Identification of a reactive degradation zone at a landfill leachate plume fringe using high resolution sampling and incubation techniques

Tuxen, Nina; Albrechtsen, Hans‐Jørgen; Bjerg, Poul Løgstrup

doi:10.1016/j.jconhyd.2006.01.004

Cited by 72 publications

(67 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Degradation was lowest in samples with an additional 0.02mg O 2 g -1 dw ( Figure 3C). Degradation of mecoprop, with up to 53% mineralisation at high oxygen concentrations and 32% at low oxygen concentrations, was previously observed in laboratory experiments with point source-contaminated aquifer materials (Tuxen et al 2006b). However, the pesticide concentrations investigated in that study were much higher (45 µg L -1 ) than in our study.…”

Section: Mineralisation Potential In Groundwater and Sediment Experimmentioning

confidence: 54%

“…Before adding th water samples all bottles with chalk sediment were autoclaved three times at 1.5 bars and 120°C to ensure that active bacteria present in the bottles originated from the groundwater and not from the incubations were set up with 40g wet aquifer material (sediment and pore water) and 3.5mL groundwater in 50mL sterilized infusion glass bottles with butyl rubber stoppers in an anaerobic glove box (Coy Laboratory Products, Inc.) (Tuxen et al, 2006b). 14 Cherbicides were added separately to the microcosm, to a final concentration of 1µg L -1 of each pesticide.…”

Section: Mineralisation Potential In Groundwatermentioning

confidence: 99%

“…One approach for enhancing biodegradation in soil is the addition of electron acceptors, such as oxygen or nitrate, in order to stimulate indigenous microbial populations (Kanissery and Sims, 2011). Adding oxygen can enhance the aerobic biodegradation of phenoxy acids at high concentrations (45 µg L -1 ) in anaerobic aquifer materials emanating from phenoxy acid-contaminated point sources (Tuxen et al, 2006b). We built upon the work of Tuxen et al (2006a) and investigated the potential aerobic degradation of herbicides in aquifer materials at low concentrations (1 µg L -1 ) near to an operating drinking water abstraction field.…”

Section: Introductionmentioning

confidence: 99%

“…The three herbicides were selected in order to relate the experiments to the recent detection of bentazone and dichlorprop at the Nybølle drinking water abstraction well field, to facilitate a comparison with previous experimental work with mecoprop (Tuxen et al, 2006b) and to improve knowledge of degradation in bentazone, a herbicide detected frequently worldwide and in Denmark.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stimulation of aerobic degradation of bentazone, mecoprop and dichlorprop by oxygen addition to aquifer sediment

Levi

Hybel

Bjerg

et al. 2014

Science of The Total Environment

View full text Add to dashboard Cite

Section: Mineralisation Potential In Groundwater and Sediment Experimmentioning

confidence: 54%

Section: Mineralisation Potential In Groundwatermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stimulation of aerobic degradation of bentazone, mecoprop and dichlorprop by oxygen addition to aquifer sediment

Levi

Hybel

Bjerg

et al. 2014

Science of The Total Environment

View full text Add to dashboard Cite

“…van Vossen et al, 2009;Tuxen et al, 2006;Baun et al, 2003;Christensen et al, 2000, Christensen et al, 1994.…”

Section: Introductionunclassified

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

et al. 2010

View full text Add to dashboard Cite

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...

show abstract

Measurements and models of reactive transport in geological media

Berkowitz

Dror

Hansen

et al. 2016

Reviews of Geophysics

View full text Add to dashboard Cite

Reactive chemical transport plays a key role in geological media across scales, from pore scale to aquifer scale. Systems can be altered by changes in solution chemistry and a wide variety of chemical transformations, including precipitation/dissolution reactions that cause feedbacks that directly affect the flow and transport regime. The combination of these processes with advective‐dispersive‐diffusive transport in heterogeneous media leads to a rich spectrum of complex dynamics. The principal challenge in modeling reactive transport is to account for the subtle effects of fluctuations in the flow field and species concentrations; spatial or temporal averaging generally suppresses these effects. Moreover, it is critical to ground model conceptualizations and test model outputs against laboratory experiments and field measurements. This review emphasizes the integration of these aspects, considering carefully designed and controlled experiments at both laboratory and field scales, in the context of development and solution of reactive transport models based on continuum‐scale and particle tracking approaches. We first discuss laboratory experiments and field measurements that define the scope of the phenomena and provide data for model comparison. We continue by surveying models involving advection‐dispersion‐reaction equation and continuous time random walk formulations. The integration of measurements and models is then examined, considering a series of case studies in different frameworks. We delineate the underlying assumptions, and strengths and weaknesses, of these analyses, and the role of probabilistic effects. We also show the key importance of quantifying the spreading and mixing of reactive species, recognizing the role of small‐scale physical and chemical fluctuations that control the initiation of reactions.

show abstract

Identification of a reactive degradation zone at a landfill leachate plume fringe using high resolution sampling and incubation techniques

Cited by 72 publications

References 36 publications

Stimulation of aerobic degradation of bentazone, mecoprop and dichlorprop by oxygen addition to aquifer sediment

Stimulation of aerobic degradation of bentazone, mecoprop and dichlorprop by oxygen addition to aquifer sediment

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

Measurements and models of reactive transport in geological media

Contact Info

Product

Resources

About