Breakthrough Curves and Simulation of Virus Transport through Fractured Porous Media

Ojha, C. S. P.; Surampalli, Rao Y.; Sharma, Pramod Kumar; Joshi, Nitin

doi:10.1061/(asce)ee.1943-7870.0000374

Cited by 15 publications

(7 citation statements)

References 29 publications

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“…7 that as the mass transfer coefficient is increased, the concentration of virus decreases along the fracture. This observation is similar to that observed by Ojha et al (2011) but the pattern of the concentration profile is completely different due to the presence of fracture-skin. When the mass transfer coefficient is zero, the relative concentration of viruses in the fracture remains as 1 up to 125 m of the fracture length.…”

Section: Resultssupporting

confidence: 89%

“…Sharma and Srivastava (2011) developed a numerical model to simulate virus transport through two-dimensional heterogeneous porous media at field scale to investigate the effect of inactivation and mass transfer rate constants on the relative concentration profile in two observation wells. Ojha et al (2011) recently developed a numerical model to investigate the transport processes of the movement of viruses in a fractured rock. They also simulated the experimental data of biocolloids through the fractured aquifer model.…”

Section: Introductionmentioning

confidence: 99%

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Effect of fracture-skin on virus transport in fractured porous media

Natarajan

Kumar²

2012

Geoscience Frontiers

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effect of fracture-skin on virus transport in fractured porous media

Natarajan

Kumar²

2012

Geoscience Frontiers

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“…This may occur by direct ingress at the wellhead via overland flow, ingress of shallow groundwater through cracked well liners or rapid transport of contaminants to the producing sections of the private source due to faulty or absent waterproofing (i.e., source‐specific characteristics). This finding is considered significant, as rapid entry of contaminated overland flow (direct wellhead ingress) or shallow groundwater infiltration (bypass flow) may result in higher viable bacterial concentrations in contaminated wells, due to decreased natural attenuation/inactivation in underlying subsoils through filtration and absorption and subsequently decreased residence time in the environment [ Gill et al , 2009; Ojha et al , 2011].…”

Section: Discussionmentioning

confidence: 99%

Development of a microbial contamination susceptibility model for private domestic groundwater sources

Hynds¹,

Misstear²,

Gill³

2012

Water Resources Research

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[1] Groundwater quality analyses were carried out on samples from 262 private sources in the Republic of Ireland during the period from April 2008 to November 2010, with microbial quality assessed by thermotolerant coliform (TTC) presence. Assessment of potential microbial contamination risk factors was undertaken at all sources, and local meteorological data were also acquired. Overall, 28.9% of wells tested positive for TTC, with risk analysis indicating that source type (i.e., borehole or hand-dug well), local bedrock type, local subsoil type, groundwater vulnerability, septic tank setback distance, and 48 h antecedent precipitation were all significantly associated with TTC presence (p < 0.05). A number of source-specific design parameters were also significantly associated with bacterial presence. Hierarchical logistic regression with stepwise parameter entry was used to develop a private well susceptibility model, with the final model exhibiting a mean predictive accuracy of >80% (TTC present or absent) when compared to an independent validation data set. Model hierarchies of primary significance are source design (20%), septic tank location (11%), hydrogeological setting (10%), and antecedent 120 h precipitation (2%). Sensitivity analysis shows that the probability of contamination is highly sensitive to septic tank setback distance, with probability increasing linearly with decreases in setback distance. Likewise, contamination probability was shown to increase with increasing antecedent precipitation. Results show that while groundwater vulnerability category is a useful indicator of aquifer susceptibility to contamination, its suitability with regard to source contamination is less clear. The final model illustrates that both localized (well-specific) and generalized (aquifer-specific) contamination mechanisms are involved in contamination events, with localized bypass mechanisms dominant. The susceptibility model developed here could be employed in the appropriate location, design, construction, and operation of private groundwater wells, thereby decreasing the contamination risk, and hence health risk, associated with these sources.

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“…The details about the conceptualization, their assumptions, and limitations have been reported elsewhere [ Committee on Fracture Characterization and Fluid Flow, National Research Council , ]. The governing equation for the fracture‐matrix system can be solved using either analytical techniques [ Tang et al ., ; Neretnieks , ; Grisak et al ., 1981; Bibby , ; Sudicky and Frind , ; Barker , ; Moreno and Rasmuson , ; Maloszewski and Zuber , ; Roubinet et al ., ] or numerical techniques [ Grisak et al ., ; Noorishad and Mehran , ; Huyakorn et al ., ; Sekhar et al ., ; Suresh Kumar , ; Ojha et al ., ; Joshi et al ., ]. However, the numerical techniques are more common due to its ability to handle complex initial and boundary conditions along with the sorption nonlinearity.…”

Section: Introductionmentioning

confidence: 99%

“…However, very few studies consider the nonequilibrium sorption in the fractured porous media [ Maloszewski and Zuber , ; Lee and Teng , ; Berkowitz and Zhou , ; Xu and Worman , ; Bodin et al ., , Ojha et al ., ; Joshi et al ., ; Sharma et al ., ]. Most of the available models neglect the effect of sorption kinetics in the fracture‐matrix system and are based on the local equilibrium assumption (LEA).…”

Section: Introductionmentioning

confidence: 99%

Application of nonequilibrium fracture matrix model in simulating reactive contaminant transport through fractured porous media

et al. 2015

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Nonequilibrium and nonlinear sorption of the contaminants in the fractured porous media could significantly influence the shape of the breakthrough curve (BTC). For the fracture-matrix system, there are very few studies which consider these processes. In this study, the nonequilibrium fracture-matrix model with two different nonlinear sorption isotherms, namely nonlinear Freundlich and Langmuir sorption isotherms were developed. The effect of sorption nonlinearity and nonequilibrium conditions on the shape of the BTC was studied using the temporal moments. The developed models along with the linear equilibrium, linear nonequilibrium fracture matrix models, and the multirate mass transfer model were used to simulate the BTC, which were compared with the experimental data available in the literature. Both sorption nonequilibrium and nonlinearity were found to significantly influence the shape of the BTC. Presence of sorption nonlinearity reduces the solute spreading, whereas presence of nonequilibrium conditions increases the solute spreading. Considering the sorption nonequilibrium along with the sorption nonlinearity leads to an improved simulation of the BTC. The nonequilibrium nonlinear sorption models could simulate the extended BTC tailing resulting from sorption nonlinearity and rate-limited interaction in the fracture-matrix system.

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Breakthrough Curves and Simulation of Virus Transport through Fractured Porous Media

Cited by 15 publications

References 29 publications

Effect of fracture-skin on virus transport in fractured porous media

Effect of fracture-skin on virus transport in fractured porous media

Development of a microbial contamination susceptibility model for private domestic groundwater sources

Application of nonequilibrium fracture matrix model in simulating reactive contaminant transport through fractured porous media

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