Methanogenic degradation of long-chain fatty acids associated with syntrophic microbial dynamics during thermophilic AnMBR treatment of lipid-rich dairy wastes
Rattachement africain : jp, hk, cn. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
• Methanogenic treatment of lipid-rich wastes was performed with thermophilic AnMBR. • A high lipid loading rate of 11.24 g lipid/L/d decreased CH 4 yield by 56.90 %. • LCFA accumulation resulted from reduced degradation and lower β-oxidation rates. • Proposed syntrophic partnerships played key role in LCFA degradation. Anaerobic membrane reactors (AnMBRs) have been applied to effectively treat dairy wastes because they can address the drawbacks of sludge flotation and biomass washout. However, when dairy wastes contain considerable proportion of lipids, any anaerobic systems will likely encounter challenges with long-chain fatty acid (LCFA) inhibition. In this study, a thermophilic AnMBR was operated to treat dairy processing wastewater (DPW) plus ice cream waste (ICW). To evaluate the impact of LCFAs, the lipid-rich ICW was gradually introduced at different levels (0, 5, 10, and 20 %) into the AnMBR, along with a stepwise increase in lipid loading rate (LLR) from 0.22 to 11.24 g lipid/L/d. The results of biomethanation revealed that the AnMBR could be successfully operated when the LLR was maintained at 5.73 g lipid/L/d with a lipid/VS ratio of 50.22 % in the feedstock. However, at ultra-high LLR of 11.24 g lipid/L/d (20 % ICW added), a significant inhibitory effect on methane yields was observed, resulting in a reduction of 56.90 %. Dynamic analysis of the LCFAs profiled that a lower degradation rate was an important factor contributing to LCFA accumulation, and the inhibition concentration of various LCFAs was identified. Based on microbial evolution and co-occurrence network results, potential syntrophic partnerships between LCFA-degrading bacteria and methanogens were proposed . The responsible enzyme genes in the LCFA-degrading, acetoclastic, and hydrogenotrophic methanogenic pathways played crucial roles in LCFA inhibition and degradation. These findings offer practical insights for the efficient methanogenic treatment of lipid-rich wastes.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Methanogenic degradation of long-chain fatty acids associated with syntrophic microbial dynamics during thermophilic AnMBR treatment of lipid-rich dairy wastes
- Date Crossref
- 01/10/2024
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Tohoku University pays non établi dans la noticeUniversité ou école supérieure
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University of Hong Kong Environmental Microbiome Engineering and Biotechnology Laboratory pays non établi dans la noticeUniversité ou école supérieure
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Tongji University pays non établi dans la noticeUniversité ou école supérieure
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State Key Laboratory of Pollution Control and Resource Reuse pays non établi dans la noticeStructure de recherche
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Xi'an University of Architecture and Technology pays non établi dans la noticeUniversité ou école supérieure
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Qingdao Binhai University pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Engineering Department of Civil and Environmental Engineering pays non établi dans la noticeUniversité ou école supérieure
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College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource Reuse pays non établi dans la noticeUniversité ou école supérieure
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Graduate School of Environmental Studies Department of Frontier Science for Advanced Environment pays non établi dans la noticeUniversité ou école supérieure
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School of Environmental and Municipal Engineering Key Lab of Environmental Engineering (Shaanxi Province) pays non établi dans la noticeUniversité ou école supérieure
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School of Environmental Science and Engineering pays non établi dans la noticeUniversité ou école supérieure
Tohoku University, Environmental Microbiome Engineering and Biotechnology Laboratory — University of Hong Kong et Tongji University, avec 8 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.