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  • Improved degradation of anaerobically digested sludge during post aerobic digestion using ultrasonic pretreatment

    Author(s)
    Song, Kang
    Xie, Guo-Jun
    Qian, Jin
    Bond, Philip L
    Wang, Dongbo
    Zhou, Beibei
    Liu, Yiqi
    Wang, Qilin
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2017
    Metadata
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    Abstract
    Aerobic digestion has been recently studied to further treat anaerobically digested sludge (ADS) at sewage treatment plants. However, the process, which is called post aerobic digestion (PAD), only achieves limited degradation of the ADS. Here, we present a new study using ultrasonic pretreatment to enhance full-scale ADS degradation during PAD. The experiments examined the aerobic digestion of ultrasonically pretreated ADS and untreated ADS using activated sludge as digesting sludge. The ADS was degraded by 28%, 35% and 44% within the 5 day PAD period, when pretreated ultrasonically (20 kHz, 10 min) at 25 W, 50 W and 100 ...
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    Aerobic digestion has been recently studied to further treat anaerobically digested sludge (ADS) at sewage treatment plants. However, the process, which is called post aerobic digestion (PAD), only achieves limited degradation of the ADS. Here, we present a new study using ultrasonic pretreatment to enhance full-scale ADS degradation during PAD. The experiments examined the aerobic digestion of ultrasonically pretreated ADS and untreated ADS using activated sludge as digesting sludge. The ADS was degraded by 28%, 35% and 44% within the 5 day PAD period, when pretreated ultrasonically (20 kHz, 10 min) at 25 W, 50 W and 100 W, respectively. In contrast, in the absence of prior sonication, the ADS was only degraded by 24% in the same PAD period. Increased inorganic nitrogen generation and increased percentage of dead cells occurred in the ultrasonically pretreated ADS, indicating that endogenous respiration resulted in the reduction of volatile solids. The ultrasonic pretreatment significantly improved the aerobic digestion efficiency, which resulted in higher ADS degradation. Additionally, we show that the ultrasonic pretreatment could be an economically favorable technology when the cost of sludge transport and disposal is above $55 per wet tonne.
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    Journal Title
    Environmental Science: Water Research & Technology
    Volume
    3
    DOI
    https://doi.org/10.1039/c7ew00051k
    Subject
    Other chemical sciences
    Civil engineering
    Environmental engineering
    Environmentally sustainable engineering
    Global and planetary environmental engineering
    Publication URI
    http://hdl.handle.net/10072/369045
    Collection
    • Journal articles

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