Contaminant transport in dual-porosity media with dissolved organic matter and bacteria present as mobile colloids

Kim, Song-Bae; Çorapçıoğlu, M. Yavuz

doi:10.1016/s0169-7722(02)00043-8

Cited by 30 publications

(19 citation statements)

References 32 publications

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“…Infiltration would bring organisms from the slurry in better contact with the soil environment, and the observed trends in survival thus indicate that E. coli was surviving better in the soil than if retained around a slurry-saturated injection slit. E. coli and Enterococcus species are both facultative anaerobes, and the physical protection against predation obtained when organisms are carried with infiltrating water toward the smaller pores may be an important factor in determining survival (46,47,48). The percentages of surviving microorganisms recovered in S2 to S4 followed the order Enterococcus species Ͻ E. coli Ͻ phage.…”

Section: Resultsmentioning

confidence: 99%

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Persistence and Leaching Potential of Microorganisms and Mineral N in Animal Manure Applied to Intact Soil Columns

Amin

Forslund

Bui

et al. 2013

Appl Environ Microbiol

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Pathogens may reach agricultural soils through application of animal manure and thereby pose a risk of contaminating crops as well as surface and groundwater. Treatment and handling of manure for improved nutrient and odor management may also influence the amount and fate of manure-borne pathogens in the soil. A study was conducted to investigate the leaching potentials of a phage (Salmonella enterica serovar Typhimurium bacteriophage 28B) and two bacteria, Escherichia coli and Enterococcus species, in a liquid fraction of raw pig slurry obtained by solid-liquid separation of this slurry and in this liquid fraction after ozonation, when applied to intact soil columns by subsurface injection. We also compared leaching potentials of surface-applied and subsurface-injected raw slurry. The columns were exposed to irrigation events (3.5-h period at 10 mm h ؊1 ) after 1, 2, 3, and 4 weeks of incubation with collection of leachate. By the end of incubation, the distribution and survival of microorganisms in the soil of each treatment and in nonirrigated columns with injected raw slurry or liquid fraction were determined. E. coli in the leachates was quantified by both plate counts and quantitative PCR (qPCR) to assess the proportions of culturable and nonculturable (viable and nonviable) cells. Solid-liquid separation of slurry increased the redistribution in soil of contaminants in the liquid fraction compared to raw slurry, and the percent recovery of E. coli and Enterococcus species was higher for the liquid fraction than for raw slurry after the four leaching events. The liquid fraction also resulted in more leaching of all contaminants except Enterococcus species than did raw slurry. Ozonation reduced E. coli leaching only. Injection enhanced the leaching potential of the microorganisms investigated compared to surface application, probably because of a better survival with subsurface injection and a shorter leaching path.

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Section: Resultsmentioning

confidence: 99%

“…It could be due to attachment to slurry solids as proposed by Guber et al (59) in a study comparing release of Enterococcus species and E. coli from slurry particles. Also, cells organized in chains could have been more exposed to predation if they were filtered out in larger pores during transport through the soil (46,47).…”

Section: Resultsmentioning

confidence: 99%

Persistence and Leaching Potential of Microorganisms and Mineral N in Animal Manure Applied to Intact Soil Columns

Amin

Forslund

Bui

et al. 2013

Appl Environ Microbiol

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“…Solute transport in a DCCM is described by two coupled advection-dispersion equations. Their complexity depends on model dimensionality, the solid phases considered [15,[17][18][19], the chemical reactions involved, the occurrence of microbial processes [20], and the complexity of the conceptual model. The DCDM model assumes that a matrix block is connected to its surrounding fractures but not to other matrix blocks [21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Lichtner [15] considered aqueous complexation and mineral dissolution/precipitation in a reactive transport DCM for fractured rock. The reactive transport simulator TOUGHREACT with a multiple interacting continua (MINC) feature [26] considers comprehensive chemical reactions in DCM A first-order transfer term is commonly used for the diffusive flux [15,20,23] and for the sum of the convective and the diffusive fluxes [17,18,25,[27][28][29][30][31]. However, the first-order solute transfer term is not accurate over all time scales [9].…”

