Remediation of Dioxins Contaminated Soil Using UV Radiations in Conjunction with Groundnut Oil
The effect of UV radiations and oil mediated UV radiations in removal of PCDDs and PCDFs congeners was studied. The effectiveness of photolytic degradation using groundnut oil was examined for removing tetra-, and octachlorinated congeners of dioxins and furans from contaminated soil by varying the intensity of UV radiation, exposure period and analyte concentration. All the four congeners tested were successfully degraded. The maximum removal of 50.61–62.3% of 2, 3, 7, 8-TCDD, 44.1–69.24% of 2, 3, 7, 8-TCDF, 35.0–56.03% of OCDD and 37.11–59.64% of OCDF was observed at an initial concentration of 2.5 and 5.0 ng g−1 respectively after an UV exposure period of 24 h. The dioxin congeners in the soil sample showed decrease in concentration with the increase in the exposure time and intensity of UV radiations. More degradation of dioxin was found when the samples were exposed for 34 h using 400 W of UV lamp. The rate of photocatalytic degradation of polychlorinated dioxins was found to decrease with the increase in number of chlorines.
KeywordsDioxins Soil contamination Degradation Groundnut oil
Authors are grateful to the Instrumentation Division, National Environmental Engineering Research Institute, Nagpur, India, for providing the facilities to perform the work.
Conflicts of Interest
The authors declare no conflict of interest.
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