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  • Enhanced hydrogen accumulation from waste activated sludge by combining ultrasonic and free nitrous acid pretreatment: Performance, mechanism, and implication

    Author(s)
    Niu, Qianqian
    Xu, Qiuxiang
    Wang, Yali
    Wang, Dongbo
    Liu, Xuran
    Liu, Yiwen
    Wang, Qilin
    Ni, Bing-Jie
    Yang, Qi
    Li, Xiaoming
    Li, Hailong
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2019
    Metadata
    Show full item record
    Abstract
    This study presents a novel and effective method, i.e., adding nitrite into acidic fermentations after ultrasonic (US) pretreatment to form free nitrous acid (FNA), to further enhance hydrogen yield. Experimental results showed that when 180 mg/L nitrite was added into the US (2 W/mL, 15 min) pretreated waste activated sludge (WAS), the maximal hydrogen yield of 24.81 ± 1.24 mL/g VSS (volatile suspended solids) was obtained under acidic fermentation (1.0 mg/L FNA was initially formed under this condition), which was 2.21-folds (or 1.36-folds) of that from US pretreatment (or FNA treatment) alone. This combination approach ...
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    This study presents a novel and effective method, i.e., adding nitrite into acidic fermentations after ultrasonic (US) pretreatment to form free nitrous acid (FNA), to further enhance hydrogen yield. Experimental results showed that when 180 mg/L nitrite was added into the US (2 W/mL, 15 min) pretreated waste activated sludge (WAS), the maximal hydrogen yield of 24.81 ± 1.24 mL/g VSS (volatile suspended solids) was obtained under acidic fermentation (1.0 mg/L FNA was initially formed under this condition), which was 2.21-folds (or 1.36-folds) of that from US pretreatment (or FNA treatment) alone. This combination approach caused a positive synergy on sludge disintegration and enhanced the transformation of the released organics from non-biodegradable to biodegradable. Further study showed that the inhibiting effect of this combination method on hydrogen consuming microorganism was severer. Considering its pollution free, this combination strategy is an attractive technology for hydrogen recovery from WAS.
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    Journal Title
    Bioresource Technology
    Volume
    285
    DOI
    https://doi.org/10.1016/j.biortech.2019.121363
    Subject
    Environmental engineering
    Publication URI
    http://hdl.handle.net/10072/386140
    Collection
    • Journal articles

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