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Trace element requirements for stable food waste digestion at elevated ammonia concentrations

Trace element requirements for stable food waste digestion at elevated ammonia concentrations
Trace element requirements for stable food waste digestion at elevated ammonia concentrations
The work investigated why anaerobic digesters treating food waste and operating at high ammonia concentrations suffer from propionic acid accumulation which may result in process failure. The results showed deficiency of selenium, essential for both propionate oxidation and syntrophic hydrogenotrophic methanogenesis, leads to this while supplementation allows operation at substantially higher organic loading rates (OLR). At high loadings cobalt also becomes limiting, due to its role either in acetate oxidation in a reverse Wood-Ljungdahl or in hydrogenotrophic methanogenesis. Population structure analysis using fluorescent in situ hybridization showed only hydrogenotrophic methanogens. Critical Se and Co concentrations were established as 0.16 and 0.22 mg kg?1 fresh matter feed at moderate loading. At this dosage the OLR could be raised to 5 g VS l?1 day?1 giving specific and volumetric biogas productions of 0.75 m3 kg?1 VSadded and 3.75 STP m3 m?3 day?1, representing a significant increase in process performance and operational stability.
selenium, cobalt, methanogenesis, food waste, propionic acid accumulation
0960-8524
127-135
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Jiang, Ying
e6e39ee2-e0a6-4e60-9604-ce363c7ce5f9
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Jiang, Ying
e6e39ee2-e0a6-4e60-9604-ce363c7ce5f9
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571

Banks, Charles J., Zhang, Yue, Jiang, Ying and Heaven, Sonia (2012) Trace element requirements for stable food waste digestion at elevated ammonia concentrations. Bioresource Technology, 104, 127-135. (doi:10.1016/j.biortech.2011.10.068).

Record type: Article

Abstract

The work investigated why anaerobic digesters treating food waste and operating at high ammonia concentrations suffer from propionic acid accumulation which may result in process failure. The results showed deficiency of selenium, essential for both propionate oxidation and syntrophic hydrogenotrophic methanogenesis, leads to this while supplementation allows operation at substantially higher organic loading rates (OLR). At high loadings cobalt also becomes limiting, due to its role either in acetate oxidation in a reverse Wood-Ljungdahl or in hydrogenotrophic methanogenesis. Population structure analysis using fluorescent in situ hybridization showed only hydrogenotrophic methanogens. Critical Se and Co concentrations were established as 0.16 and 0.22 mg kg?1 fresh matter feed at moderate loading. At this dosage the OLR could be raised to 5 g VS l?1 day?1 giving specific and volumetric biogas productions of 0.75 m3 kg?1 VSadded and 3.75 STP m3 m?3 day?1, representing a significant increase in process performance and operational stability.

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More information

e-pub ahead of print date: 2 November 2011
Published date: January 2012
Keywords: selenium, cobalt, methanogenesis, food waste, propionic acid accumulation
Organisations: Centre for Environmental Science

Identifiers

Local EPrints ID: 300462
URI: https://eprints.soton.ac.uk/id/eprint/300462
ISSN: 0960-8524
PURE UUID: da34ab74-0011-4ae5-9146-129693ee867d
ORCID for Yue Zhang: ORCID iD orcid.org/0000-0002-5068-2260

Catalogue record

Date deposited: 22 Feb 2012 11:34
Last modified: 06 Jun 2018 12:47

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