BOOK OF ABSTRACTS 159 IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 Friday, 28 August 2026 / Hall C NOM and Aquatic Systems SL81 Using LC-OCD Analyses to Provide Insights into Natural Organic Matter Removal During Artificial Infiltration and Adsorption of MC-LR on Activated Carbon Katarzyna Jaszczyszyn1, Joanna Jeż-Walkowiak1, Peter M. Huck2 1 Poznan University of Technology, Faculty of Environmental Engineering and Energy, 5 Piotrowo, 61-138 Poznan, Poland, katarzyna.jaszczyszyn@put.poznan.pl 2 University of Waterloo, NSERC Chair in Water Treatment, Department of Civil and Environmental Engineering, Waterloo, Ontario, Canada Natural organic matter (NOM) is a complex mixture of compounds that can substantially impact drinking water treatment processes, for example by diminishing the adsorption kinetics of micropollutants and contributing to membrane fouling. Conventional parameters, such as total organic carbon (TOC/DOC), provide quantitative data on total NOM, but don‘t reflect alterations in the composition of NOM that may occur as a result of varioius treatment processes. Liquid chromatography with organic carbon detection (LCOCD) analysis allows the quantification of NOM fractions, defined, in order of descending molecular weight, as: biopolymers (BP), humic substances (HS), building blocks (BB), low molecular weight acids (LMW-A), and neutrals (LMW-N). Understanding variations in the concentration of individual NOM fractions during treatment is very helpful for optimizing treatment techniques. This presentation summarizes research on changes in organic matter composition during two important processes: artificial infiltration (AI) of water from a surfacewater intake and the adsorption of microcystin-LR onto powdered activated carbon (PAC), using LC-OCD. Research on the artificial infiltration of water from the Warta River in Poland revealed a significant efficiency in the removal of organic matter, with the process revealing a high degree of selectivity. The average decrease in TOC was 47%, while the decrease in BOD5 reached 96%. A significant finding was the near-total elimination of the biopolymer fraction (average 97%), which can be an important contributor to membrane fouling. Humic compounds, conversely, demonstrated remarkable resistance to elimination during AI, with a decrease of merely 4.5%. The variation of the NOM fractions is also important for understanding MC-LR adsorption. As indicated by initial results presented by Jaszczyszyn et al. [1], during cyanobacterial blooms in two reservoirs in Canada, DOC concentrations increased by more than 40%, accompanied by a substantial rise in biopolymer content. LC-OCD analyses demonstrated allowed the conclusion that humic compounds directly compete with MC-LR for active
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