M.Sc. Tezi Görüntüleme

      In this study, the removal of copper, chromium and arsenic from chromated copper arsenate (CCA)-treated waste of yellow pine wood samples using ozone and peracetic acid was studied. The effect of solvent, wood size, concentrations of peracetic acid and ozone, and extraction time in peracetic acid and ozone on the amount of chromium, copper and arsenic removed by application of ozone after extracted in peracetic acid was determined. The amount of Cr+6 of the samples in remediation solvents was established. Some of the samples exposed to remediation were used thermogravimetric and SEM/EDX analysis. CCA treated sawdust (40mesh) was applied ozone for 15/30 minutes after having been extracted in five different concentrations (1%, 10%, 25%, 50%, 100%) at different times. It was found out that ozone application to the samples extracted in peracetic acid was not considerably effective on remediation. As for the remediation activity, increase in the amount of concentration extracted in peracetic acid and extraction time yielded positive results, to be specific, 99% of arsenic, 99% of chromium, 98% of copper were removed from sawdust. When applied and extracted with ozone in 25% of peracetic acid for 6h, 98% of arsenic, 90% of chromium, 96% of copper was extracted from the samples. The amount of Cr+6 in remediation solvent at 80oC was much more than that of in room temperature; 99% of chromium was Cr+6.