Photocatalytic ozonation in an immersion rotary body reactor for the removal of micro-pollutants

Abstract

Carrier-bound titanium dioxide catalysts were used in a photocatalytic ozonation reactor for the degradation of micro-pollutants in real wastewater. A photocatalytic immersion rotary body reactor with a 36-cm disk diameter was used, and was irradiated using UV-A light-emitting diodes. The rotating disks were covered with catalysts based on stainless steel grids coated with titanium dioxide. The dosing of ozone was carried out through the liquid phase via an external enrichment and a supply system transverse to the flow direction. The influence of irradiation power and ozone dose on the degradation rate for photocatalytic ozonation was investigated. In addition, the performance of the individual processes photocatalysis and ozonation were studied. The degradation kinetics of the parent compounds were determined using liquid chromatography tandem mass spectrometry. First-order kinetics were determined for photocatalysis and photocatalytic ozonation. A maximum reaction rate of the reactor was determined, which could be achieved by both photocatalysis and photocatalytic ozonation. At a dosage of 0.4 mg /mg DOC, the maximum reaction rate could be achieved using 75% of the irradiation power used for sole photocatalysis, allowing increases in the energetic efficiency of photocatalytic wastewater treatment processes. The process of photocatalytic ozonation is suitable to remove a wide spectrum of micro-pollutants from wastewater. mehr

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Titel	Photocatalytic ozonation in an immersion rotary body reactor for the removal of micro-pollutants
Medien	Water Science and Technology
Heft	1
Band	85
Verfasser	Simon Mehling, Prof. Dr. Tobias Schnabel, Jörg Londong
Seiten	S. 535-548
Veröffentlichungsdatum	10.12.2021
Zitation	Mehling, Simon; Schnabel, Tobias; Londong, Jörg (2021): Photocatalytic ozonation in an immersion rotary body reactor for the removal of micro-pollutants. Water Science and Technology 85 (1), S. 535-548. DOI: 10.2166/wst.2021.617