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

Xiao, Hong; Liu, Qing; Wang, Yingjun; Zhu, Ying; Fang, Dexin; Wu, Ganxue; Zeng, Zhenxing; Peng, Hong

doi:10.3390/ijerph192214726

Open AccessArticle

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

by

Hong Xiao

^*,†,

Qing Liu

^†,

Yingjun Wang

,

Ying Zhu

,

Dexin Fang

,

Ganxue Wu

,

Zhenxing Zeng

and

Hong Peng

^*

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

^*

Authors to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Int. J. Environ. Res. Public Health 2022, 19(22), 14726; https://doi.org/10.3390/ijerph192214726

Submission received: 18 October 2022 / Revised: 3 November 2022 / Accepted: 8 November 2022 / Published: 9 November 2022

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Abstract

Fe(II)-activated potassium periodate (KIO₄) 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)/KIO₄ process under the optimal conditions (i.e., the initial pH = 6.8, KIO₄ dose = 1.4 mmol/g volatile suspended solids, Fe(II)/KIO₄ 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)/KIO₄ 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.

Keywords: sludge dewaterability; ferrous ion; potassium periodate; extracellular polymeric substances

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MDPI and ACS Style

Xiao, H.; Liu, Q.; Wang, Y.; Zhu, Y.; Fang, D.; Wu, G.; Zeng, Z.; Peng, H. Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation. Int. J. Environ. Res. Public Health 2022, 19, 14726. https://doi.org/10.3390/ijerph192214726

AMA Style

Xiao H, Liu Q, Wang Y, Zhu Y, Fang D, Wu G, Zeng Z, Peng H. Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation. International Journal of Environmental Research and Public Health. 2022; 19(22):14726. https://doi.org/10.3390/ijerph192214726

Chicago/Turabian Style

Xiao, Hong, Qing Liu, Yingjun Wang, Ying Zhu, Dexin Fang, Ganxue Wu, Zhenxing Zeng, and Hong Peng. 2022. "Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation" International Journal of Environmental Research and Public Health 19, no. 22: 14726. https://doi.org/10.3390/ijerph192214726

APA Style

Xiao, H., Liu, Q., Wang, Y., Zhu, Y., Fang, D., Wu, G., Zeng, Z., & Peng, H. (2022). Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation. International Journal of Environmental Research and Public Health, 19(22), 14726. https://doi.org/10.3390/ijerph192214726

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

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