20.500.12556/RUL-168327 Polyacrylic acid-based nanoplastics used in cosmetics a study of biodegradability and effects on heterotrophic and nitrifying microorganisms in the activated sludge Nanoplastics, commonly used in cosmetics, enter wastewater systems and interact with activated sludge, yet their effects on microorganisms, essential for wastewater treatment, remain poorly understood. The aim of this study was to investigate the effects of polyacrylic acid-based nanoplastics (PANPs) on microorganisms in activated sludge. The PANPs were characterized in terms of their material composition, size, zeta potential, and additive content. Acute (30 min) and prolonged (up to 6 h) toxicity tests were performed to evaluate negative effects on heterotrophic and nitrifying microorganisms in activated sludge. In addition, ready and inherent biodegradability tests were performed to assess their degradation in the environment and within wastewater treatment plants, respectively. The results showed a significant acute inhibition of heterotrophic and nitrifying activity (up to 55 and 72%, respectively) at the highest concentration tested (100 mg/L, 30 min), primarily attributed to the presence of 1-dodecanol detected in the PANPs. This effect decreased with prolonged exposure, likely due to the volatilization of 1-dodecanol. Nevertheless, the PANPs were found to be non-biodegradable in both the ready and inherent biodegradability tests. Although PANPs do not appear to pose a long-term threat to the activated sludge, their persistence in the environment raises concerns about possible accumulation. additives cosmetics microbial activity nanoparticles wastewater treatment water-soluble polymer aditivi kozmetika mikrobna aktivnost nanodelci čiščenje odpadne vode vodotopni polimeri true false true Angleški jezik Slovenski jezik Članek v reviji 2025-04-09 11:27:16 2025-04-09 11:27:17 2025-04-10 04:12:57 0000-00-00 00:00:00 2025 0 0 Str. 626-638 iss. 5 Vol. 91 1 Mar. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2025-03-01 504.5:678.744.32:620.3 0273-1223 10.2166/wst.2025.034 231923459 RAZ_Mederer_Bernardette_2025.pdf RAZ_Mederer_Bernardette_2025.pdf 1 C2DEC2592FD0AAEF7B49CCB21BE67418 96f990d6de27e4c3cc7e2f9e0ac7e070a87823bc17549ef4153c6e0539796ef7 3611292d-1524-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201600 https://iwaponline.com/wst/article/91/5/626/107493/Polyacrylic-acid-based-nanoplastics-used-in 1 bf6ad714-1523-11f0-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=201596 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0