AI Article Synopsis
- The study explores how microbial communities can be adapted over time to efficiently produce medium chain fatty acids (MCFAs) from organic wastes, focusing on the role of hydrogen levels in this process.
- Key bacterial genera such as Caproiciproducens and Clostridium were identified as dominant players in the chain elongation process, indicating their importance for effective MCFA production.
- While increasing hydrogen levels can promote MCFA production initially, excessive hydrogen may ultimately hinder the process due to thermodynamic limitations and ethanol build-up.
Article Abstract
Medium chain fatty acids (MCFAs) production is a promising method for resource recovery from organic wastes. In this study, the microbial community structure shift along the long-term acclimation experiment and the concomitant effect of H level on chain elongation performance was investigated. Chain elongation microbiome could be rapidly acclimated from traditional anaerobic fermentation consortia. Genera Caproiciproducens, Clostridium sensu stricto 12, Rummeliibacillus and Oscillibacter was found to be dominant during the operation. The H was accumulated in the headspace by increasing the ethanol input, which inhibited oxidation of caproate and butyrate immediately, while its inhibition effect on chain elongation was delayed. H level in the headspace was positively correlated to the MCFAs production related bacteria. However, too much H accumulated might be suppressive for MCFAs production in the long term. It might result from the thermodynamic barrier for discarding excess reducing equivalents under high H level, which further gave rise to ethanol accumulation in this system.
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| http://dx.doi.org/10.1016/j.chemosphere.2023.138083 | DOI Listing |
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