Pretreatment of sludge with sodium iron chlorophyllin-H2O2 for enhanced biogas production during anaerobic digestion.
Environ Res
; 204(Pt C): 112223, 2022 03.
Article
em En
| MEDLINE
| ID: mdl-34688644
ABSTRACT
This study investigated a novel sodium iron chlorophyllin-H2O2 (SIC-H2O2) sludge pretreatment strategy before anaerobic digestion to enhance methane production. The efficiencies and mechanism of the proposed strategy to enhance sludge biodegradability were explored. The SIC-H2O2 pretreatment could enhance the oxidation performance for sludge floc disintegration to dissociate TB-EPS into S-EPS increased SCOD to 521.38â¯mg/L. The increase of solubilization and release of EPS with the pretreatment facilitate the biogas production at 702â¯Lâ¯kg-1 VS, which was 3-folds of the control and significantly higher than other pretreatments. The result of excitation-emission matrix and parallel factor (EEM-PARAFAC) analysis showed that the SIC-H2O2 pretreatment enhanced the dissociation of TB-EPS fractions, especially the protein-like and soluble microbial by-product-like substances. Electron paramagnetic resonance (EPR) results provided evidence for homolytic catalysis H2O2 for the generation OH and the production of high-valent (Por)FeIV(O) intermediates. Synergistic effects of reactive oxygen species (OH, H2O2 and /HO2) and (Por)FeIV(O) enhanced the EPS disintegration during SIC-H2O2 pretreatment. The mixed-acid type fermentation provided continuous VFAs supply under the enrichment of Chloroflexi and Actinobacteria and multiplication Methanosaeta also promoted methane production. This research provides a feasible pretreatment strategy increase sludge biodegradability and enhance biogas production in the anaerobic digestion process.
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MEDLINE
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Esgotos
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Biocombustíveis
Idioma:
En
Revista:
Environ Res
Ano de publicação:
2022
Tipo de documento:
Article