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Uppgradering av biogas i systemperspektiv med avseende på miljöpåverkan och kostnader
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2013 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Biogas upgrading in a systems perspective with respect to environmental impact and economic cost (English)
Abstract [en]

Swedish biogas is currently produced mainly by anaerobic digestion of sewage sludge

at sewage treatment plants, landfills and anaerobic digestion of household or industrial

waste. Also cattle ma-nure from farms can be used to produce biogas. Upgrading

biogas represents an increase in methane concentration from about 65 % to about 97

%. In addition, particles and contaminants must be sepa-rated from the upgraded

biogas. There are various methods for upgrading and this report compares six

different methods with respect to environment and economy: water scrubber,

Biosling, cryo technology, chemical absorption, Pressure Swing Adsorption (PSA) and

membrane separation.

According to the used ORWARE model, chemical adsorption with amine has the least

environmen-tal impact (methane emissions) and the lowest costs. The chemical used

in the method is very good at reducing CO2 and chemical adsorption gives an

upgraded gas containing around 99 % methane. The downside of amine is that it

contributes to the acidification of the environment and additional heat is needed to

free the CO2. It is also a small scale method. PSA and membrane separation shall be

avoided when it comes to environmental impacts. When it comes to the economy, it

is more dif-ficult to compare the methods. The reason is that the scale does matter

together with factors such as geography. The methods are also improving and

modernizing. It is important to consider this and be up to date when investing in a

new biogas upgrading plant.

Place, publisher, year, edition, pages
2013. , 40 p.
Series
UPTEC F, ISSN 1401-5757 ; 13009
Keyword [sv]
biogas, uppgradering
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-200139OAI: oai:DiVA.org:uu-200139DiVA: diva2:622259
Educational program
Master Programme in Engineering Physics
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-06-03 Created: 2013-05-20 Last updated: 2013-06-03Bibliographically approved

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