Influence of augmentation of biochar during anaerobic co-digestion of Chlorella vulgaris and cellulose
| Autor: | Louise A. Fletcher, A. John Blacker, Andrew B. Ross, Jessica Quintana-Najera |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
Environmental Engineering
Chlorella vulgaris Bioengineering Article chemistry.chemical_compound Bioreactors Biogas Biochar Microalgae Anaerobiosis Prospective Studies Food science Cellulose Waste Management and Disposal Renewable Energy Sustainability and the Environment General Medicine Factorial experiment chemistry Anaerobic co-digestion Biofuels Charcoal Digestate Digestion Methane Anaerobic exercise Pyrolysis Biomethane optimization |
| Zdroj: | Bioresource Technology |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/j.biortech.2021.126086 |
| Popis: | Highlights • Biochar addition improved biomethane yield particularly at less favourable ISR 0.5–0.9. • Biochar provided a buffering effect at lower ISR and C/N ratio. • Factorial regression model provided optimal anaerobic co-digestion conditions. • Biochar effect is highly dependent on the digestion conditions. The anaerobic co-digestion (AcoD) of microalgae is a prospective option for generating biomethane from renewable sources. This study investigates the effects of inoculum-to-substrate ratio (ISR), C/N ratio and biochar (BC) load on the AcoD of Chlorella vulgaris and cellulose. An initial augmentation of BC at ISR 0.5–0.9 and C/N ratio 10–30 offered a pH buffering effect and resulted in biomethane yields of 233–241 mL CH4/g VS, corresponding to 1.8–4.6 times the controls. BC addition ameliorated significantly AcoD, supporting the digestate stability at less favourable conditions. The effect of the process variables was further studied with a 23 factorial design and response optimisation. Under the design conditions, the variables had less influence over methane production. Higher ISRs and C/N ratios favoured AcoD, whereas increasing amounts of BC reduced biomethane yield but enhanced production rate. The factorial design highlighted the importance of BC-load on AcoD, establishing an optimum of 0.58 % (w/v). |
| Databáze: | OpenAIRE |
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