Authors
Qiqi Dong, Qiuxiang Xu, Haiyang Zhang, Dongyi Li, Esaïe Kouadio Appiah Kouassi, Kouassi Benjamin Yao, Patrick Drogui, Rajeshwar D Tyagi, Jiamin Zhang, Jonathan W C Wong
Published in
Bioresource technology. Pages 136056. Oct 12, 2026. Epub Oct 12, 2026.
Abstract
Chemical oxidation pretreatments are potent facilitators of short-chain fatty acids (SCFAs) production, yet the high dosages typically required escalate operational expenses. This study demonstrates that trichloroisocyanuric acid (TCCA) acts as a highly effective oxidative pretreatment, delivering a maximum SCFAs concentration of 1454.4 mg COD/L (4.3-fold higher than the control) at a low dosage of 20 mg/g TS, less than 1/4 of the rate commonly needed for conventional oxidants. Mechanism investigation revealed that TCCA addition markedly enhanced waste activated sludge (WAS) disintegration by disrupting extracellular polymeric substances (EPS) and the cell envelope. This enhancement was most likely driven by the combined effects of radical oxidation, free chlorine species, and a decrease in pH. Assays using model compounds further showed that 20 mg/g TS TCCA stimulated the activity of SCFAs producers while suppressing the microbial activity associated with SCFAs consumption, thereby favoring SCFAs accumulation. Microbial community profiling unveiled that TCCA enriched hydrolytic and acidogenic bacteria (e.g., norank_f__JG30-KF-CM45). Functional gene analysis further highlighted the upregulation of glycolysis, amino acid metabolism and acetate metabolism within acidogenic metabolism in the 20 mg/g TS TCCA group. These findings not only extend the applicability of TCCA but also offer new insights into advancing low-dose oxidant strategies for WAS treatment and resource recovery.
PMID:
42863712
Bibliographic data and abstract were imported from PubMed on 13 Oct 2026.
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