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Ageing of bottom ash with regard to its compatibility with bentonite
2006 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The Division of Waste Science and Technology at Luleå Technical University on behalf of and in co-operation with Telge Återvinning, Swedish recycling company, is developing a cover system with recycled waste materials, e.g. fly ash, digested sewage sludge and a mixture of bottom ash with bentonite. This Master Thesis is focused on the characterization of bottom ashes from the Tveta landfill (Telge Återvinning AB) that were deposited for ageing for a period of nine months. The aim was to assess the compatibility of the bottom ashes with Friedland clay, a type of bentonite, when mixed in order to be used as liner in a top cover construction on a landfill. For that purpose three main laboratory analyses were performed: • Leaching tests in order to determine the concentrations of elements that were leached from the bottom ashes. • The carbonation test in order to follow up the process of ageing of bottom ash under laboratorial conditions. • The permeability test in order to measure the hydraulic conductivity of the mixture of bottom ash with Friedland clay and to investigate if and how high pH values of bottom ash influence the properties of the Friedland clay. Two different mixtures of the bottom ash with Friedland clay were tested: • Non-aged ash in mixture with 8% of Friedland clay and • Aged ash in mixture with 10% of Friedland clay. The ageing process reduces the pH value of the bottom ash, which is important for its compatibility with Friedland clay. The treated ash does not generate leachate, which could deteriorate the chemical and mechanical properties of the Friedland clay.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Bottom ash, Bentonite, Friedland clay, Carbonation, Leaching, Permeability, Ageing processes of ashes
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57198ISRN: LTU-EX--06/058--SELocal ID: de2d785c-9ea1-40bc-992c-9b6234ca67c6OAI: diva2:1030585
Subject / course
Student thesis, at least 30 credits
Educational program
Applied Geoscience and Mining, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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