Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7067703 | Bioresource Technology | 2018 | 9 Pages |
Abstract
Methane production from pretreated and raw mixed microalgae biomass grown in pig manure was evaluated. Acid and basic pretreatments provided the highest volatile solids solubilisation (up to 81%) followed by alkaline-peroxide and ultrasounds (23%). Bead milling and steam explosion remarkably increased the methane production rate, although the highest yield (377â¯mL CH4/g SV) was achieved by alkali pretreatment. Nevertheless, some pretreatments inhibited biogas production and resulted in lag phases of 7-9â¯days. Hence, experiments using only the pretreated solid phase were performed, which resulted in a decrease in the lag phase to 2-3â¯days for the alkali pretreatment and slightly increased biomass biodegradability of few samples. The limiting step during the BMP test (hydrolysis or microbial inhibition) for each pretreatment was elucidated using the goodness of fitting to a first order or a Gompertz model. Finally, the use of digestate as biofertilizer was evaluated applying a biorefinery concept.
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Chemical Engineering
Process Chemistry and Technology
Authors
Judit MartÃn Juárez, Elena Riol Pastor, José M. Fernández Sevilla, Raúl Muñoz Torre, Pedro A. GarcÃa-Encina, Silvia Bolado RodrÃguez,