Containment and attenuating layers: An affordable strategy that preserves soil and water from landfill pollution

Regadío, Mercedes; Ruiz, A.; Rodríguez-Rastrero, Manuel; Cuevas, Jaime

doi:10.1016/j.wasman.2015.08.014

Cited by 37 publications

(16 citation statements)

References 76 publications

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“…Indeed, leachates are not representative of degradation state of the whole massif, because within a dump, water flow that percolates through the massif is not uniform due to the existence of preferential flow paths. Thereby, leachate characterization gives a global information but can generate errors on estimation of waste massif stability (Regadío, Ruiz, Rodríguez‐Rastrero, & Cuevas, ). Applied unconventional operation may speed up highly waste degradation, by favoring rapid development of methanogenic conditions. Furthermore, the later studies have showed that even leachates from young landfills can be not biodegradable because of the recirculation practice of the leachate produced in the mass of waste (Kulikowska & Klimiuk, ).…”

Section: Resultsmentioning

confidence: 99%

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Rouidi

Maurício

Boukhrissa

et al. 2019

Water Environment Research

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The feasibility of the electro-Fenton (EF) process to improve the biodegradability of Algerian leachates was examined, in order to prepare this kind of flux for conventional biological treatment. This work also included, for the first time in Algeria, the control and monitorization of a landfill-the "Hamici" landfill. Several physicochemical parameters were determined allowing its classification into an intermediate degradation phase, namely considering their alkaline pH (8.7), high ammonium concentration (3,120 mg/L), low content in heavy metals, and biodegradability (BOD 5 / COD = 0.22). The effects of important parameters such as current intensity, treatment time, and temperature on COD removal have been studied and optimized by using response surface analysis of a central composite design, where 91.1% of COD was removed with a treatment time of 285 min, a current intensity of 3 A, and a temperature of 20°C. A biodegradability test, which was performed on a solution electrolyzed with 120 min, 2 A, and 20°C, allowed to improve the leachates biodegradability from 0.2 to 0.42, with a removal rate of COD and TOC of 53.35% and 34.5%, respectively. However, the current efficiency declined from 137% to 76.6% when the current intensity was rise from 0.5 to 2 A. These results showed the relevance of EF process applied on raw intermediate leachates and its possible benefit in the Algiers leachates treatment processes. Thus, it was concluded that biological treatment can be combined with EF process for optimal mineralization of leachates with clear advantages in this studied location. • Practitioner points• Characterization and treatment of leachates by electro-Fenton (EF) process were carried out. • The leachates are intermediate type and therefore biologically recalcitrant. • The operating parameter for EF process were modeled and optimized by the central composite design. • Current intensity of 2 A reduces COD and TOC of 53.35% and 34.5%, respectively. • The ratio BOD 5 /COD increased from 0.2 to 0.42 after 120 min of electrolysis time.

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Section: Resultsmentioning

confidence: 99%

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Rouidi

Maurício

Boukhrissa

et al. 2019

Water Environment Research

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“…To protect the environment surrounding waste landfill sites, especially nuclear waste landfill sites, the landfill site needs to be isolated from its surroundings by a barrier made of low-permeability materials [1]. Expansive clays such as montmorillonite and kaolinite are materials commonly used to make barriers because of their low permeability coefficient [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Permeability Evaluation of Clay-quartz Mixtures Based on Low-Field NMR and Fractal Analysis

Sha

Wang

2020

Applied Sciences

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Nuclear magnetic resonance (NMR) technology has been widely used for predicting permeability coefficients of porous medium, such as shales, sandstones, and coals. However, there have been limited studies on the prediction model of clay-quartz mixtures based on NMR technology. In this study, evaporation tests at 40 °C and NMR tests were simultaneously performed on eight clay-quartz mixtures with different mineral compositions. The results show that during the evaporation process, the decay rate of T2 total signal amplitudes was constant at first, and then decreased to 0 after a period of time. Based on the decay rate, the evaporation process was divided into two stages: the constant rate stage and the falling rate stage. Based on the two stages, the T2 cut-offs of eight mixtures were determined. The water in the mixture was divided into two parts by the T2 cut-off: the free water and the bound water. The prediction model of permeability coefficients of clay-quartz mixtures was established based on the Timur-Coates model. In order to simplify the process of predicting the permeability coefficient, fractal analysis was used to develop the relationship between the T2 cut-off and fractal dimension of the T2 spectrum of saturated mixture. A simplified method for predicting permeability coefficients of clay-quartz mixtures based on NMR technology without centrifugal and evaporation experiments was also proposed.

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“…Previous studies have shown the suitability of natural clays as natural attenuation barriers to contaminants in landfill liners (Regadío et al 2012;Thornton et al, 2001). This is largely due to biogeochemical interactions which occur between clay minerals and contaminants in leachate (Regadío et al, 2015). While this concept offers a promising way to increase the environmental security of landfill sites, it has not been widely implemented in current liner design, and there is also a need to ensure it is environmentally sustainable.…”

Section: Introductionmentioning

confidence: 99%

High Attenuation Recycled Materials as landfill liners (the HARM project) – A new concept for improved landfill liner design

Regadío¹,

Cargill²,

Black³

et al. 2020

Preprint

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A new approach in landfill liner design which combines hydraulic containment of leachate with contaminant attenuation to improve the performance of these environmental control systems at landfills is described. The idea is to re-use readily available industrial waste residues (construction and biomass waste) as additives for natural clay liners, wherein the additives have specific properties which enhance the attenuation of contaminants by the mixture. The aim is to (1) evaluate the contaminant attenuation capacity of these mixtures, (2) develop design guidelines to construct liners for waste containment systems and similar applications, and (3) interpret their performance using numerical modelling. This is evaluated in permeation studies using a geotechnical centrifuge, which enables the performance of liner compositions to be tested for representive time-scales (100 years), pressures and temperatures at realistic experimental time-scales of days-weeks in the laboratory. The permeation experiments include liner compositions flushed with leachate to deduce contaminant transport and attenuation mechanisms, followed by rainwater to assess the potential for release of attenuated contaminants. This experimental methodology is illustrated with depth profiles from permeation studies conducted on different clay-additive compositions. The concept will be applicable for liner design at other waste disposal facilities and is a timely improvement which addresses the problem of managing large quantities of industrial residues. Instead of disposal these can be recycled as an additive in host clay to construct these liners, thus conserving natural resources (clay) and reducing construction costs. It also provides an effective and more environmentally sustainable basis to reduce risks from leachate leakage.

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Containment and attenuating layers: An affordable strategy that preserves soil and water from landfill pollution

Cited by 37 publications

References 76 publications

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Characterization and treatment of landfill leachates by electro‐Fenton process: A case study in Algeria

Permeability Evaluation of Clay-quartz Mixtures Based on Low-Field NMR and Fractal Analysis

High Attenuation Recycled Materials as landfill liners (the HARM project) – A new concept for improved landfill liner design

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