Shrinkage behavior of clay liner material exposed to simulated municipal solid waste landfill leachate

1988 ◽  
Vol 15 (4) ◽  
pp. 500-508 ◽  
Author(s):  
J. P. A. Hettiaratchi ◽  
S. E. Hrudey ◽  
D. W. Smith ◽  
D. C. C. Sego
Keyword(s):  
Hydraulic Conductivity ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Effective Stress ◽  
Clay Liners ◽  
Laboratory Procedure ◽  
Liner Material ◽  
Landfill Liner ◽  
Free Swell ◽  
Soil Shrinkage

The use of hydraulic conductivity (k) of soil material as the sole basis for sanitary landfill liner design is reviewed. On one hand, k measurements obtained in the laboratory often vary by several orders of magnitude. On the other, laboratory-measured k values fail to address field behavior, where crack formation before and (or) during landfill operation may control the bulk permeability.A synaerisis shrinkage test (SST) to study the soil shrinkage caused by municipal solid waste (MSW) leachates is introduced. Leachates cause soil shrinkage by reducing interparticle repulsive stresses thereby increasing effective stress. The effective stress concept and double layer theory adequately describe the synaerisis shrinkage phenomenon. A strong correlation was obtained between percent strain, the soil–liquid parameter determined from SST results, and a volume change parameter (free swell difference, FSD) from sedimentation test results. The results provide a basis for a broader approach to landfill liner design. The SST, which supplies information on both volume shrinkage and permeability changes caused by leachate, provides a useful laboratory procedure for evaluating liner materials. Key words: clay liners, shrinkage, leachate, synaerisis, hydraulic conductivity.

scholarly journals A Study to Understand Reduction Behavior of Toxic Metal in Leachate Using Bentonite

2021 ◽  
Vol 23 (06) ◽  
pp. 402-408
Author(s):  
Anupam Kaushik ◽  
◽  
Dr. Sindhu J. Nair ◽  
Keyword(s):  
Hydraulic Conductivity ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Waste Disposal ◽  
Toxic Metals ◽  
Toxic Metal ◽  
Solid Waste Disposal ◽  
Liner Material ◽  
Reduction Behavior ◽  
Landfill Liner

Landfills are the most popular municipal solid waste disposal system. The landfill liner is designed to isolate the waste from the soil beneath to minimize the passage of leachate into the groundwater. Usually, compacted liner materials consist of soil rich in clay minerals for their low hydraulic conductivity. This study is an attempt to assess the use of bentonite as a potential liner material. With the addition of bentonite in landfill liner, the toxicity of leachate is expected to decrease. It was found that bentonite bed works as a shield against percolation of heavy toxic metals from leachate of landfills into soil and groundwater.

scholarly journals Evaluation of the Hydraulic Conductivity of Compacted Laterite-Metakaolin Mixtures for Solid Waste Leachate Containment

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Sa’eed Y Umar ◽  
Augustine U Elinwa
Keyword(s):  
Hydraulic Conductivity ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Deionized Water ◽  
Point Of View ◽  
Regression Equations ◽  
Liner Material ◽  
Natural Logarithm ◽  
Level Of Significance ◽  
Waste Leachate

This paper presents the results of a study conducted to investigate the benefits of using metakaolin (MK) with laterite as liner material for containment of municipal solid waste (MSW). Laboratory tests were conducted on laterite specimens treated with MK at concentrations of 0 - 20 % by weight of the soil and compacted using four types of compaction energies. Hydraulic conductivity was determined based on permeation of the compacted laterite - MK mixtures with deionized water (DW) and municipal solid waste leachate (MSWL), respectively. Deionized water was the reference permeant fluid.  The results showed that hydraulic conductivity generally decreased with increase in the percentage addition of MK to the soil. From an economic and sustainability point of view, it has been found from the results that 5 % MK can be added to soil and compacted at moulding water content of 14.1 % using the West African Standard (WAS) compaction energy to achieve the regulatory hydraulic conductivity of less than or equal to 1 x 10-9 m/s for compacted soil liner. The natural logarithm of the hydraulic conductivity experimental results were computed and used to develop regression equations for estimating hydraulic conductivity given MK contents and compaction energies. The results of the two-way analysis of variance (ANOVA) test carried out at 5 % level of significance showed that calculated F-statistics are statistically significant and the measured values of hydraulic conductivity compare well with the predicted values. The developed models can therefore be used to give good estimates of hydraulic conductivity of soils having similar properties with the laterite investigated in this study. Therefore, the developed models can be used to give good estimates of hydraulic conductivity of soils having similar properties with the laterite investigated in this study. Keywords ­_ Deionized water, Hydraulic conductivity, Leachate, Metakaolin, Municipal solid waste.

