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Title: Exploring the potential of co-fermenting sewage sludge and lipids in a resource recovery scenario
Author: Peces, Miriam
Pozo, Guillermo
Koch, Konrad
Dosta Parras, Joan
Astals Garcia, Sergi
Keywords: Digestió anaeròbia
Olis i greixos
Anaerobic digestion
Oils and fats
Issue Date: 6-Dec-2019
Publisher: Elsevier B.V.
Abstract: In this study, co-fermentation of primary sludge (PS) or waste activated sludge (WAS) with lipids was explored to improve volatile fatty acid production. PS and WAS were used as base substrate to facilitate lipid fermentation at 20 °C under semi-aerobic conditions. Mono-fermentation tests showed higher VFA yields for PS (32-89 mgCOD gVS-1) than for WAS (20-41 mgCOD gVS-1) where propionate production was favoured. The principal component analysis showed that the base substrate had a notable influence on co-fermentation yields and profile. Co-fermentation with WAS resulted in a greater extent of oleic acid degradation (up to 4.7%) and evidence of chain elongation producing valerate. The occurrence of chain elongation suggests that co-fermentation can be engineered to favour medium-chain fatty acids without the addition of external commodity chemicals. BMP tests showed that neither mono-fermentation nor co-fermentation had an impact on downstream anaerobic digestion.
Note: Versió postprint del document publicat a:
It is part of: Bioresource Technology, 2019, vol. 300, p. 122561
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ISSN: 0960-8524
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)
Publicacions de projectes de recerca finançats per la UE

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