- Effect of the Presence of Soil on the Ferrous Catalyzed Sodium Persulfate Oxidation of Naphthalene
- Han, Dai-Sung;Yun, Yeo-Bog;Ko, Seok-Oh;
- Department of Civil Engineering, Kyunghee University;Department of Civil Engineering, Kyunghee University;Department of Civil Engineering, Kyunghee University;
- 과황산나트륨과 제일철 촉매를 이용한 나프탈렌 산화 시 토양이 미치는 영향 평가
- 한대성;윤여복;고석오;
- 경희대학교 토목공학과;경희대학교 토목공학과;경희대학교 토목공학과;
Abstract
Batch tests were carried out to examine the influence of the presence of soil and Fe(II) sorption capacity of soil on the ferrous catalyzed sodium persulfate oxidation for the destruction of organic pollutants in the application of in-situ chemical oxidation. Laboratory column tests were also conducted to investigate the transport of oxidant and catalyst in contaminated groundwater. Test results proved that Fe(II) was adsorbed on soil surface, and thus soil behaved as a heterogeneous catalyst, enhancing the naphthalene removal rate up to 50%. Column tests that were conducted with and without dissolved Fe(II) showed that naphthalene removal ratio were 24% and 25%, respectively. The removal efficiency was not enhanced with dissolved Fe(II), since the dissolved Fe(II) flew out of the column as the oxidant progressively injected into the column saturated with Fe(II). It indicates that the injected oxidant could not interact with dissolved Fe(II). But target organic pollutant was degraded in soil column system, implying that sulfate radical was produced by the reaction of dissolved persulfate with Fe(II) adsorbed on soil.
Keywords: Persulfate;Sufate radical;ISCO;Adsorption;Soil column;
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