Solar photocatalysis of a recalcitrant coloured effluent from a wastewater treatment plant

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Vitor J. P. Vilar (Author) FEUP; Ana I. E. Gomes (Author) FEUP; Vanessa M. Ramos (Author) FEUP; Manuel I. Maldonado (Author) FEUP; Rui A. R. Boaventura (Author) Other

Journal

Title: Photochemical & Photobiological Sciences

Vol. 8

Pages: 691-698

ISSN: 1474-905X

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 16 Citations

ISI Web of Science

Scopus - 20 Citations

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

Authenticus ID: P-003-RM9

DOI: 10.1039/b817541a

Abstract (EN): A photocatalytic study of a coloured effluent from a wastewater treatment plant was carried out in a pilot plant using compound parabolic collectors (CPC) in order to find out the best conditions for colour removal, since the discharge limit for this parameter is not achieved after conventional wastewater treatment. The interaction between ultraviolet natural radiation and TiO(2) strongly enhanced the colour degradation rate. Different TiO(2) concentrations were tested and the optimum concentration achieved was 200 mg L(-1). The use of peroxydisulfate (S(2)O(8)(2-)) as an additional electron scavenger gave a noticeable effect on colour and dissolved organic carbon (DOC) removal due to the formation of additional powerful oxidant species (OH(center dot) and SO(4)(center dot-)). However, hydrogen peroxide (H(2)O(2)) as additional oxidant was more efficient on colour degradation than S(2)O(8)(2-). The amount of energy necessary for the same colour removal (C/C(0) 0.1) was 6, 14 and 80 kJ(UV) L(-1), respectively, for the following systems using sunlight: 200 mg L(-1) TiO(2) + 5 mM H(2)O(2), 200 mg L(-1) TiO(2) + 2 mMS(2)O(8)(2-) and 200 mg L(-1) TiO(2). The first-order kinetic constants (0.487, 0.207 and 0.053 L kJ(-1)) and initial degradation rates (32.1, 10.0 and 2.2 mg kJ(-1)) showed the same behaviour.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8