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
687-692
Climenhaga, M.A.
6e714444-1be6-4b73-8388-ea447a6cc0af
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
2008
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), .
(doi:10.2166/wst.2008.092).
(PMID:18401139)
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.
Text
Climenhaga and Banks TE_2008_post_print.pdf
- Author's Original
More information
Published date: 2008
Keywords:
anaerobic digestion, catering wastes, foodwastes, micronutrients
Organisations:
Civil Engineering & the Environment
Identifiers
Local EPrints ID: 52992
URI: http://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: 16 Mar 2024 02:52
Export record
Altmetrics
Contributors
Author:
M.A. Climenhaga
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
