Zur Desinfektion von Wasser, insbesondere Trinkwasser, wurde die UV-Bestrahlung zwar schon Anfang dieses Jahrhunderts angewendet, aber durch die Methode der Chlorung verdraengt. Aufgrund der heutigen Belastung von Wasser mit unterschiedlichen Inhaltsstoffen ist das Interesse groesser an Verfahren, bei denen dem Wasser keine Stoffe zugesetzt werden muessen. Mit zwei verschiedenen UV-Desinfektionsanlagen wird untersucht, mit welchen Mindestbestrahlungsdosen eine ausreichende Desinfektion erreicht werden kann. Dies wird mit unterschiedlichen Bakterienstaemmen (z.B. E. coli, Legiomella Pneumophila), mit unterschiedlichen Waessern (Trinkwasser, Oberflaechenwasser) untersucht.
Climate-driven challenges probably increase disinfection in drinking water systems. Interactions between disinfectants and infrastructure materials remain understudied. This study quantifies the consumption of chlorine, the release of dissolved organic carbon (DOC), and the formation of regulated disinfection byproducts (DBPs) from 20 common materials: polymeric pipes, seals, fittings, epoxy resins, and cement mortar. The materials were pulverized to maximize the surface area and create a worst-case scenario. The results were compared with standardized migration tests. Chlorine depletion (>90%) was observed in the waters exposed to epoxy resins, seals, and cement. The formation of DBP, especially trichloromethane (TCM), exceeded 100 μg/L in samples of epoxy resins, cement, vulcanized fiber, and polyamide; TCM was detected in polyethylene pipe materials at concentrations between 5 and 18 μg/L. Increased temperatures enhanced DOC leaching and THM formation. Relations between DOC and DBP concentrations indicate material leachates as precursors. The results highlight the importance of material selection and testing for disinfected drinking water systems, providing critical insights for risk assessment, material certification, and regulatory development. ©2026 The Authors
The treatment with ultraviolet (UV) light is a well-known technique for water disinfection. Photodegradation by UV light is in discussion as measure for advanced water treatment that could provide a potential removal option for micropollutants. Micropollutants such as ingredients from personal care products are also present in grey water. Grey water gets increasingly attention as a source for water reuse. For that purpose it has to be treated. UV-treatment is an option. However, the knowledge on the fate of micropollutants within such a treatment is little. Therefore, we investigated the fate of the UV filters ethylhexyl methoxycinnamate (EHMC), and octocrylene (OCR) as for both UV filters the presence in grey water was reported. OCR as a single compound was investigated with regard to its degradation kinetics and possible photo-transformation products (photo-TPs). These results were compared with those of EHMC previously reported in literature. The mixture of the two UV filters was also investigated to reveal if mixture effects occur regarding the elimination of the UV filters and the formation of TPs. A medium pressure mercury vapor lamp (200-400 nm) was employed for photolysis. This study shows that OCR itself was eliminated below the limit of detection after 256 min and that photo-TPs were formed. The photolysis of the mixture demonstrated alterations of the degradation rates and patterns. Additional TPs were formed by the reaction of the UV filters or TPs with each other. The study shows that more attention should be paid to mixture-effects and mixture-TPs that may cause further follow-up effects. © 2019 Elsevier B.V. All rights reserved.