Mechanistic elucidation of ultraviolet light and peracetic acid coupling-driven enhancements in short-chain fatty acid production from sludge: Reactive species-induced organic solubilization and microbial function regulation - Publication - Bridge of Knowledge

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Mechanistic elucidation of ultraviolet light and peracetic acid coupling-driven enhancements in short-chain fatty acid production from sludge: Reactive species-induced organic solubilization and microbial function regulation

Abstract

This study investigates the potential of enhancing short-chain fatty acid (SCFA) production during anaerobic fermentation of waste activated sludge through ultraviolet (UV) and peracetic acid (PAA) treatment. Under optimal conditions (UV irradiation time = 60 min and PAA dosage = 0.03 g/g VSS (volatile suspended solids), UV/PAA pretreatment enhanced sludge solubility, improved the biodegradability of organic matter, and facilitated pollutant degradation. During anaerobic fermentation, UV/PAA treatment resulted in an 836 % increase in SCFA production and a 50 % higher acetic acid ratio compared to the control group. Mechanistic studies revealed that UV/PAA treatment promoted sludge decomposition and enhanced the biodegradability of dissolved organic matter by generating more reactive species (•OH, CH3C(O)O•, •O2−, and 1O2), thereby facilitating sludge hydrolysis and acidification. Additionally, UV/PAA treatment increased the abundance of hydrolytic and SCFA-producing bacteria while reducing the abundance of SCFA-consuming bacteria. Moreover, UV/PAA treatment stimulated the expression of key enzyme genes involved in organic matter hydrolysis and SCFA production, thereby promoting SCFA accumulation. Therefore, UV/PAA treatment is promising in sludge treatment and provides a new approach for resource recovery from sludge.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
JOURNAL OF ENVIRONMENTAL MANAGEMENT no. 385,
ISSN: 0301-4797
Language:
English
Publication year:
2025
Bibliographic description:
Zhang A., Shen Z., Ding Y., Jiang N., Xu X., He J., Wang L., Gao P.: Mechanistic elucidation of ultraviolet light and peracetic acid coupling-driven enhancements in short-chain fatty acid production from sludge: Reactive species-induced organic solubilization and microbial function regulation// JOURNAL OF ENVIRONMENTAL MANAGEMENT -, (2025), s.125700-
DOI:
Digital Object Identifier (open in new tab) 10.1016/j.jenvman.2025.125700
Sources of funding:
  • This work was completed by the financial support of the National Natural Science Foundation of China [52270062], Shanghai Rising-Star Program [23QC1400800], Natural Science Foundation of Shanghai [22ZR1402800].
Verified by:
Gdańsk University of Technology

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