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Anaerobic digestion of microalgal biomass after ultrasound pretreatment

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10.1016/j.wasman.2014.06.004
 
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Passos, Fabiana Lopes del ReiMés informacióMés informació
Astals, Sergi
Ferrer Martí, IvetMés informacióMés informacióMés informació
Document typeArticle
Defense date2014-11-01
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
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).
CitationPassos , F.; Astals, S.; Ferrer, I. Anaerobic digestion of microalgal biomass after ultrasound pretreatment. "Waste management", 01 Novembre 2014, vol. 34, núm. 11, p. 2098-2103. 
URIhttp://hdl.handle.net/2117/25352
DOI10.1016/j.wasman.2014.06.004
ISSN0956-053X
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