Use of Titanium Dioxide Reaction for Degradation of Chlorophenol

The use of titanium dioxide (tio2) reaction for degradation of chlorophenol (cp) has been investigated. initial tio2 concentration of 10 mg.l-1 and 40 minutes of reaction time was enough to eliminate 100 mg.l^-1 of cp from the wastewater. the bio-treatability of the solution (bod5/cod ratio) was improved from 0, for the untreated cp solution, to 0.18 (corresponding bod21/cod was 0.24). the pre-treated solution biodegradability enhancement was verified by performing biological oxidation for the pre-treated solutions. the biomass used in aerobic digestion is fresh activated sludge from municipal wastewater treatment plant. more than 80% of the total organic carbon (%toc) elimination was obtained by co-digestion of the pre-treated solution with wastewater. the hydraulic retention times used in the bioreactors were of the same order of magnitude of those used at domestic wastewater treatment plants; i.e., between 12 and 24 hours. kinetic studies based on pseudo-first order kinetics have also been carried out with the demonstration of constants to be ranged between 0.67 and 1.7 l.g tvss^-1.h^-1.