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    Performance of UASB reactor treating waste activated sludge: Effect of electro-chemical disintegration on the anaerobic microbial population structure and abundance

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    Main article (1.060Mb)
    Date
    2022-10-31
    Author
    Emna, Feki
    Karray, Fatma
    Mhiri, Najla
    Battimelli, Audrey
    Sayadi, Sami
    Khoufi, Sonia
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    Abstract
    The electro-Fenton (EF) disintegration using iron electrodes was performed for the pretreatment of waste activated sludge (WAS). The effect of this electro-chemical pretreatment on anaerobic digestion (AD) performance and microbial population structure was studied. An improvement of biodegradability and bioaccessibility of organic matter was demonstrated. AD of pretreated WAS in an up-flow anaerobic sludge blanket reactor (UASB) resulted to an increase of biogas production by 60 % compared to control reactor without disintegration. PCR-DGGE and real-time qPCR analyses showed that the high abundance of bacteria and the coexistence of Coprothermobacter in the UASB digestate fed with disintegrated sample established a stable bacterial association which is in line with the AD performance. Besides, the increased number of methanogens along the process allowed the improvement of methane production in comparison to control reactor.
    URI
    https://www.sciencedirect.com/science/article/pii/S2214714422004640
    DOI/handle
    http://dx.doi.org/10.1016/j.jwpe.2022.103020
    http://hdl.handle.net/10576/33487
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