Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1021/acs.est.8b03648
Document author version
Title (Primary) Electric field effects on bacterial deposition and transport in porous media
Author Shan, Y.; Harms, H.; Wick, L.Y.
Source Titel Environmental Science & Technology
Year 2018
Department UMB
Volume 52
Issue 24
Page From 14294
Page To 14301
Language englisch
Abstract Bacterial deposition and transport are key to microbial ecology and biotechnological applications. We therefore tested whether electrokinetic forces (electroosmotic shear force (FEOF), electrophoretic drag force (FEP)) acting on bacteria may be used to control bacterial deposition during transport in laboratory percolation columns exposed to external direct current (DC) electric fields. For different bacteria, yet similar experimental conditions we observed that DC fields either enhanced or reduced bacterial deposition efficiencies (α) relative to DC-free controls. By calculating the DLVO force of colloidal interactions, FEOF, FEP, and the hydraulic shear forces acting on single cells at a collector surface we found that DC-induced changes of α correlated to |FEOF| to |FEP| ratios: If |FEOF| > |FEP|, α was clearly increased and if |FEOF| < |FEP| α was clearly decreased. Our findings allow for better prediction of the forces acting on a bacterium at collector surface and, hence, the electrokinetic control of microbial deposition in natural and manmade ecosystems.
Persistent UFZ Identifier
Shan, Y., Harms, H., Wick, L.Y. (2018):
Electric field effects on bacterial deposition and transport in porous media
Environ. Sci. Technol. 52 (24), 14294 - 14301 10.1021/acs.est.8b03648