AI Article Synopsis
- The study investigated how different pretreatments affect methane production from microalgae biomass grown in pig manure, identifying that acid and basic treatments led to the highest solubilization of volatile solids.
- Alkali pretreatment yielded the highest methane production rate, while some treatments caused delays in biogas production, extending lag phases up to 9 days.
- Experiments focusing on pretreated solid phases decreased the lag phase to 2-3 days for alkali treatments, and the overall process was further analyzed using mathematical models to understand limiting factors, with a potential application of using digestate as biofertilizer.
Article 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 (377 mL CH/g SV) was achieved by alkali pretreatment. Nevertheless, some pretreatments inhibited biogas production and resulted in lag phases of 7-9 days. Hence, experiments using only the pretreated solid phase were performed, which resulted in a decrease in the lag phase to 2-3 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.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.biortech.2018.02.063 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!