Factors governing microalgae harvesting efficiency by flocculation using cationic polymers.

Vu, HP; Nguyen, LN; Emmerton, B; Wang, Q; Ralph, PJ; Nghiem, LD

Factors governing microalgae harvesting efficiency by flocculation using cationic polymers.

Vu, HP Nguyen, LN Emmerton, B Wang, Q

Ralph, PJ Nghiem, LD

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Bioresource technology, 2021, 340, pp. 125669
Issue Date:: 2021-07-27

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Field	Value	Language
dc.contributor.author	Vu, HP
dc.contributor.author	Nguyen, LN
dc.contributor.author	Emmerton, B
dc.contributor.author	Wang, Q https://orcid.org/0000-0002-5744-2331
dc.contributor.author	Ralph, PJ
dc.contributor.author	Nghiem, LD
dc.date.accessioned	2021-11-16T22:48:36Z
dc.date.available	2021-07-24
dc.date.available	2021-11-16T22:48:36Z
dc.date.issued	2021-07-27
dc.identifier.citation	Bioresource technology, 2021, 340, pp. 125669
dc.identifier.issn	0960-8524
dc.identifier.issn	1873-2976
dc.identifier.uri	http://hdl.handle.net/10453/151648
dc.description.abstract	This study aims to elucidate the mechanisms governing the harvesting efficiency of Chlorella vulgaris by flocculation using a cationic polymer. Flocculation efficiency increased as microalgae culture matured (i.e. 35-45, 75, and > 97% efficiency at early, late exponential, and stationary phase, respectively. Unlike the negative impact of phosphate on flocculation in traditional wastewater treatment; here, phosphorous residue did not influence the flocculation efficiency of C. vulgaris. The observed dependency of flocculation efficiency on growth phase was driven by changes in microalgal cell properties. Microalgal extracellular polymeric substances (EPS) in both bound and free forms at stationary phase were two and three times higher than those at late and early exponential phase, respectively. Microalgae cells also became more negatively charged as they matured. Negatively charged and high EPS content together with the addition of high molecular weight and positively charged polymer could facilitate effective flocculation via charge neutralisation and bridging.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier BV
dc.relation.ispartof	Bioresource technology
dc.relation.isbasedon	10.1016/j.biortech.2021.125669
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject.classification	Biotechnology
dc.subject.mesh	Biomass
dc.subject.mesh	Chlorella vulgaris
dc.subject.mesh	Flocculation
dc.subject.mesh	Microalgae
dc.subject.mesh	Polymers
dc.title	Factors governing microalgae harvesting efficiency by flocculation using cationic polymers.
dc.type	Journal Article
utslib.citation.volume	340
utslib.location.activity	England
pubs.organisational-group	/University of Technology Sydney
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/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2023-11-30T00:00:00+1000Z
dc.date.updated	2021-11-16T22:48:35Z
pubs.publication-status	Published
pubs.volume	340

Abstract:

This study aims to elucidate the mechanisms governing the harvesting efficiency of Chlorella vulgaris by flocculation using a cationic polymer. Flocculation efficiency increased as microalgae culture matured (i.e. 35-45, 75, and > 97% efficiency at early, late exponential, and stationary phase, respectively. Unlike the negative impact of phosphate on flocculation in traditional wastewater treatment; here, phosphorous residue did not influence the flocculation efficiency of C. vulgaris. The observed dependency of flocculation efficiency on growth phase was driven by changes in microalgal cell properties. Microalgal extracellular polymeric substances (EPS) in both bound and free forms at stationary phase were two and three times higher than those at late and early exponential phase, respectively. Microalgae cells also became more negatively charged as they matured. Negatively charged and high EPS content together with the addition of high molecular weight and positively charged polymer could facilitate effective flocculation via charge neutralisation and bridging.

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http://hdl.handle.net/10453/151648