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

Hong Xiao (), Qing Liu, Yingjun Wang, Ying Zhu, Dexin Fang, Ganxue Wu, Zhenxing Zeng and Hong Peng ()
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Hong Xiao: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
Qing Liu: College of Environmental Sciences, Sichuan Agricultural University, Chengdu 611130, China
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

IJERPH, 2022, vol. 19, issue 22, 1-16

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.

Keywords: sludge dewaterability; ferrous ion; potassium periodate; extracellular polymeric substances (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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