New insights into extracellular polymeric substance degradation during dewaterability of sludge by UV-driven advanced reduction processes: Role of hydrated electron and spectroscopic profiling of dissolved organic components in sludge filtrate.

Autor: Priyanka KM; Department of Environmental and Water Resources Engineering, School of Civil Engineering, VIT, Vellore, Tamilnadu, India. Electronic address: priyanka.km2020@vitstudent.ac.in., Saravanakumar MP; Department of Environmental and Water Resources Engineering, School of Civil Engineering, VIT, Vellore, Tamilnadu, India. Electronic address: mpsaravanakumar@vit.ac.in.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Dec 07; Vol. 373, pp. 123583. Date of Electronic Publication: 2024 Dec 07.
DOI: 10.1016/j.jenvman.2024.123583
Abstrakt: Currently, Advanced Reduction Process (ARP) is gaining popularity as an alternative to Advanced Oxidation Process (AOP). Though UV/Sulfite process is effective in degrading organic compounds, no investigation has been done using ARP to improve sludge dewaterability. Here, effect of two different ARP's (UV/Sulfite; UV/Sulfide) that generates hydrated electron (e aq - ) and hydrogen atom (H•) in enhancing sludge dewatering was explored. Based on findings, alkaline pH was favourable for ARP's to improve sludge dewatering. At optimal conditions, CST value was 18 and 23.3 s for UV/Sulfite and UV/Sulfide with raw sludge exhibiting 100 s at pH-7.7 respectively. The mechanism revealed that e aq - was the dominant reducing radical along with H•, based on EPR spectra and quenching experiments. UV-Vis, Gaussian fitting, 3D EEM Fluorescence and Synchronous Fluorescence Spectroscopy exhibited higher release of organic matter and aromaticity which agrees with FTIR analysis. Emission peak around 330-380 nm in all samples exhibited Microbial Soluble Products and aromatic protein II.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Databáze: MEDLINE