Insights into real cotton-textile dyeing wastewater treatment using solar advanced oxidation processes

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Petrick A. Soares (Author) FEUP; Tânia F. C. V. Silva (Author) FEUP; Diego R. Manenti (Author) FEUP; Selene M. A. G. U. Souza (Author) Other; Rui A. R. Boaventura (Author) FEUP; Vítor J. P. Vilar (Author) FEUP

Journal

Title: Environmental Science and Pollution Research

Vol. 21 No. 2

Pages: 932-945

ISSN: 0944-1344

Publisher: Springer Nature

Indexing

ISI Proceedings

ISI Web of Knowledge - 55 Citations

ISI Web of Science

Scopus - 78 Citations

Scientific classification

FOS: Engineering and technology > Environmental engineering

CORDIS: Technological sciences > Technology > Environmental technology

Associated Projects

LA 20 - Projeto Estratégico-LA 20 - 2011-2012

Other information

Authenticus ID: P-008-QGN

DOI: 10.1007/s11356-013-1934-0

Abstract (EN): Different advanced oxidation processes (AOPs) were applied to the treatment of a real cotton-textile dyeing wastewater as a pre-oxidation step to enhance the biodegradability of the recalcitrant compounds, which can be further oxidized using a biological process. Tests were conducted on a lab-scale prototype using artificial solar radiation and at pilot scale with compound parabolic collectors using natural solar radiation. The cotton-textile dyeing wastewater presents a lilac color, with a maximum absorbance peak at 641 nm, alkaline pH (pH = 8.2), moderate organic content (DOC = 152 mg C L-1, COD = 684 mg O-2 L-1) and low-moderate biodegradability (40 % after 28 days in Zahn-Wellens test). All the tested processes contributed to an effective decolorization and mineralization, but the most efficient process was the solar-photo-Fenton with an optimum catalyst concentration of 60 mg Fe2+ L-1, leading to 98.5 % decolorization and 85.5 % mineralization after less than 0.1 and 5.8 kJ(UV) L-1, respectively. In order to achieve a final wastewater with a COD below 250 mg O-2 L-1 (discharge limit into water bodies imposed by the Portuguese Legislation-Portaria no. 423/97 of 25 June 1997), considering the combination of a solar-photo-Fenton reaction with a biological process, the phototreatment energy required is 0.5 kJ(UV) L-1, consuming 7.5 mM hydrogen peroxide, resulting in 58.4 % of mineralization (t(30W) = 3.2 min; (T) over bar = 30.7 degrees C;(pH) over bar = 2.80; (UV) over bar (G,n) = 13 W m(-2)).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14