Abstract

Iron compounds in the oxidation state (VI) have the advantage of being powerful antioxidants and bactericides, which explains their particular interest in water treatment.The aim of this work was to investigate the ability of inhibition of pathogenic microorganisms (Escherichia coli, Salmonella, Staphylococcus aureus, Bacillus sp., Pseudomonas sp., Enterococcus feacalis) by ferrate and for the first time, to evaluate their capacity to resist ferrate Na₂FeO₄ in order to optimize its concentration in specific conditions. The doses required to inhibit these microorganisms are respectively: 5 mg / l, 8 mg / l, 6 mg / l, 4.5 mg / l, 6.3 mg / l and 7.6 mg /l. The application to establish our results was made through the sanitation of water of the river Mehraz (Fez - Morocco). Because of the resistance of indigenous bacteria and the influence of different parameters, we optimized the concentration of Na₂FeO₄ to 30 mg /l.

Key words: Potassium Ferrate (VI), water sanitation, disinfection, coagulation,wastewater treatment, bactericidal.