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Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation

Author

Listed:
  • Hong Xiao

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
    These authors contributed equally to this work.)

  • Qing Liu

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
    These authors contributed equally to this work.)

  • Yingjun Wang

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China)

  • Ying Zhu

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China)

  • Dexin Fang

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China)

  • Ganxue Wu

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China)

  • Zhenxing Zeng

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China)

  • Hong Peng

    (College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China)

Abstract

Fe(II)-activated potassium periodate (KIO 4 ) oxidation was used to improve the dewaterability of waste-activated sludge for the first time. Compared with those of raw sludge, the capillary suction time (CST), specific resistance filtration (SRF), and water content of filter cake (W C ) of sludge treated using the Fe(II)/KIO 4 process under the optimal conditions (i.e., the initial pH = 6.8, KIO 4 dose = 1.4 mmol/g volatile suspended solids, Fe(II)/KIO 4 molar ratio = 1.2) decreased by 64.34%, 84.13%, and 6.69%, respectively. For conditioned sludge flocs, the Zeta potential and particle size were increased, and hydrophilic proteins in extracellular polymeric substances (EPS) were partly degraded, accompanied by the transformation of tightly bound EPS into soluble EPS and the conversion of dense sludge flocs into loose and porous ones. During Fe(II)/KIO 4 oxidation, Fe(IV) and the accompanying • OH were determined as the predominant reactive species and the underlying mechanism of sludge EPS degradation was proposed. This work provides a prospective method for conditioning the sludge dewaterability.

Suggested Citation

  • Hong Xiao & Qing Liu & Yingjun Wang & Ying Zhu & Dexin Fang & Ganxue Wu & Zhenxing Zeng & Hong Peng, 2022. "Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation," IJERPH, MDPI, vol. 19(22), pages 1-16, November.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:22:p:14726-:d:967627
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    Cited by:

    1. Tomasz Kamizela & Małgorzata Worwąg & Mariusz Kowalczyk, 2023. "Environmentally Safe Method for Conditioning and Dewatering Sewage Sludge Using Iron Coagulant, Cellulose and Perlite," Energies, MDPI, vol. 17(1), pages 1-21, December.

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