A new simplified method to calculate breakthrough time of municipal solid waste landfill liners

Shu, Shi; Wang, Zhu; Shi, Jiangwei

doi:10.1016/j.jclepro.2019.02.050

Cited by 25 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some parameters for the model layers were obtained according to the geological investigation report, as shown in Table 2. e longitudinal dispersivities, diffusion coefficients, and retardation factors used to model the transport of the different heavy metal pollutants through the different materials were taken from previous publications and are shown in Table 2 [14][15][16][17].…”

Section: Model Generationmentioning

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Model Generationmentioning

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, the bottoms and sides of municipal solid waste (MSW) landfills worldwide are fitted with CCLs to prevent pollution of the underground environment by leachate (Xie et al, 2015b; Zhan et al, 2017). Chen et al (2015), Xie et al (2015a), and Shu et al (2019a) found that the retardation factor of a landfill liner was proportional to its breakthrough time, which demonstrates that adsorption effectively slowed the pollutant transport through landfill liners.…”

Section: Introductionmentioning

confidence: 96%

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

et al. 2020

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…proposed a designing method to determine the liner thickness of landfill by an analytical method. In light of the complexity to estimate the transport of contaminant in landfills, Shu et al 32 . put forward a simplified method to calculate the breakthrough time through single CCL and composite liner.…”

Section: Introductionmentioning

confidence: 99%

Semi‐analytical solution for the two‐dimensional transport of organic contaminant through geomembrane with strip defects to the underlying soil liner

Sun

Peng

et al. 2022

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

Geosynthetic materials are widely adopted as part of barrier liners in landfills, while the existence of defects in geomembrane (GM) will significantly reduce the barrier efficiency and lead to unexpected pollution in the surrounding environment. In this study, a novel semi-analytical model was proposed to investigate the two-dimensional (2D) migration of organic contaminant through the GM with strip defects to the underlying soil liner (SL). This model has the superiority to consider the concentration condition in the defects, and describe more accurate concentration profiles in the SL. The combination of discretization method and integral transforms were applied to obtain semi-analytical solutions, which were then verified by numerical solutions. Results show that the existence of defects can substantially accelerate the migration process of contaminant through flawed GM to the underlying SL. Specifically, the time interval between migration curves in the model with defects can be 2 or 3 orders of magnitude shorter than that without defects under the same condition.

show abstract

A new simplified method to calculate breakthrough time of municipal solid waste landfill liners

Cited by 25 publications

References 14 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

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

Semi‐analytical solution for the two‐dimensional transport of organic contaminant through geomembrane with strip defects to the underlying soil liner

Contact Info

Product

Resources

About