Modeling of biologically mediated redox processes in the subsurface

Lensing, Hermann-Josef; Vogt, Manfred; Herrling, B.

doi:10.1016/0022-1694(94)90252-6

Cited by 87 publications

(57 citation statements)

References 22 publications

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“…Models with variable kinetics based on microbially mediated redox reactions are frequently used for the simulation of organic carbon degradation in sediments and aquifers (e.g. KINDRED & CELIA, 1989;LENSING et al, 1994;MACQUARRIE et al, 1990;SCHÄFER et al, 1998;WIDDOWSON et al, 1988).…”

Section: Models With Variable Kineticsmentioning

confidence: 99%

Redox: fundamentals, processes, and applications

Schüring¹,

Schulz²,

Böttcher³

et al. 2000

Choice Reviews Online

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Section: Models With Variable Kineticsmentioning

confidence: 99%

Redox: fundamentals, processes, and applications

Schüring¹,

Schulz²,

Böttcher³

et al. 2000

Choice Reviews Online

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“…Numerical models have been increasingly used for this purpose, a trend that will continue because more sophisticated models and codes are being developed and computer costs keep decreasing. Significant efforts and attempts have been made during recent years toward the development of such tools (Kirkner et al, 1985;Kaluarachchi and Parker, 1990;Steefel and Van Cappellen, 1990;Lensing et al, 1994;Salvage and Yeh, 1998;Ayora et al, 1998;Steefel and Lichtner, 1998;Tebes-Stevens et al, 1998;Yabusaki et al, 1998;Chilakapati et al, 2000;Saaltink et al, 2000;Xu et al, 2000;Yeh, 2000;Ginn et al, 2001;Regnier et al, 2002;Saaltink et al, 2003;Pruess et al, 2004;Maher et al, 2006;Yang, 2006;Yang et al, 2007;Yang et al, 2008a,b). A recent review on reactive transport modelling is presented by Steefel et al(2005).…”

Section: Introductionmentioning

confidence: 99%

A sequential partly iterative approach for multicomponent reactive transport with CORE2D

Samper

Yang

2008

Comput Geosci

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“…Based on these biological and geochemical processes, trace metals dynamics in groundwater have been described by several authors [e.g., Yeh and Tripathi, 1991;Engesgraad and Kipp, 1992;Lensing et al, 1994]. Although, in many of these studies, it was assumed that the metal is at equilibrium with the surrounding geochemistry, this is clearly not always the case.…”

Section: Introductionmentioning

confidence: 99%

“…Some of these models have been extended to include abiotic redox reactions and geochemical processes such as speciation and precipitation/dissolution [Wang and Van Cappellen, 1996;Hunter et al, 1998;Smith and Jaffé, 1998]. Based on these biological and geochemical processes, trace metals dynamics in groundwater have been described by several authors [e.g., Yeh and Tripathi, 1991;Engesgraad and Kipp, 1992;Lensing et al, 1994]. Although, in many of these studies, it was assumed that the metal is at equilibrium with the surrounding geochemistry, this is clearly not always the case.…”

mentioning

confidence: 99%

Trace Metal Bioremediation: Assessment of Model Components from Laboratory and Field Studies to Identify Critical Variables

Jaffé¹,

Rabitz²

2003

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The objective of this project was to gain an insight into the modeling support needed for the understanding, design, and operation of trace metal/radionuclide bioremediation. To achieve this objective, a workshop was convened to discuss the elements such a model should contain. A "protomodel" was developed, based on the recommendations of the workshop, and was used to perform sensitivity analysis as well as some preliminary simulations in support for bioremediation test experiments at UMTRA sites.To simulate the numerous biogeochemical processes that will occur during the bioremediation of uranium contaminated aquifers, a time-dependent one-dimensional reactive transport model has been developed. The model consists of a set of coupled, steady state mass balance equations, accounting for advection, diffusion, dispersion, and a kinetic formulation of the transformations affecting an organic substrate, electron acceptors, corresponding reduced species, and uranium. This set of equations is solved numerically, using a finite element scheme. The redox conditions of the domain are characterized by estimating the pE, based on the concentrations of the dominant terminal electron acceptor and its corresponding reduced specie. This pE and the concentrations of relevant species are passed to a modified version of MINTEQA2, which calculates the speciation and solubilities of the species of interest. Kinetics of abiotic reactions are described as being proportional to the difference between the actual and equilibrium concentration.A global uncertainty assessment, determined by Random Sampling High Dimensional Model Representation (RS-HDMR), was performed to attain a phenomenological understanding of the origins of output variability and to suggest input parameter refinements as well as to provide guidance for field experiments to improve the quality of the model predictions. Results indicated that for the usually high nitrate contents found ate many DOE sites, overall bioremediation of trace metals was highly sensitive to the formulation of the denitrification process.Simulations were performed to illustrate the effect of biostimulation on the transport and precipitation of uranium in the subsurface, at conditions equivalent to UMTRA sites. These simulations predicted that uranium would precipitate in bands that are located relatively close to the acetate injection well. The simulations also showed the importance of properly determining U(IV) oxidative dissolution rates, in order to assess the stability of precipitates once oxygenated water reenters the aquifer after bioremediation is discontinued.The objective of this project was to provide guidance to NABIR's Systems Integration Element, on the development of models to simulate the bioremediation of trace metals and radionuclides. Such models necessarily need to integrate hydrological, geochemical, and microbiological processes. In order to gain a better understanding of the key processes that such a model should contain, it was deemed desirable to convene a worksh...

show abstract

Modeling of biologically mediated redox processes in the subsurface

Cited by 87 publications

References 22 publications

Redox: fundamentals, processes, and applications

Redox: fundamentals, processes, and applications

A sequential partly iterative approach for multicomponent reactive transport with CORE2D

Trace Metal Bioremediation: Assessment of Model Components from Laboratory and Field Studies to Identify Critical Variables

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