Reactive transport models have proven abilities to simulate the quantity and quality of drainage from mine waste rock. Tracer experiments indicate the presence of fast and slow flow regimes in many heterogeneous waste-rock piles. Although multidomain models have been developed specifically for systems with such distinctive hydrodynamics, there have been limited applications of multidomain reactive transport models to simulate composite drainage chemistries from waste-rock piles to date. This work evaluated the ability of dual-domain multicomponent reactive transport models (DDMRTMs) to reproduce breakthrough curves of conservative (chloride) and reactive (molybdenum) solutes observed at a well-characterized experimental waste-rock pile at the Antamina Mine, Peru. We found that the DDMRTM simulations quantitatively matched eight-year-long records of conservative transport through the waste-rock pile when parameterized mainly with field-measured properties obtained from the site and limited calibration. The DDMRTM model also provided a reasonable match to field observations of the reactive solute. The limited calibrated parameters are physically realistic, corroborating the ability of these multidomain models to reproduce the complex reactive-transport processes governing polluted rock drainage from large-scale waste-rock piles.

Evaluating dual-domain models for upscaling multicomponent reactive transport in mine waste rock / D. Pedretti, B. Vriens, E.K. Skierszkan, P. Bajak, K.U. Mayer, R.D. Beckie. - In: JOURNAL OF CONTAMINANT HYDROLOGY. - ISSN 0169-7722. - 244(2022 Jan), pp. 103931.1-103931.11. [10.1016/j.jconhyd.2021.103931]

Evaluating dual-domain models for upscaling multicomponent reactive transport in mine waste rock

D. Pedretti
Primo
;
2022-01

Abstract

Reactive transport models have proven abilities to simulate the quantity and quality of drainage from mine waste rock. Tracer experiments indicate the presence of fast and slow flow regimes in many heterogeneous waste-rock piles. Although multidomain models have been developed specifically for systems with such distinctive hydrodynamics, there have been limited applications of multidomain reactive transport models to simulate composite drainage chemistries from waste-rock piles to date. This work evaluated the ability of dual-domain multicomponent reactive transport models (DDMRTMs) to reproduce breakthrough curves of conservative (chloride) and reactive (molybdenum) solutes observed at a well-characterized experimental waste-rock pile at the Antamina Mine, Peru. We found that the DDMRTM simulations quantitatively matched eight-year-long records of conservative transport through the waste-rock pile when parameterized mainly with field-measured properties obtained from the site and limited calibration. The DDMRTM model also provided a reasonable match to field observations of the reactive solute. The limited calibrated parameters are physically realistic, corroborating the ability of these multidomain models to reproduce the complex reactive-transport processes governing polluted rock drainage from large-scale waste-rock piles.
acid mine drainage; acid rock drainage; dual porosity; molybdenum; reactive transport modeling
Settore GEO/05 - Geologia Applicata
H20_RIA18MMASE_01 - Excellency Network Building for Comprehensive Research and Assessment of Geofluids (ENeRAG) - MASETTI, MARCO - H20_RIA - Horizon 2020_Research & Innovation Action/Innovation Action - 2018
23-nov-2021
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/906394
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