title: Anaerobic co-digestion of pig manure and algae: impact of intracellular algal products recovery on co-digestion performance.
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 m(3) CH4 kg(-1)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.
authors: Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: S
authors: S
authors: Astals
authors: Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: R S
authors: RS
authors: Musenze
authors: School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: X
authors: X
authors: Bai
authors: Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia; School of Agriculture and Food Sciences, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: S
authors: S
authors: Tannock
authors: Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: S
authors: S
authors: Tait
authors: School of Chemical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia.
authors: S
authors: S
authors: Pratt
authors: Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia. Electronic address: p.jensen@awmc.uq.edu.au.
authors: P D
authors: PD
authors: Jensen
mesh_terms: D020418:Algal Proteins / Q000302:isolation & purification; D000693:Anaerobiosis; D000818:Animals; D018533:Biomass; D042541:Intracellular Space / Q000737:chemistry*; D008372:Manure / Q000032:analysis*; D008697:Methane / Q000096:biosynthesis; D008962:Models, Theoretical; D011134:Polysaccharides / Q000302:isolation & purification; D012037:Refuse Disposal / Q000379:methods*; D044444:Scenedesmus / Q000378:metabolism*; D034421:Sus scrofa
chemical_list: D020418:Algal Proteins; D008372:Manure; D011134:Polysaccharides; D008697:Methane
keywords: Anaerobic digestion; Biorefinery; Codigestion; Microalgae; Pre-treatment