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Impact of low temperature pretreatment on the anaerobic digestion of microalgal biomass

Authors
Journal
Bioresource Technology
0960-8524
Publisher
Elsevier
Volume
138
Identifiers
DOI: 10.1016/j.biortech.2013.03.114
Keywords
  • Microalgae
  • Biogas
  • Biofuel
  • High Rate Algal Pond
  • Wastewater

Abstract

Abstract The aim of this study was to investigate the effect of low temperature pretreatment on the anaerobic digestion of microalgal biomass grown in wastewater. To this end, microalgae were pretreated at low temperatures (55, 75 and 95°C) for 5, 10 and 15h. Biomass solubilisation was enhanced with the pretreatment temperature and exposure time up to 10h. The methane yield was improved by 14%, 53% and 62% at 55, 75 and 95°C, respectively; and was correlated with the solubilisation increase. The pretreatment at 95°C for 10h increased VS solubilisation by 1188%, the initial methane production rate by 90% and final methane yield by 60% compared to untreated microalgae. With diluted biomass (∼1% VS) positive energy balance was not likely to be attained. However, with concentrated biomass (>2% VS) energy requirements may be covered and even surplus energy generated.

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