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Author: Chris L. Brueck Publisher: ISBN: Category : Colloids Languages : en Pages : 65
Book Description
Understanding the mechanisms controlling colloid transport and deposition in the vadose zone is an important step in protecting our water resources. Colloid transport in unsaturated porous media was studied using X-Ray Microtomography (XMT), which is a non-destructive imaging technique that provides three-dimensional images at a resolution on the order of 3 [micro]m/pixel. Under favorable attachment conditions, 5 -15 [micro]m hydrophobic silver coated hollow glass spheres were suspended and drained through sintered glass bead columns at flow rates of 0.5, 5.0 and 50.0 mL/hr. The results show that total colloid deposition was dependent on drainage flow rate and saturation. A positive correlation was found between the total colloid concentration and the number of trapped air bubbles. An image processing algorithm was written to assess the partitioning of colloids to the solid-water interfaces (SWIs), air-water interfaces (AWIs), and air-water-solid (AWS) contact lines, which led to the conclusion that at medium to high water contents, AWIs and AWS contact lines were equally important for colloid attachment and mobilization. Lastly, colloids were shown to be left behind the main drainage front, becoming immobilized in the disconnected wetting phase by attachment to SWIs, or in pendular wetting phase rings.
Author: Chris L. Brueck Publisher: ISBN: Category : Colloids Languages : en Pages : 65
Book Description
Understanding the mechanisms controlling colloid transport and deposition in the vadose zone is an important step in protecting our water resources. Colloid transport in unsaturated porous media was studied using X-Ray Microtomography (XMT), which is a non-destructive imaging technique that provides three-dimensional images at a resolution on the order of 3 [micro]m/pixel. Under favorable attachment conditions, 5 -15 [micro]m hydrophobic silver coated hollow glass spheres were suspended and drained through sintered glass bead columns at flow rates of 0.5, 5.0 and 50.0 mL/hr. The results show that total colloid deposition was dependent on drainage flow rate and saturation. A positive correlation was found between the total colloid concentration and the number of trapped air bubbles. An image processing algorithm was written to assess the partitioning of colloids to the solid-water interfaces (SWIs), air-water interfaces (AWIs), and air-water-solid (AWS) contact lines, which led to the conclusion that at medium to high water contents, AWIs and AWS contact lines were equally important for colloid attachment and mobilization. Lastly, colloids were shown to be left behind the main drainage front, becoming immobilized in the disconnected wetting phase by attachment to SWIs, or in pendular wetting phase rings.
Author: Fritz H. Frimmel Publisher: Springer Science & Business Media ISBN: 3540713395 Category : Science Languages : en Pages : 294
Book Description
This book covers the basics of abiotic colloid characterization, of biocolloids and biofilms, the resulting transport phenomena and their engineering aspects. The contributors comprise an international group of leading specialists devoted to colloidal sciences. The contributions include theoretical considerations, results from model experiments, and field studies. The information provided here will benefit students and scientists interested in the analytical, chemical, microbiological, geological and hydrological aspects of material transport in aquatic systems and soils.
Author: Xinyao Yang Publisher: LAP Lambert Academic Publishing ISBN: 9783847377405 Category : Attenuation (Physics) Languages : en Pages : 244
Book Description
Colloids refer to particles or macromolecules with at least one dimension of 1nm 1m. A wide range of environmental particles fall within this category including microorganisms, nanoparticles, and mineral precipitates. Understanding colloid fate and transport in porous medium not only permits more effective protection of water supplies, but also allows for the development of more effective pollutant remediation strategies. Organic matter (OM) complicates colloid behaviour. To date the influence of OM on colloid mobility in porous media has been largely qualitative. This book presents research leading to the development of multiple-pulse column techniques that may be integrated with mathematical models to quantify the effects of OM on particulate colloid attenuation in saturated porous medium. Research has investigated how two groups of environmental organic compounds, humic acids and proteins, influence particulate colloid attenuation by saturated sand. Study findings may shed light on complex colloidal behaviour in organic matter impacted environment and be useful to professionals in contaminant hydrogeology, environmental remediation, and wastewater treatment.
Author: Chris L. Brueck
Author: Chris L. Brueck
Author: Jun Qi
Author: Fritz H. Frimmel
Author: Heecheul Choi
Author: John T. Crist
Author: Yuniati Zevi
Author: John Matthew Thomas
Author: Maureen A. McGraw
Author: Xinyao Yang
Author: Ann Mathew