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Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation
Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation
Diversification of anaerobic digestion into higher value products, namely volatile fatty acids (VFAs), is receiving interest. One of the biggest challenges with this is recovery of the VFAs. Membrane extraction can be used, and a novel process configuration using a non-porous silicone membrane and water for an extractant is proposed here. This process would enable the reduction in the number of downstream unit operations compared to other membrane extraction processes. Selective recovery in favour of longer chain VFAs was demonstrated. Testing with a synthetic solution resulted in an overall mass transfer coefficient of 0.088 μm s-1 for butyric acid, and 0.157 μm s-1 when fermentation broth was used. This indicates this process is not hindered by fouling, but improved somehow. Although the preliminary economic analysis showed this process to require a larger membrane area compared to porous membrane alternatives, it also has a significantly reduced cost associated with the extractant.
0960-8524
400-408
Outram, Victoria
9cce7810-63f2-46ac-bb38-295ccfccc8b4
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Outram, Victoria
9cce7810-63f2-46ac-bb38-295ccfccc8b4
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7

Outram, Victoria and Zhang, Yue (2018) Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation. Bioresource Technology, 270, 400-408. (doi:10.1016/j.biortech.2018.09.057).

Record type: Article

Abstract

Diversification of anaerobic digestion into higher value products, namely volatile fatty acids (VFAs), is receiving interest. One of the biggest challenges with this is recovery of the VFAs. Membrane extraction can be used, and a novel process configuration using a non-porous silicone membrane and water for an extractant is proposed here. This process would enable the reduction in the number of downstream unit operations compared to other membrane extraction processes. Selective recovery in favour of longer chain VFAs was demonstrated. Testing with a synthetic solution resulted in an overall mass transfer coefficient of 0.088 μm s-1 for butyric acid, and 0.157 μm s-1 when fermentation broth was used. This indicates this process is not hindered by fouling, but improved somehow. Although the preliminary economic analysis showed this process to require a larger membrane area compared to porous membrane alternatives, it also has a significantly reduced cost associated with the extractant.

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More information

Accepted/In Press date: 11 September 2018
e-pub ahead of print date: 12 September 2018
Published date: December 2018

Identifiers

Local EPrints ID: 423342
URI: http://eprints.soton.ac.uk/id/eprint/423342
ISSN: 0960-8524
PURE UUID: c829c324-f2c9-488c-82d9-d22513260e97
ORCID for Yue Zhang: ORCID iD orcid.org/0000-0002-5068-2260

Catalogue record

Date deposited: 20 Sep 2018 16:30
Last modified: 07 Oct 2020 05:03

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Contributors

Author: Victoria Outram
Author: Yue Zhang ORCID iD

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