AI Article Synopsis
- - The study investigates how Methanosarcina thermophila bioaugmentation on biochar can improve biomethane production from food waste during anaerobic digestion and looks at how long these benefits last.
- - In a semi-continuous thermophilic setup, researchers found that keeping the solids retention time helped maintain high methane yields for 17 days by reducing washout effects.
- - Further experiments revealed that adding liquid soluble supplements is crucial for sustaining the positive effects of biochar, with findings suggesting the enhancement is mainly driven by microbial interactions rather than chemical properties.
Article Abstract
Methanosarcina thermophila bioaugmentation on biochar as the growth support particle has previously been shown to enhance biomethane production of anaerobic digestion of food waste. In this paper, the duration of the beneficial effects is examined by a semi-continuous thermophilic regime starting from pooled digestate from a previous batch digestion. An additional experiment is performed to decouple the solids retention time, mitigating the washout effect and resulting in improved methane yield for 17 days. The second experiment is extended incorporating various permutations of biochar amendment, and the findings suggest that liquid soluble supplements are essential for prolonging the advantages. Experimental and microbiological analyses indicate that the biochar's enhancement is likely due to microbial factors like direct interspecies electron transfer (DIET) or syntrophic interactions, rather than physicochemical mechanisms.
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| http://dx.doi.org/10.1016/j.jenvman.2024.122869 | DOI Listing |
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