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Inoculum source determines acetate and lactate production during anaerobic digestion of sewage sludge and food waste

Moestedt, Jan and Westerholm, Maria and Isaksson, Simon and Schnürer, Anna (2019). Inoculum source determines acetate and lactate production during anaerobic digestion of sewage sludge and food waste. Bioengineering. 7 , 3
[Research article]

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Abstract

Acetate production from food waste or sewage sludge was evaluated in four semi-continuous anaerobic digestion processes. To examine the importance of inoculum and substrate for acid production, two different inoculum sources (a wastewater treatment plant (WWTP) and a co-digestion plant treating food and industry waste) and two common substrates (sewage sludge and food waste) were used in process operations. The processes were evaluated with regard to the efficiency of hydrolysis, acidogenesis, acetogenesis, and methanogenesis and the microbial community structure was determined. Feeding sewage sludge led to mixed acid fermentation and low total acid yield, whereas feeding food waste resulted in the production of high acetate and lactate yields. Inoculum from WWTP with sewage sludge substrate resulted in maintained methane production, despite a low hydraulic retention time. For food waste, the process using inoculum from WWTP produced high levels of lactate (30 g/L) and acetate (10 g/L), while the process initiated with inoculum from the co-digestion plant had higher acetate (25 g/L) and lower lactate (15 g/L) levels. The microbial communities developed during acid production consisted of the major genera Lactobacillus (92–100%) with food waste substrate, and Roseburia (44–45%) and Fastidiosipila (16–36%) with sewage sludge substrate. Use of the outgoing material (hydrolysates) in a biogas production system resulted in a non-significant increase in bio-methane production (+5–20%) compared with direct biogas production from food waste and sewage sludge.

Authors/Creators:Moestedt, Jan and Westerholm, Maria and Isaksson, Simon and Schnürer, Anna
Title:Inoculum source determines acetate and lactate production during anaerobic digestion of sewage sludge and food waste
Series Name/Journal:Bioengineering
Year of publishing :2019
Volume:7
Article number:3
Number of Pages:19
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:acetate, lactate, inoculum, food waste, sewage sludge, lactic acid bacteria
URN:NBN:urn:nbn:se:slu:epsilon-p-114210
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114210
Additional ID:
Type of IDID
DOI10.3390/bioengineering7010003
ID Code:26013
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Department of Molecular Sciences
Deposited By: SLUpub Connector
Deposited On:02 Nov 2021 15:25
Metadata Last Modified:02 Nov 2021 15:31

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