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Biogas production from lignocellulosic materials

microbial community structure

Sun, Li (2015). Biogas production from lignocellulosic materials. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2015:83
ISBN 978-91-576-8364-9
eISBN 978-91-576-8365-6
[Doctoral thesis]

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Lignocellulosic materials such as agricultural plant residues are widely available in large amounts and can be used for production of biogas without the risk of competition for arable land. However, the intricate structure of lignocellulose, a major component of the plant cell wall, limits microbial degradation and consequently results in low degradation rate and low biogas yield. The aim of this thesis was to investigate microbial communities engaged in the degradation of lignocellulose and search for correlations with process operating parameters and degradation efficiency. Such information could be used in a long-term perspective for management of biogas processes towards more efficient degradation.

The bacterial and archaeal communities as well as functional gene communities of glycoside hydrolase family 5 (cel5) and 48 (cel48), representing potential cellulose-degrading bacteria, were investigated in laboratory-scale and industrial-scale digesters; and their incidence was related to process parameters. The laboratory-scale digesters were operated with manure, alone or in co-digestion with wheat straw (mechanically chopped or treated with steam explosion), at different temperatures. The results demonstrated that all digesters had similar overall process performance, e.g. degree of degradation and biogas yield, irrespective of straw addition or changes in temperature. However, the microbial communities, including potential cellulose-degrading bacteria, changed in response to the changes in operation, e.g. addition of straw, pre-treatment and operating temperature. In a survey of degradation efficiency of cellulose and wheat straw in 10 industrial-scale biogas plants in Sweden, free ammonia level was identified as a potential factor affecting degradation efficiency as well as the species richness and taxonomic composition of bacterial communities, including the cel5 community.

This thesis presents novel information about microbial communities in biogas processes degrading lignocellulosic materials and their response to operating parameters.

Authors/Creators:Sun, Li
Title:Biogas production from lignocellulosic materials
Subtitle:microbial community structure
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :13 August 2015
Depositing date:13 August 2015
Number of Pages:60
IRisberg, K., Sun, L., Levén, L., Horn, S.J. & Schnürer, A. (2013). Biogas production from wheat straw and manure – Impact of pretreatment and process operating parameters. Bioresource Technology 149, 232-237.
IISun, L., Müller, B. & Schnürer, A. (2013). Biogas production from wheat straw: community structure of cellulose-degrading bacteria. Energy, Sustainability and Society 3, 15.
IIISun, L., Pope, P.B., Eijsink, V.G. & Schnürer, A. (2015). Characterisation of microbial community structure during continuous anaerobic digestion of straw and cow manure. Microbial Biotechnology (doi:10.1111/1751-7915.12298).
IVSun, L., Liu, T., Müller, B. & Schnürer, A. Straw and cellulose degradation efficiency in industrial biogas plants in Sweden and correlation to microbial community structure (manuscript).
Place of Publication:Uppsala
Publisher:Department of Microbiology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8364-9
ISBN for electronic version:978-91-576-8365-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P06 Renewable energy resources
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Biochemistry and Molecular Biology
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Agrovoc terms:anaerobic treatment, lignocellulose, microbial properties, straw, farmyard manure, biogas, biodegradation, microbial ecology
Keywords:anaerobic digestion, lignocellulose, archaeal and bacterial community structure, straw, cow manure, anaerobic cellulose-degrading bacteria, glycoside hydrolase family 5 and 48
Permanent URL:
ID Code:12494
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Microbiology (until 161231)
External funders:Swedish Energy Agency and The Research Council of Norway (Norges Forskningsråd)
Deposited By: Li Sun
Deposited On:13 Aug 2015 14:12
Metadata Last Modified:10 Sep 2020 13:41

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