Thesis
Effect of persulfate formulations on soil permeability
Washington State University
Master of Science (MS), Washington State University
2010
Handle:
https://hdl.handle.net/2376/103205
Abstract
In situ chemical oxidation (ISCO) using persulfate is a promising technique for the remediation of soil and groundwater contaminants. Persulfate activated by iron (III)-EDTA or sodium hydroxide can accelerate the degradation of contaminants. However, in previous studies of ISCO remediation processes, the application of ISCO chemicals has been limited by low permeability zones. Three persulfate process conditions typically used in the field were used in laboratory studies to investigate the effect of unactivated and activated persulfate formulations on the permeability of a suite of subsurface solids. Column tests were conducted via a falling head permeameter for commercial silica sand and a flexible wall permeameter was used for kaolinite and two natural soils to quantify changes in hydraulic conductivity after the application of persulfate formulations. Unactivated persulfate and iron (III)-EDTA-activated persulfate had minimal effect on the permeability of all four soils. Base-activated-persulfate increased the permeability of kaolinite and the natural soils, but decreased the permeability of sand. Changes in soil dispersion, flocculation, and surface charge may have contributed to changes in soil permeability. X-ray computed tomography (XRCT) was used to investigate the effect of persulfate formulations on soil structure. The porosity of the soil samples treated by persulfate solutions was not distributed uniformly with depth as that of dry soil samples, and minimum, nor mean porosity of the soils did not correlate with changes in hydraulic conductivity.
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Details
- Title
- Effect of persulfate formulations on soil permeability
- Creators
- Miao Yu
- 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, Wash. :
- Identifiers
- 99900525025501842
- Language
- English
- Resource Type
- Thesis