Influence of mineral precipitation on the performance and long-term stability of Fe 0 -permeable reactive barriers: A review on the basis of 19 Fe 0 -reactive barrier sites

Parbs, Anika; Ebert, M.; Dahmke, Andreas

doi:10.1007/s00767-007-0043-8

Cited by 7 publications

(3 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This allows for the simulation of numerous applied hydro-geochemical environmental engineering problems where mineral reactions have an important influence on the physical properties of partially saturated soils. Possible applications include vadose zone biodegradation processes [31,32], water management practices and irrigation techniques in arid and semiarid areas [33][34][35], salinity management [36][37][38][39] and the assessment of the longterm performance of reactive barriers [40][41][42][43][44][45][46]. Below, we present the theoretical model derivation followed by applications of the model to the case of kinetic halite dissolution in different moisture conditions and calcite precipitation due to cation exchange.…”

Section: Fig 1 Near Herementioning

confidence: 99%

See 1 more Smart Citation

Effect of mineral reactions on the hydraulic properties of unsaturated soils: Model development and application

Wissmeier

Barry

2009

Advances in Water Resources

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. ACCEPTED MANUSCRIPT AbsThe selective radius shift model was used to relate changes in mineral volume due to precipitation/dissolution reactions to changes in hydraulic properties affecting flow in porous media. The model accounts for (i) precipitation/dissolution taking place only in the water-filled part of the pore space and further that (ii) the amount of mineral precipitation/dissolution within a pore depends on the local pore volume. The pore bundle concept was used to connect pore-scale changes to macroscopic soil hydraulic properties. Precipitation/dissolution induces changes in the pore radii of water-filled pores and, consequently, in the effective porosity. In a time step of the numerical model, mineral reactions lead to a discontinuous pore-size distribution because only the water-filled pores are affected. The pore-size distribution is converted back to a soil moisture characteristic function to which a new water retention curve is fitted under physically plausible constraints. The model equations were derived for the commonly used van Genuchten/Mualem hydraulic properties. Together with a mixed-form solution of Richards' equation for aqueous phase flow, the model was implemented into the geochemical modelling framework PHREEQC, thereby making available PHREEQC's comprehensive geochemical reactions. Example applications include kinetic halite dissolution and calcite precipitation as a consequence of cation exchange. These applications showed marked changes in the soil's hydraulic properties due to mineral precipitation/dissolution and the dependency of these changes on water contents. The simulations also revealed the strong influence of the degree of saturation on the development of the saturated hydraulic conductivity through its quadratic dependency on the van Genuchten parameter . Furthermore, it was shown that the unsaturated hydraulic conductivity at fixed reduced water content can even r tract increase du ing precipitation due to changes in the pore-size distribution.

show abstract

Section: Fig 1 Near Herementioning

confidence: 99%

“…This simulation was performed with the same column properties (Table 2) minerals precipitate due to adsorption-desorption processes [43,44,90]. Reactive barriers are designed to protect groundwater aquifers from contamination by adsorbing pollutants (e.g., heavy metals) onto the solid soil structure.…”

Section: Quasi Steady State Flow; Low Moisture Contentmentioning

confidence: 99%

Effect of mineral reactions on the hydraulic properties of unsaturated soils: Model development and application

Wissmeier

Barry

2009

Advances in Water Resources

View full text Add to dashboard Cite

show abstract

“…Of particular importance is ensuring; all flow is intercepted, that is flow is funneled towards the reactive gate and no short circuiting of the gate occurs. This must hold even as precipitates are formed (Parbs et al, 2007), gas is evolved (Henderson and Demond, 2011), hydrocarbons captured (Mumford et al, 2013) or biofilms grown (Seki et al, 2006 A number of approaches can be used to evaluate the hydraulic performance of PRB installations including hydraulic gradient measurements combined with hydraulic conductivity data (Gavaskar et al, 2002), in situ flow measurements (Gavaskar et al, 2002), tracer tests and geochemical changes measured upand down-gradient of the PRB coupled with mass balance calculations (Wilkin et al, 2003). However, on occasion these methods vary in their conclusions or have limits on their accuracy.…”

Section: Introductionmentioning

confidence: 93%

Hydraulic performance of a permeable reactive barrier at Casey Station, Antarctica

et al. 2014

View full text Add to dashboard Cite

Coupled Electrokinetic–Permeable Reactive Barriers

Weng¹

2009

Electrochemical Remediation Technologies for Polluted Soils, Sediments and Groundwater

View full text Add to dashboard Cite

Influence of mineral precipitation on the performance and long-term stability of Fe 0 -permeable reactive barriers: A review on the basis of 19 Fe 0 -reactive barrier sites

Cited by 7 publications

References 42 publications

Effect of mineral reactions on the hydraulic properties of unsaturated soils: Model development and application

Effect of mineral reactions on the hydraulic properties of unsaturated soils: Model development and application

Hydraulic performance of a permeable reactive barrier at Casey Station, Antarctica

Coupled Electrokinetic–Permeable Reactive Barriers

Contact Info

Product

Resources

About