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Continuous operation of thermophilic food waste digestion with side-stream ammonia stripping

Continuous operation of thermophilic food waste digestion with side-stream ammonia stripping
Continuous operation of thermophilic food waste digestion with side-stream ammonia stripping
Digesters fed on food waste (high nitrogen content) were operated successfully over an extended period using sidestream biogas stripping to control total ammonia nitrogen (TAN) below inhibitory concentrations. This is the first time biogas stripping has been used to achieve stable thermophilic operation with undiluted substrate of this type. Stripping columns operated batch-wise treated the equivalent of 1.7-4.1% of digester contents daily at pH >10 and 70 oC, with no detrimental effect on digestion. TKN removal was 54%, with potential to recover 3.5 kg N tonne-1 substrate. When stripping was stopped in one digester TAN increased, accompanied by rising propionic acid concentrations with progressive instability observed from 2.5 g N L-1. Eventual failure as TAN approached 5 g N L-1 was due to rapid acetic acid accumulation, resulting in a fall in pH to below 6.5. The pattern of VFA accumulation indicated failure of both acetoclastic methanogenesis and acetate oxidation.
anaerobic digestion, Ammonia, Food waste, biogas stripping, side-stream
0960-8524
611-620
Zhang, Wei
2ddf6d07-244b-4a0b-8a96-2867deb060d5
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Zhang, Wei
2ddf6d07-244b-4a0b-8a96-2867deb060d5
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f

Zhang, Wei, Heaven, Sonia and Banks, Charles J. (2017) Continuous operation of thermophilic food waste digestion with side-stream ammonia stripping. Bioresource Technology, 244 (Part 1), 611-620. (doi:10.1016/j.biortech.2017.07.180).

Record type: Article

Abstract

Digesters fed on food waste (high nitrogen content) were operated successfully over an extended period using sidestream biogas stripping to control total ammonia nitrogen (TAN) below inhibitory concentrations. This is the first time biogas stripping has been used to achieve stable thermophilic operation with undiluted substrate of this type. Stripping columns operated batch-wise treated the equivalent of 1.7-4.1% of digester contents daily at pH >10 and 70 oC, with no detrimental effect on digestion. TKN removal was 54%, with potential to recover 3.5 kg N tonne-1 substrate. When stripping was stopped in one digester TAN increased, accompanied by rising propionic acid concentrations with progressive instability observed from 2.5 g N L-1. Eventual failure as TAN approached 5 g N L-1 was due to rapid acetic acid accumulation, resulting in a fall in pH to below 6.5. The pattern of VFA accumulation indicated failure of both acetoclastic methanogenesis and acetate oxidation.

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Zhang et al thermostrip - accepted version - Accepted Manuscript
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More information

Accepted/In Press date: 29 July 2017
e-pub ahead of print date: 3 August 2017
Published date: November 2017
Keywords: anaerobic digestion, Ammonia, Food waste, biogas stripping, side-stream

Identifiers

Local EPrints ID: 415001
URI: http://eprints.soton.ac.uk/id/eprint/415001
ISSN: 0960-8524
PURE UUID: d68c535f-0b06-4db8-96f6-ce53625b9642
ORCID for Sonia Heaven: ORCID iD orcid.org/0000-0001-7798-4683

Catalogue record

Date deposited: 20 Oct 2017 16:31
Last modified: 07 Oct 2020 04:24

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