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Treatment of a wastewater from a pesticide manufacture by combined coagulation and Fenton oxidation |
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| Authors: | G. Pliego J. A. Zazo M. I. Pariente I. Rodríguez A. L. Petre P. Leton J. García |
| Affiliation: | 1. Chemical Engineering, University Autonoma of Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain 2. Chemical and Environmental Technology, Rey Juan Carlos University, C/Tulipán s/n, 28933, Móstoles, Spain 3. Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcalá, 28871, Alcalá de Henares, Madrid, Spain 4. Chemical Engineering, University Complutense of Madrid, Ciudad Universitaria, 28040, Madrid, Spain |
| Abstract: | The treatment of a non-biodegradable agrochemical wastewater has been studied by coupling of preliminary coagulation—flocculation step and further Fenton oxidation. High percentages of chemical oxygen demand (COD) removal (up to 58 %) were achieved in a first step using polyferric chloride as coagulant. This reduced significantly the amount of H2O2 required in the further Fenton oxidation. Using the stoichiometric amount relative to COD around 80 % of the remaining organic load was mineralized. The combined treatment allowed achieving the regional discharge limits of ecotoxicity at a cost substantially lower than the solution used so far where these wastewaters are managed as hazardous wastes. |
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