Testing the hydraulic conductivity of degraded municipal solid waste in China

2019 ◽  
pp. 1-8
Author(s):  
Yingfeng Wang ◽  
Zhenying Zhang ◽  
Hui Xu ◽  
Dazhi Wu ◽  
Xinyu He ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Municipal Solid Waste ◽  
Solid Waste

scholarly journals Reuse of Municipal Solid Waste from Incinerated Ash in the Stabilization of Clayey Soils

2020 ◽  
Vol 28 (4) ◽  
pp. 1-7
Author(s):  
B. J. S. Varaprasad ◽  
Jayaprakash Reddy Joga ◽  
Suryaprakash Reddy Joga
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Soil Stabilization ◽  
Sem Analysis ◽  
Primary Objective ◽  
Municipal Solid Wastes ◽  
Electron Microscopic ◽  
Swell Index ◽  
Swell Potential ◽  
Free Swell

AbstractA useful method for the disposal of waste from an incineration plant is to reuse it for geotechnical and civil engineering applications. The primary objective of this study concerns the reuse of local incinerated ash from municipal solid wastes in soil stabilization. Municipal Solid Waste Incinerated Ash (MSWIA) is blended with soil in various combinations and tested for its Atterberg limits, unconfined compressive strength (UCS), California Bearing Ratio (CBR), and Free Swell Index (FSI). A 1-D Consolidation Test was conducted, and changes in the soil during the test were examined by a scanning electron microscopic (SEM) analysis. The test results showed that there are increments in the UCS and CBR values with the reductions in the FSI, swell pressure, and swell potential of the treated soils.

Effect of plastic fragments on hydraulic characteristics of pretreated municipal solid waste

2006 ◽  
Vol 43 (12) ◽  
pp. 1333-1343 ◽  
Author(s):  
Mingliang Xie ◽  
Dirk Aldenkortt ◽  
Jean-Frank Wagner ◽  
Gerhard Rettenberger
Keyword(s):  
Fluid Flow ◽  
Hydraulic Conductivity ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Conceptual Model ◽  
Hydraulic Properties ◽  
Thin Sheet ◽  
Biological Pretreatment ◽  
Soil Material

A systematic study was undertaken of the granular composition and hydraulic properties of municipal solid waste (MSW) produced by mechanical–biological pretreatment (MBP–MSW) from three different treatment plants with the aim of evaluating the potential application of MBP–MSW as an alternative barrier material for landfill final cover systems. Despite its coarse granular composition, MBP–MSW has low hydraulic conductivity. Long-term permeability tests show that the hydraulic conductivity decreases with time. The most likely explanation for the long-term changes in permeability is the swelling of organic material contained within the compost. In the case of saturated flow, the virtually impermeable plastic fragments embedded in the material impede fluid flow. In the unsaturated case, such fragments slow down the drying process by disrupting fluid flow and allowing pooling of water above horizontally oriented fragments. The larger the number and size of the plastic fragments, the greater the influence on hydraulic conductivity and shrinkage. These processes can be better understood with the newly developed conceptual model, the thin-sheet model. Based on this conceptual model, laboratory tests were undertaken to compare natural soil material with mixtures of soil material and plastic fragments. Corresponding numerical simulations of some experiments verified the influence of plastic fragments on the hydraulic properties of MBP–MSW.Key words: mechanical–biological pretreatment, municipal solid waste (MSW), thin-sheet model, plastic fragment, hydraulic conductivity, drying test.

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