Iron oxide incrustations in wells. Part 1: genesis, mineralogy and geochemistry

Houben, Georg

doi:10.1016/s0883-2927(02)00242-1

Cited by 91 publications

(59 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3, it can be seen that schwertmannite is transformed to goethite at higher pH. Previous studies demonstrated the lower retention of anions, e.g., SO 4 2-, by more crystallized minerals (Houben 2003). Thus, surfaces of schwertmannite and aging products become unfavorable for SO 4 2-retention.…”

Section: Sulfate Release As a Function Of Phmentioning

confidence: 88%

Dissolution Kinetics of Sulfate from Schwertmannite Under Variable pH Conditions

Paikaray

Peiffer

2010

Mine Water Environ

View full text Add to dashboard Cite

Sulfate mobilization was investigated under controlled laboratory conditions. Microbially synthesized schwertmannite (14.7 m 2 /g specific surface area with 4.7 Fe:S molar ratio) was interacted at room temperature for 4 months with aqueous solutions between pH 5 and 8. More than 50% of the solid-phase sulfate was released during the initial 2 months and the rate was positively influenced by pH due to the competition of hydroxyl ions for SO 4 2-. More than 90% of the solid-phase sulfate was released within 4 months at pH 8. Infrared spectra demonstrate diminution and splitting of SO 4 2-adsorption bands, indicating possible structural changes within the solid phase as a result of SO 4 2-release. Transformation of schwertmannite to goethite was triggered by pH increase and was primarily responsible for the sulfate mobilization. Thus, schwertmannite that interacts with neutral to alkaline water can add significantly to the sulfate load of a stream.

show abstract

Section: Sulfate Release As a Function Of Phmentioning

confidence: 88%

Dissolution Kinetics of Sulfate from Schwertmannite Under Variable pH Conditions

Paikaray

Peiffer

2010

Mine Water Environ

View full text Add to dashboard Cite

show abstract

“…The simulation of permeability and tortuosity evolution due to porosity changes is of vital importance for the description of various hydrogeological processes, such as fluid circulation in geothermal systems [1], acid rock drainage (ARD) attenuation and treatment [2], well fouling due to oxide precipitation [3], aquifer storage and recovery (ASR) [4], and the long-term geochemical evolution of host rock considered for high-level nuclear waste (HLW) repositories [5][6][7]. Porosity changes can be the result of many processes including mechanical deformation, swelling of clay minerals (e.g., montmorillonite), dissolution/precipitation, and thermal deformation.…”

Section: Introductionmentioning

confidence: 99%

Implementation and evaluation of permeability-porosity and tortuosity-porosity relationships linked to mineral dissolution-precipitation

et al. 2014

View full text Add to dashboard Cite

Changes of porosity, permeability, and tortuosity due to physical and geochemical processes are of vital importance for a variety of hydrogeological systems, including passive treatment facilities for contaminated groundwater, engineered barrier systems (EBS), and host rocks for high-level nuclear waste (HLW) repositories. Due to the nonlinear nature and chemical complexity of the problem, in most cases, it is impossible to verify reactive transport codes analytically, and code intercomparisons are the most suitable method to assess code capabilities and model performance. This paper summarizes model intercomparisons for six hypothetical scenarios with generally Electronic supplementary material The online version of this article

show abstract

“…They can promote vertical flow in idle wells as they may connect (or short-circuit) zones of different heads and hydrochemical composition (Church and Granato 1996;Houben 2003), which may cause cross-contamination and enhance well ageing.…”

Section: Effect Of Screen and Borehole Lengthmentioning

confidence: 99%

述评:水井水力学—水流定律和几何学的影响

Houben

2015

Hydrogeol J

View full text Add to dashboard Cite

Water wells are an indispensable tool for groundwater extraction. The analytical and empirical approaches available to describe the flow of groundwater towards a well are summarized. Such flow involves a strong velocity increase, especially close to the well. The linear laminar Darcy approach is, therefore, not fully applicable in well hydraulics, as inertial and turbulent flow components occur close to and inside the well, respectively. For common well set-ups and hydraulic parameters, flow in the aquifer is linear laminar, non-linear laminar in the gravel pack, and turbulent in the screen and the well interior. The most commonly used parameter of well design is the entrance velocity. There is, however, considerable debate about which value from the literature should be used. The easiest way to control entrance velocity involves the well geometry. The influence of the diameter of the screen and borehole is smaller than that of the screen length. Minimizing partial penetration can help to curb head losses.

show abstract

Iron oxide incrustations in wells. Part 1: genesis, mineralogy and geochemistry

Cited by 91 publications

References 34 publications

Dissolution Kinetics of Sulfate from Schwertmannite Under Variable pH Conditions

Dissolution Kinetics of Sulfate from Schwertmannite Under Variable pH Conditions

Implementation and evaluation of permeability-porosity and tortuosity-porosity relationships linked to mineral dissolution-precipitation

述评:水井水力学—水流定律和几何学的影响

Contact Info

Product

Resources

About