Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 29, Issue 2, Pages 3141-3146Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-17394-6
Keywords
Persulphate; Soil; Groundwater; Remediation; Respirometry; Chemical oxidation
Categories
Funding
- ERS
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This study demonstrates the use of an automated respirometer measuring CO2 production as a rapid and reliable method for selecting activator type and concentration in ISCO projects, providing greater confidence in treatability testing and reagent efficiency.
In situ chemical oxidation (ISCO) is a popular remediation technique for hydrocarbon-contaminated soil and groundwater. A range of oxidising agents and activators are available for ISCO; however, selection is usually based on contaminant destruction which is time-consuming and impacted by sample heterogeneity based on 1-10 g sample contaminant analysis. In this paper, we demonstrate the use of an automated respirometer, measuring CO2 production, as a rapid and reliable approach for activator type and concentration selection. The approach is demonstrated based on tests in matrices of different types (loam soil and sand). In both matrices, CO2 production was significantly increased following sodium persulphate (SPS) oxidation with iron activation in a concentration-dependant manner. Alkaline activation led to no increased CO2 production compared to SPS addition without activation. The approach will provide greater confidence in treatability testing and reagent efficiency in ISCO projects.
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