Home About Browse Search
Svenska


Serial anaerobic digestion improves protein degradation and biogas production from mixed food waste

Perman, Ebba and Schnürer, Anna and Schnurer, Anna and Bjorn, Annika and Moestedt, Jan (2022). Serial anaerobic digestion improves protein degradation and biogas production from mixed food waste. Biomass and Bioenergy. 161 , 106478
[Research article]

[img] PDF
772kB

Abstract

Optimization of the biogas generation process is important to achieve efficient degradation and high methane yield, and to reduce methane emissions from the digestate. In this study, serial digester systems with two or three biogas reactors were compared with a single reactor, with the aim of improving degree of degradation and methane yield from food waste and assessing adaptation of microbial communities to different reactor steps. All systems had the same total organic load (2.4 g VS/(L d)) and hydraulic retention time (55 days). Serial systems increased methane yield by >5% compared with the single reactor, with the majority of the methane being obtained from the first-step reactors. Improved protein degradation was also obtained in serial systems, with >20% lower outgoing protein concentration compared with the single reactor and increasing NH4+-N concentration with every reactor step. This resulted in separation of high ammonia (>384 mg NH3-N/L) levels from the main methane production, reducing the risk of methanogen inhibition. Methanosarcina dominated the methanogenic community in all reactors, but increases in the hydrogenotrophic genera Methanoculleus and Methanobacterium were observed at higher ammonia levels. Potential syntrophic acetate-oxidizing bacteria, such as MBA03 and Dethiobacteraceae, followed the same trend as the hydrogenotrophic methanogens. Phylum Bacteroidota family Paludibacteraceae was highly abundant in the first steps and then decreased abruptly, potentially linked to an observed decrease in degradation in the last-step reactors. Nevertheless, the results indicated a trend of increasing relative abundance of the potentially proteolytic genera Proteiniphilum and Fastidiosipila with successive reactor steps.

Authors/Creators:Perman, Ebba and Schnürer, Anna and Schnurer, Anna and Bjorn, Annika and Moestedt, Jan
Title:Serial anaerobic digestion improves protein degradation and biogas production from mixed food waste
Series Name/Journal:Biomass and Bioenergy
Year of publishing :2022
Volume:161
Article number:106478
Number of Pages:11
Publisher:PERGAMON-ELSEVIER SCIENCE LTD
ISSN:0961-9534
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 209 Industrial Biotechnology > Bioenergy
Keywords:Biogas, Anaerobic digestion, Serial digestion, Food waste, Protein degradation
URN:NBN:urn:nbn:se:slu:epsilon-p-118034
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118034
Additional ID:
Type of IDID
DOI10.1016/j.biombioe.2022.106478
Web of Science (WoS)000806273200001
ID Code:28646
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Molecular Sciences
Deposited By: SLUpub Connector
Deposited On:30 Aug 2022 12:26
Metadata Last Modified:30 Aug 2022 12:31

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits