Transport behaviors of biochar particles in saturated porous media under DC electric field.

Liu, Y; Zhang, X; Xu, Y; Liu, Q; Ngo, HH; Cao, W

Transport behaviors of biochar particles in saturated porous media under DC electric field.

Liu, Y Zhang, X Xu, Y Liu, Q Ngo, HH Cao, W

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Sci Total Environ, 2023, 856, (Pt 2), pp. 159084
Issue Date:: 2023-01-15

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Field	Value	Language
dc.contributor.author	Liu, Y
dc.contributor.author	Zhang, X
dc.contributor.author	Xu, Y
dc.contributor.author	Liu, Q
dc.contributor.author	Ngo, HH
dc.contributor.author	Cao, W
dc.date.accessioned	2023-04-12T06:15:11Z
dc.date.available	2022-09-23
dc.date.available	2023-04-12T06:15:11Z
dc.date.issued	2023-01-15
dc.identifier.citation	Sci Total Environ, 2023, 856, (Pt 2), pp. 159084
dc.identifier.issn	0048-9697
dc.identifier.issn	1879-1026
dc.identifier.uri	http://hdl.handle.net/10453/169645
dc.description.abstract	The mobility of biochar in saturated quartz sand under a direct current (DC) electric field was investigated by column transport test. The effects of biochar preparation temperature (350 and 550 °C), solution chemistry (pH of 4, 7, and 10, and ion strength of 1, 10, 100 mM) and voltage gradient (0, 0.5 and 1.0 V cm-1) on the mobility of biochar were explored. It was found that DC electric field could significantly promote the migration of biochar, and the recovery rate of particles could be improved by 0.5-6.1 folds under 0.5 V cm-1. Higher voltage potential, solution pH and ionic strength were more favorable for biochar migration. The transport of biochar could be well interpreted by deterministic nonequilibrium convection-dispersion equation model. The enhanced mobility caused by DC electric field was attributed to the following reasons: enhanced electromigration following electrostatic attraction from the anode; increasing surface negative charges and functional groups on biochar surface as a result of electrochemical oxidization; reducing size blocking of biochar particles by decreasing particle size. Moreover, the interaction between biochar particles and electrode could alter solution chemistry, in particular, increasing solution pH, which in turn facilitated the transport of biochar. This study provided a perspective to modulate the transport behavior of biochar particle in the soil for the remediation of polluted sites.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	Elsevier
dc.relation.ispartof	Sci Total Environ
dc.relation.isbasedon	10.1016/j.scitotenv.2022.159084
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Environmental Sciences
dc.subject.mesh	Porosity
dc.subject.mesh	Charcoal
dc.subject.mesh	Soil
dc.subject.mesh	Particle Size
dc.subject.mesh	Solutions
dc.subject.mesh	Charcoal
dc.subject.mesh	Soil
dc.subject.mesh	Solutions
dc.subject.mesh	Particle Size
dc.subject.mesh	Porosity
dc.subject.mesh	Porosity
dc.subject.mesh	Charcoal
dc.subject.mesh	Soil
dc.subject.mesh	Particle Size
dc.subject.mesh	Solutions
dc.title	Transport behaviors of biochar particles in saturated porous media under DC electric field.
dc.type	Journal Article
utslib.citation.volume	856
utslib.location.activity	Netherlands
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/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
dc.date.updated	2023-04-12T06:15:10Z
pubs.issue	Pt 2
pubs.publication-status	Published
pubs.volume	856
utslib.citation.issue	Pt 2

Abstract:

The mobility of biochar in saturated quartz sand under a direct current (DC) electric field was investigated by column transport test. The effects of biochar preparation temperature (350 and 550 °C), solution chemistry (pH of 4, 7, and 10, and ion strength of 1, 10, 100 mM) and voltage gradient (0, 0.5 and 1.0 V cm-1) on the mobility of biochar were explored. It was found that DC electric field could significantly promote the migration of biochar, and the recovery rate of particles could be improved by 0.5-6.1 folds under 0.5 V cm-1. Higher voltage potential, solution pH and ionic strength were more favorable for biochar migration. The transport of biochar could be well interpreted by deterministic nonequilibrium convection-dispersion equation model. The enhanced mobility caused by DC electric field was attributed to the following reasons: enhanced electromigration following electrostatic attraction from the anode; increasing surface negative charges and functional groups on biochar surface as a result of electrochemical oxidization; reducing size blocking of biochar particles by decreasing particle size. Moreover, the interaction between biochar particles and electrode could alter solution chemistry, in particular, increasing solution pH, which in turn facilitated the transport of biochar. This study provided a perspective to modulate the transport behavior of biochar particle in the soil for the remediation of polluted sites.

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http://hdl.handle.net/10453/169645