Geomechanics and Engineering
Volume 44, Number 1
DOI: 025-49
Performance of NaOH-activated fly ash mixtures as candidate landfill liner materials
Ugur E. Yurtcan , Hakan İkiz , Lale Oncu , Seracettin Arasan
Abstract
To prevent contamination, the disposal of solid wastes in a landfill is a common practice in most countries. According to the USEPA regulation, the liner of waste disposal landfills must have a hydraulic conductivity of no more than 1x10-7 cm/sec. Fly ash, a by-product of thermal power plants, is generated in significant quantities; approximately 13 million tons are produced annually by 11 thermal power plants in Turkey. This study aims to evaluate the feasibility of using fly ash as a liner material. For this purpose, Type C fly ash was obtained from Afşin- Elbistan power plant in Turkiye and modified by NaOH, xanthan gum, bentonite, borogypsum and glucose monohydrate in laboratory. To investigate the properties of the modified material, hydraulic conductivity, unconfined compression, contact angle, XRD, and SEM tests were performed. The results indicated that the engineering properties of the modified fly ash changed significantly compared to the raw material. Based on these findings, fly ash treated with NaOH, xanthan gum, and glucose monohydrate achieved lower hydraulic conductivity and can be considered a suitable material for use as a waste disposal landfill liner.
Key Words
contact angle; fly ash; glucose monohydrate; hydraulic conductivity; liner; NaOH; xanthan gum
Address
- Uğur E. Yurtcan — Bingol University, Vocational School of Technical Science, 12000 Bingol, Turkiye; Bingöl University Centre for Energy, Environment and Natural Disasters, Bingol, Turkiye
- Hakan İkiz — Skyline Homes Inc. Erzurum, Türkiye
- Lale Oncu — Erzurum Provincial Directorate of Environment and Urbanization, Erzurum, Turkiye
- Seracettin Arasan — Evreka Engineering Comp., Erzurum, Türkiye
- Lale Oncu — Erzurum Provincial Directorate of Environment and Urbanization, Erzurum, Turkiye
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