IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 280 Poster Session / Research Frontiers Hall A P6.1 Removal of PFAS from Water Containing AOM Using Activated Biochar from Spent Coffee Grounds Sabína Macharová1, Lenka Čermáková1, Martin Pivokonský1 1 Institute of Hydrology of the Czech Academy of Sciences, Department of Hydrochemistry and Technology, Pod Paťankou 30/5, 160 00 Prague, macharova@ih.cas.cz Coffee is one of the most widely produced agricultural commodities and the second most traded product globally. As a result, large amounts of coffee waste are generated, a significant portion of which consists of spent coffee grounds (SCG) [1]. In this study, spent coffee grounds (SCG) served as the base material. The SCG were first pyrolyzed and subsequently activated using potassium hydroxide. The prepared material was then evaluated for the adsorption of perfluorooctanesulfonate (PFOS) [2]. PFOS is one of the most frequently detected per- and polyfluoroalkyl substances (PFAS) in various environmental compartments and has been associated with plastic pollution. PFAS exhibit exceptional chemical and thermal stability, which makes them highly persistent and resistant to degradation [3], [4]. Adsorption onto activated carbon is currently the most common approach for removing PFAS from water. This study focuses on the adsorption of PFOS onto activated SCG in distilled water and synthetic raw water spiked with algal organic matter (AOM) at DOC = 5-10mg/l. The adsorption performance was compared with a commonly used activated carbon in drinking water treatment plants in the Czech Republic, Filtrasorb TL830. In addition, the removal efficiency of PFOS was evaluated using a mixture of activated SCG and Filtrasorb TL830. Activated SCG exhibited lower adsorption efficiency compared to commercial activated carbon; however, the combined system showed comparable or slightly improved performance, indicating its potential use as a sustainable supplementary sorbent. These findings support the use of coffee waste as a sustainable material and encourage further investigation in real-world applications. References 1. N. Kondamudi, S.K. Mohapatra, M. Misra, Journal of Agricultural and Food Chemistry , 56 (2008) 11757. 2. H. Laksaci, A. Khelifi, M. Trari, A. Addoun, Journal of Cleaner Production 147 (2017) 254. 3. S.Y. Wee, A.Z. Aris, npj Clean Water 6 (2023) 57. 4. D. M. Wanninayak, Journal of Environmental Management 283 (2021) 111977. Acknowledgement This work was supported the Czech Academy of Sciences Praemium Academiae.
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