High-Value Organic Acid Recovery from First-Generation Bioethanol Dunder Using Nanofiltration

Cooper, J; Ye, Y; Razmjou, A; Chen, V

High-Value Organic Acid Recovery from First-Generation Bioethanol Dunder Using Nanofiltration

Cooper, J Ye, Y Razmjou, A Chen, V

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Publisher:: AMER CHEMICAL SOC
Publication Type:: Journal Article
Citation:: Industrial and Engineering Chemistry Research, 2020, 59, (26), pp. 11940-11952
Issue Date:: 2020-07-01

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Field	Value	Language
dc.contributor.author	Cooper, J
dc.contributor.author	Ye, Y
dc.contributor.author	Razmjou, A
dc.contributor.author	Chen, V
dc.date.accessioned	2021-02-17T05:41:12Z
dc.date.available	2021-02-17T05:41:12Z
dc.date.issued	2020-07-01
dc.identifier.citation	Industrial and Engineering Chemistry Research, 2020, 59, (26), pp. 11940-11952
dc.identifier.issn	0888-5885
dc.identifier.issn	1520-5045
dc.identifier.uri	http://hdl.handle.net/10453/146175
dc.description.abstract	Copyright © 2020 American Chemical Society. Nanofiltration (NF) was investigated for the recovery of platform chemicals, specifically, succinic acid, from high-strength bioethanol waste (dunder). Conventional methods focusing on chemical precipitation entail poor selectivity in complex matrices and are inherently expensive owing to the consumption of large volumes of chemicals and the generation of excess by-product sludge. For these reasons, three commercially available NF membranes with varying molecular weight cut-off were screened in a dead-end configuration to benchmark transmission behavior at different solution chemistries including pH, feed pressure, concentration, and ionic strength prior to filtration with the industrial effluent. Examination of behavior with model solutions only reveals that both NF270 and NTR-7450 membranes exhibit a succinic acid permeation above 80% irrespective of pH and solute concentration, while the addition of inorganic salts, in particular, divalent species, lowered the transmission of succinic acid with all membranes, in particular, NF90. Measurements of the surface charge (zeta potential) before and after filtration of the industrial effluent indicate a shift toward more positive values for the polyamide membranes (NF90 and NF270) within the pH range of 2-10. This change in surface charge was attributed to the formation of complexes between humic compounds and divalent cations present in elevated concentrations. Considerable fouling was observed for all membranes with the mean permeate flux around 2 L/m2h at 5 bar for the NF270 and NTR-7450 membranes; however, findings from deionized water rinsing suggest that the majority of foulants reside within the reversible fouling layer. Finally, size exclusion chromatography (liquid chromatography-organic carbon detection) findings highlight substantial (>70%) rejection of biopolymers, humics, building blocks, and low-molecular-weight neutral species following filtration with all membranes. Overall, this work demonstrates the merits and potential of nanofiltration in the recovery of high-value organic acids from concentrated bioethanol waste.
dc.language	English
dc.publisher	AMER CHEMICAL SOC
dc.relation.ispartof	Industrial and Engineering Chemistry Research
dc.relation.isbasedon	10.1021/acs.iecr.9b06877
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.subject.classification	Chemical Engineering
dc.title	High-Value Organic Acid Recovery from First-Generation Bioethanol Dunder Using Nanofiltration
dc.type	Journal Article
utslib.citation.volume	59
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-17T05:41:08Z
pubs.issue	26
pubs.publication-status	Published
pubs.volume	59
utslib.citation.issue	26

Abstract:

Copyright © 2020 American Chemical Society. Nanofiltration (NF) was investigated for the recovery of platform chemicals, specifically, succinic acid, from high-strength bioethanol waste (dunder). Conventional methods focusing on chemical precipitation entail poor selectivity in complex matrices and are inherently expensive owing to the consumption of large volumes of chemicals and the generation of excess by-product sludge. For these reasons, three commercially available NF membranes with varying molecular weight cut-off were screened in a dead-end configuration to benchmark transmission behavior at different solution chemistries including pH, feed pressure, concentration, and ionic strength prior to filtration with the industrial effluent. Examination of behavior with model solutions only reveals that both NF270 and NTR-7450 membranes exhibit a succinic acid permeation above 80% irrespective of pH and solute concentration, while the addition of inorganic salts, in particular, divalent species, lowered the transmission of succinic acid with all membranes, in particular, NF90. Measurements of the surface charge (zeta potential) before and after filtration of the industrial effluent indicate a shift toward more positive values for the polyamide membranes (NF90 and NF270) within the pH range of 2-10. This change in surface charge was attributed to the formation of complexes between humic compounds and divalent cations present in elevated concentrations. Considerable fouling was observed for all membranes with the mean permeate flux around 2 L/m2h at 5 bar for the NF270 and NTR-7450 membranes; however, findings from deionized water rinsing suggest that the majority of foulants reside within the reversible fouling layer. Finally, size exclusion chromatography (liquid chromatography-organic carbon detection) findings highlight substantial (>70%) rejection of biopolymers, humics, building blocks, and low-molecular-weight neutral species following filtration with all membranes. Overall, this work demonstrates the merits and potential of nanofiltration in the recovery of high-value organic acids from concentrated bioethanol waste.

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