# Mark F. Roll

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### Investigation of Hydronium Diffusion in Poly(vinyl alcohol) Hydrogels: A Critical First Step to Describe Acid Transport for Encapsulated Bioremediation

02 Sep 2022
Carson J. Silsby
Jonathan R. Counts
Thomas A. Christensen II
Mark F. Roll
Kristopher v. Waynant
James G. Moberly

Bioremediation of chlorinated aliphatic hydrocarbon-contaminated aquifers can be hindered by high contaminant concentrations and acids generated during remediation. Encapsulating microbes in hydrogels may provide a protective, tunable environment from inhibiting compounds; however, current approaches to formulate successful encapsulated systems rely on trial and error rather than engineering approaches because fundamental information on mass-transfer coefficients is lacking. To address this …

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### Measuring Diffusion of Trichlorethylene Breakdown Products in Polyvinylalginate

29 Oct 2018
Thomas A. Christensen II
Samuel R. Wolfe
Jonathan Counts
Mark F. Roll
Kristopher v. Waynant
James G. Moberly

Trichloroethylene (TCE), a toxic and carcinogenic contaminant, presents unique challenges for cleanup because of its water solubility, density, and volatility. Bioremediation of TCE is a promising cleanup method; however, metabolism of TCE results in acid generation that inhibits remediating microorganisms. Calcium alginate(CA)-polyvinylalcohol (PVA) hydrogels show promise for protecting remediating microbes, however diffusion of TCE or its byproducts through these polymers is unknown. To …

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