Anaerobic co-digestion of pig manure and algae: impact of intracellular algal products recovery on co-digestion performance

Astals, S. and Musenze, R. S. and Bai, X. and Tannock, S. and Tait, S. and Pratt, S. and Jensen, P. D. (2015) Anaerobic co-digestion of pig manure and algae: impact of intracellular algal products recovery on co-digestion performance. Bioresource Technology, 181. pp. 97-104. ISSN 0960-8524

Abstract

This paper investigates anaerobic co-digestion of pig manure and algae (Scenedesmus sp.) with and without extraction of intracellular algal co-products, with views towards the development of a biorefinery concept for lipid, protein and/or biogas production. Protein and/or lipids were extracted from Scenedesmus sp. using free nitrous acid pre-treatments and solvent-based Soxhlet extraction, respectively. Processing increased algae methane yield between 29% and 37% compared to raw algae (VS basis), but reduced the amount of algae available for digestion. Co-digestion experiments showed a synergy between pig manure and raw algae that increased raw algae methane yield from 0.163 to 0.245 m3 CH4 kg1 VS. No such synergy was observed when algal residues were co-digested with pig manure. Finally, experimental results were used to develop a high-level concept for an integrated biorefinery processing pig manure and onsite cultivated algae, evaluating methane production and co-product recovery per mass of pig manure entering the refinery.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 13 May 2019 04:13
Last Modified: 30 May 2019 02:18
Uncontrolled Keywords: anaerobic digestion, codigestion, microalgae, biorefinery, pre-treatment
Fields of Research : 09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Identification Number or DOI: 10.1016/j.biortech.2015.01.039
URI: http://eprints.usq.edu.au/id/eprint/36111

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