Landfilling: Hydrology

Kjeldsen, Peter; Beaven, R.P.

doi:10.1002/9780470666883.ch46

Cited by 3 publications

(5 citation statements)

References 36 publications

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“…HYDRUS, MODFLOW-SURFACT, COMSOL Multiphysics, etc.) to model transport in MSW (Audebert et al, 2016a, 2016b; Beaven et al, 2011; Fellner and Brunner, 2010; Haydar and Khire, 2005, 2007; Khire and Kaushik, 2012; Khire and Mukherjee, 2007; Khire and Saravanathiiban, 2010; Kjeldsen and Beaven, 2011; Olivier et al, 2009; Saquing et al, 2012; Slimani et al, 2017; Tinet et al, 2011a, 2011b). Amongst commercial codes, HYDRUS has been a recurrent choice for modelling flow through MSW (Fellner and Brunner, 2010; Haydar and Khire, 2005, 2007; Khire and Kaushik, 2012; Khire and Mukherjee, 2007; Reddy et al, 2013).…”

Section: Modelling Of Leachate Flow and Solute Transportmentioning

confidence: 99%

“…A very popular mechanistic approach to modelling of flow has been to apply different formulations of the Richards’ equation, dividing the domain into two homogeneous and isotropic overlapping continua (e.g. mobile and immobile regions of liquid) in an attempt to capture the complex pore space of MSW (Beaven et al, 2011; Di Bella et al, 2012; Di Trapani et al, 2015; Fellner and Brunner, 2010; Han et al, 2011; Kjeldsen and Beaven, 2011; McDougall, 2011; Slimani et al, 2017; Statom et al, 2006; Tinet et al, 2011b). For instance, vertical flow in MSW samples at the pilot-scale has been investigated by Woodman et al (2015) – interestingly, in their study lithium did not behave conservatively as a tracer.…”

Section: Modelling Of Leachate Flow and Solute Transportmentioning

confidence: 99%

“…their shapes, sizes and varying biodegradation rates) and numerous coupled processes on the flow regime. In this paper, heterogeneity is referred to as the variability in the properties of MSW, while preferential flow is defined as the phenomenon where the leachate takes the path of least resistance through the waste mass and channels through the larger pores (Beaven et al, 2011;Dixon and Langer, 2006;Dixon et al, 2008aDixon et al, , 2008bKjeldsen and Beaven, 2011;Powrie and Beaven, 1999;Woodman, 2007).…”

Section: Introductionmentioning

confidence: 99%

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The case for examining fluid flow in municipal solid waste at the pore-scale – A review

2019

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23In this paper, we discuss recent efforts from the last 20 years to describe transport in municipal 24 solid waste (MSW). We first discuss emerging themes in the field to draw the reader's attention to 25 a series of significant challenges. We then examine contributions regarding the modelling of 26 leachate flow to study transport via mechanistic and stochastic approaches, at a variety of scales. 27Since MSW is a multiphase, biogeochemically active porous medium, and with the aim of 28 providing a picture of transport phenomena in a wider context, we then discuss a selection of 29 studies on leachate flow incorporating some of the complex landfill processes (e.g. biodegradation, 30 settlement). It is clear from the literature survey that our understanding of transport phenomena 31 exhibited by landfilled waste is far from complete. Attempts to model transport have largely 32 consisted of applying representative elementary-scale models (the smallest volume which can be 33 considered representative of the entire waste mass). Due to our limited understanding of fluid flow 34 through landfilled waste, and the influence of simultaneously occurring biogeomechanical 35 processes within the waste mass, elementary-scale models have been unable to fully describe the 36 flow behaviour of MSW. Pore-scale modelling and experimental studies have proven to be a 37 promising approach to study fluid flow through complex porous media. Here, we suggest that pore-38 scale modelling and experimental work may provide valuable insights into transport phenomena 39 exhibited by MSW, which could then be used to revise elementary-scale models for improved 40 representation of field-scale problems. 41 42 43 44 4 KEYWORDS 45 municipal solid waste; modelling leachate transport; landfill; waste heterogeneity; preferential 46 flow. 47 6 2000; Rosqvist et al. , 2005) with some studies focusing on conceptual models of the pore structure 89 of MSW at the elementary scale Woodman et al., , 2015 Woodman et al., 90 2013). However, to date, our understanding of the flow of leachate, biogas and the impact of other 91 simultaneously occurring biogeochemical processes on flow and transport is incomplete, 92 especially at the pore-scale. This is particularly important to note since it is these pore-scale 93 processes, with the possibility of field-scale processes dominating particular facets at particular 94 times, that ultimately govern the overall behaviour in reactive porous media (Blunt, 2001; Blunt 95 et al., 2013;Menke et al., 2017;Xiong, 2015;Xiong et al., 2016). It is likely that processes average 96 over a wide range of different scales, which would explain the success of the widely used empirical 97 landfill gas models. The real challenge lies in the integration of modelling processes at all the 98 scales and understanding how averaging works. It is clear that one of the most difficult aspects to 99 model is the inherent heterogeneity of the waste mass, and the impact of different waste 100 components (e.g. their shapes, sizes and varyi...

