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Engineering of clay lining system for landfills using bio-material to improve its adsorption of Pb2+

Akinwumi, I. I. and Ojuri , O. O. and Ogbiye, S. A. and Booth, C. A. (2016) Engineering of clay lining system for landfills using bio-material to improve its adsorption of Pb2+. In: Engineering and Life Conference, October 19-21, 2016, Hannover, Germany.

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Lead (Pb), a heavy metal that can leach from landfills, is one of the most lethal heavy metals to man. A clay modified with sawdust, a waste from processing wood, was investigated for its potential to prevent Pb2+ from lead-containing wastes disposed at landfills from contaminating groundwater and thereby protect public health. The chemical and mineralogical composition of the clay, and microstructural analysis of the clay and sawdust-modified-clay were determined. The effects of sawdust on the suitable use of the modified clay as a landfill liner was investigated by carrying out specific gravity, Atterberg’s limits, compaction, unconfined compressive strength (UCS) and permeability tests. Batch equilibrium adsorption test was used to evaluate the sorption of Pb2+ on the clay and sawdust-modified-clay at varying initial concentrations and contact times. The clay, which is classified as a clay of high plasticity (CH), has low permeability and strength. The modification of the clay with increasing percentages of the sawdust altered its geotechnical properties by: reducing its plasticity, specific gravity, maximum dry unit weight, and UCS; and increasing its optimum moisture content and permeability. The admixing of the clay with 8% sawdust, by weight of the soil, provided a modified clay whose geotechnical properties satisfy standard requirements for use as landfill liner materials. The batch adsorption test results indicate that the application of the sawdust successfully improved the Pb2+ adsorption capacity of the clay. The Pb2+ adsorption capacity of the clay and sawdust-modified-clay increased with increasing initial concentration. The batch studies also show that optimal Pb2+ adsorption of 91% was achieved by the sawdust-modified-clay, when the initial Pb2+ concentration of 100 mg/L in the solution was used and after a contact time of 120 minutes. The Freundlich isotherm provided a better fit for the description of the adsorption process at equilibrium than the Langmuir isotherm while the pseudo-second-order kinetic model is the best representation of the adsorption rate. Consequently, sawdust is recommended as a low-cost modifier of clay for use in liner system for the containment Pb2+ while also preventing the nuisance associated with improper disposal of sawdust.

Item Type: Conference or Workshop Item (Poster)
Subjects: T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 19 Jan 2017 04:04
Last Modified: 07 Nov 2017 11:20

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