The Effect of High pH and Hydrogen Peroxide on Ozonation of Humic Acid

Abstract

This study aimed to removal of dissolvel organic matter (DOC) from humic acid (HA) solution with high pH and with the addition of hydrogen peroxide (H₂O₂) by ozonation processes. The results were evaluated UV₂₅₄, SUVA₂₅₄ (Specific Ultraviole Absorbance at 254 nm), DOC that specify organic matter, Color₄₃₆. The effect of ozone concentration on HA removal was investigated between 5 to 20 mg/L at HA concentration of 30 mg/L and pH 6,5. The effect of H₂O₂ concentration was investigated 1 mg/l at ozone concentration of 10 mg/L, and pH 6,5. It was obtained that DOC, UV₂₅₄, Color₄₃₆ and SUVA₂₅₄ removal efficiency was 38,79%, 76,16%, 94,57% and 61,06% respectively at oxidation time of 60 min. Ozonation experiment was also performed at pH 11. It was obtained that DOC, UV₂₅₄, Color₄₃₆ and SUVA₂₅₄ removal efficiency was 56,43%, 80,54%, 96,90% and 55,32% respectively at oxidation time of 60 min. The results show that HA removal efficiency increased with the addition of hydrogen peroxide and at pH 11 by ozonation processes.