Digestion of frozen/thawed food waste in the hybrid anaerobic solid-liquid system
Abstract
The hybrid anaerobic solid-liquid (HASL) system, which is a modified two-phase anaerobic digester, is to be used in an industrial scale operation to minimize disposal of food waste at incineration plants in Singapore. The aim of the present research was to evaluate freezing/thawing of food waste as a pre-treatment for its anaerobic digestion in the HASL system. The hydrolytic and fermentation processes in the acidogenic reactor were enhanced when food waste was frozen for 24 h at -20 deg. C and then thawed for 12 h at 25 deg. C (experiment) in comparison with fresh food waste (control). The highest dissolved COD concentrations in the leachate from the acidogenic reactors were 16.9 g/l on day 3 in the control and 18.9 g/l on day 1 in the experiment. The highest VFA concentrations in the leachate from the acidogenic reactors were 11.7 g/l on day 3 in the control and 17.0 g/l on day 1 in the experiment. The same volume of methane was produced during 12 days in the control and 7 days in the experiment. It gave the opportunity to diminish operational time of batch process by 42%. The effect of freezing/thawing of food waste as pre-treatment for itsmore »
- Authors:
-
- School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 (Singapore)
- Publication Date:
- OSTI Identifier:
- 21153986
- Resource Type:
- Journal Article
- Journal Name:
- Waste Management
- Additional Journal Information:
- Journal Volume: 28; Journal Issue: 9; Other Information: DOI: 10.1016/j.wasman.2007.05.021; PII: S0956-053X(07)00221-8; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; ANAEROBIC DIGESTION; FERMENTATION; FOOD; FREEZING; HEAT; HYDROGEN 1; INCINERATORS; METHANE; MUNICIPAL WASTES; THAWING
Citation Formats
Stabnikova, O., Liu, X Y, and Wang, J Y. Digestion of frozen/thawed food waste in the hybrid anaerobic solid-liquid system. United States: N. p., 2008.
Web. doi:10.1016/j.wasman.2007.05.021.
Stabnikova, O., Liu, X Y, & Wang, J Y. Digestion of frozen/thawed food waste in the hybrid anaerobic solid-liquid system. United States. https://doi.org/10.1016/j.wasman.2007.05.021
Stabnikova, O., Liu, X Y, and Wang, J Y. 2008.
"Digestion of frozen/thawed food waste in the hybrid anaerobic solid-liquid system". United States. https://doi.org/10.1016/j.wasman.2007.05.021.
@article{osti_21153986,
title = {Digestion of frozen/thawed food waste in the hybrid anaerobic solid-liquid system},
author = {Stabnikova, O. and Liu, X Y and Wang, J Y},
abstractNote = {The hybrid anaerobic solid-liquid (HASL) system, which is a modified two-phase anaerobic digester, is to be used in an industrial scale operation to minimize disposal of food waste at incineration plants in Singapore. The aim of the present research was to evaluate freezing/thawing of food waste as a pre-treatment for its anaerobic digestion in the HASL system. The hydrolytic and fermentation processes in the acidogenic reactor were enhanced when food waste was frozen for 24 h at -20 deg. C and then thawed for 12 h at 25 deg. C (experiment) in comparison with fresh food waste (control). The highest dissolved COD concentrations in the leachate from the acidogenic reactors were 16.9 g/l on day 3 in the control and 18.9 g/l on day 1 in the experiment. The highest VFA concentrations in the leachate from the acidogenic reactors were 11.7 g/l on day 3 in the control and 17.0 g/l on day 1 in the experiment. The same volume of methane was produced during 12 days in the control and 7 days in the experiment. It gave the opportunity to diminish operational time of batch process by 42%. The effect of freezing/thawing of food waste as pre-treatment for its anaerobic digestion in the HASL system was comparable with that of thermal pre-treatment of food waste at 150 deg. C for 1 h. However, estimation of energy required either to heat the suspended food waste to 150 deg. C or to freeze the same quantity of food waste to -20 deg. C showed that freezing pre-treatment consumes about 3 times less energy than thermal pre-treatment.},
doi = {10.1016/j.wasman.2007.05.021},
url = {https://www.osti.gov/biblio/21153986},
journal = {Waste Management},
issn = {0956-053X},
number = 9,
volume = 28,
place = {United States},
year = {Tue Jul 01 00:00:00 EDT 2008},
month = {Tue Jul 01 00:00:00 EDT 2008}
}