Removal of Sulfide in Effluent from Tannery by Photocatalytic Oxidation

Photocatalytic oxidationhas is very effective for removing organic pollutant, especially hard-degradating organic pollutant. Unhairing is a process which pruduces the most pollutants in tanning processes including noxious sulfide and a large number of protein hydrolysates. Removing sulfide in effulent under TiO2 by photocatalytic oxidadtion, and measuring of the concentration of sulfide with spectrophotometer were studied. It was showed that the degrease of sulfide concentration in samples was over 90% in 8 to 10 hours, and the degreasing of both sulfide and COD in effluent from tannery was about 50% and 70% respectively, in 7 hours.