Anaerobic digestion of autoclaved and untreated food waste
Anaerobic digestion of autoclaved and untreated food waste
Anaerobic digestion of autoclaved (160 °C, 6.2 bar) and untreated source segregated food waste (FW) was compared over 473 days in semi-continuously fed mesophilic reactors with trace elements supplementation, at organic loading rates (OLRs) of 2, 3, 4 and 6 kg volatile solids (VS)/m3 d. Methane yields at all OLR were 5–10% higher for untreated FW (maximum 0.483 ± 0.013 m3 CH4/kg VS at 3 kg VS/m3 d) than autoclaved FW (maximum 0.439 ± 0.020 m3 CH4/kg VS at 4 kg VS/m3 d). The residual methane potential of both digestates at all OLRs was less than 0.110 m3 CH4/kg VS, indicating efficient methanation in all cases. Use of acclimated inoculum allowed very rapid increases in OLR. Reactors fed on autoclaved FW showed lower ammonium and hydrogen sulphide concentrations, probably due to reduced protein hydrolysis as a result of formation of Maillard compounds. In the current study this reduced biodegradability appears to outweigh any benefit due to thermal hydrolysis of ligno-cellulosic components
food waste, anaerobic digestion, autoclave treatment, organic loading rate, nitrogen
1-8
Tampio, Elina
83849aed-14f1-4cb5-9d20-4c948be44481
Ervasti, Satu
b3dfb126-806e-44bd-9d7d-bbd8b07146a4
Paavola, Teija
438a8d03-83fc-43a8-8c93-c786ab19b7d0
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Rintala, Jukka
9cfde381-deb1-42cb-9d2b-e680fa97546f
2013
Tampio, Elina
83849aed-14f1-4cb5-9d20-4c948be44481
Ervasti, Satu
b3dfb126-806e-44bd-9d7d-bbd8b07146a4
Paavola, Teija
438a8d03-83fc-43a8-8c93-c786ab19b7d0
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Rintala, Jukka
9cfde381-deb1-42cb-9d2b-e680fa97546f
Tampio, Elina, Ervasti, Satu, Paavola, Teija, Heaven, Sonia, Banks, Charles and Rintala, Jukka
(2013)
Anaerobic digestion of autoclaved and untreated food waste.
Waste Management, .
(doi:10.1016/j.wasman.2013.10.024).
Abstract
Anaerobic digestion of autoclaved (160 °C, 6.2 bar) and untreated source segregated food waste (FW) was compared over 473 days in semi-continuously fed mesophilic reactors with trace elements supplementation, at organic loading rates (OLRs) of 2, 3, 4 and 6 kg volatile solids (VS)/m3 d. Methane yields at all OLR were 5–10% higher for untreated FW (maximum 0.483 ± 0.013 m3 CH4/kg VS at 3 kg VS/m3 d) than autoclaved FW (maximum 0.439 ± 0.020 m3 CH4/kg VS at 4 kg VS/m3 d). The residual methane potential of both digestates at all OLRs was less than 0.110 m3 CH4/kg VS, indicating efficient methanation in all cases. Use of acclimated inoculum allowed very rapid increases in OLR. Reactors fed on autoclaved FW showed lower ammonium and hydrogen sulphide concentrations, probably due to reduced protein hydrolysis as a result of formation of Maillard compounds. In the current study this reduced biodegradability appears to outweigh any benefit due to thermal hydrolysis of ligno-cellulosic components
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Published date: 2013
Keywords:
food waste, anaerobic digestion, autoclave treatment, organic loading rate, nitrogen
Organisations:
Water & Environmental Engineering Group
Identifiers
Local EPrints ID: 360069
URI: http://eprints.soton.ac.uk/id/eprint/360069
ISSN: 0956-053X
PURE UUID: 3183e79c-d96d-4cdc-a2c8-087b2a3bfe3b
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Date deposited: 25 Nov 2013 12:14
Last modified: 15 Mar 2024 02:52
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Contributors
Author:
Elina Tampio
Author:
Satu Ervasti
Author:
Teija Paavola
Author:
Jukka Rintala
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