Scott A Bradford

Summary

Affiliation: Agricultural Research Service
Country: USA

Publications

  1. doi request reprint A theoretical analysis of colloid attachment and straining in chemically heterogeneous porous media
    Scott A Bradford
    US Salinity Laboratory, USDA, ARS, Riverside, California 92507, United States
    Langmuir 29:6944-52. 2013
  2. doi request reprint Colloid interaction energies for physically and chemically heterogeneous porous media
    Scott A Bradford
    US Salinity Laboratory, USDA, ARS, Riverside, California 92507, USA
    Langmuir 29:3668-76. 2013
  3. ncbi request reprint Causes and implications of colloid and microorganism retention hysteresis
    Scott A Bradford
    US Salinity Laboratory, USDA, ARS, Riverside, CA, USA
    J Contam Hydrol 138:83-92. 2012
  4. ncbi request reprint Colloid adhesive parameters for chemically heterogeneous porous media
    Scott A Bradford
    U S Salinity Laboratory, USDA, ARS, Riverside, California, USA
    Langmuir 28:13643-51. 2012
  5. ncbi request reprint Implications of cation exchange on clay release and colloid-facilitated transport in porous media
    Scott A Bradford
    USDA ARS, U S Salinity Lab, 450 W Big Springs Rd, Riverside, CA 92507, USA
    J Environ Qual 39:2040-6. 2010
  6. ncbi request reprint Coupled factors influencing concentration-dependent colloid transport and retention in saturated porous media
    Scott A Bradford
    United States Department of Agriculture, Agricultural Research Service, United States Salinity Laboratory, Riverside, CA 92507, USA
    Environ Sci Technol 43:6996-7002. 2009
  7. doi request reprint Fate of indicator microorganisms under nutrient management plan conditions
    Scott A Bradford
    USDA ARS, U S Salinity Lab, Riverside, CA 92507, USA
    J Environ Qual 38:1728-38. 2009
  8. ncbi request reprint Coupling of physical and chemical mechanisms of colloid straining in saturated porous media
    Scott A Bradford
    US Salinity Laboratory, USDA ARS, 450 W Big Springs Road, Riverside, CA 92507 4617, USA
    Water Res 41:3012-24. 2007
  9. ncbi request reprint Colloid transport in unsaturated porous media: the role of water content and ionic strength on particle straining
    Saeed Torkzaban
    Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
    J Contam Hydrol 96:113-27. 2008
  10. doi request reprint Hysteresis of colloid retention and release in saturated porous media during transients in solution chemistry
    Saeed Torkzaban
    Earth Sciences Division, Lawrence, Berkeley National Laboratory, Berkeley, CA, USA
    Environ Sci Technol 44:1662-9. 2010

