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  • A comparative study on denitrifying sludge granulation with different electron donors: Sulfide, thiosulfate and organics

    Author(s)
    Qian, Jin
    Wei, Li
    Wu, Yaoguo
    Wang, Qilin
    Fu, Xiaoying
    Zhang, Xiaochao
    Chang, Xing
    Wang, Lianlian
    Pei, Xiangjun
    Griffith University Author(s)
    Wang, Qilin
    Year published
    2017
    Metadata
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    Abstract
    A comparative study on denitrifying sludge granulation with different electron donors (sulfide, thiosulfate and organics) was carried out. Longer time was spent on sulfide-denitrifying granular sludge (DGS) cultivation (88 days) than thiosulfate- and organics-DGS cultivations (57 days). All the three DGS were characterized in terms of particle size distribution, sludge settling ability (indicated by sludge volume index and settling velocity), permeability (indicated by fractal dimension) and extracellular polymeric substances (EPS, including polysaccharide and protein) secretion. Sludge productions in the three DGS-reactors ...
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    A comparative study on denitrifying sludge granulation with different electron donors (sulfide, thiosulfate and organics) was carried out. Longer time was spent on sulfide-denitrifying granular sludge (DGS) cultivation (88 days) than thiosulfate- and organics-DGS cultivations (57 days). All the three DGS were characterized in terms of particle size distribution, sludge settling ability (indicated by sludge volume index and settling velocity), permeability (indicated by fractal dimension) and extracellular polymeric substances (EPS, including polysaccharide and protein) secretion. Sludge productions in the three DGS-reactors were also monitored. The key functional microorganisms in three granular reactors were revealed via high through-put pyrosequencing analysis. Batch tests were performed to measure the denitrification activities of each DGS, including both denitratation (NO3− → NO2−) and denitritation (NO2− → N2). We found that thiosulfate-driven denitrifying sludge granulation (TDDSG) should be the most efficient and compact technology for effective BNR in municipal wastewater treatment. The findings of this study suggests the TDDSG could further increase the nitrogen removal potential in an enhanced sulfur cycle-driven bioprocess for co-treatment of wet flue gas desulfurization wastes with fresh sewage depending on three short-cut biological reactions, including: 1) short-cut biological sulfur reduction (SO42−/SO32− → S2O32−); 2) thiosulfate-driven denitritation (S2O32− + NO2− → SO42− + N2↑); and 3) nitritation (NH4+ + O2 → NO2−).
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    Journal Title
    Chemosphere
    Volume
    186
    DOI
    https://doi.org/10.1016/j.chemosphere.2017.07.106
    Subject
    Environmentally sustainable engineering
    Global and planetary environmental engineering
    Publication URI
    http://hdl.handle.net/10072/348597
    Collection
    • Journal articles

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