EPELLE, PROMISE SOKARI and Covenant University, Theses (2022) HYDRAULIC PROPERTIES AND WATER-REPELLENCY OF ORGANOSILANE-TREATED SOIL AS AN ALTERNATIVE MATERIAL UTILISED IN A LANDFILL LINER SYSTEM. Masters thesis, COVENANT UNIVERSITY.
![[img]](http://eprints.covenantuniversity.edu.ng/style/images/fileicons/application_pdf.png) |
PDF
Download (269kB) |
Abstract
In developing countries, where cost and availability of geomaterials utilised in the design and construction of landfills is an issue, cost-effective options are urgently needed. This work focuses on the issue of waste management, landfills, and a more economical alternative for a landfill liner system. It assesses the hydraulic properties and water-repellency of organosilane-treated soil as an alternative material utilised in a landfill liner system. Hydraulic conductivity test and water droplet penetration tests were carried out on the untreated and treated soil at variations; 1:1000, 1:500, 1:100, 1:80 and 1:50. These variations were done by mass with respect to an organosilane to soil correlation. The hydraulic conductivity of the natural soil at 1.74 × 10-5 cm/s reduced to 5.03 × 10-6 cm/s, 4.54 × 10-6 cm/s, 1.77 × 10-6 cm/s, 7.78 × 10-7 cm/s and 6.36 × 10-8 cm/s at 1:1000, 1:500, 1:100, 1:80 and 1:50 respectively. This reduction indicated that higher organosilane content in the soil causes lower hydraulic conductivity. From the tests on hydraulic characteristics, it was concluded that only 1:50 met the requirement for a liner material with the value being less than 1 × 10-7cm/s. Also, the water droplet penetration time using precision pipette and a stopwatch was carried out to determine its degree of water-repellency. It was observed from the tests that the water droplet penetration time for the untreated soil at zero seconds increased to 300, 1140, 6210, 7800 and 9450 seconds at 1:1000, 1:500, 1:100, 1:80 and 1:50 respectively. This increment in time indicated that an increase in organosilane content increases the time it takes for water to penetrate into the soil fabric. Mix ratio 1:1000 came out as strongly repellent, 1:500 was severely repellent while 1:100, 1:80 and 1:50 were extremely water repellent samples. From these analyses, it was concluded that organosilane-treatment causes the soil structure to become compact causing higher packing density, and low porosity in the microstructure. Hence, an organosilane-treated layer in a composite liner system is a promising replacement for geomembrane in a landfill.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Geomembrane, Hydraulic Conductivity, Landfill, Organosilane, Waste Management. |
| 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: | AKINWUMI |
| Date Deposited: | 07 Oct 2022 12:37 |
| Last Modified: | 07 Oct 2022 12:37 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/16290 |
Actions (login required)
 |
View Item |
