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Anaerobic digestion of catering wastes: effect of micronutrients and solids retention time

Anaerobic digestion of catering wastes: effect of micronutrients and solids retention time
Anaerobic digestion of catering wastes: effect of micronutrients and solids retention time
Source-separated foodwastes collected from a campus catering facility were processed in bench-scale single-stage anaerobic digesters. The feedstock contained a varied mix of fruits, vegetables, meats and fried foods. A constant organic loading rate (OLR) was maintained with differing hydraulic retention times (HRT). Regular addition of trace elements or prolonged retention time allowed stable digestion at high total volatile fatty acid (TVFA) levels. Reactors on HRT of 25, 50, and 100 days with no micronutrient supplementation exhibited methanogenic failure after approximately 40, 100 and 90 days respectively, while duplicate reactors with micronutrient supplementation maintained stable digestion. An extended HRT of 180 days has so far allowed continued digestion (for reactors with and without micronutrient supplementation) at levels of ammonia nitrogen exceeding 5.7 g l-1 and volatile fatty acid levels exceeding 15 g l-1, usually considered inhibitory or toxic.
anaerobic digestion, catering wastes, foodwastes, micronutrients
0273-1223
687-692
Climenhaga, M.A.
6e714444-1be6-4b73-8388-ea447a6cc0af
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Climenhaga, M.A.
6e714444-1be6-4b73-8388-ea447a6cc0af
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f

Climenhaga, M.A. and Banks, C.J. (2008) Anaerobic digestion of catering wastes: effect of micronutrients and solids retention time. Water Science & Technology, 57 (5), 687-692. (doi:10.2166/wst.2008.092). (PMID:18401139)

Record type: Article

Abstract

Source-separated foodwastes collected from a campus catering facility were processed in bench-scale single-stage anaerobic digesters. The feedstock contained a varied mix of fruits, vegetables, meats and fried foods. A constant organic loading rate (OLR) was maintained with differing hydraulic retention times (HRT). Regular addition of trace elements or prolonged retention time allowed stable digestion at high total volatile fatty acid (TVFA) levels. Reactors on HRT of 25, 50, and 100 days with no micronutrient supplementation exhibited methanogenic failure after approximately 40, 100 and 90 days respectively, while duplicate reactors with micronutrient supplementation maintained stable digestion. An extended HRT of 180 days has so far allowed continued digestion (for reactors with and without micronutrient supplementation) at levels of ammonia nitrogen exceeding 5.7 g l-1 and volatile fatty acid levels exceeding 15 g l-1, usually considered inhibitory or toxic.

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Climenhaga and Banks TE_2008_post_print.pdf - Author's Original
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More information

Published date: 2008
Keywords: anaerobic digestion, catering wastes, foodwastes, micronutrients
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 52992
URI: https://eprints.soton.ac.uk/id/eprint/52992
ISSN: 0273-1223
PURE UUID: 49a1f28b-ed41-4429-8954-47329ef455f9

Catalogue record

Date deposited: 17 Jul 2008
Last modified: 04 Nov 2019 19:06

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