Thesis
An innovative peroxygen system in the in situ chemical oxidation (ISCO) destruction of dense nonaqueous phase liquids (DNAPLs)
Washington State University
Master of Science (MS), Washington State University
2014
Handle:
https://hdl.handle.net/2376/100266
Abstract
Destruction of carbon tetrachloride (CT) and perchloroethylene (PCE) dense nonaqueous phase liquids (DNAPLs) was investigated with a little studied oxidant, sodium percarbonate (SPC), which is an anhydrous source of hydrogen peroxide (H2O2). Contaminant mass was followed in the aqueous phase, the gas phase, and the DNAPL phase. The net DNAPL mass loss of CT was 81%, and PCE was 27.5% over 96 hours. In the parallel gas purge systems the total CT and PCE DNAPLs mass loss was 5.9% and 21.5%, respectively. To enhance the degradation of the DNAPLs, five different combinations of SPC and base activated sodium persulfate (SPS) was investigated and the maximum CT and PCE DNAPLs mass loss was found to be 94% and 85.5%, respectively, over the same time period of 96 hours. To investigate the potential of SPC as an oxidant in the subsurface, two different systems containing soil with and without soil organic matter (SOM) were observed for the DNAPL amount over 8 hours. Mass of CT DNAPL loss was 62.3% and 59.3%, respectively, for soil with SOM and without SOM. For the PCE DNAPL the percentage loss was 15.4% and 15%, respectively, over the same time period. To improve the destruction of DNAPLs in the soil systems and increase the lifetime of H2O2 in natural soil environments, three different systems of combination of slow release sodium percarbonate and sodium persulfate were investigated. The loss of CT and PCE DNAPLs was 60.5% and 40.5%, respectively, in the most effective systems over 10 days.
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Details
- Title
- An innovative peroxygen system in the in situ chemical oxidation (ISCO) destruction of dense nonaqueous phase liquids (DNAPLs)
- Creators
- Syeed Md Iskander
- Contributors
- Richard J. Watts (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525116501842
- Language
- English
- Resource Type
- Thesis