Journal
LANGMUIR
Volume 25, Issue 3, Pages 1594-1605Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la803202h
Keywords
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Funding
- WaterCAMPWS
- Center of Advanced Materials for the Purification of Water with Systems under the National Science Foundation [CTS-0120978]
- Department of Civil and Environmental Engineering
- University of Illinois
- Royal Thai Government Fellowship
- USDA [2008-35102-19143]
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A radial stagnation point flow (RSPF) system combined with a microscope was used to determine the deposition kinetics of Cryptosporidium parvum oocysts on quartz surfaces and silica surfaces coated with Suwannee River natural organic matter (SRNOM) in solutions with different ionic strengths. Microscopic evidence of C. parvum oocysts entrapped in the secondary minimum energy well was presented to show that among the entrapped C. parvum oocysts some were washed away by the radial flow and some were able to transfer to deep primary minima and become irreversibly deposited. Experimental data were compared with simulation results obtained by the convective-diffusion equation and Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The experimental results suggested that surface charge heterogeneity led to a higher attachment efficiency at low ionic strength. In addition, the maximum attachment efficiency was less than I at high ionic strength due to steric interaction.
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