Erosion of Colloids Coated With Humic Substances in Fixed and Fluidized Beds
Sturm, Terry W.
Dennett, Keith E.
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Migration of various pollutants associated with colloidal particles has been reported by several researchers. Detachment of colloids and their associated pollutants could be controlled by hydrodynamic as well as chemical conditions of the eroding water. The objective of this study is to understand the mechanisms of detachment of uncoated colloids and colloids coated with humic substances from relatively coarse media grains. Under fixed-bed conditions, the percent detachment was found to increase with an increase in pore velocity. Increased organic coatings caused percent detachment to decrease under fluidized bed conditions. The results of this study will be useful for modifications to soil erosion models for cohesive sediments and estimation of transport of contaminants carried by colloids during dredging operations.