Enhanced dewaterability of waste-activated sludge with zero-valent iron-activated persulfate oxidation under mild hydrothermal conditions

A novel technique to enhance sludge dewaterability with zero-valent iron-activated persulfate (ZVI/PDS) and hydrothermal treatment (HT) under mild temperature is proposed in this study. Key operating parameters were considered to study their influences on the dewaterability of sludge. Comparative st...

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Bibliographic Details
Published in:Water science and technology 2022-02, Vol.85 (3), p.851-861
Main Authors: Li, Panpan, Yu, Yang, Zhu, Lixiang, Zhou, Zhanhang, Zhang, Wenjie, Wu, Peng, Yu, Ran
Format: Article
Language:English
Subjects:
Activated sludge
Chemical oxygen demand
Comparative analysis
Comparative studies
dewaterability
Dewatering
Efficiency
Energy consumption
Extracellular Polymeric Substance Matrix
extracellular polymeric substances
Extracellular polymers
Fourier transforms
Fulvic acids
Functional groups
Hydrothermal treatment
Iron
Organic matter
Oxidation
Oxidation-Reduction
persulfate
Raw sludge
Sewage
Sludge
Sludge drying
Spectrum analysis
Suction
Temperature
Viscosity
waste activated sludge
Waste Disposal, Fluid
Water
Water treatment
zero-valent iron
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Summary:A novel technique to enhance sludge dewaterability with zero-valent iron-activated persulfate (ZVI/PDS) and hydrothermal treatment (HT) under mild temperature is proposed in this study. Key operating parameters were considered to study their influences on the dewaterability of sludge. Comparative studies of organic matter, especially extracellular polymeric substances (EPS), were analyzed carefully to reveal the mechanisms involved. The results indicated that the specific resistance to filtration declined by 86.72%, and the capillary suction time reduced by 72.35% compared with the raw sludge under optimal conditions of 100 mg/g TSS ZVI and 200 mg/g TSS PDS doses at 120 °C. Soluble protein and fulvic acid-like in EPS were the key components affecting the sludge dewatering performance. The disappearance of the peak in the amide III led to a decrease in hydrophilic functional groups, which helped to improve sludge dewaterability.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2022.014