Eawag - Swiss Federal Institute of Aquatic Science and Technology

Unsere Forschungsgruppen beschäftigen sich aus der ingenieurtechnischen Perspektive mit Problemen der Abwasserreinigung und Trinkwasseraufbereitung sowie dem Schutz der Wasserressourcen. Unser langfristiges Ziel ist es, nachhaltige Konzepte für Wasser- und Nährstoffkreisläufe in Siedlungen zu entwickeln.

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Die alternative Methode zur Beurteilung der Reinigungsleistung von Kleinkläranlagen von Berghütten mittels Kalium als Tracer wird derzeit durch Messungen in der Chamanna Cluozza und weiteren Berghütten validiert (Foto: Adobe Stock).

12 febbraio 2025 –

Die Bedingungen in Berghütten machen es oft schwierig und unverhältnismässig, die Vorgaben für die Abwasserreinigung zu erreichen. Ein neuer Ansatz zur Beurteilung der Reinigungsleistung könnte das ändern.

Britschgi, L., Wei, S., Proesl, A., Morgenroth, E., & Derlon, N. (2025). The critical role of flocs in nitrification in full-scale aerobic granular sludge-based WWTP. Water Research, 274, 123021 (13 pp.). doi:10.1016/j.watres.2024.123021, Institutional Repository

Furrer, V., Froemelt, A., Singer, H., & Ort, C. (2025). Source-specific dynamics of organic micropollutants in combined sewer overflows. Water Research, 279, 123416 (9 pp.). doi:10.1016/j.watres.2025.123416, Institutional Repository

Hu, Y., Morgenroth, E., & Jacquin, C. (2025). Online monitoring of greywater reuse system using excitation-emission matrix (EEM) and K-PARAFACs. Water Research, 268, 122604 (13 pp.). doi:10.1016/j.watres.2024.122604, Institutional Repository

A currently increasing interest in water reuse is met with the concern about water quality. Excitation-emission matrix (EEM) measurements, which are widely implemented in laboratory analysis, emerge as a promising tool for characterizing both microbial and chemical water qualities in the online monitoring of water reuse systems. However, the robustness of EEM measurements has been rarely validated in actual online monitoring campaigns where predictions are made for new samples independent of those used to establish EEM analysis models, including the popular parallel factor analysis (PARAFAC). In this study, two strategies of conducting PARAFAC were examined for the online monitoring of a greywater reuse system using two EEM datasets from two monitoring periods for model establishment and model testing respectively. With the first strategy that is commonly used in laboratory analyses, an entire EEM datasets from one period was used to establish one PARAFAC model, and the maximum fluorescence intensity (F_max) of a PARAFAC component was used to predict total cell count (TCC) in another period. However, under the disturbance of dissolved organic matter (DOM) fluorescence in the background, F_max gave unreliable predictions in model testing. To address this problem, a second and novel strategy was proposed using an EEM clustering and PARAFAC component shift mining technique. This unsupervised algorithm, named K-PARAFACs, automatically groups EEMs into K clusters and on each cluster establishes a cluster-specific PARAFAC model with distinct component shapes. With this method, multiple PARAFAC models were established on one EEM dataset, with each model representing samples with certain TCC ranges and DOM compositions. In model testing, these cluster-specific PARAFAC models served as EEM classifiers. A new sample was not characterized by F_max but by the cluster-specific model that best fitted the EEM signal of the sample with the least numerical error. The proposed strategy demonstrates its robustness by successfully predicting the TCC trend in test datasets. Our findings suggest that K-PARAFACs is a promising tool that enables robust qualitative monitoring of water reuse systems with background DOM variability.

Lauber, C., Ulrich, L., & Udert, K. (2025). Abwasserbehandlung auf Berghütten. Ein neuer Ansatz zur Leistungsbeurteilung. Aqua & Gas, 105(1), 52-56. , Institutional Repository

24.06.2025,

Ore 9:00

Lausanne

Elimination poussée de l'azote des eaux usées municipales

Cours d’approfondissement PEAK-VSA V60/25

04.12.2025,

Ore 9:00

Eawag Dübendorf

Emissionen von Reifenpartikeln und Auswirkungen auf die Umwelt

PEAK-Basiskurs B36/25

Ist ein Raumfahrtforschungs- programm, das die Entwicklung eines bioregenerativen Lebenserhaltungssystems für langfristige Raumfahrtmissionen und Weltraumwohnungen zum Beispiel auf dem Mars zum Ziel hat