오존 산화에 의한 폐수함유 4-클로로페놀 및 휴믹산의 분해 반응과 전이금속성 이온의 영향

Abstract

The oxidative degradation characteristics of refractory organic and natural organic matter by ozone have been investigated along with the influence of transition metal ionic additives on the oxidation reaction. Under the experimental conditions, the degradation of 4-chlorophenol was rapidly accomplished within the initial 5minutes and it reached equilibrium state after ca. 30minutes. As the ozone input was increased, the degraded amount of 4-chlorophenol was enhanced, which resulting in the raised lapse of time for equilibrium state. Similar degradation features were also observed when metal ionic species were added to solution and their effectiveness was examined to be influenced by the input amount of ozone. The degradation characteristics of humic acid was found to be generally similar to that of 4-chlorophenol and due to its high molecular weight the degradation of humic acid was retarded compared with 4-chlorophenol. Humic acid was more significantly affected in its degradation by the co-existence of metal ionic additives than was 4-chlorophenol and, especially the effects of Cu and Fe+Cu additive on the degradation reaction were found to be considerable. Organic derivatives which containing carbonyl groups were observed as the intermediate products of oxidative degradation of 4-chlorophenol and the oxidative decomposition of 4-chlorophenol and humic acid was found to follow 2nd order reaction.