Solar treatment of cork boiling and bleaching wastewaters in a pilot plant

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

Authors

Vitor J. P. Vilar (Author) FEUP; Manuel I. Maldonado (Author) Other; I. Oller (Author) Other; Sixto Malato (Author) Other; Rui A. R. Boaventura (Author) FEUP

Journal

Title: Water Research

Vol. 43

Pages: 4050-4062

ISSN: 0043-1354

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 33 Citations

ISI Web of Science

Scopus - 35 Citations

COMPENDEX

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

CORDIS: Technological sciences > Technology

Other information

Authenticus ID: P-003-GKN

DOI: 10.1016/j.watres.2009.06.019

Abstract (EN): This paper reports on cork boiling and bleaching wastewaters treatment by solar photocatalytic processes, TiO(2)/UV and Fe(2+)/H(2)O(2)/UV (TiO(2)-only for bleaching wastewater), in a pilot plant with compound parabolic collectors. The photo-Fenton reaction (k = 0.12 L/kJ(UV), r(0) = 59.4 mg/kJ(UV)) is much more efficient that TiO(2) photocatalysis and TiO(2) + S(2)O(8)(2-) (k = 0.0024 L/kJ(UV), r(0) = 1.36 mg/kJ(UV)), leading to 94% mineralization of the bleaching wastewater after 31.5 kJ(UV)/L, consuming 77.1 mM of H(2)O(2) (3.0 mmol/kJ(UV)) and using 20 mg/L of iron. For the cork boiling wastewater, after a slow initial reaction rate, the DOC degradation curve shows a first-order kinetics behaviour (k = 0.015 L/kJ(UV), r(0) = 20.8 mg/kJ(UV)) until 173 kJ(UV)/L (= 300 mg C/L). According to the average oxidation state (AOS), toxicity profiles, respirometry and kinetic results obtained in two solar CPCs plants, the optimal energy dose estimated for phototreatment to reach a biodegradable effluent is 15 kJ(UV)/L and 114 kJ(UV)/L, consuming 33 mM and 151 mM of H(2)OT:/PGN/ELSEVIER/WR/web/00007490/(2), achieving almost 49% and 48% mineralization of the wastewaters, respectively for the cork bleaching and boiling wastewaters.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13