Treatment of a wastewater from a pesticide manufacture by combined coagulation and Fenton oxidation
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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.
KeywordsAdvanced oxidation processes Coagulation–flocculation Fenton process Phenol Aquatic toxicity
This work has been financed by the Dirección General de Universidades e Investigación de la Comunidad de Madrid, Research Network REMTAVARES (S0505/AMB-0395 and S2009/AMB-1588).
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