Electrochemistry promotion of Fe(â
¢)/Fe(â
¡) cycle for continuous activation of PAA for sludge disintegration: Performance and mechanism.
Environ Res
; 256: 119268, 2024 Sep 01.
Article
em En
| MEDLINE
| ID: mdl-38815721
ABSTRACT
In this study, electrochemistry was used to enhance the advanced oxidation of Fe(â
¡)/PAA (EC/Fe(â
¡)/PAA) to disintegrate waste activated sludge, and its performance and mechanism was compared with those of EC, PAA, EC/PAA and Fe(â
¡)/PAA. Results showed that the EC/Fe(â
¡)/PAA process effectively improved sludge disintegration and the concentrations of soluble chemical oxygen demand, polysaccharides and nucleic acids increased by 62.85%, 41.15% and 12.21%, respectively, compared to the Fe(â
¡)/PAA process. Mechanism analysis showed that the main active species produced in the EC/Fe(â
¡)/PAA process were â¢OH, R-O⢠and FeIVO2+. During the reaction process, sludge flocs were disrupted and particle size was reduced by the combined effects of active species oxidation, electrochemical oxidation and PAA oxidation. Furthermore, extracellular polymeric substances (EPS) was degraded, the conversion of TB-EPS to LB-EPS and S-EPS was promoted and the total protein and polysaccharide contents of EPS were increased. After sludge cells were disrupted, intracellular substances were released, causing an increase in nucleic acids, humic acids and fulvic acids in the supernatant, and resulting in sludge reduction. EC effectively accelerated the conversion of Fe(â
¢) to Fe(â
¡), which was conducive to the activation of PAA, while also enhancing the disintegration of EPS and sludge cells. This study provided an effective approach for the release of organic matter, offering significant benefits in sludge resource utilization.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Esgotos
Idioma:
En
Revista:
Environ Res
Ano de publicação:
2024
Tipo de documento:
Article
País de afiliação:
China
País de publicação:
Holanda