Journal
ENVIRONMENTAL TECHNOLOGY
Volume 36, Issue 4, Pages 496-506Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2014.952676
Keywords
textile wastewater; experimental design; biodegradability; electrocoagulation; toxicity
Categories
Funding
- FEDER through COMPETE - Programa Operacional Factores de Competitividade [PEst-C/EQB/LA0020/2013, NORTE-07-0162-FEDER-000050]
- FCT - Fundacao para a Ciencia e a Tecnologia
- QREN
- ON2
- Araucaria Foundation-BR
- CNPq-BR
- CAPES-BR [BEX 9794/11-5, 5512/10-7]
- FCT Investigator Programme [IF/01501/2013]
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In this work, the application of an iron electrode-based electrocoagulation (EC) process on the treatment of a real textile wastewater (RTW) was investigated. In order to perform an efficient integration of the EC process with a biological oxidation one, an enhancement in the biodegradability and low toxicity of final compounds was sought. Optimal values of EC reactor operation parameters (pH, current density and electrolysis time) were achieved by applying a full factorial 3(3) experimental design. Biodegradability and toxicity assays were performed on treated RTW samples obtained at the optimal values of: pH of the solution (7.0), current density (142.9 A m(-2)) and different electrolysis times. As response variables for the biodegradability and toxicity assessment, the Zahn-Wellens test (D-t), the ratio values of dissolved organic carbon (DOC) relative to low-molecular-weight carboxylates anions (LMCA) and lethal concentration 50 (LC50) were used. According to the D-t, the DOC/LMCA ratio and LC50, an electrolysis time of 15 min along with the optimal values of pH and current density were suggested as suitable for a next stage of treatment based on a biological oxidation process.
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