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  • Enhanced short-chain fatty acids production from waste activated sludge by sophorolipid: Performance, mechanism, and implication

    Author(s)
    Xu, Qiuxiang
    Liu, Xuran
    Wang, Dongbo
    Liu, Yiwen
    Wang, Qilin
    Ni, Bing-Jie
    Li, Xiaoming
    Yang, Qi
    Li, Hailong
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2019
    Metadata
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    Abstract
    It was found in this study that the presence of sophorolipid (SL) enhanced the production of short-chain fatty acid (SCFA) from anaerobic fermentation of waste activated sludge (WAS). Experimental results showed that with an increase of SL addition from 0 to 0.1 g/g TSS, the maximal SCFA yield increased from 50.5 ± 4.9 to 246.2 ± 7.5 mg COD/g VSS. The presence of SL reduced the surface tension between hydrophobic organics and fermentation liquid, which thereby accelerated the disintegration of WAS and improved the biodegradability of the released organics. SL promoted the carbon/nitrogen ratio of the fermentation system, ...
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    It was found in this study that the presence of sophorolipid (SL) enhanced the production of short-chain fatty acid (SCFA) from anaerobic fermentation of waste activated sludge (WAS). Experimental results showed that with an increase of SL addition from 0 to 0.1 g/g TSS, the maximal SCFA yield increased from 50.5 ± 4.9 to 246.2 ± 7.5 mg COD/g VSS. The presence of SL reduced the surface tension between hydrophobic organics and fermentation liquid, which thereby accelerated the disintegration of WAS and improved the biodegradability of the released organics. SL promoted the carbon/nitrogen ratio of the fermentation system, enhancing the conversion of proteins in WAS. Moreover, SL suppressed severely the activities of methanogens, probably due to the drop of pH caused by SL addition. Amplicon sequencing analyses revealed that SL increased the abundance of hydrolytic microbes such as Bacteroides sp. and Macellibacteroides sp., and SCFA producers (e.g., Acinetobacter sp.).
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    Journal Title
    Bioresource Technology
    DOI
    https://doi.org/10.1016/j.biortech.2019.03.121
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Water treatment processes
    Environmental sciences
    Bacteriology
    Publication URI
    http://hdl.handle.net/10072/385635
    Collection
    • Journal articles

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