Effect of the leachate head on the key pollutant indicator in a municipal solid waste landfill barrier system

Shu, Shi; Zhu, Wei; Wang, Shengwei; Fan, Xihui; Wu, Sheng; Shi, Jianyong; Song, Jie

doi:10.1016/j.jenvman.2019.03.065

Cited by 20 publications

(18 citation statements)

References 21 publications

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“…e FEM program Dtransu 2D, designed for calculating fluid flow with mass transport via coupled solute advectiondispersion, was employed [9]. is program has been verified in numerous applications pertaining to seepage flow and contaminant migration [4,5,11,12]. e equation governing solute transport and dispersion, taking saturatedunsaturated fluid flow into account, is as follows [9]:…”

Section: Numerical Modelmentioning

confidence: 99%

“…However, pollutants in the dredged sludge, such as heavy metals, cannot be removed through solidification/stabilization [2,3]. ese heavy metal pollutants may migrate to underground environments via mechanisms such as convection, diffusion, dispersion, and adsorption, especially in simple landfills common in China [4,5]. ese landfills generally do not have either a bottom liner system or a closure cover system, and their antiseepage properties are dependent on the low permeability of natural clay layers [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Sun

Shu

2020

Advances in Civil Engineering

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Despite the extensive attention paid to the transport of heavy metals in sludge landfills, the processes of transporting these pollutants from a landfill to the underground environment are quite complicated and subject to significant uncertainty. In this study, the transport of typical heavy metal pollutants in a sludge landfill through saturated and unsaturated soil zones during rainfall was investigated via numerical modeling. The objectives of the study are to evaluate the heavy metal pollution risk from a sludge landfill under rainfall infiltration conditions and to propose several management suggestions. The results indicate that, during rainfall, heavy metal concentrations at the top of the unsaturated sludge layer decrease rapidly, but they decrease more gradually at the bottom of the layer. The maximum concentration appears in vertical distribution and decreases gradually through the saturated zone. Nickel is the first heavy metal pollutant to break through the low-permeability natural silt barrier. The transport parameters not only influence the simulated time for heavy metal pollutants to break through the silt layer and cause underground environmental pollution but also affect the extent to which the heavy metal pollutants in pore water exceed the guidelines. On the basis of these results, for dredged sludge with heavy metal concentrations significantly exceeding the standard, the concentration of heavy metals in pore water should be reduced before the sludge is landfilled, and a covering layer should be established on the sludge surface to control rainfall infiltration.

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Sun

Shu

2020

Advances in Civil Engineering

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“…Four factors were extracted to represent the main factors for groundwater quality, and to identify the different pollution sources. BOD 5 /COD Mn is commonly employed as an indicator of the age of MSW landfill sites [28,29]. According to the environmental assessment report of 1995, the ratio of BOD 5 /COD Mn for leachate (512 mg/L and 1938 mg/L, respectively) and the groundwater of the 2# monitoring well (0.9 mg/L and 3.4 mg/L, respectively) was 0.264 and 0.265, respectively, which indicated that the leachate had a low biodegradability in the anaerobic phase of the environment [30].…”

Section: Factor Analysismentioning

confidence: 99%

Assessment of Shallow Groundwater Contamination Resulting from a Municipal Solid Waste Landfill—A Case Study in Lianyungang, China

Chen

Sun

et al. 2019

Water

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Groundwater contaminations based on the release and transportation of leachate from municipal solid waste (MSW) landfills are a potential hazard to the ecosystem and its inhabitants. In this study, nine chemical compositions of groundwater quality were collected and analysed from 16 monitoring wells and two ponds around the Diaoyushan MSW landfill in the north of Jiangsu Province, China. Multiple analyses were performed to assess the redox conditions and the groundwater environment. It was indicated that the landfill was in a low and stable biodegradability phase, and the most influential phase was the initial stage of the landfill site; the leachate leakage was the principal pollution source (49.18%) for the local groundwater environment. Artificial drainage of Dongdasha village expanded the contaminant plume scopes and deteriorated water quality further. The polluted groundwater area was provided with high concentrations of total hardness, Cl−, SO42−, total dissolved solids (TDS) and Pb.

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“…However, MSW landfill leachate contains a wide variety of pollutants at very different concentrations (Emenike et al, 2012; Rapti-Caputo and Vaccaro, 2006; Shu et al, 2019b), and competitive adsorption will inevitably occur as these pollutants are transported through a CCL. Previous studies have reported competitive adsorption of multiple pollutants on clay materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of competitive adsorption on the transport of multiple pollutants through a compacted clay liner

et al. 2020

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Leachate transport through municipal solid waste (MSW) landfill liners can be slowed considerably by adsorption. MSW landfill leachate contains a large variety of pollutants at very different concentrations, and there will be competitive adsorption as these pollutants are transported through the landfill’s compacted clay liner (CCL). In this study, we used batch adsorption tests and geotechnical centrifuge modelling to examine how the adsorption of pollutants commonly found in leachate changed under competitive adsorption conditions and how competitive adsorption affected the CCL breakthrough of multiple pollutants. The results showed that the adsorption of the target pollutant on clay decreased by approximately 30% when competing pollutants were added. The speed at which the pollutants were transported through a 2-m-thick CCL increased, and the breakthrough times reduced by up to 24.8%, when the competing pollutants were mixed. Competitive adsorption significantly promoted the CCL breakthrough of pollutants at low concentrations, but it had limited effect on pollutants at high concentrations.

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Effect of the leachate head on the key pollutant indicator in a municipal solid waste landfill barrier system

Cited by 20 publications

References 21 publications

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Assessment of Shallow Groundwater Contamination Resulting from a Municipal Solid Waste Landfill—A Case Study in Lianyungang, China

Effect of competitive adsorption on the transport of multiple pollutants through a compacted clay liner

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