NDLI: Containment of groundwater pollution (methyl tertiary butyl ether and benzene) to protect a drinking-water production site in Belgium

Content Provider	Springer Nature Link
Author	Haest, Pieter Jan Lookman, Richard Keer, Ilse Patyn, Johan Bronders, Jan Joris, Marjan Bellon, Jan Smedt, Florimond
Copyright Year	2010
Abstract	The subsurface migration of methyl tertiary butyl ether (MTBE) and benzene towards a drinking-water production site in Belgium was monitored for 9 years. A large gasoline spill at a nearby fuel station had caused a 500-m long and 50-m-wide pollution plume of MTBE (10−30 mg/L) and benzene (2−10 mg/L). In order to prevent any intrusion of pollutants into the drinking-water supply, a conceptual model was used to design a pump-and-treat system that intercepted the gasoline-contaminated groundwater emanating from the spill. The contaminated soil in the spill zone was excavated. A numerical mass transport model was developed to evaluate the ongoing plume containment. The model describes the subsurface MTBE migration and was regularly updated, based on groundwater monitoring data and the measured mass of MTBE extracted with the pump-and-treat system. With continued interception pumping, the MTBE plume can be remediated in 14 years. Without it, MTBE and benzene concentrations up to 600 μg/L could have reached the drinking-water production site and the plume would persist for 9 years longer. Source zone treatment combined with plume interception pumping is a suitable risk-based remediation strategy for the containment of MTBE and benzene groundwater pollution.La migration dans le sol et le sous sol de méthyltertiobutyléther ou Méthyl Tert-Butyl Ether (MTBE) et de benzène vers un site de production d'eau potable en Belgique a été monitorée pendant 9 années. Un important déversement d'essence qui s’est produit à une station de carburant située à proximité avait causé un panache de plus de 500 m de long et de 50 m de large de contamination de MTBE (10−30 mg/L) et de benzène (2−10 mg/L). Pour prévenir toute intrusion de polluants dans le système d’appovisionnement en eau potable, un modèle conceptuel a été utilisé pour concevoir un système de pompage suivi d’un traitement qui intercepte l'eau souterraine contaminée émanant du déversement accidentel. Le sol contaminé dans la zone de déversement a été excavé. Un modèle numérique de transport de masse a été développé pour évaluer l’évolution en temps réel du panache de pollution. Le modèle décrit la migration du MTBE en subsurface (sol et sous sol) et a été régulièrement mis à jour, avec les données acquises sur les mesures réalisées dans les eaux souterraines et les mesures réalisées sur les fluides pompés. Avec une interception en continu par pompage, le panache de pollution en MTBE a été éliminé en 14 années. Sans ce système, le MTBE et le benzène présents à des concentrations supérieures à 600 μg/L auraient pu atteindre le site de production d'eau potable et le panache aurait pu encore persister pendant 9 années de plus. Le traitement de la zone de pollution initiale en combinaison avec le pompage des fluides contaminés est une stratégie de remédiation basée sur une analyse de risque appropriée pour confiner la pollution en MTBE et en benzène de l’eau souterraineDurante 9 años se monitoreó la migración subsuperficial de metil ter-butil éter (MTBE) y benceno hacia un sitio de producción de agua potable en Bélgica. Un gran derrame de gasolina de una estación de combustibles cercana ha originado una pluma de contaminación de 500 m de longitud y 50 m de ancho de MTBE (10−30 mg/L) y benceno (2−10 mg/L). Se usó un modelo conceptual para diseñar un sistema de bombeo y tratamiento que interceptara el agua subterránea contaminada por gasolina emanada desde el derrame con el objeto de prevenir cualquier intrusión de contaminantes en el sitio de abastecimiento de agua potable, Se excavó el suelo contaminado en la zona del derrame. Se desarrolló un modelo numérico de transporte de masa para evaluar el proceso de contención de la pluma, El modelo describe la migración subsuperficial del MTBE y fue regularmente puesto al día, basado en datos de monitoreo del agua subterránea y en las masas medidas de MTBE extraídas con el sistema de bombeo y tratamiento. Con la intercepción del bombeo continuado, la pluma de MTBE puede ser remediada en 14 años. Sin él, concentraciones de MTBE y de benceno de hasta 600 μg/L podrían haber alcanzado el sitio de producción de agua potable y la pluma podría persistir por un lapso adicional de 9 años El tratamiento de la zona fuente combinado con el bombeo de la intercepción de la pluma es una estrategia de remediación apropiado sobre la base del riesgo para la contención de la contaminación de agua subterránea por MTBE y benceno.基于九年的地下水甲基叔丁基醚(MTBE)和苯的监测工作, 比利时某饮用水源地附近加油站的石油泄漏形成了一个长500米、宽50米的污染晕, MTBE和苯的浓度分别为10−30 mg/L和2−10 mg/L。为了防止饮用水水源地受到污染, 本文建立了一个概念模型, 用于建设一套抽出-处理系统以截取受石油污染的地下水。泄漏区被污染的土壤已经被挖空。建立了一个溶质运移数值模型以评估污染晕控制效果。模型描述了地下水中MTBE的迁移, 并基于地下水监测数据和开采-处理系统中截取到的MTBE的含量加以定期更新。如果进行持续的拦截抽水, MTBE晕造成的水质污染会在14年内修复。反之, MTBE和苯最终会以600 μg/L的浓度扩散至水源地, 且污染晕会持续9年以上。为防止MTBE和苯的地下水污染, 污染源区处理与污染晕控制相结合是一种适用的基于规避风险的地下水污染修复策略。A migração subsuperficial do éter metil-terciário butílico (MTBE) e do benzeno em direcção a um local de produção de água de abastecimento na Bélgica foi monitorizada durante 9 anos. Um grande derrame de gasolina numa estação de serviço próxima causou uma pluma de poluição com 500 m de comprimento e 50 m de largura de MTBE (10−30 mg/L) e benzeno (2−10 mg/L). De modo a prevenir qualquer intrusão de poluentes no abastecimento de água potável, foi usado um modelo conceptual para definir um sistema de bombagem e tratamento que intersectou a água subterrânea contaminada com gasolina emanada do derrame. O solo contaminado na zona do derrame foi escavado. Um modelo numérico de transporte de massa foi desenvolvido para avaliar os avanços na contenção da pluma. O modelo descreve a migração subsuperficial de MTBE e foi regularmente actualizado, baseado na monitorização da água subterrânea e na medição da massa de MTBE extraída através do método de bombeamento e tratamento. Com a contínua intersecção por bombeamento, a pluma de MTBE pode ser remediada em 14 anos. Sem essa acção, concentrações de MTBE e de benzeno até 600 μg/L poderiam ser atingidas no local de produção de águas de abastecimento e a pluma poderia persistir por mais 9 anos. O tratamento na origem, combinado com a intercepção da pluma por bombagem, é uma estratégia de remediação apropriada ao risco para a contenção de contaminação de água subterrânea com MTBE e benzeno.
Starting Page	1917
Ending Page	1925
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	8
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2010-09-28
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Contamination Groundwater protection Numerical modeling Pump-and-treat Belgium Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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