IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 214 Poster Session / NOM and Aquatic Systems Hall A upstream water treatment plant. TCAA exhibited higher concentrations and greater variability than DCAA, and more frequently exceeded the drinking water quality standard under rainfall conditions. Seasonal analysis indicated that DBPs concentrations were higher in spring and autumn than in summer. EEM analysis revealed that humic-like components were strongly correlated with DBPs concentrations, whereas proteinlike components had little influence, consistent with previous studies [3]. Furthermore, the upstream water treatment plant showed higher DOC concentrations and a greater proportion of humic substances, resulting in a higher TCAA formation potential. In contrast, the downstream water treatment plant exhibited lower DOC concentrations and DBPs concentrations. These findings suggest that increases in DOC concentration associated with rainfall, particularly the increase in humiclike components, are the dominant factors controlling DBPs. References 1. Sirivedhin, T., Kimberly, A. G, Water Research 39(6) (2005) p. 1025-1036. 2. Yang, X., Shang, C., Westerhoff, P., Water Research 41(6) (2007) p. 1193-1200. 3. Hu, J., Xiao, R., Zhang, R., Wu, Z., Jiang, F., Ye, C., Qu, R. and Chu, W., AQUA Water Infrastructure, Ecosystems and Society 73(3) (2024) p. 464486. Acknowledgement This work was supported in JSPS KAKENHI Grant Numbers 24K01016.
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