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The use of poly-lactic acid and poly-(ε-caprolactone) biodegradable polymers to design controlled-release KMnO4 structures for water remediation
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The use of poly-lactic acid and poly-(ε-caprolactone) biodegradable polymers to design controlled-release KMnO4 structures for water remediation
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Dissertation
The use of poly-lactic acid and poly-(ε-caprolactone) biodegradable polymers to design controlled-release KMnO4 structures for water remediation
2016
Overview
Controlled-release biodegradable polymers (CRBP’s) are an in-situ water remediation technology with potential use in managing the oxidation rate of contaminants in aquifer treatment systems. Hydrolysable polyesters are the key component to these structures, as their porosity and ester chain cleavage in aqueous environments allow for slow, sustained oxidant delivery to target sites while eliminating the need for physical removal of the CRBP system from the subsurface. Further slowing chemical release using multiple biodegradable polymers could improve the efficiency of these systems by providing a means of better controlling the chemical oxidation reaction and extending release duration. In this study, 3D printed poly-lactic acid (PLA) structures were used to partially coat a previously designed CRBP (which consisted of solid KMnO4 encapsulated in a poly-(ϵ-caprolactone), or PCL, matrix). Batch release studies were conducted in deionized water and were followed by a one-way ANOVA statistical analysis and post hoc Tukey test to assess significant differences in release kinetics due to PLA shells. A subsequent bacterial inactivation study was also conducted to investigate the ability for these designed structures to remediate high strength wastewater. Results from the statistical analysis revealed that by limiting PCL exposure to a single planar surface (Design 1) a statistically significant reduction in daily oxidant release can be achieved with p-values much lower than a 0.05 significance level. Additionally, it was found that changes in oxidant release rate compared to the control were dependent upon whether PLA shells facilitated KMnO4 diffusion through planar or curved PCL surfaces. Differences in bacteria reductions in wastewater samples treated with Design 1 and the control CRBP appeared to be insignificant following 48 hours of remediation. This suggested that these core and shell structures could be used to significantly reduce oxidant diffusion without significantly reducing remediation efficiency. While further research must be conducted to elucidate properties and limitations of these structures, these findings are promising for use in groundwater treatment systems requiring slower oxidant release due to aquifer properties (especially, natural oxidant demand).
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
1369191227, 9781369191226
