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Quality and function of anaerobic digestion residues

Risberg, Kajsa (2015). Quality and function of anaerobic digestion residues. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2015:40
ISBN 978-91-576-8278-9
eISBN 978-91-576-8279-6
[Doctoral thesis]

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Abstract

The growing number of biogas plants in Europe has resulted in increased production of nutrient-rich digestate, which has potential as fertiliser on arable land. Many different organic materials can be degraded in the anaerobic digestion process, with most macronutrients and micronutrients retained in the digestate. Depending on the ingoing organic substrate and management of the biogas process, the nutrient content of digestate varies widely. It can also contain compounds such as heavy metals and organic pollutants that are potentially toxic to soil microorganisms. Previous studies on the effect of digestate on soil microorganisms and crop yield have yielded contradictory results, so further investigations are needed to determine its true fertiliser value. In this thesis, the fertiliser effect of different types of digestate originating from biogas plants operating with various substrates and operating parameters was determined by measuring: 1) general and specific soil microbial activity, 2) bacterial and archaeal community composition, 3) crop growth and 4) chemical and physical composition of different digestates. Soil respiration generally displayed a positive response to digestate addition, but soil respiration curves revealed differences in quality and quantity of organic carbon between digestate, pig slurry and cow manure. However, the total utilisation rate of the organic carbon in digestate, pig slurry and cow manure did not differ. Moreover, digestate showed both stimulatory and inhibitory effects on potential ammonia oxidation, while pig slurry and cow manure had a more consistent inhibitory effect. Addition of digestate to soil resulted in increased wheat yield compared with control soil and mineral fertiliser, but final yield was not as high as that from pig slurry. Digestate was also generally characterised by a higher content of ammonium and lower content of organic carbon than pig slurry and cow manure. Addition of digestate to soil resulted in changes in the microbial community structure, with less pronounced effect in sandy soils, but no change in diversity was detected.

It can be concluded that the digestate from biogas plants has great potential as a fertiliser in crop production and does not seem to pose a greater risk of disturbing soil microorganisms than pig slurry and cow manure when spread on arable land.

Authors/Creators:Risberg, Kajsa
Title:Quality and function of anaerobic digestion residues
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2015
Depositing date:24 March 2015
Volume:2015:40
Number of Pages:56
Papers/manuscripts:
NumberReferences
IAbubaker, J., Risberg, K. & Pell, M. (2010). Biogas residues as fertilisers – Effects on wheat growth and soil microbial activities. Applied Energy 99, 126-134.
IIAbubaker, J., Risberg, K., Jönsson, E., Dahlin, S., Cederlund, H. & Pell, M. (2015). Short-term effects of biogas digestates and pig slurry application on soil microbial activity. Applied and Environmental Soil Science 2015, Article ID 658542.
IIIRisberg, 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 and Technology 149, 232-237.
IVRisberg, K., Cederlund, H., Pell, M., Arthurson, V. & Schnürer, A. Biogas residues as agricultural crop fertilizers – comparative characterization with pig slurry and cow manure (submitted).
VRisberg, K., Sun, L., Arthurson, V., Pell, M. & Schnürer, A. Characterization of bacterial and archaeal communities in soil after amendment with anaerobic digestate as fertilising agent (manuscript in preparation).
Place of Publication:Uppsala
Publisher:Department of Microbiology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8278-9
ISBN for electronic version:978-91-576-8279-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F04 Fertilizing
P Natural resources > P06 Renewable energy resources
Q Food science > Q70 Processing of agricultural wastes
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Renewable Bioenergy Research
Agrovoc terms:biogas, farmyard manure, wheat straw, residues, anaerobic treatment, crop yield, soil microorganisms, soil respiration, ammonia, oxidation
Keywords:Digestion residue, Fertiliser, Animal manure
URN:NBN:urn:nbn:se:slu:epsilon-e-2509
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2509
ID Code:12017
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Microbiology (until 161231)
Deposited By: Kajsa Risberg
Deposited On:26 Mar 2015 07:31
Metadata Last Modified:19 Apr 2015 01:12

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