Anaerobic co-digestion of lipid-spent microalgae with waste activated sludge and glycerol in batch mode. (May 2015)

• Record Type: Journal Article
• Authors: Neumann, P.; Torres, A.; Fermoso, F.G.; Borja, R.; Jeison, D.
• Is Part Of: International biodeterioration & biodegradation. Volume 100(2015)
• Page Start: 85
• Page End: 88
• Publication Date: 2015-05
• Subjects: Lipid spent microalgae -- Waste activated sludge -- Glycerol -- Co-digestion -- Biomethane; Biodegradation -- Periodicals; Bioremediation -- Periodicals; Biodegradation -- Periodicals; Biodégradation -- Périodiques; Biorestauration -- Périodiques; Electronic journals; 620.11223
• DOI: 10.1016/j.ibiod.2015.01.020
• Languages: English
• ISSNs: 0964-8305

Abstract

Abstract: Anaerobic co-digestion of lipid-spent Botryococcus braunii (LSBB) with waste activated sludge (WAS) and glycerol was studied. Different co-digestion mixtures were assessed in biochemical methane potential tests, performed at mesophilic temperature (35 °C). The experimental methane yields obtained were compared to theoretical values calculated from the methane individual yields. No significant increase in BMP was observed when mixing these substrates. A first-order exponential kinetic model was used to obtain the apparent kinetic constant of the processes assayed. The kinetic constant value of the mixture 25% WAS–75% LSBB was 116%, 16% and 43% higher than for WAS, LSBB and glycerol alone, respectively. Highlights: Co-digestion of lipid-spent microalgae with sewage sludge and glycerol was studied. Co-digestion did not induce significant increases in methane yield. Microalgae-sludge mixture at 3:1 ratio induced the highest CH4 production rate.