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Electro-oxidation process assisted by solar energy for the treatment of wastewater with high salinity.

Authors
  • Salmerón, I1
  • Oller, I2
  • Malato, S1
  • 1 Plataforma Solar de Almería-CIEMAT, Carretera de Senés Km 4, 04200 Tabernas, Almería, Spain; CIESOL, Joint Centre of the University of Almería-CIEMAT, 04120 Almería, Spain. , (Spain)
  • 2 Plataforma Solar de Almería-CIEMAT, Carretera de Senés Km 4, 04200 Tabernas, Almería, Spain; CIESOL, Joint Centre of the University of Almería-CIEMAT, 04120 Almería, Spain. Electronic address: [email protected] , (Spain)
Type
Published Article
Journal
The Science of the total environment
Publication Date
Feb 25, 2020
Volume
705
Pages
135831–135831
Identifiers
DOI: 10.1016/j.scitotenv.2019.135831
PMID: 31818565
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Industrial wastewaters characterized by its high content in organics and conductivity entails a challenge for conventional treatments due to its low biodegradability. Electro-oxidative processes have been successfully applied for the treatment of this kind of wastewaters achieving high organics and ammonia removal. The degradation process is executed mainly by electrochemically generated active chlorine species, as HClO and ClO- with E0 = 1.49 V; and E0 = 0.89 V, respectively. Under solar radiation, specifically at 313 nm, the formation of Cl (E0 = 2.4 V) from ClO- is promoted, improving the oxidizing capacity of the process. In this work the combination of an electrochemical device with a solar photo-reactor has been evaluated aiming to increase the degradation rate per kWh-1. Two different complex industrial wastewaters were tested, achieving higher organics degradation when electrochemical treatment was assisted by solar light. Toxicity reduction was also assessed and biodegradability enhanced and allowing its ulterior lower-cost biological treatment. Copyright © 2019 Elsevier B.V. All rights reserved.

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