Treatment of a wastewater from a pesticide manufacture by combined coagulation and Fenton oxidation.
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.
Chemical Engineering, University Autonoma of Madrid, Ctra. Colmenar km 15, 28049, Madrid, Spain, gema.pliego@uam.es.
G
G
Pliego
J A
JA
Zazo
M I
MI
Pariente
I
I
Rodríguez
A L
AL
Petre
P
P
Leton
J
J
García
D057919:Biological Oxygen Demand Analysis; D005427:Flocculation; D006861:Hydrogen Peroxide; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron; D010084:Oxidation-Reduction; D010575:Pesticides / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
D006861:Hydrogen Peroxide; D007220:Industrial Waste; D007501:Iron; D010575:Pesticides; D062065:Wastewater