Application of Ce(IV) in industrial wastewater treatment

At present, rare earth application in wastewater treatment has become more and more widely, according to the fact that the Ce(IV) has the strong oxidation ability under acid condition, we have studied the application of Ce(IV) in industrial wastewater treatment originally. Results showed that oxidation-reduction reaction occurred between Ce(IV) and the organic compounds or other reducing substances in industrial wastewater, thereby the colority and CODcr reduced effectively. Ce(IV) formed [Ce(OH)x·nH2O](4-x)+ after hydrolyzation and Ce(III) obtained after Ce(IV) reduction formed [Ce(OH)x·nH2O](3-x)+ after hydrolyzation, these hydrate had big specific surface area, could adsorb the suspension substances and removed toxic or harmful ions in industrial wastewater. After treatment by Ce(IV), the analytical results of industrial wastewater are as follows: The CODcr became 58 mg/L from 1646 mg/L, the total COD removal efficiency was more than 95.0%. Turbidity reduced to no more than 10NTU from 87NTU. The chroma became 6 degree from 26 degree, suspension substances content decreased to no more than 2 mg/L from 36 mg/L, and total arsenic and fluorion became <0.05 mg/L and <0.10 mg/L from 0.60 and 15.3 mg/L. Total cadmium reduced to 0.01 mg/L from the 0.58 mg/L. These all indicated that Ce(IV) was one kind of latent good water treatment chemical.