Detail Information

Publications25

  1. doi request reprint A theoretical analysis of colloid attachment and straining in chemically heterogeneous porous media
    Scott A Bradford
    US Salinity Laboratory, USDA, ARS, Riverside, California 92507, United States
    Langmuir 29:6944-52. 2013
    ..Conversely, straining was dominant for the opposite conditions. Discrepancies in the literature on mechanisms of colloid retention are likely due to a lack of consideration of all of these factors...
  2. doi request reprint Colloid interaction energies for physically and chemically heterogeneous porous media
    Scott A Bradford
    US Salinity Laboratory, USDA, ARS, Riverside, California 92507, USA
    Langmuir 29:3668-76. 2013
    ..The variance in Φ* tended to be higher for a chemically heterogeneous solid...
  3. ncbi request reprint Causes and implications of colloid and microorganism retention hysteresis
    Scott A Bradford
    US Salinity Laboratory, USDA, ARS, Riverside, CA, USA
    J Contam Hydrol 138:83-92. 2012
    ..Retention and release behavior of CML colloids on salt+acid treated sand was much more consistent with mean interaction energies due to reduction in microscopic heterogeneities...
  4. ncbi request reprint Colloid adhesive parameters for chemically heterogeneous porous media
    Scott A Bradford
    U S Salinity Laboratory, USDA, ARS, Riverside, California, USA
    Langmuir 28:13643-51. 2012
    ..Our model results show that the PDFs of colloid adhesive parameters at the REA scale were sensitive to the size of the colloid and the heterogeneity, the charge and number of grid cells, and the ionic strength...
  5. ncbi request reprint Implications of cation exchange on clay release and colloid-facilitated transport in porous media
    Scott A Bradford
    USDA ARS, U S Salinity Lab, 450 W Big Springs Rd, Riverside, CA 92507, USA
    J Environ Qual 39:2040-6. 2010
    ..The transport of Cu2+ was then shown to be dramatically enhanced by an order of magnitude in peak concentration by adsorption on clays that were released following cation exchange and IS reduction...
  6. ncbi request reprint Coupled factors influencing concentration-dependent colloid transport and retention in saturated porous media
    Scott A Bradford
    United States Department of Agriculture, Agricultural Research Service, United States Salinity Laboratory, Riverside, CA 92507, USA
    Environ Sci Technol 43:6996-7002. 2009
    ..Hence, the concentration effects were found to be largely independent of input colloid mass during filling of retention sites...
  7. doi request reprint Fate of indicator microorganisms under nutrient management plan conditions
    Scott A Bradford
    USDA ARS, U S Salinity Lab, Riverside, CA 92507, USA
    J Environ Qual 38:1728-38. 2009
    ..All of these observations support the hypothesis that a NMP at this site will protect groundwater supplies from microorganism contamination, especially when applied water and wastewater meet ET...
  8. ncbi request reprint Coupling of physical and chemical mechanisms of colloid straining in saturated porous media
    Scott A Bradford
    US Salinity Laboratory, USDA ARS, 450 W Big Springs Road, Riverside, CA 92507 4617, USA
    Water Res 41:3012-24. 2007
    ..These observations suggest that the extent of colloid removal by straining is strongly coupled to solution chemistry...
  9. ncbi request reprint Colloid transport in unsaturated porous media: the role of water content and ionic strength on particle straining
    Saeed Torkzaban
    Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
    J Contam Hydrol 96:113-27. 2008
    ..These weakly associated colloids are prone to be translated to stagnation regions formed at grain-grain junctions, the solid-water-air triple point, and dead-end pores and then becoming trapped...
  10. doi request reprint Hysteresis of colloid retention and release in saturated porous media during transients in solution chemistry
    Saeed Torkzaban
    Earth Sciences Division, Lawrence, Berkeley National Laboratory, Berkeley, CA, USA
    Environ Sci Technol 44:1662-9. 2010
    ....
  11. ncbi request reprint Escherichia coil O157:H7 transport in saturated porous media: role of solution chemistry and surface macromolecules
    Hyunjung N Kim
    Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, USA
    Environ Sci Technol 43:4340-7. 2009
    ..The findings in this study also imply that previous work conducted at lower pH and IS conditions may underestimate E. coli O157:H7 travel distance in higher salt and pH groundwater environments...
  12. doi request reprint Macromolecule mediated transport and retention of Escherichia coli O157:H7 in saturated porous media
    Hyunjung N Kim
    Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
    Water Res 44:1082-93. 2010
    ..These observations indicated that the presence of macromolecules hindered irreversible interactions between the cells and the quartz surface...
  13. ncbi request reprint Resolving the coupled effects of hydrodynamics and DLVO forces on colloid attachment in porous media
    Saeed Torkzaban
    Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, California 92521, USA
    Langmuir 23:9652-60. 2007
    ..Simulations demonstrated that quantitative evaluation of colloid transport through porous media will require nontraditional approaches that account for hydrodynamic and DLVO forces as well as collector shape and size...
  14. doi request reprint Coupled factors influencing the transport and retention of Cryptosporidium parvum oocysts in saturated porous media
    Hyunjung N Kim
    Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, USA
    Water Res 44:1213-23. 2010
    ..Comparison of experimental observations and theoretical predictions from classic filtration theory further supported the presence of this weak interaction due to steric repulsion...
  15. ncbi request reprint Concentration dependent transport of colloids in saturated porous media
    Scott A Bradford
    George E Brown, Jr, Salinity Laboratory, USDA, ARS, 450 W Big Springs Road, Riverside CA 92507 4617, USA
    J Contam Hydrol 82:99-117. 2006
    ..Simulations that included straining, liberation, attachment, and detachment significantly improved the description of the experimental data...
  16. ncbi request reprint Analysis of steroid hormones in a typical dairy waste disposal system
    Wei Zheng
    Department of Environmental Sciences, University of California, Riverside, California 92521, USA
    Environ Sci Technol 42:530-5. 2008
    ....
  17. ncbi request reprint Transport of coliphage in the presence and absence of manure suspension
    Scott A Bradford
    USDA ARS, George E Brown, Jr, Salinity Laboratory, 450 W Big Springs Road, Riverside CA 92507 4617, USA
    J Environ Qual 35:1692-701. 2006
    ....
  18. doi request reprint Combined physical and chemical nonequilibrium transport model: analytical solution, moments, and application to colloids
    Feike J Leij
    Dept of Civil Engineering and Construction Engineering Management, California State University, Long Beach, CA, USA
    J Contam Hydrol 110:87-99. 2009
    ..A considerably better description was provide by the simple CNE model but the best description, especially for the larger 3.2-microm colloids, was provided by the PCNE model...
  19. doi request reprint Surface characteristics and adhesion behavior of Escherichia coli O157:H7: role of extracellular macromolecules
    Hyunjung N Kim
    Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, USA
    Biomacromolecules 10:2556-64. 2009
    ..This finding provides important insight into the role of macromolecule-induced E. coli O157:H7 interactions in aquatic environments...
  20. doi request reprint Reuse of concentrated animal feeding operation wastewater on agricultural lands
    Scott A Bradford
    U S Salinity Lab, USDA ARS, Riverside, CA 92507, USA
    J Environ Qual 37:S97-S115. 2008
    ..Specifically, we address the source, composition, application practices, environmental issues, transport pathways, and potential treatments that are associated with the reuse of CAFO wastewater on agricultural lands...
  21. ncbi request reprint Release of Cryptosporidium and Giardia from dairy calf manure: impact of solution salinity
    Scott A Bradford
    George E Brown, Jr, Salinity Laboratory, USDA, ARS, Riverside, California 92507 4617, USA
    Environ Sci Technol 36:3916-23. 2002
    ..The calibrated model yielded a reasonable description of the experimental results...
  22. ncbi request reprint Modeling colloid attachment, straining, and exclusion in saturated porous media
    Scott A Bradford
    George E Brown, Jr, Salinity Laboratory, USDA, ARS, 450 West Big Springs Road, Riverside, California 92507 4617, USA
    Environ Sci Technol 37:2242-50. 2003
    ..Velocity enhancement due to colloid exclusion was predicted to increase with increasing exclusion volume and increasing soil gradation...
  23. ncbi request reprint Entrapment and dissolution of DNAPLs in heterogeneous porous media
    Scott A Bradford
    George E Brown, Jr, US Salinity Laboratory, USDA, ARS, 450 W Big Springs Road, Riverside, CA 92507 4617, USA
    J Contam Hydrol 67:133-57. 2003
    ..In heterogeneous systems, capillary barriers that produced high PCE saturations tended to exhibit longer dissolution times...
  24. ncbi request reprint Transport of giardia and manure suspensions in saturated porous media
    Scott A Bradford
    USDA ARS, George E Brown Jr Salinity Lab, 450 W Big Springs Rd, Riverside, CA 92507 4617, USA
    J Environ Qual 35:749-57. 2006
    ..Hence, pathogen transport studies conducted in the absence of manure suspension may underestimate transport potential in manure-contaminated environments...
  25. doi request reprint Environmental impacts and sustainability of degraded water reuse
    Dennis L Corwin
    USDA ARS, United States Salinity Lab, 450 West Big Springs Rd, Riverside, CA 92507 4617, USA
    J Environ Qual 37:S1-7. 2008
    ..The future prognosis of degraded water reuse is promising, provided close attention is paid to managing constituents that pose short- and long-term threats to the environment and the health of humankind...