Photo-oxidation of cork manufacturing wastewater

• Type: Article in International Scientific Journal
• Date: 2004

Authors

Carla A. Silva (Author) Other; Luís M. Madeira (Author) FEUP; Rui A. Boaventura (Author) FEUP; Carlos A. Costa (Author) FEUP

Journal

Title: Chemosphere

Vol. 55 No. 1

Pages: 19-26

ISSN: 0045-6535

Publisher: Elsevier

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ISI Web of Knowledge - 29 Citations

ISI Web of Science

Scopus - 27 Citations

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Other information

Authenticus ID: P-000-AWS

DOI: 10.1016/j.chemosphere.2003.11.018

Abstract (EN): Several photo-activated processes have been investigated for oxidation of a cork manufacturing wastewater. A comparative activity study is made between different homogeneous (H2O2/UV-Vis and H2O2/Fe2+/UV-Vis) and heterogeneous (TiO2/UV-Vis and TiO2/H2O2/UV-ViS) systems, with degradation performances being evaluated in terms of total organic carbon (TOC) removal. Results obtained in a batch photo-reactor show that photo-catalysis with TiO2 is not suitable for this kind of wastewater while the H2O2/UV-Vis oxidation process, for which the effect of some operating conditions was investigated, allows to remove 39% of TOC after 4 h of operation (for C-H2O2 = 0.59 M, pH = 10 and T = 35 degreesC). The combined photo-activated process, i.e., using both TiO2 and H2O2, yields an overall TOC decrease of 46% (for C-TiO2 = 1.0 g l(-1)). The photo-Fenton process proved to be the most efficient, proceeds at a much higher oxidation rate and allows to achieve 66% mineralization in just 10 min of reaction time (for C-H2O2 = 0.31 M, T = 30 degreesC, Fe2+ :H2O2 = 0.12 (mol) and pH = 3.2).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8