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.

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 Hydraulic Conductivity of Compacted Laterite Treated with Iron Ore Tailings

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Umar Sa’eed Yusuf ◽  
Matawal Danladi Slim ◽  
Elinwa Augustine Uchechukwu
Keyword(s):  
Hydraulic Conductivity ◽  
Iron Ore ◽  
Deionized Water ◽  
Point Of View ◽  
Economic Point ◽  
Compacted Soil ◽  
Iron Ore Tailings ◽  
Compactive Effort ◽  
Soil Pores ◽  
Waste Leachate

The objective of this study was to investigate the effect of iron ore tailings (IOT) on hydraulic conductivity of compacted laterite. The IOT conforms to ASTM C 618-15 Type F designations. In the present study, soil was admixed with 0–20% IOT and compacted at moulding water content ranging from 10 to 25% using four types of compactive efforts. Hydraulic conductivities of the compacted soil-IOT mixtures were determined using deionized water and municipal solid waste leachate as the permeant fluids, respectively. Deionized water was the reference permeant fluid. Results of this study showed that hydraulic conductivity decreased with increase in IOT content as a result of improvement in mechanical properties of the soil. Permeation of the soil-IOT mixtures with leachate caused the hydraulic conductivity to drop to less than 1 × 10−9 m/s especially at higher compactive efforts. Also, bioclogging of the soil pores due to accumulation of biomass from bacteria and yeast present in the leachate tends to significantly reduce the hydraulic conductivity. From an economic point of view, it has been found from the results of this study that soil specimens treated with up to 20% IOT and compacted at the British Standard Light (BSL) compactive effort met the maximum regulatory hydraulic conductivity of less than or equal to 1 × 10−9 m/s for hydraulic barrier system.

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.

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 Phytoaccumulation of heavy metals from municipal solid waste leachate using different grasses under hydroponic condition

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Malik Muhammad Hassan ◽  
Noor Haleem ◽  
Muhammad Anwar Baig ◽  
Yousuf Jamal
Keyword(s):  
Heavy Metals ◽  
Electrical Conductivity ◽  
Municipal Solid Waste ◽  
Chemical Oxygen Demand ◽  
Solid Waste ◽  
Oxygen Demand ◽  
Elephant Grass ◽  
Vetiver Grass ◽  
Rhodes Grass ◽  
Waste Leachate

Abstract Grasses have been used widely to remediate contaminants present in domestic wastewater, but leachate generated from municipal solid waste that usually contain some concentrations of heavy metals has never been reported to be treated with grasses, especially Rhodes grass. A series of experiments was performed to investigate the contaminant uptake from municipal solid waste leachate by Chloris gayana (Rhodes grass) grown in combination with two commonly available grass varieties namely Vetiveria zizanioides (Vetiver grass) and Pennisetum purpureum (Elephant grass). Leachate used for the experiments had high values for chemical oxygen demand (5 g/L), pH (8.5), electrical conductivity (9.0 mS/cm), nitrates (182.1 mg/L), phosphates 6.4 mg/L along with heavy metals i.e. copper, zinc and manganese. Different dilutions of leachate ranging from 0 to 100% were applied in batches and their result showed that collectively all the grasses reduced overall contaminant concentrations. These were reported for chemical oxygen demand, electrical conductivity, nitrates, and phosphates reduced up to 67, 94, 94, and 73%, respectively. Metals uptake by grasses also showed a significant decrease in applied dose i.e. zinc (97%), copper (89%), and manganese (89%). Plant analysis showed that all grasses showed preference to heavy metals uptake e.g. Rhodes grass favoured up taking zinc, Elephant grass for copper and Vetiver grass preferred manganese. Overall growth performance of Rhodes grass was better in dilute leachate, whereas in more concentrated leachate, Rhodes grass did not perform better and production of biomass decreased. In Vetiver grass, root and shoot lengths decreased with increasing leachate strength, but the biomass did not change significantly.

Sign in / Sign up

Export Citation Format

Share Document