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AuthorHannun, Jamal
AuthorAl-Raoush , Riyadh
Available date2023-08-31T13:19:33Z
Publication Date2023
Publication Name2nd International Conference on Civil Infrastructure and Construction (CIC 2023)
CitationHannun J., Al-Raoush R., "Retention of Hydrophobic Colloids in Unsaturated Porous Media using Microfluidics", The 2nd International Conference on Civil Infrastructure and Construction (CIC 2023), Doha, Qatar, 5-8 February 2023, DOI: https://doi.org/10.29117/cic.2023.0177
ISSN2958-3128
URIhttp://dx.doi.org/10.29117/cic.2023.0177
URIhttp://hdl.handle.net/10576/47130
AbstractWater recharge wells can provide a solution for 3.5 billion people, living in regions suffering from water scarcity. Due to fines migration, freshwater wells that are used to recharge aquifers, often experience expedited deterioration. Colloidal clay fine particles can be mobilized from within aquifers due to hydrodynamic forces or the sweeping of gas-water interface (GWI). The released colloids concentration increases then starts to retain and clog at the pores within the aquifer formation. Although fines migration is responsible for decommissioning many recharge wells, yet there is a lack of pore scale observations that uncover clogging mechanisms within porous media. Thus, this study utilizes wide-field optical macroscopy and microfluidic models with pore morphology of sandstone, to investigate the clogging mechanisms of hydrophobic colloids. The aim is to discover how interfacial surfaces within porous media retain colloids. Hence imbibition and drainage of colloidal suspension were carried to vary water saturation. Flow experiments were imaged at a resolution of 1µm/pixel, while colloids diameter was 5 µm. Images were segmented into solid, water, gas and colloids. Then the amount of colloids retained on each interface was quantified. Findings revealed that hydrophobic colloids retained mainly on the GWI. For colloids suspension in deionized water, affinity of colloids to GWI was high enough to cause bubble stabilization. In both hydrophobic and hydrophilic porous media, colloids disconnected the gas phase to create larger GWI surface. More than 90% of hydrophobic colloids were cleaned from the media after drainage, uncovering an efficient remediation technique for water aquifer.
Languageen
PublisherQatar University Press
SubjectFines clogging
Unsaturated Porous Media
Microfluidic
Hydrophobicity
Colloid retention
TitleRetention of Hydrophobic Colloids in Unsaturated Porous Media using Microfluidics
TypeConference Paper
Pagination1431-1436
ESSN2958-3126
dc.accessType Open Access


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