| Title |
Changes in characteristics of organic matter by preoxidation process for water treatment |
| Authors |
이승룡(Seung Ryong Lee),한명수(Chul Woo Jung),박갑성(Lim Seok Kang) |
| Abstract |
Optimum conditions of coagulation of organic matters in raw water were found to be ozone contact time of 3min, ozone dosages of 0.5㎎ O₃/㎎ TOC, and coagulant dosage of 0.15mM as AI. In addition, preozonation was used as an aid to removal of UV_(254), DOC at optimum condition of coagulant dosage. Hydrophobic fractions were transformed into hydrophilic fraction by ozonation, more DOC. THMs and THMFP were removed by only ozonation than by combination of chlorination and ozonation. From the results of the batch experiments under different oxidation methods, oxidation potential in combination of chlorine and ozone was decreased with increasing chlorine dosages. Because the ozone reacts with free aqueous chlorine present as hypochlorite ion(OCl^-), preozonation could not improve the removal of organics in the water treatment processes in the presence of chlorine. |