Section: Introductionmentioning

confidence: 99%

Dual-continuum multicomponent reactive transport with nth-order solute transfer terms for structured porous media

Zheng

Samper

2015

Comput Geosci

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The dual-continuum model (DCM) is a type of modeling approach often used to interpret anomalous and non-ergodic solute transport in which the breakthrough curve cannot be explained by the classical advection-dispersion equation. Experimental studies show that bentonites have a macro-porous domain containing free water and a microporous domain containing double-layer and interlayer water. Therefore, a DCM could be needed to describe water flow, solute transport, and chemical reactions through compacted bentonite. In most DCMs, the mass exchange between domains is based on a lumped first-order solute transfer term which is not always accurate. An nth-order solute transfer term for dual-continuum flow and reactive transport model for structured porous media is proposed here. The value of n is derived from the approximation of the analytical solution of diffusion through a thin slab. The parameters of DCMs are obtained by an inverse methodology. Solute transfer terms for compacted bentonite have been evaluated for 1-D and 2-D synthetic cases by solving the inverse problem for several values of n. The best results are obtained with an n of 0.72 and a scale term of 2.5. The reactive transport DCM has been tested with data from a permeability test conducted on a sample of full-scale engineered barrier experiment (FEBEX) bentonite. By accounting for the solute flux across the micromacro interface, the DCM overcomes the limitations of the single-continuum model (SCM) which fails to reproduce the long tails of the breakthrough curves of most chemical species of this test. The exponent n and the scaling factor were estimated from Cl − data. They are similar to those obtained from the 2-D synthetic case, thus indicating that the exponent and the scaling factor derived for the FEBEX bentonite could be used for other compacted bentonites.

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“…Bacterial transport and retention in soils have been given attention because of their importance in groundwater contamination, subsurface bioremediation, and facilitated transport of pollutants (Abu-Ashour et al, 1994a;Kim and Corapcioglu, 2002;Pierzynski, 2000). Land treatment of wastewater, and land disposal of sewage sludge have produced microbial transport through vadose zone and subsequent contamination of aquifers (Unc and Goss, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effects of Soil Matric Suction on Retention and Percolation of Bacillus Subtilis in Intact Soil Cores

Jiang

Noonan

Ratecliffe

2006

Water Air Soil Pollut

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Bacillus subtilis endospores (resistant to rifampicin) irrigated on the surface of intact soil cores (20 cm diameter × 8 cm length) which were equilibrated under selected suctions, i.e. 0, 0.5, 2, 5, 10 kPa, were then percolated by saturated water flow. The bacterial retention and percolation percentage were significantly correlated with the suctions. The higher retention with higher suction was explained by micropore storage, attachment to static air-water interface (AWI), and irreversible adsorption to soil particles. The bacterial percolation was mainly controlled by initial replacement of pore water storage, and following reversible detachment process. Another sensitivity experiment with four replicates using lincomycin-resistant B. subtilis at 0 and 0.5 kPa suctions revealed that small increase (0 to 0.5 kPa) in soil matric suction incurred a substantial higher level of bacterial retention. Based on our experimental results, soil matric suction was proposed as a comprehensive parameter to monitor bacterial transport and fate for animal waste disposal (irrigation) and subsurface bioremediation.

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Contaminant transport in dual-porosity media with dissolved organic matter and bacteria present as mobile colloids

Cited by 30 publications

References 32 publications

Persistence and Leaching Potential of Microorganisms and Mineral N in Animal Manure Applied to Intact Soil Columns

Persistence and Leaching Potential of Microorganisms and Mineral N in Animal Manure Applied to Intact Soil Columns

Dual-continuum multicomponent reactive transport with nth-order solute transfer terms for structured porous media

Effects of Soil Matric Suction on Retention and Percolation of Bacillus Subtilis in Intact Soil Cores

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