Ronald W Harvey (Former Employee)
Science and Products
Filter Total Items: 80
Use of carboxylated microspheres to assess transport potential of Cryptosporidium parvum oocysts at the Russian River water supply facility, Sonoma County, California
Carboxylated microspheres were employed as surrogates to assess the transport potential of Cryptosporidium parvumoocysts during forced- and natural-gradient tests conducted in July and October 2004. The tests involved poorly-sorted, near-surface sediments where groundwater is pumped from an alluvial aquifer underlying the Russian River, Sonoma County, CA. In an off channel infiltration...
Authors
David W. Metge, Ronald W. Harvey, Robert Anders, Donald Rosenberry, Donald Seymour, James Jasperse
Effect of ferric oxyhydroxide grain coatings on the transport of bacteriophage PRD1 and Cryptosporidium parvum oocysts in saturated porous media
To test the effect of geochemical heterogeneity on microorganism transport in saturated porous media, we measured the removal of two microorganisms, the bacteriophage PRD1 and oocysts of the protozoan parasite Cryptosporidium parvum, in flow-through columns of quartz sand coated by different amounts of a ferric oxyhydroxide. The experiments were conducted over ranges of ferric...
Authors
R.A. Abudalo, Y.G. Bogatsu, J. N. Ryan, Ronald W. Harvey, D.W. Metge, Menachem Elimelech
Assessing the vulnerability of a municipal well field to contamination in a karst aquifer
Proposed expansion of extractive lime-rock mines near the Miami-Dade County Northwest well field and Everglades wetland areas has garnered intense scrutiny by government, public, environmental stakeholders, and the media because of concern that mining will increase the risk of pathogen contamination. Rock mines are excavated to the same depth as the well field's primary producing zone...
Authors
R.A. Renken, K.J. Cunningham, Michael R. Zygnerski, M.A. Wacker, Allen M. Shapiro, Ronald W. Harvey, D.W. Metge, C.L. Osborn, J. N. Ryan
Evaluating microbial purification during soil treatment of wastewater with multicomponent tracer and surrogate tests
Soil treatment of wastewater has the potential to achieve high purification efficiency, yet the understanding and predictability of purification with respect to removal of viruses and other pathogens is limited. Research has been completed to quantify the removal of virus and bacteria through the use of microbial surrogates and conservative tracers during controlled experiments with...
Authors
S. Van Cuyk, R.L. Siegrist, K. Lowe, Ronald W. Harvey
Effect of cell physicochemical characteristics and motility on bacterial transport in groundwater
The influence of physicochemical characteristics and motility on bacterial transport in groundwater were examined in flow-through columns. Four strains of bacteria isolated from a crystalline rock groundwater system were investigated, with carboxylate-modified and amidine-modified latex microspheres and bromide as reference tracers. The bacterial isolates included a gram-positive rod...
Authors
M.W. Becker, S.A. Collins, D.W. Metge, Ronald W. Harvey, Allen M. Shapiro
Transport of Cryptosporidium oocysts in porous media: Role of straining and physicochemical filtration
The transport and filtration behavior of Cryptosporidium parvum oocysts in columns packed with quartz sand was systematically examined under repulsive electrostatic conditions. An increase in solution ionic strength resulted in greater oocyst deposition rates despite theoretical predictions of a significant electrostatic energy barrier to deposition. Relatively high deposition rates...
Authors
N. Tufenkji, G.F. Miller, J. N. Ryan, Ronald W. Harvey, Menachem Elimelech
Science and Products
Filter Total Items: 80
Use of carboxylated microspheres to assess transport potential of Cryptosporidium parvum oocysts at the Russian River water supply facility, Sonoma County, California
Carboxylated microspheres were employed as surrogates to assess the transport potential of Cryptosporidium parvumoocysts during forced- and natural-gradient tests conducted in July and October 2004. The tests involved poorly-sorted, near-surface sediments where groundwater is pumped from an alluvial aquifer underlying the Russian River, Sonoma County, CA. In an off channel infiltration...
Authors
David W. Metge, Ronald W. Harvey, Robert Anders, Donald Rosenberry, Donald Seymour, James Jasperse
Effect of ferric oxyhydroxide grain coatings on the transport of bacteriophage PRD1 and Cryptosporidium parvum oocysts in saturated porous media
To test the effect of geochemical heterogeneity on microorganism transport in saturated porous media, we measured the removal of two microorganisms, the bacteriophage PRD1 and oocysts of the protozoan parasite Cryptosporidium parvum, in flow-through columns of quartz sand coated by different amounts of a ferric oxyhydroxide. The experiments were conducted over ranges of ferric...
Authors
R.A. Abudalo, Y.G. Bogatsu, J. N. Ryan, Ronald W. Harvey, D.W. Metge, Menachem Elimelech
Assessing the vulnerability of a municipal well field to contamination in a karst aquifer
Proposed expansion of extractive lime-rock mines near the Miami-Dade County Northwest well field and Everglades wetland areas has garnered intense scrutiny by government, public, environmental stakeholders, and the media because of concern that mining will increase the risk of pathogen contamination. Rock mines are excavated to the same depth as the well field's primary producing zone...
Authors
R.A. Renken, K.J. Cunningham, Michael R. Zygnerski, M.A. Wacker, Allen M. Shapiro, Ronald W. Harvey, D.W. Metge, C.L. Osborn, J. N. Ryan
Evaluating microbial purification during soil treatment of wastewater with multicomponent tracer and surrogate tests
Soil treatment of wastewater has the potential to achieve high purification efficiency, yet the understanding and predictability of purification with respect to removal of viruses and other pathogens is limited. Research has been completed to quantify the removal of virus and bacteria through the use of microbial surrogates and conservative tracers during controlled experiments with...
Authors
S. Van Cuyk, R.L. Siegrist, K. Lowe, Ronald W. Harvey
Effect of cell physicochemical characteristics and motility on bacterial transport in groundwater
The influence of physicochemical characteristics and motility on bacterial transport in groundwater were examined in flow-through columns. Four strains of bacteria isolated from a crystalline rock groundwater system were investigated, with carboxylate-modified and amidine-modified latex microspheres and bromide as reference tracers. The bacterial isolates included a gram-positive rod...
Authors
M.W. Becker, S.A. Collins, D.W. Metge, Ronald W. Harvey, Allen M. Shapiro
Transport of Cryptosporidium oocysts in porous media: Role of straining and physicochemical filtration
The transport and filtration behavior of Cryptosporidium parvum oocysts in columns packed with quartz sand was systematically examined under repulsive electrostatic conditions. An increase in solution ionic strength resulted in greater oocyst deposition rates despite theoretical predictions of a significant electrostatic energy barrier to deposition. Relatively high deposition rates...
Authors
N. Tufenkji, G.F. Miller, J. N. Ryan, Ronald W. Harvey, Menachem Elimelech