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Enhancing acidogenic fermentation of waste activated sludge via urea hydrogen peroxide pretreatment: Performance and mechanisms.
- Source :
-
Bioresource Technology . Oct2023, Vol. 386, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- [Display omitted] • UHP pretreatment enhanced the production of SCFAs in WAS anaerobic fermentation. • UHP pretreatment contributed to WAS disintegration significantly. • UHP pretreatment facilitated the generation and transformation of intermediates. • OH, O 2 and urea were the major contributors to the increased WAS disintegration. • Functional microbials and genes related with acetate production were upregulated. Improving the anaerobic treatment performance of waste activated sludge (WAS) to achieve resource recovery is an indispensable requirement to reduce carbon emissions, minimize and stabilize biosolids. In this study, a novel strategy by using urea hydrogen peroxide (UHP) to enhance SCFAs production through accelerating WAS disintegration, degrading recalcitrant substances and alleviating competitive suppression of methanogens. The SCFAs production and acetate proportion rose from 436.9 mg COD/L and 31.3% to 3102.6 mg COD/L and 54.1%, respectively, when UHP grew from 0 to 80 mg/g TSS. Mechanism investigation revealed that OH, O 2 and urea were the major contributors to accelerate WAS disintegration with the sequence of OH> O 2 > urea. Function microbes related to acidification and genes associated with acetate production ([EC:2.3.1.8] and [EC:2.7.2.1]) were upregulated while genes encoding propionic acid production ([EC:6.4.1.3] and [EC:6.2.1.1]) were downregulated. These results raised the application prospects of UHP in WAS resource utilization. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 386
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 169832156
- Full Text :
- https://doi.org/10.1016/j.biortech.2023.129483