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Section: Modelling Of Leachate Flow and Solute Transportmentioning

confidence: 99%

Section: Modelling Of Leachate Flow and Solute Transportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The case for examining fluid flow in municipal solid waste at the pore-scale – A review

2019

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“…Landfill leachate quantification is usually modelled based on water balance principles by estimating the amounts of water percolating into the landfill and subtracting the amounts of water consumed by degradation or lost by evaporation (Kjeldsen and Beaven, 2011). In recent decades, different mathematical models have been developed to simulate the generation of leachate in landfills.…”

Section: Introductionmentioning

confidence: 99%

Leachate generation from landfill in a semi-arid climate: A qualitative and quantitative study from Sousse, Tunisia

2017

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Despite initiatives for enhanced recycling and waste utilization, landfill still represents the dominant disposal path for municipal solid waste (MSW). The environmental impacts of landfills depend on several factors, including waste composition, technical barriers, landfill operation and climatic conditions. A profound evaluation of all factors and their impact is necessary in order to evaluate the environmental hazards emanating from landfills. The present paper investigates a sanitary landfill located in a semi-arid climate (Tunisia) and highlights major differences in quantitative and qualitative leachate characteristics compared to landfills situated in moderate climates. Besides the qualitative analysis of leachate samples, a quantitative analysis including the simulation of leachate generation (using the HELP model) has been conducted. The results of the analysis indicate a high load of salts (Cl, Na, inorganic nitrogen) in the leachate compared to other landfills. Furthermore the simulations with HELP model highlight that a major part of the leachate generated originates form the water content of waste.

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“…The expected LFG emissions from the leach-ate at real scale landfill are significantly lower than in laboratory conditions, mainly because of channel flow through the waste which occurs at high speed and results in wetting of waste to a much lesser extent. Desired leachate trajectory is caused by differences in the local hydraulic conductivity of the waste and daily coverings that are used [11]. By exploring the impact of the flow of water through the waste of the same characteristics, but different sizes, it is shown that under laboratory conditions about 40% of the pore water participates in the transport of solutes, while the proportion is less than 0.2% of the observed real scale landfill [12].…”

Section: Introductionmentioning

confidence: 99%

Impact assessment of concentrate recirculation on the landfill gas production

Dzolev¹,

Vujic

2016

Therm sci

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This paper explores the impact of concentrate re-circulation, as a product of leachate treated by reverse osmosis plant, on the production of landfill gas at the realscale landfill for municipal solid waste. In an effort to come up with results, experimental measurements were carried out at the landfill in city of Bijeljina, Republic of Srpska, Bosnia and Herzegovina. All performed measurements were divided into three groups. The aims of two groups of measurement were to determine landfill gas and methane yield from concentrate, and leachate in laboratory conditions (1 st group), and to find out concentrations of oxidizing matters (chemical and biochemical oxygen demand) present in leachate and concentrate at different points of treatment as well as its variability over the time (2 nd group), which could be used to calculate the potential of landfill gas and methane generation from concentrate by re-circulation, theoretically. The 3 rd group of measurements, carried out in parallel, has goal to determine the quality and quantity of the collected landfill gas at wells throughout the landfill. The results of analysis carried out in this experimental research show the clear evidence of concentrate re-circulation impact on methane production by increasing the landfill gas flow, as well as its concentration within the landfill gas composition, at the nearby well. Although results indicated relatively high impact of concentrate re-circulation on landfill gas production, comparing to its theoretical potential, the influence on the landfill at whole, is negligible, due to relatively low volumes in re-circulation with respect to its size and objectively low potential given by organic matter present in concentrate.

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Landfilling: Hydrology

Cited by 3 publications

References 36 publications

The case for examining fluid flow in municipal solid waste at the pore-scale – A review

The case for examining fluid flow in municipal solid waste at the pore-scale – A review

Leachate generation from landfill in a semi-arid climate: A qualitative and quantitative study from Sousse, Tunisia

Impact assessment of concentrate recirculation on the landfill gas production

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