Photocatalytic detoxification with the thin-film fixed-bed reactor (TFFBR)

Clean-up of highly polluted landfill effluents using a novel TiO₂-photocatalyst

verfasst von

M. Bekbölet, M. Lindner, D. Weichgrebe, D. W. Bahnemann

Abstract

Two different photocatalysts, namely Hombikat UV100 (Sachtleben Chemie) and P25 (Degussa) have been used in batch experiments to compare their ability to degrade the toxic components of a biologically pretreated landfill leachate. A strong adsorption of the pollutant molecules was observed for both TiO₂-powders, with a maximum of almost 70% TOC reduction for Hombikat UV100, making it almost impossible to draw a quantitative comparison of the degradation with the two catalysts in the batch system. The photocalytic activity of Hombikat UV100 was also tested using a thin-film fixed-bed reactor (TFFBR) configuration under artificial solar UV-irradiation. Here the catalyst was fixed onto a glass-plate to avoid separation of the catalyst and water after the treatment. The highest degradation rate was observed at pH 5, using a moderately diluted waste water. In good agreement with the degradation rate's pH dependency adsorption measurements showed a maximum adsorption of the organic pollutants onto Hombikat UV 100 TiO₂ at pH 5. Photonic efficiencies (ζ) based on the amount of incident irradiation have been calculated for the experiments, ζ could be increased by a reduction of the light intensity. While the addition of H₂O₂ had an inhibiting effect (at pH 7), the presence of Na₂S₂O₈ led to a dark reaction. Studies performed under continuous recirculating conditions showed that even undiluted waste-water streams can, in principle, be degraded completely.

Externe Organisation(en)

Bogazici University
Institut für Solarenergieforschung GmbH (ISFH)
Technische Universität Clausthal

Typ

Artikel

Journal

Solar Energy

Band

56

Seiten

455-469

Anzahl der Seiten

15

ISSN

0038-092X

Publikationsdatum

05.1996

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Erneuerbare Energien, Nachhaltigkeit und Umwelt, Werkstoffwissenschaften (insg.)

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1016/0038-092X(96)00020-5 (Zugang: Geschlossen)