Anaerobic digestion of microalgal biomass after ultrasound pretreatment

Passos, Fabiana, Astals, Sergi and Ferrer, Ivet (2014) Anaerobic digestion of microalgal biomass after ultrasound pretreatment. Waste Management, 34 11: 2098-2103. doi:10.1016/j.wasman.2014.06.004

Author Passos, Fabiana
Astals, Sergi
Ferrer, Ivet
Title Anaerobic digestion of microalgal biomass after ultrasound pretreatment
Journal name Waste Management   Check publisher's open access policy
ISSN 0956-053X
Publication date 2014-01-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.wasman.2014.06.004
Open Access Status Not yet assessed
Volume 34
Issue 11
Start page 2098
End page 2103
Total pages 6
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Subject 2311 Waste Management and Disposal
2700 Medicine
Abstract High rate algal ponds are an economic and sustainable alternative for wastewater treatment, where microalgae and bacteria grow in symbiosis removing organic matter and nutrients. Microalgal biomass produced in these systems can be valorised through anaerobic digestion. However, microalgae anaerobic biodegradability is limited by the complex cell wall structure and therefore a pretreatment step may be required to improve the methane yield. In this study, ultrasound pretreatment at a range of applied specific energy (16-67. MJ/kg. TS) was investigated prior to microalgae anaerobic digestion. Experiments showed how organic matter solubilisation (16-100%), hydrolysis rate (25-56%) and methane yield (6-33%) were improved as the pretreatment intensity increased. Mathematical modelling revealed that ultrasonication had a higher effect on the methane yield than on the hydrolysis rate. A preliminary energy assessment indicated that the methane yield increase was not high enough as to compensate the electricity requirement of ultrasonication without biomass dewatering (8% VS).
Keyword Algae
Anaerobic biodegradability
High rate algal pond
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID LP100200616
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Advanced Water Management Centre Publications
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Created: Fri, 08 Aug 2014, 21:22:04 EST by Sergi Astals-garcia on behalf of Advanced Water Management Centre