Forces Governing the Transport of Pathogenic and Nonpathogenic Escherichia coli in Nitrogen and Magnesium Doped Biochar Amended Sand Columns

dc.contributor.authorQuinn, Katherine
dc.contributor.authorMood, Sohrab Haghighi
dc.contributor.authorCervantes, Elizabeth
dc.contributor.authorPerez, Manuel Garcia
dc.contributor.authorAbu-Lail, Nehal I.
dc.date.accessioned2023-03-28T12:56:00Z
dc.date.available2023-03-28T12:56:00Z
dc.date.issued2023-02-07
dc.date.updated2023-03-28T12:56:02Z
dc.description.abstractBackground: Access to safe drinking water remains a global issue with fecal indicator bacteria being major pollutants. Biochars offer low-cost adsorbents for bacterial pathogens. A fundamental understanding of how biochars interact with bacterial pathogens is essential to designing effective biofilters. Methods: Water-saturated sand columns amended with Magnesium and Nitrogen-doped biochars produced by pyrolysis at 400, 500, 600, and 700 ◦C were used to Quantify the transport of pathogenic Escherichia coli O157:H7 and nonpathogenic E. coli k12 strains in porous media. Measured data were modeled using DLVO theory of colloidal stability. were explored. Results: (1) Biochar is hydrophobic while sand and bacteria are hydrophilic; (2) all Gibbs free energy values quantified between E. coli O157:H7 and biochar were negative except for biochar produced at 700 ◦C; (3) all types of forces investigated (van der Waals, electrostatic, and acid-base interactions) played a role in governing the interactions between bacteria and biochar. Conclusions: (1) Adding doped biochar to sand at a 2% weight ratio enhanced the retention of bacterial cells in the sand/biochar columns; (2) bacterial transport is strain-dependent and mediated by various types of forces resulting from interactions between the various functional groups displayed on bacteria and biochar/sand. Our findings emphasize the importance of monitoring biochar’s functionality to eliminate bacterial pollutants from contaminated water.
dc.description.departmentBiomedical Engineering and Chemical Engineering
dc.description.departmentChemistry
dc.identifierdoi: 10.3390/microbiolres14010018
dc.identifier.citationMicrobiology Research 14 (1): 218-228 (2023)
dc.identifier.urihttps://hdl.handle.net/20.500.12588/1798
dc.rightsAttribution 4.0 United States
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectbiochar
dc.subjectDLVO
dc.subjectE. coli
dc.subjectGibbs free energy
dc.subjecthydrophobicity
dc.subjectsurface potential
dc.titleForces Governing the Transport of Pathogenic and Nonpathogenic Escherichia coli in Nitrogen and Magnesium Doped Biochar Amended Sand Columns
dc.typeArticle

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