Performance of Soils and Soil Lime Mixtures As Liners to Retain Heavy Metal Ions in Aqueous Solutions

Moghal, Arif Ali Baig; Mohammed, Syed Abu Sayeed; Al‐Shamrani, Mosleh; Zahid, Waleed M.

doi:10.1061/9780784413432.017

Cited by 7 publications

(8 citation statements)

References 2 publications

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“…In order to study the desorption response, leaching tests were conducted in accordance with ASTM -D3987 [24] maintaining load ratios of 100mg/kg and 50 mg/kg for both copper and chromium metal ions. This load ratio is consistent and it is not expected to influence any major change in leaching rate [1]. It can be observed from Fig.…”

Section: Leaching Testssupporting

confidence: 60%

“…Maximum adsorption takes place at acidic pH and due to protonation (defined as the attachment of H + ions forming complexes in acidic media). If the concentration of H + ions is more it would lead to better protonation [1,25]. From Fig.…”

Section: Leaching Testsmentioning

confidence: 98%

“…They are often cemented by calcium carbonate to form calcrete. These soils are usually sorted and deposited by wind resulting in the formation of poorly graded (single sized) soils having very loose soil structure [1]. These soils have a great potential to be used as landfill liner materials.…”

Section: Introductionmentioning

confidence: 99%

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Physico-Chemical and Geo-Environmental Behavior of Semi Arid Soils

Zahid¹,

Moghal²,

Obaid³

et al. 2017

geomate

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Soil is a basic building block for the most terrestric ecosystems and a complex heterogeneous medium consisting of both solid and fluid phases. Their physico-chemical characterization is of prime importance in understanding their prospective in various civil engineering applications. On the other hand, the ability of soils in absorbing and desorbing metal ions from the aqueous phase assumes importance since it governs both the environmental and agricultural issues. In this study, two different types of soils originating from diversified terrains of Saudi Arabia have been chosen and their potential application in various geotechnical and geo-environmental applications validated by carrying out typical characterization tests, including particle size distribution, density, shear and swelling characteristics. Further, in order to validate their potential applicability in typical landfill liners to retain toxic metal ions, their relative performance in retaining the heavy metal ions has been evaluated. Heavy metal ions such as copper and chromium were used to carry out sorption studies. Experimental data was used to plot adsorption isotherms. Langmuir isotherm was found to be more suitable than Freundlich isotherm for both the soils. It is observed both the soils, exhibited different physical and chemical characterization due to their difference in particle size gradations, as well as in mineralogy and surface morphology. Further, it is concluded that Al-Qatif soil can be used as a filter material and Al-Ghat soil as the main liner material to attenuate selected heavy metals, when they are used in the construction of a typical industrial landfill liner.

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Section: Leaching Testssupporting

confidence: 60%

Section: Leaching Testsmentioning

confidence: 98%

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Physico-Chemical and Geo-Environmental Behavior of Semi Arid Soils

Zahid¹,

Moghal²,

Obaid³

et al. 2017

geomate

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“…This increased the efficacy of NCS as a stabilizing material for long-term attenuation requirements of the industry. Further, to validate the use of NCS as a soil amendment, many more leaching tests have been performed under various conditions [17,18,21]. It was found that because of the organic nature of BCS and being an expansive soil with low strength parameters, it was decided to continue further tests only with red soil.…”

Section: Results and Discussion Leaching Studiesmentioning

confidence: 99%

“…Also, the longterm effects of this mixture is worthy of investments as this gives a permanent solution. This method uses only existing moisture in soil; however, cement-based solidification occurs slowly and requires excess of water to solidify while additional treatment costs are involved for gene rating secondary effluents from cement-based S/S techniques [17,29].…”

Section: Mechanism Of Encapsulation and Economic Analysismentioning

confidence: 99%

Efficacy of nano calcium silicate (NCS) treatment on tropical soils in encapsulating heavy metal ions: leaching studies validation

Mohammed¹,

Moghal

2016

Innov. Infrastruct. Solut.

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Soils are known to retain heavy metals through a number of processes. In this study, four different leaching methods viz. ASTM D3987, toxicity characteristics leaching procedure (TCLP), extended TCLP, and caged TCLP have been used to study the leaching behavior of Cd 2? , Ni 2? and Pb 2? on red and black cotton soils. Further, these soils were amended with nano calcium silicate (NCS). Also, sequential extraction was performed on these soil mixtures to know the extent of sorption taking place in different phases of soils such as exchangeable, oxidizing, reducing, organic content and residual phases. It was found that as per ASTM D3987, all three heavy metals with red soil and black cotton soil were retained well in the short term, and over a long-term period, the metal ion was released back. When amended with NCS, both red soil and black cotton soil exhibited satisfactory retention levels over long periods which proved that NCS was responsible for encapsulation of metal ions in its matrix. To investigate the retention efficiency, extensive leaching tests were performed, and it was found that as per TCLP, extended TCLP and caged TCLP tests, the retention with NCS-amended red earth soil was 88, 90 and 94 % compared to untreated case. Sequential extraction proved that encapsulation was durable in NCS-amended soils compared to untreated ones.Hence, it is concluded that NCS-amended soil is a prospective material to attenuate heavy metals taking into consideration their long-term encapsulation effect in considered soils. This soil NCS mixture is expected to be a potent agent for in situ treatment of brown fields and an excellent substitute for existing conventional landfill liner materials.

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