Numerical analysis of bacterial transport in saturated porous media

Kim, Song-Bae

doi:10.1002/hyp.5930

Cited by 91 publications

(33 citation statements)

References 33 publications

(30 reference statements)

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“…Summary of parameters used in the GEBIK and GEBIF equations in the cases of full solution and approximate BFEI-QSS solution for the experiments of N 2 O production and consumption from Menyailo and Hungate [2006] (M&H2006) and Mariotti et al [1981] (M1981). The parameters in parentheses in the first column were calibrated, the value z = 0.01 was assigned arbitrarily under the assumption that E/B is small, µ = 10 −6 s −1 was chosen within the range of values reported in Kim [2006] and Salem et al [2005], while S 0 , B 0 , and E 0 were determined from the experiments. The reference isotopic ratio R std = 2.305 · 10 −2 was used.…”

Section: Resultsmentioning

confidence: 99%

Mathematical treatment of isotopologue and isotopomer speciation and fractionation in biochemical kinetics

Maggi

Riley

2010

Geochimica et Cosmochimica Acta

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Abstract.We present a mathematical treatment of the kinetic equations that describe isotopologue and isotopomer speciation and fractionation during enzymecatalyzed biochemical reactions. These equations, presented here with the name GEBIK (General Equations for Biochemical Isotope Kinetics) and GEBIF (General Equations for Biochemical Isotope Fractionation), take into account microbial biomass and enzyme dynamics, reaction stoichiometry, isotope substitution number, and isotope location within each isotopologue and isotopomer.In addition to solving the complete GEBIK and GEBIF, we also present and discuss two approximations to the full solutions under the assumption of biomassfree and enzyme steady-state, and under the quasi-steady-state assumption as applied to the complexation rate. The complete and approximate approaches are applied to observations of biological denitrification in soils. Our analysis highlights that the full GEBIK and GEBIF provide a more accurate description of concentrations and isotopic compositions of substrates and products throughout the reaction than do the approximate forms. We demonstrate that the isotopic effects of a biochemical reaction depend, in the most general case, on substrate and complex concentrations and, therefore, the fractionation factor is a function of time. We also demonstrate that inverse isotopic effects can occur for values of the fractionation factor smaller than 1, and that reactions that do not discriminate isotopes do not necessarily imply a fractionation factor equal to 1.

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Section: Resultsmentioning

confidence: 99%

Mathematical treatment of isotopologue and isotopomer speciation and fractionation in biochemical kinetics

Maggi

Riley

2010

Geochimica et Cosmochimica Acta

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“…Water was applied with a watering can. One water sample from each of the four monoliths was collected at 3,6,18,21,25,29,41,45, and 49 h after manure application.…”

Section: Methodsmentioning

confidence: 99%

“…Preferential water movement in macropores is probably the primary route by which bacteria move down through the soil (1,2,23). Studies of bacterial transport have been made mostly on homogenized natural soils in laboratory soil columns (2,18,30,33). The purpose of our study was to perform a large-scale experiment using intact 100-cm-deep soil monoliths to compare the leaching of Salmonella serovar Typhimurium in two structurally different soils: a loamy soil with high absorptive properties and macropores and a coarse sandy soil with less-absorptive properties and less preferential flow.…”

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confidence: 99%

Transport and Distribution ofSalmonella entericaSerovar Typhimurium in Loamy and Sandy Soil Monoliths with Applied Liquid Manure

Bech

Johnsen

Dalsgaard

et al. 2010

Appl Environ Microbiol

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A leaching experiment, where liquid manure spiked with Salmonella enterica serovar Typhimurium (Tet ؉ ) DSM554 was applied to soil surfaces, was conducted on intact soil monoliths (60 cm in diameter and 100 cm long). A total of 6.5 ؋ 10 10 CFU was applied to each column. We found that Salmonella serovar Typhimurium could be transported to a 1-m depth in loamy soil at concentrations reaching 1.3 ؋ 10 5 CFU/ml of leachate. The test strain was found in concentrations ranging from 300 to 1.3 5 cells/ml in loamy soil throughout the 27 days of the experiment, while concentrations below 20 cells/ml were sporadically detected in the leachates from sandy monoliths. Real-time PCR targeting invA DNA showed a clear correspondence between the total and culturable numbers of cells in the leachate, indicating that most cells leached were viable. On day 28, distribution of Salmonella serovar Typhimurium at five depths in the four monoliths was determined. The highest recovery rate, ranging from 1.5% to 3.8% of the total applied inoculum, was found in the top 0.2 m.

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“…Reversible equilibrium adsorption and filtration are the two main ways for bacterial attachment. Filtration may cover both reversibly and irreversibly attached bacteria [10,20,21,35,40,51,56]. In tight rocks such as chalk bacteria may be filtered out, as described in the deep bed filtration theory, where it is generally believed that the 1/3 − 1/7 rule can be applied [52].…”

Section: Attachmentmentioning

confidence: 99%

“…The biological factors include bacterial sizes and shapes [31,62], surface hydrophobicity [1,62], tendency to form agglomerates [31], electrostatic, or surface charge [35,45,62]. Characteristics of the porous medium contributing to the attachment are also the surface charge, as well as the pore throat sizes [35,45].…”

Section: Attachmentmentioning

confidence: 99%

Microbial enhanced oil recovery—a modeling study of the potential of spore-forming bacteria

2015

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Microbial enhanced oil recovery (MEOR) utilizes microbes for enhancing the recovery by several mechanisms, among which the most studied are the following: (1) reduction of oil-water interfacial tension (IFT) by the produced biosurfactant and (2) selective plugging by microbes and metabolic products. One of the ways of bacterial survival and propagation under harsh reservoir conditions is formation of spores. A model has been developed that accounts for bacterial growth, substrate consumption, surfactant production, attachment/filtering out, sporulation, and reactivation. Application of spore-forming bacteria is an advantageous novelty of the present approach. The mathematical setup is a set of 1D transport equations involving reactions and attachment. Characteristic sigmoidal curves are used to describe sporulation and reactivation in response to substrate concentrations. The role of surfactant is modification of the relative permeabilities by decreasing the interfacial tension. Attachment of bacteria reduces the pore space available for flow, i.e., the effective porosity and permeability. Clogging of specific areas may occur. An extensive study of the MEOR on the basis of the developed model has resulted in the following conclusions. In order to obtain sufficient local concentrations of surfactant, substantial amounts of substrate should be supplied; however, massive growth of bacteria increases the risk for clogging at the well inlet areas, causing injectivity loss. In such areas, starvation may cause sporulation, reducing the risk of clogging. Substrate released during sporulation can be utilized by attached vegetative bacteria and they will continue growing and producing surfactant, which prolongs the effect of the injected substrate. The simulation scenarios show that application of the spore-forming bacteria gives a higher total production of surfactant and the reduced risk of clogging, leading to an increased period of production and a higher oil recovery.

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Numerical analysis of bacterial transport in saturated porous media

Cited by 91 publications

References 33 publications

Mathematical treatment of isotopologue and isotopomer speciation and fractionation in biochemical kinetics

Mathematical treatment of isotopologue and isotopomer speciation and fractionation in biochemical kinetics

Transport and Distribution ofSalmonella entericaSerovar Typhimurium in Loamy and Sandy Soil Monoliths with Applied Liquid Manure

Microbial enhanced oil recovery—a modeling study of the potential of spore-forming bacteria

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