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Energy recovery of metallic aluminium in MSWI bottom ash: Different approaches to hydrogen production from MSWI bottom ash: A case study
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
2014 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Energiåtervinning av metallisk aluminium i MSWI bottenaska : Olika metoder att producera väte från MSWI bottenaska: En fallstudie (Swedish)
Abstract [en]

Most of the wastes in Sweden end up in incinerator plants. These trashes are full of metals, especially aluminium, which will not oxidize, they can’t always be recycled and they will instead oxidize in water and leak hydrogen gas to its surrounding. Estimations calculate it could be an average potential of around 40-50 kWh/ton of burnt trash. Ignoring the imported trash, the national recovery potential of Sweden’s 4,3 million tonnes of trash would then be equal to 170-220 GWh/year due to non-recyclable metals, which are currently going to temporary landfills. The requirements to harness this potential are technically simple, and can be achieved by a quick separation of the recyclables and the non-recyclables. This report will review the factors which increase the rate of reaction and study different ways of extracting the energy, by electrolysis, thermal treatment and mechanical mixing. This was done by taking small samples from the MSWI, owned by Umeå Energi AB, and putting them in small containers. While using the different methods, electrolysis, thermal treatment and mechanichal mixing, the amount of developed H2 gas over time was measured. The result shows that the best methods are mechanical mixing together with thermal treatment, where mechanical mixing seems to give the biggest effect of them two. The electrolysis did not work as intended, where there could be issues with the conductivity of the ash-mixture.

Place, publisher, year, edition, pages
2014. , 21 p.
Alphabeta Varia. Album Religionum Umense, ISSN 1104-1978
Keyword [en]
hydrogen, electrolysis, MSWI, ash
National Category
Energy Systems
URN: urn:nbn:se:umu:diva-95064OAI: diva2:757224
External cooperation
Umeå Energi AB
Subject / course
Educational program
Master of Science Programme in Energy Engineering
Available from: 2014-10-21 Created: 2014-10-21 Last updated: 2014-10-21Bibliographically approved

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Larsson, Rasmus
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