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Title of Journal: Hydrogeol J

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Abbravation: Hydrogeology Journal

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Springer-Verlag

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DOI

10.1016/0030-4018(78)90129-3

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1435-0157

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Remediation scenarios for selenium contamination

Authors: Tom Myers
Publish Date: 2013/01/25
Volume: 21, Issue: 3, Pages: 655-671
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Abstract

Extensive phosphate mining in the Blackfoot watershed of Idaho USA has substantially increased the selenium Se concentration in the river during both snowmelt and baseflow when groundwater discharge dominates Phosphate mines create a linkage between Seladen shale that occurs in the Phosphoria Formation and the underlying regional Wells Formation aquifer Using a reconnaissancelevel transport model mines in the watershed were prioritized for remediation and for comparing the results of simulations of remediation scenarios with a baseline of no remediation for which Se concentration in the river will exceed the aquatic standard along an extensive length An accurate simulation of recharge distribution around the watershed and simulated flux to the river is essential Remediation of mines north of the river will substantially decrease the size of the Se plume although significant Se will continue to discharge to the river Similarly remediation of three mines south of the river would decrease the Se discharge to the river but allow substantial amounts to remain stored in the groundwater north and far south of the river A lack of calibration data is not a reason to forgo remediation but rather ongoing data collection can be used to finetune plans as they are implementedL’exploitation minière extensive de phosphate sur le bassin versant de Blackfoot dans l’Idaho EtatsUnis a considérablement augmenté la concentration en sélénium Se dans la rivière à la fois durant la fonte des neiges et en débit de base lorsque la décharge de nappe domine Les mines de phosphate créent une relation entre les schistes séléniteux qui se trouvent dans la Phosphoria Formation et l’aquifère régional sousjacent de la Well Formation Utilisant un modèle de déplacement de l’eau souterraine avec reconnaissance de niveau on a donné la priorité aux mines du bassin pour la décontamination et pour la comparaison des résultats de scénarios de décontamination avec un référentiel sans dépollution cas dans lequel la concentration en sélénium dans la rivière excède la norme sur une longue distance Une simulation exacte de la distribution de la recharge sur le bassin versant et du flux simulé vers la rivière est essentielle La décontamination des mines au Nord de la rivière va considérablement réduire la taille du panache de sélénium bien que le Se en quantités significatives va continuer à se décharger dans la rivière De la même façon la décontamination de trois mines au Sud de la rivière diminuerait la décharge de Se dans la rivière mais permettrait à des quantités considérables de Se de rester emmagasinées dans l’eau souterraine au Nord et à l’extrême Sud de la rivière Un manque de données d’étalonnage n’est pas une raison pour renoncer à décontaminer et la collecte de données en cours pourra être utilisée pour affiner les projets lors de leur mise en œuvreLa minería extensiva de fosfatos en la cuenca de Blackfoot en Idaho EEUU ha incrementado sustancialmente la concentración de selenio Se en el río tanto durante el deshielo y como en el flujo de base cuando domina la descarga de agua subterránea Las minas de fosfato crean un nexo entre el carga de Se de los esquistos que ocurre en la Formación Phosphoria y el acuífero regional subyacente de la Formación Wells Usando un modelo de transporte a nivel de reconocimiento se priorizaron las minas en la cuenca para la remediación y para la comparación de los resultados de las simulaciones de escenarios de remediación con una línea de base de no remediación para lo cual la concentración de Se en el río excede la norma acuática a lo largo de una extensa longitud Resulta esencial una simulación precisa de la distribución de la recarga alrededor de la cuenca y del flujo simulado hacia el río La remediación de las minas al norte del río decrece sustancialmente el tamaño de la pluma de Se aunque una cantidad significativa de Se continuará descargando hacia el río De forma similar la remediación de tres minas del sur del río disminuirá la descarga de Se al río pero permitiría que permaneciera cantidades sustanciales almacenadas en el agua subterránea al norte y bien lejos al sur del río Una falta de datos de calibración no es razón para abstenerse de la remediación pero más bien la continuidad en recolección de datos puede ser usada para planes de ajustes detallados a medida que son implementados美国爱达荷州Blackfoot流域大量的磷酸盐矿开采已经大幅度提高了河流中硒的浓度 无论在融雪水多还是在地下水排泄比较强烈的基流主导季节都是如此。磷酸盐矿使磷矿群中的含硒页岩和底层的区域性的水井群含水层保持着联系。利用初勘级的输运模型对流域的矿井进行修复排队以及基于修复方案的模拟结果的比较进行排队作为参考基准的是没有进行修复的河流其在其很大长度范围内硒的含量都是超标的。准确模拟出流域内补给位置分布及其流入河流的通量是必不可少的。对河流以北的矿井进行修复将大大减小硒晕的规模不过仍会有大量的硒持续流向河流。同样河流以南三个矿井的修复将会减少流向河流的硒的量但仍会有大量的硒继续存在于河流以北和河流以南较远处的地下水中。不能因为缺少校准数据而放弃修复而应该在修复进行期间继续收集数据用来调整修复方案。A mineração extensiva de fosfatos na bacia de Blackfoot em Idaho EUA incrementou substancialmente a concentração de selénio Se no rio em duas situações durante a fusão da neve e quando a descarga do fluxo de base de água subterrânea é dominante As minas de fosfato criam uma ligação entre os xistos com Se que ocorrem na Formação Phosphoria e o aquífero regional subjacente da Formação Wells Usando um modelo de transporte a nível de reconhecimento as minas da bacia foram priorizadas para remediação e para comparação dos resultados das simulações dos cenários de remediação com uma linha de base de não remediação para a qual a concentração de Se no rio excederá o padrão aquático ao longo de uma extensão significativa É essencial uma simulação acurada da distribuição da recarga na bacia e da simulação de fluxo para o rio A remediação das minas a norte do rio fará decrescer substancialmente a dimensão da pluma apesar de uma quantidade significativa de Se continuar a descarregar para o rio Similarmente a remediação de três minas a sul do rio fará decrescer a descarga de Se para o rio mas permitirá que quantidades substanciais se mantenham armazenadas na água subterrânea a norte e no extremo sul em relação ao rio Uma falta de calibração não é razão para renunciar à remediação mas antes para considerar a recolha constante de dados a fim de serem usados para afinar os planos à medida que forem sendo implementados


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  6. Transport and deposition of suspended particles in saturated porous media: hydrodynamic effect
  7. Model of hydrological behaviour of the anthropized semiarid wetland of Las Tablas de Daimiel National Park (Spain) based on surface water–groundwater interactions
  8. Determination of hydraulic parameters of an unconfined alluvial aquifer by the floodwave-response technique
  9. A theoretical analysis of basin-scale groundwater temperature distribution
  10. Numerical modeling of stress-permeability coupling in rough fractures
  11. Using Hydrogeochemical Methods To Evaluate Complex Quaternary Subsurface Stratigraphy Block Island, Rhode Island, USA
  12. Karst groundwater: a challenge for new resources
  13. Evaluation of retention properties of a semi-synthetic fractured block from modelling at performance assessment time scales (Äspö Hard Rock Laboratory, Sweden)
  14. Groundwater management by riverbank filtration and an infiltration channel: the case of Obrenovac, Serbia
  15. Interactions between groundwater and surface water: the state of the science
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  17. Groundwater recharge: an overview of processes and challenges
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