Reliability assessment of groundwater monitoring networks at landfill sites

Yenigül, N. B.; Elfeki, Amro; Gehrels, J.C.; Akker, C. Van Den; Hensbergen, André T.; Dekking, F. M.

doi:10.1016/j.jhydrol.2004.10.017

Cited by 36 publications

(42 citation statements)

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“…Uncertainties that have great influence on reliability of the monitoring network are size and location of the possible contaminant leak and spatial variability of the hydrogeological charac-teristics, which make groundwater flow and contaminant paths hard to predict. Locations, depth and number of monitoring wells, chemical characteristics of contaminants, and sampling are also significant parameters that affect the reliability of a monitoring network [Buket et al 2005].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Landfill Leachate Pollution: Findings From a Monitoring Study at Municipal Waste Landfill

Vaverková¹,

Adamcová²

2015

J. Ecol. Eng.

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Section: Introductionmentioning

confidence: 99%

“…Minimum requirements are three down gradient wells and one up gradient well. The post closure monitoring time mentioned is 30 years while the position, number (more than the minimum requirement) and depth of the monitoring wells are proposed by the landfill owners or operators and by local authorities [Buket et al 2005].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Landfill Leachate Pollution: Findings From a Monitoring Study at Municipal Waste Landfill

Vaverková¹,

Adamcová²

2015

J. Ecol. Eng.

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“…As pointed out by Yenigül et al (2005), groundwater monitoring networks around landfills are usually insufficient to clearly demonstrate the occurrence of natural attenuation mechanisms. Such conclusions are substantiated by Christensen et al.…”

Section: Discussionmentioning

confidence: 99%

Investigations of natural attenuation in groundwater near a landfill and implications for landfill post-closure

et al. 2010

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The controlled landfill technology is now adopting passive attenuation techniques as an increasing number of landfill sites reach the post-closure phase. During the post-closure phase, landfill operators need to convince environmental authorities that landfills no longer pose a threat to health or the environment. The demonstration of such absence of risk should rely in particular on data collected during environmental monitoring in addition to modelling of possible future evolutions of environmental concentrations. One difficulty that is typically encountered in France is related to the fact that groundwater monitoring systems around landfills are often insufficiently detailed to provide conclusive evidence of natural attenuation mechanisms. This paper presents data on groundwater quality in the vicinity of an old landfill located in a complex aquifer system. While isotopic data suggest a signature of the landfill leachate in the groundwater in the vicinity of the landfill, chemical analyses do not show a strong influence, which could be indicative of natural attenuation mechanisms. However, the complexity of the groundwater system in this area is such that it cannot be excluded that emissions to the groundwater are not being overlooked. Implications of demonstrating natural attenuation during the landfill post-closure phase, with respect to groundwater monitoring, are discussed.Keywords: Landfill, Groundwater, Natural Attenuation, Isotopes, Monitoring 2 IntroductionThe "Controlled Landfill" technology, which emerged in the seventies but only became truly operational in France in the late eighties under the impetus of environmental regulations, is now adopting passive attenuation techniques, as an increasing number of landfill sites reach the post-closure phase. A typical example of such techniques is the use of methane oxidation covers for the passive treatment of residual greenhouse gas emissions (e.g. Scheutz et al., 2009). From an operator's perspective, if a landfill is no longer a source of income, it is highly desirable that it should rapidly cease to be a source of cost.Therefore during the post-closure phase, landfill operators need to convince environmental inspectors that landfills no longer pose a threat to health or the environment.The demonstration of such absence of risk should rely in particular on data collected from environmental monitoring networks in addition to modelling of possible future evolutions of environmental concentrations. Models for groundwater contaminant transport generally include conservative assumptions, due to the inherent complexity of mechanisms affecting the fate of contaminants in groundwater near landfills. Because conservative assumptions tend to maximise the estimation of risk, it would seem necessary in a context of post-closure risk assessments for decommissioning old landfills, to demonstrate by field data that attenuation mechanisms are at work in the subsurface. Such demonstration has been performed in the past by several researchers. In an extensive review of t...

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“…Therefore, an efficient wastewater treatment for landfill leachate must abate not only the organic matter load but also nitrogen and heavy metals, irrespective of the variations in volumetric flow and composition. According to the International Solid Waste Association, a landfill is the "engineered deposit of waste onto or into land in such a way that pollution or harm to the environment is prevented" [4].…”

Section: Introductionmentioning

confidence: 99%

Landfill leachate treatment by batch supercritical water oxidation

Cardona¹,

Buitrago²,

Acosta

2017

Cien.Ing.Neogranadina

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were measured in the reactor effluent samples and the combined effect of the studied factors was analyzed by means of the Analysis of Variance (ANOVA). Optimal operation conditions for TOC destruction were 400°C, 30 min and 100 % OE, being 500°C, 30 min and 100 % OE for TN destruction. Contrary to what has been reported in similar studies, the results suggest that it is possible to accomplish the simultaneous TOC and TN destruction in leachate wastewater by SCWO treatment at 400°C, 100 % OE and residence times longer than 30 min and without using a catalyst, either in batch or in a continuous process, as long as both the oxidant and the wastewater are mixed and heated together at the reaction temperature.Keywords: Landfill leachate, SCWO, TOC destruction, Total Nitrogen destruction. rEsumENEl tratamiento de lixiviados por medio de diferentes procesos fisicoquímicos y biológicos ha sido ampliamente estudiado. Sin embargo, ningún proceso logra las eficiencias de destrucción requeridas en cuanto a materia orgánica y nitrógeno, razón por la cual el tratamiento se realiza por medio de tecnologías combinadas. La oxidación en agua supercrítica o SCWO, proceso que se lleva a cabo a temperaturas y presiones superiores a las del punto crítico del agua en presencia de una fuente de oxígeno, se ha aplicado exitosamente al tratamiento de distintos tipos de aguas residuales de forma eficiente. Por lo tanto, este trabajo presenta un estudio experimental de la oxidación en agua supercrítica de lixiviados de relleno sanitario en un reactor batch, en el rango de temperatura de 400-500°C, tiempos de reacción de 15 a 30 minutos y excesos de oxígeno (OE) de 100 % a 300 %. Se midieron las eficiencias de destrucción de carbono orgánico total (COT) y nitrógeno total (NT), y se determinó el efecto combinado de los factores estudiados por medio del Análisis de Varianza (ANOVA). Las condiciones de operación óptimas para la destrucción de COT fueron 400°C, 30 min y 100 % OE, y 500°C, 30 min y 100 % OE para el NT. A diferencia de lo reportado en estudios similares, los resultados sugieren que es posible llevar a cabo la destrucción simultánea del COT y el NT en los lixiviados por medio de SCWO a 400°C, 100 % OE y tiempos de residencia de más de 30 min sin usar un catalizador, ya sea en un proceso batch o continuo, siempre y cuando tanto el oxidante como el agua residual se mezclen y se calienten juntos a la temperatura de reacción.Palabras clave: Lixiviados, SCWO, destrucción de COT, destrucción de nitrógeno total.

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Reliability assessment of groundwater monitoring networks at landfill sites

Cited by 36 publications

References 20 publications

Evaluation of Landfill Leachate Pollution: Findings From a Monitoring Study at Municipal Waste Landfill

Evaluation of Landfill Leachate Pollution: Findings From a Monitoring Study at Municipal Waste Landfill

Investigations of natural attenuation in groundwater near a landfill and implications for landfill post-closure

Landfill leachate treatment by batch supercritical water oxidation

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