Can the addition of biochar improve the performance of biogas digesters operated at 45°C?
| Autor: | Rudolf Markt, Andreas Wagner, Charles Mbohwa, Sebastian Hupfauf, S. O. Masebinu, Olufunto T. Fanoro, Heribert Insam |
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| Rok vydání: | 2021 |
| Předmět: |
Environmental Engineering
020209 energy 02 engineering and technology 010501 environmental sciences Pulp and paper industry 01 natural sciences Methane Anaerobic digestion chemistry.chemical_compound chemistry Biogas Biochar 0202 electrical engineering electronic engineering information engineering 0105 earth and related environmental sciences |
| Zdroj: | Environmental Engineering Research. 27:200648 |
| ISSN: | 2005-968X 1226-1025 |
| Popis: | Biogas from anaerobic digestion (AD) may contribute towards a green energy scene in the future. Despite many benefits, AD plant operators are still challenged by limitations of the technology. This study aimed at evaluating the effect of biochar addition to AD reactors operated at 45°C to optimize productivity, efficiency and stability of the process. Biochar is characterized by a large surface area and may therefore facilitate the creation of biofilms on the one hand and remove environmental contaminants on the other hand. Moreover, biochar may serve as pH control agent due to its alkaline properties, counteracting reactor acidification. Our results showed that the addition of biochar reduced efficiently the amount of H2S that initially occurred in the headspace during reactor start-up. Nevertheless, no impact on biogas- and methane yields was observed. This might be explained with an already well-working AD system without any severe disturbances, where the balancing nature of biochar did hardly count. Future studies, however, need to evaluate the effect on stressed systems. The microbiome analysis provided a detailed view of the microbial dynamics during the start-up phase, revealing Methanosarcina as dominant methanogen in the end. The addition of biochar did not alter the microbial community composition. |
| Databáze: | OpenAIRE |
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