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http://dx.doi.org/10.5322/JESI.2022.31.8.677

Application of Photocatalytic Degradation for Efficient Treatment of Organic Matter in Landfill Leachate in Jeju Island  

Lee, Chang-Han (Department of Environmental Administration, Catholic University of Pusan)
Lee, Taek-Kwan (Hanpoong Construction Co. Ltd.)
Cho, Eun-Il (Department of Environmental Engineering, Jeju National University)
Kam, Sang-Kyu (Department of Environmental Engineering, Jeju National University)
Publication Information
Journal of Environmental Science International / v.31, no.8, 2022 , pp. 677-689 More about this Journal
Abstract
In order to photocatalytically treat organic matter (CODCr) and chromaticity effectively, chemical coagulation and sedimentation processes were employed as a pretreatment of the leachate produced from landfill in Jeju Island. This was performed using FeCl3·6H2O as a coagulant. For the treated leachate, UV/TiO2 and UV/TiO2/H2O2 systems were investigated, using 4 types of UV lamps, including an ozone lamp (24 W), TiO2 as a photocatalyst, and/or H2O2 as an initiator or inhibitor for photocatalytic degradation. In the chemical coagulation and sedimentation process using FeCl3·6H2O, optimum removal was achieved with an initial pH of 6, and a coagulant dosage of 2.0 g/L, culminating in the removal of 40% CODCr and 81% chromaticity. For the UV/TiO2 system utilizing an ozone lamp and 3 g/L of TiO2, the optimum condition was obtained at pH 5. However, the treated CODCr and chromaticity did not meet the emission standards (CODCr: 400 mg/L, chromaticity: 200 degrees) in a clean area. However, for a UV/TiO2/H2O2 system using 1.54 g/L of H2O2 in addition to the above optimum UV/TiO2 system, the results were 395 mg/L and 160 degrees, respectively, which were within the emission standard limits. The effect of the UV lamp on the removal of CODCr, and chromaticity of the leachate decreased in the order of ozone (24 W) lamp > 254 nm (24 W) lamp > ozone (14 W) lamp > 254 nm (14 W) lamp. Only CODCr and chromaticity treated with the ozone (24 W) lamp met the emission standards.
Keywords
Photocatalytic degradation; Landfill leachate; $COD_{Cr}$; Chromaticity; Chemical coagulation and sedimentation; UV/$TiO_2$ system; UV/$TiO_2$/$H_2O_2$ system;
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