DRINKING WATER TREATMENT BY IN-SITU GENERATED FERRATE(VI)

The paper aims to investigate the efficiency of on-site produced ferrate for drinking water treatment and to examine the effect of ferrate on the performance of oxidation, disinfection, coagulation/flocculation-sedimentation. The study examined and validated the laboratory electrochemical production of ferrate and tested its treatment efficiency using Danube River water by Jar test apparatus and using both standard and scale down jar test procedures. The ferrate performance was compared with that of FeCISO4 and poly-aluminum chloride (PACI) in the laboratory scale. Total efficiency of water treatment was determined by removal efficiencies of turbidity, dissolved organic carbon, microbial count and trace organic micro pollutants. Major observations are that 0.5 mg/L dosage of ferrate as Fe will be sufficient enough to remove most of unwanted compounds; complete disinfection can be achieved with ferrate for the dosage no more than 0.5 mg/L irrespective of the stock solution and microbial count; ferrate has considerable oxidation potential to degrade common occurring trace organic micropollutants (other than melamine) by 40% in Danube river water. In contrast, FeCISO4 or PACI cannot remove any trace micro pollutants.