High pressure thermal hydrolysis as pre-treatment to increase the methane yield during anaerobic digestion of microalgae

Keymer, Philip, Ruffell, Ian, Pratt, Steven and Lant, Paul (2013) High pressure thermal hydrolysis as pre-treatment to increase the methane yield during anaerobic digestion of microalgae. Bioresource Technology, 131 128-133. doi:10.1016/j.biortech.2012.12.125


Author Keymer, Philip
Ruffell, Ian
Pratt, Steven
Lant, Paul
Title High pressure thermal hydrolysis as pre-treatment to increase the methane yield during anaerobic digestion of microalgae
Journal name Bioresource Technology   Check publisher's open access policy
ISSN 0960-8524
1873-2976
Publication date 2013-03-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.biortech.2012.12.125
Open Access Status DOI
Volume 131
Start page 128
End page 133
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Anaerobic digestion of algal biomass will be an essential component of algal biofuel production systems, yet the methane yield from digestion of algae is typically much lower than the theoretical potential. In this work, high pressure thermal hydrolysis (HPTH) is shown to enhance methane yield during algae digestion. HPTH pre-treatment was applied to both raw algae and algal residue resulting from lipid extraction. HPTH and even the lipid extraction process itself increased methane yield, by 81% and 33% respectively; in combination they increased yield by 110% over that of the raw algae (18 L CH4 g VS-1 substrate). HPTH had little effect on the rate of anaerobic digestion, however lipid extraction enhanced it by 33% over that for raw algae (0.21 day(-1)). Digestion resulted in solubilisation of nitrogen (and phosphorous to a lesser degree) in all cases, showing that there is potential for nutrient recycling for algal growth. (C) 2013 Elsevier Ltd. All rights reserved.
Formatted abstract
Anaerobic digestion of algal biomass will be an essential component of algal biofuel production systems, yet the methane yield from digestion of algae is typically much lower than the theoretical potential. In this work, high pressure thermal hydrolysis (HPTH) is shown to enhance methane yield during algae digestion. HPTH pre-treatment was applied to both raw algae and algal residue resulting from lipid extraction. HPTH and even the lipid extraction process itself increased methane yield, by 81% and 33% respectively; in combination they increased yield by 110% over that of the raw algae (18 L CH4 g VS−1 substrate). HPTH had little effect on the rate of anaerobic digestion, however lipid extraction enhanced it by 33% over that for raw algae (0.21 day−1). Digestion resulted in solubilisation of nitrogen (and phosphorous to a lesser degree) in all cases, showing that there is potential for nutrient recycling for algal growth.
Keyword High pressure thermal hydrolysis
Anaerobic digestion
Microalgae
Methane
Nutrients
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 25 December 2012

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2013 Collection
 
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Created: Thu, 28 Feb 2013, 20:02:20 EST by Mr Philip Keymer on behalf of School of Chemical Engineering