Transport of gellan gum microbeads through sand : An experimental evaluation for encapsulated cell bioaugmentation

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DOIResolve DOI: http://doi.org/10.1016/j.jenvman.2003.09.003
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TypeArticle
Journal titleJournal of Environmental Management
ISSN03014797
Volume69
Issue3
Pages249259; # of pages: 11
Subjectenv; gellan gum; encapsulation; emulsification; microbead; transport; sand column; bacteria; biodegradation, environmental; culture media; polysaccharides, bacterial; silicon dioxide; soil pollutants; water movements; water pollutants
AbstractTransport of 10-40 µm gellan gum microbeads was studied in horizontal sand columns to evaluate the feasibility of using gel-encapsulated bacteria for bioaugmentation of contaminated aquifers. Three 5.2 x 110 cm columns were packed with sand (column A: 0.5-2 mm, column B: 0.25-2 mm, and column C: 0.125-2 mm). Microbeads in artificial groundwater were injected at 0.5 l h(-1) during intermittent 12-h periods. Breakthrough of microbeads increased with injection time, varying as a descending function of travel distance. After 72 h of injection, about 75% of injected microbeads were dispersed across a 5-110 cm distance from the inlet in column A, compared to 78% across a 5-50 cm in column B, and 76% across a 5-20 cm in column C. The wider dispersion of microbeads across the length of column A, compared to those observed in columns B and C, suggests a higher potential for the formation of a uniform bioactive zone of encapsulated cells across a sandy aquifer with such grain size distribution and hydrodynamic properties.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
Identifier10015541
NRC number45929
NPARC number3539418
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Record identifier4f5b902c-a197-4623-9207-fbd1d584782d
Record created2009-03-01
Record modified2016-05-09
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