Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/46307
Title: Detoxification of waters contaminated with phenol, formaldehyde and phenol-formaldehyde mixtures using a combination of biological treatments and advanced oxidation techniques
Authors: Ortega-Méndez, J. A. 
Melián, J. A.Herrera 
Araña, J. 
Doña Rodríguez, José Miguel 
Díaz, O. González 
Pérez Peña, Jesús 
UNESCO Clasification: 330811 Control de la contaminación del agua
Keywords: Detoxification
Phenol
Oxidation techniques
Issue Date: 2015
Publisher: 0926-3373
Project: Sistema Completo de Caracterización de la Relación Entre Composición, Estructura y Fotoactividad de Sólidos Sintéticos Con Aplicaciones Fotocatalíticas. 
Journal: Applied Catalysis B: Environmental 
Abstract: The detoxification process of waters contaminated with phenol, formaldehyde and phenol–formaldehyde mixtures was studied using advanced oxidation treatments (heterogeneous photocatalysis and Fenton), biological techniques (aerated biological and wetland reactors) and combinations of the two. It is shown that photocatalysis was efficient in the detoxification of concentrations below 50 mg L−1 of those compounds. Sample toxicity increased at higher concentrations due to the generated intermediates. Phenol–formaldehyde mixtures were impossible to detoxify by heterogeneous photocatalysis at any of the studied concentrations. Treatments using the Fenton reaction were able to degrade concentrations above 1000 mg L−1, though the use of a reagent such as peroxide makes it a costly technique. The efficiency of the biological aerated filter (BAF) mainly depended on initial concentration and toxicity, with removal rates of 3.08 and 0.26 g L−1 d−1 obtained for phenol and formaldehyde, respectively. Taking into account the results obtained for the treatment of complex phenol–formaldehyde mixtures, the best combination of techniques for the treatment of concentrations found in the industrial wastewater studied in this paper was the Fenton + BAF technique which was able to detoxify phenol–formaldehyde concentrations (1:1) of 1000 mg L−1.
URI: http://hdl.handle.net/10553/46307
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2014.07.032
Source: Applied Catalysis B: Environmental [ISSN 0926-3373], v. 163, p. 63-73
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