Treatment of a wastewater from a pesticide manufacture by combined coagulation and Fenton oxidation
2014
Pliego, G. | Zazo, J. A. | Pariente, M. I. | Rodríguez, I. | Petre, A. L. | Leton, P. | Garcia, J.
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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