Journal article
Coupled Factors Influencing Concentration-Dependent Colloid Transport and Retention in Saturated Porous Media
Environmental science & technology, v 43(18), pp 6996-7002
15 Sep 2009
PMID: 19806733
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The coupled influence of input suspension concentration (C-i), ionic strength (IS), and hydrodynamics on the transport and retention of 1,1 mu m carboxyl-modified latex colloids in saturated quartz sand (150 mu m) under unfavorable attachment conditions (pH 10) was investigated. The percentage of retained colloids in column experiments decreased with C-i at intermediate IS conditions (31 or 56 mM) when colloids were weakly associated with the solid phase by a shallow secondary energy minima. In contrast, the effects of C-i on colloid retention were absent when IS was too low (6 mM) or too high (106 mM). The concentration effects under intermediate IS conditions were dependent on the system hydrodynamics, magnitude of C-i, and injection order of C-i, but they were largely independent of the input colloid mass. These observations were explained in part by time- and concentration-dependent filling of retention sites. Only a small fraction of the solid surface area was found to contribute to retention when IS was 31 mM, and micromodel observations indicated that colloid retention was enhanced in lower velocity regions of the pore space that occurred near grain-grain contacts. Consequently, retention profiles for IS = 31 mM conditions were increasingly nonexponential at lower values of C-i (during filling), whereas the observed concentration effect was largely eliminated as retention locations became filled. In addition, micromodel observations indicated that liquid and solid phase mass transfer of colloids to retention locations was influenced by C-i under intermediate IS conditions. Higher values of C-i are expected to produce less relative mass transfer to retention locations due to increased numbers of collisions that knock weakly associated colloids off the solid phase. Hence, the concentration effects were found to be largely independent of input colloid mass during filling of retention sites.
Metrics
Details
- Title
- Coupled Factors Influencing Concentration-Dependent Colloid Transport and Retention in Saturated Porous Media
- Creators
- Scott A. Bradford - U.S. Salinity LaboratoryHyunjung N. Kim - Univ Calif Riverside, Dept Environm Chem & Engn, Riverside, CA 92521 USABerat Z. Haznedaroglu - U.S. Salinity LaboratorySaeed Torkzaban - U.S. Salinity LaboratorySharon L. Walker - University of California, Riverside
- Publication Details
- Environmental science & technology, v 43(18), pp 6996-7002
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 7
- Grant note
- Cooperative State Research, Education, and Extension Service (CSREES); United States Department of Agriculture (USDA); National Institute of Food and Agriculture Agricultural Research Service (ARS); United States Department of Agriculture (USDA); USDA Agricultural Research Service National Program (NP) 206 United States Department of Agriculture (USDA) 2006-02541 / National Research Initiative (NRI); United States Department of Agriculture (USDA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000269656200021
- Scopus ID
- 2-s2.0-70349161073
- Other Identifier
- 991021229994404721
UN Sustainable Development Goals (SDGs)
This publication has contributed to the advancement of the following goals:
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences