Virus transport and removal in wastewater during aquifer recharge

Powelson, David K.; Gerba, Charles P.; Yahya, Moyasar T.

doi:10.1016/0043-1354(93)90167-g

Cited by 84 publications

(43 citation statements)

References 13 publications

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“…These results are in general agreement with previous efforts by such workers as and Powelson et al (1993) in that preferred (high-permeability) pathways played a key role in advancing particles through the flow field and that media coiitacts represented regions of increased deposition. In comparing our efforts with those reported by Harvey et ai.…”

Section: Discussionsupporting

confidence: 83%

“…Further, there was some suggestion by these workers that early arrival of their microorganisms was related to the presence of extended preferred pathways consisting of horizontally extensive zones of media with similar conductive properties. Powelson et al (1993) also documented the importance of preferred pathways for virus migration in a study of the infiltration of viruses with wastewater. It was also " ' - ' -suggested in that study that inleifaces within the iiiedium b c t w z e~~ dilkrent g~clrn &es nidy pldy ail iiiipoitdnt iulc iii the clistiibulioll of vi1 uscs wiiluii tllz subsulfaLc.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Final Report to the Subsurface Science Program - Impact of Measurement Instrument and Conceptual Model on Analysis of Subsurface Heterogeneity

Silliman¹

2003

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Final Report to the Subsurface Science Program - Impact of Measurement Instrument and Conceptual Model on Analysis of Subsurface Heterogeneity

Silliman¹

2003

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“…This means that the network of pores visited by colloidal particles is not the same as for bromide. A rapid perception of colloidal particles is observed in the elution curves ( Figure 5) Three hypotheses are proposed in literature to explain this phenomenon: 1) colloidal particles have a molecular diffusion coefficient lower than bromide which excludes areas of low flow velocity [39] 2) they can be excluded from a part of porosity where pores size is smaller than colloidal particles [40], therefore their path is less tortuous; this phenomenon has already been observed in a sandy soils [41]; and 3), in a pore with a large enough radius, colloidal particles are transported usually through the center of the pore where the flow rates are highest in contrast to solutes which may approach the pore walls [42]. This is qualified as the steric exclusion phenomenon, which explains the rapid flow of colloidal particles.…”

Section: Transfer and Retention Of Colloidal Particlesmentioning

confidence: 99%

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

Predelus¹,

Lassabatère²,

Coutinho³

et al. 2014

JWARP

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In recent years, many studies have been carried out on colloidal particle transfer in the unsaturated zone because they can be a risk to the environment either directly or as a vector of pollutants. A study was conducted on the influence of porous media structure in unsaturated conditions on colloidal particle transport. Three granular materials were set up in columns to replicate a fluvio-glacial soil from the unsaturated zone in the Lyon area (France). It is a sand, a bimodal mixture in equal proportion by weight of sand and gravel, and a fraction of bimodal mixture. Nanoparticles of silica (SiO2-Au-FluoNPs), having a hydrodynamic diameter between 50 and 60 nm, labeled by organic fluorescent molecules were used to simulate the transport of colloidal particles. A nonreactive tracer, bromide ion (Br − ) at a concentration of C0,s = 10 −2 M was used to determine the hydrodispersive properties of porous media. The tests were carried out first, with a solution of nanoparticles (C0,p = 0.2 g/L) and secondly, with a solution of nanoparticles and bromine. The transfer model based on fractionation of water into two phases, mobile and immobile, MIM, correctly fits the elution curves. The retention of colloidal particles is greater in the two media of bimodal particle size than that in the sand, which clearly demonstrates the role of textural heterogeneity in the retention mechanism. The increase in ionic strength produced by alimenting the columns with colloidal particle suspension in the presence of bromide, increases retention up to 25% in the sand. The total concentration profile of nanoparticles collected at the end of the experiment shows that the colloidal particles are retained primarily at the entrance of the columns. Hydrodispersive calculated parameters indicate that flow is more heterogeneous in bimodal media compared to sand. Keywords 697

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“…For nonperiodic or heterogeneous porous media, where REV selection Previous studies have suggested that colloid transport in porous media is significantly affected by particle size [Fontes et al, 1991, Gannon et al, 1991. Early breakthrough of colloids and biocolloids as compared to that of conservative tracers has been observed in several studies [Bales et al, 1989;Toran and Palumbo, 1992;Powelson et al, 1993;Grindrod et al, 1996;Dong et al, 2002;Keller et al, 2004;Vasiliadou and Chrysikopoulos, 2011;Sinton et al, 2012;Syngouna and Chrysikopoulos, 2013;Chrysikopoulos and Syngouna, 2014]. Colloid early breakthrough can be attributed to effective porosity reduction (colloids cannot penetrate smaller pores due to their inability to fit into them), preferential flow paths through high-conductivity regions, and exclusion from the lower-velocity regions [Chrysikopoulos and Abdel-Salam, 1997;Dong et al, 2002;Ginn, 2002;Ahfir et al, 2009], which can also be viewed as a reduction of the effective porosity of the porous medium [Morley et al, 1998].…”

Section: Introductionmentioning

confidence: 99%

Colloid particle size‐dependent dispersivity

Chrysikopoulos,

Katzourakis

2015

Water Resources Research

130

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Laboratory and field studies have demonstrated that dispersion coefficients evaluated by fitting advection-dispersion transport models to nonreactive tracer breakthrough curves do not adequately describe colloid transport under the same flow field conditions. Here an extensive laboratory study was undertaken to assess whether the dispersivity, which traditionally has been considered to be a property of the porous medium, is dependent on colloid particle size and interstitial velocity. A total of 48 colloid transport experiments were performed in columns packed with glass beads under chemically unfavorable colloid attachment conditions. Nine different colloid diameters and various flow velocities were examined. The breakthrough curves were successfully simulated with a mathematical model describing colloid transport in homogeneous, water-saturated porous media. The experimental data set collected in this study demonstrated that the dispersivity is positively correlated with colloid particle size, and increases with increasing velocity. The dispersivity values determined in this laboratory study were compared with 380 dispersivity values from earlier laboratory and field-scale solute, colloid and biocolloid transport studies published in the literature.

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Virus transport and removal in wastewater during aquifer recharge

Cited by 84 publications

References 13 publications

Final Report to the Subsurface Science Program - Impact of Measurement Instrument and Conceptual Model on Analysis of Subsurface Heterogeneity

Final Report to the Subsurface Science Program - Impact of Measurement Instrument and Conceptual Model on Analysis of Subsurface Heterogeneity

Tracing Water Flow and Colloidal Particles Transfer in an Unsaturated Soil

Colloid particle size‐dependent dispersivity

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