期刊
FUEL
卷 303, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.121276
关键词
Organic loading rate; Acidogenic fermentation; Microbial profiling; Immersed membrane bioreactor; Volatile fatty acids
资金
- Swedish Agency for Economic and Regional Growth through a European Regional Development Fund [20201656]
- Shaanxi introduced talent research funding, China [A279021901]
- Introduction of Talent Research Start-up fund [00700-Z101022001]
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province, China
- Mobility for Regional Excellence-2020 [RUN 2017-00771]
- European Union's Horizon 2020 Research and Innovation Programme under the Marie Skodowska-Curie grant [754412]
This study evaluated the microbial profiling of anaerobic digestion during the processing of sewage sludge and food waste to volatile fatty acids in an immersed membrane bioreactor with different organic loading rates. Firmicutes and Actinobacteria were dominant at specific OLR levels, while Clostridium and Lactobacillus genera were responsible for higher yields of acetate, butyrate, caproate, and lactate. The bacterial community was dominated by the Firmicutes phylum and Clostridium sp. W14A species, indicating a lower population of acetogenic bacteria associated with greater VFAs generation.
This study was designed to evaluate the microbial profiling of anaerobic digestion during the processing of sewage sludge and food waste to volatile fatty acids (VFAs) in an immersed membrane bioreactor (iMBR) operating with a distinct organic loading rate (OLR). The results indicated that Firmicutes (0.17-0.38) and Actinobacteria (0.20-0.32) phyla dominated in anaerobic digestion with OLRs of 4 and 8 g VS/L/d, while Firmicutes (0.04-0.08), Actinobacteria (0.03-0.08) and Proteobacteria (0.02) were more abundant with OLR of 6 and 10 g VS/L/d in the bioreactors. Subsequently, the abundance of the Clostridium and Lactobacillus genera were responsible for higher yields of acetate, butyrate, caproate and lactate. The species of Clostridium sp. W14A (0.04-0.06), Bacterium OL-1(0.01-0.30) and Lactobacillus mucosae (0.002-0.01) were rich for both OLR dosages. Additionally, network and redundancy analysis confirmed that Clostridium sp. W14A, Bacterium MS4 and Lactobacillus had significant correlations with the VFAs produced, such as acetate, butyrate, and caproate. Variation analysis also demonstrated an appreciable correlation between environmental factors and the bacterial community. Overall, this bacterial community was dominated by the Firmicutes (0.04-0.38) phylum and Clostridium sp. W14A (0.04-0.60) species, which is a clear indicator of a lower population of acetogenic bacteria associated with greater VFAs generation.
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