42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
|
---
|
|||
|
|
title: "Measuring Diffusion of Trichlorethylene Breakdown Products in Polyvinylalginate"
|
|||
|
|
date: 2018-10-29
|
|||
|
|
cardImage: library
|
|||
|
|
draft: false
|
|||
|
|
featured: false
|
|||
|
|
keywords:
|
|||
|
|
- bioremediation
|
|||
|
|
- polyoxometalate
|
|||
|
|
- hydrogel polymers
|
|||
|
|
- proton transport
|
|||
|
|
- chemical engineering
|
|||
|
|
type: "Poster"
|
|||
|
|
authors:
|
|||
|
|
- Thomas A. Christensen II
|
|||
|
|
- Samuel R. Wolfe
|
|||
|
|
- Jonathan Counts
|
|||
|
|
- Mark F. Roll
|
|||
|
|
- Kristopher V. Waynant
|
|||
|
|
- James G. Moberly
|
|||
|
|
journal: "AIChE Annual Meeting"
|
|||
|
|
location: "Pittsburgh, Pennsylvania"
|
|||
|
|
awards:
|
|||
|
|
- '3rd Place Environmental III Division Undergraduate Poster Competition'
|
|||
|
|
---
|
|||
|
|
|
|||
|
|
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 measure the effective diffusion coefficient of TCE and
|
|||
|
|
byproducts through hydrogel membranes, we used a modified diaphragm cell.
|
|||
|
|
Measured effective diffusion coefficient of each species was (cm {{< sup 2 >}}/s
|
|||
|
|
× 10{{< sup 6 >}}): 14.0 ± 1.91 for H{{< sup "+" >}} ions, 12.4 ± 1.64 for TCE,
|
|||
|
|
7.83 ± 0.54 for cis-1,2-dichloroethylene (DCE), and 4.68 ± 4.14 for vinyl
|
|||
|
|
chloride. These results aid in engineering biobeads and suggest that CA-PVA
|
|||
|
|
hydrogel blends are effective in slowing diffusion of protons, buffering acids
|
|||
|
|
produced by trichloroethylene metabolism, and remains suitable for encapsulation
|
|||
|
|
of microorganisms involved in bioremediation.
|