We used a conventional activated sludge process to treat a paper wastewater, and then the effluent was treated with an ozone oxidation process as advanced process to remove non-degradable materials. It was found that the removal efficiency rates of the organic matter has been rapidly increased initially, and then it was almost constant after this period. The concentration of ozone should be recommended to maintain approximately 8.3 mg/L during this operation to keep the CODmn value below 100 mg/L and ozone contact time longer than 60 min.

• 임봉수(대전대학교 환경공학과) | Bong-Su Lim
• 권충진(대전대학교 환경공학과) | Chung-Jin Kwon
• 김준영(대전대학교 환경공학과) | Joon-Young Kim
• 강아람(대전대학교 환경공학과) | A-Ram Kang