This study aimed to predict volatile fatty acids (VFAs) production from SDBS-pretreated waste-activated sludge (WAS). A lab-scale continuous experiment was conducted at varying hydraulic retention times (HRTs) of 7 d to 1 d. The highest VFA yield considering the WAS biodegradability was 86.8 % based on COD at an HRT of 2 d, where the hydrolysis and acidogenesis showed the highest microbial activities. According to 16S rRNA gene analysis, the most abundant bacterial class and genus at an HRT of 2 d were Synergistia and Aminobacterium, respectively. Training regression (R) for TVFA and VFA yield was 0.9321 and 0.9679, respectively, verifying the efficiency of the ANN model in learning the relationship between the input variables and reactor performance. The prediction outcome was verified with R values of 0.9416 and 0.8906 for TVFA and VFA yield, respectively. These results would be useful in designing, operating, and controlling WAS treatment processes.
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| http://dx.doi.org/10.1016/j.biortech.2023.128629 | DOI Listing |
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Article Synopsis
- The study investigated how alkaline fermentation of lipid-rich waste can increase the production of volatile fatty acids (VFAs) by using sulfate to enhance the metabolic pathways for long-chain fatty acids (LCFAs).
- The results showed a significant increase in VFA yield (671.1 mg COD/g VSS), particularly under high lipid conditions, with effective conversion of LCFAs like oleic and linolenic acids through the β-oxidation pathway.
- The research also identified key genes and microbial groups involved in this process, suggesting new strategies for improving recycling of lipid waste and VFA production in anaerobic systems.
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