Mobile Subsurface Colloids and Their Role in Contaminant Transport

Kretzschmar, Ruben; Borkovec, Michal; Grolimund, Daniel; Elimelech, Menachem

doi:10.1016/s0065-2113(08)60427-7

Cited by 600 publications

(479 citation statements)

References 238 publications

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“…As a result, virus-particle aggregates would be easier to remove by filtration [61,62]. Experiments presented here were conducted as a worst case scenario for monodispersed viruses.…”

Section: Chapter 4 Discussionmentioning

confidence: 99%

Iron oxide amended biosand filters for virus removal

et al. 2011

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Laboratory studies were performed to determine if the addition of iron oxides throughout biosand filter (BSF) media would increase virus removal due to adsorption.The proposed mechanism is electrostatic adsorption of negatively charged virion particles to positively charged iron oxides formed during the corrosion of zerovalent iron. Initial tests conducted using continuous flow, small-scale glass columns showed high MS2 bacteriophage removal in an iron-amended sand column (5-log 10 ) compared to a sand only column (0.5-log 10 ) over 20 pore volumes. Additionally, two experiments with a column containing iron particles revealed 4 and 5 log 10 removal of rotavirus in the presence of 20 mg/L total organic carbon. Full-scale BSFs with iron particles removed >4-log 10 MS2 for the duration of the experiment (287 days), while BSF with steel wool removed >4-log 10 MS2 for the first 160 days. Plug flow for the BSF was shown to depend on uniformity between the iron oxide material and sand media grains. The results suggest that the duration of effective virus removal by iron-amended biosand filtration depends on source water conditions and the quantity and composition of iron material added. Overall, this study provides evidence that iron-amended BSFs may advance the field of point-of-use technologies and bring relief to millions of people suffering from waterborne diseases.iii ACKNOWLEDGMENTS

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“…As a result, virus-particle aggregates would be easier to remove by filtration [61,62]. Experiments presented here were conducted as a worst case scenario for monodispersed viruses.…”

Section: Chapter 4 Discussionmentioning

confidence: 99%

Iron oxide amended biosand filters for virus removal

et al. 2011

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“…This enhanced adsorption could be caused by ternary surface complexation, electrostatic attraction, or even surface precipitation of the trace-metal-siderophore complexes. Thus, as often noted in the literature, the presence of organic ligands can lead either to enhanced metal transport or enhanced adsorption (26)(27)(28)(29)(30)(31). If the formation of soluble complexes competes effectively with metal sorption by a soil matrix, the mobility of metal ions increases, but secondary adsorption of the metal complex reduces metal ion mobility (27,28).…”

Section: Introductionmentioning

confidence: 88%

Adsorption of Pb(II) and Eu(III) by Oxide Minerals in the Presence of Natural and Synthetic Hydroxamate Siderophores

Kraemer

Raymond

et al. 2002

Environ. Sci. Technol.

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Trihydroxamate siderophores have been proposed for use as mediators of actinide and heavy metal mobility in contaminated subsurface zones. These microbially produced ligands, common in terrestrial and marine environments, recently have been derivatized synthetically to enhance their affinity for transuranic metal cations. However, the interactions between these synthetic derivative and adsorbed trace metals have not been characterized. In this paper we compare a natural siderophore, desferrioxamine-B (DFO-B), with its actinide-specific catecholate derivative, N-(2,3-dihydroxy-4-(methylamido)benzoyl)-desferrioxamine-B (DFOMTA), as to their effect on the adsorption of Pb(II) and Eu(III) by goethite and boehmite. In the presence of 240 µM DFO-B, a strongly depleting effect on Eu(III) adsorption by goethite and boehmite occurred above pH 6. By contrast, almost total removal of Eu(III) from solution in the neutral to slightly acidic pH range was observed in the presence of either 10 or 100 µM DFOMTA, due primarily to the formation of metal-DFOMTA precipitates. Addition of DFOMTA caused an increase in Pb(II) adsorption by goethite below pH 5, but a decrease above pH 5, such that the Pb(II) adsorption edge in the presence of DFOMTA strongly resembled the DFOMTA adsorption envelope, which showed a maximum near pH 5 and decreasing adsorption toward lower and higher pH.

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“…Briefly, two types of suspensions: nTiO2 only and nTiO2+ HA were prepared by suspending 10 mg nTiO2 suspension into 1 mM background NaCl solutions with various concentrations of HA (0, 0.13, 0.33, 0.66 mg/L) at pH 5 and 9 respectively in 500 mL glass beakers. (Table A1) The overall interactive forces (i.e., van der Waals forces, electric double layer forces, hydration forces, and steric repulsion) between nanoparticles and media grains domain the nanoparticle deposition (Kretzschmar et al, 1999), and thus influencing nanoparticle transport in porous media. pH influenced nTiO2 deposition and transport by affecting surface charge of nTiO2 and media grains.…”

Section: Conclusion and Environmental Implicationsmentioning

confidence: 99%

Stability of nTiO 2 particles and their attachment to sand: Effects of humic acid at different pH

Cheng

2016

Science of The Total Environment

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Influence of humic acid (HA) on stability and attachment of nTiO2 particles to sand was investigated. Results showed that HA can either promote or hinder nTiO2 stability, depending on pH and HA concentration. HA can either enhance or reduce nTiO2 attachment to Fe oxyhydroxide coating at pH 5, depending on HA concentration.Results further showed that at pH 5, Fe oxyhydroxide coating reduced nTiO2 attachment to sand in the absence of HA but increased nTiO2 attachment in the presence of low concentration of HA. Derjaguin-Landau-Verwey-Overbeek (DLVO) theory was invoked to analyze particle-to-particle and particle-to-sand interactions in order to elucidate the roles of pH, HA, quartz, and Fe coating in controlling nTiO2 stability and attachment. Overall, this study showed that changes in zeta potential of nTiO2 and Fe coating due to pH changes and/or HA adsorption are the key factors that influence stability and attachment of nTiO2.iii ACKNOWLEDGEMENTS

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Mobile Subsurface Colloids and Their Role in Contaminant Transport

Cited by 600 publications

References 238 publications

Iron oxide amended biosand filters for virus removal

Iron oxide amended biosand filters for virus removal

Adsorption of Pb(II) and Eu(III) by Oxide Minerals in the Presence of Natural and Synthetic Hydroxamate Siderophores

Stability of nTiO 2 particles and their attachment to sand: Effects of humic acid at different pH

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