cementation reactions, requiring excessive application of amendments and increasing both amendment and disposal costs of the displaced soil. This ISS limitation can be minimized by combining the remedy approach with in situ chemical oxidation (ISCO) to degrade some of the organic contaminants present. This presentation explores the advantages and limitations of using a combined ISCO-ISS remedy on contaminated soil from different petroleum hydrocarbon sites, reviewing both current literature and bench and field data. Using common ISS reagents to activate Klozur SP oxidant, the activated SP chemically oxidized a significant portion of the contaminants of concern (COCs) for all the ISCO-ISS treatments. The mass of COCs oxidized increased with increasing SP dose. The lowest molecular weight contaminants were oxidized preferentially. For the same SP dose, combined ISCO/ISS treatment was more effective in reducing contaminant leachability than ISS treatment alone because of the COC removal achieved by the ISCO (activated SP) component. Data are presented from three ISCO-ISS implementation case studies. https://2ziapbmm3zh1x23mj335vjxt-wpengine.netdna-ssl.com/wp-content/uploads/2018/12/SMART-Remediation-Edmonton-2019-Jean-Pare.pdf



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