1. Application of a planar falling film reactor for decomposition and mineralization of methylene blue in the aqueous media via ozonation, Fenton, photocatalysis and non-thermal plasma: A comparative study.
- Author
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Mahyar, Ali, Miessner, Hans, Mueller, Siegfried, Kalass, Dieter, Moeller, Detlev, Hama Aziz, Kosar Hikmat, Khorshid, Ibrahim, and Rashid, Muhammad Amin M.
- Subjects
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OXIDATION , *COLOR removal (Sewage purification) , *MINERALIZATION , *DIELECTRIC devices , *FALLING films - Abstract
The efficiencies of ozonation and different advanced oxidation processes (AOPs) including photocatalytic ozonation, Fenton, photo-Fenton, photocatalytic oxidation, UVA/Ti02/H202, and non-thermal plasma generated by a dielectric barrier discharge (DBD) were compared in terms of the energy yield (G50) for decolorization of MB and total organic carbon (TOC) removal using a planar falling film reactor. Fenton oxidation and ozonation were found to be the most efficient methods for the decolorization of MB, although these techniques attained rather low mineralization. A combination treatment of the ozonation with the photocatalysis demonstrates a synergistic effect on the mineralization efficiency. The photocatalytic oxidation and UVA/Ti02/H202 provide only a moderate MB decolorization. The degradation efficiency of the DBD plasma is significantly dependent on the composition of gas atmosphere. The addition of Fe2+ to the solution in the DBD plasma under argon atmosphere improves the degradation efficiency due to the occurrence of Fenton reaction. The energy yield for 50% conversion of MB is calculated between 0.13 and 20.5 g/kWh, and the maximum and minimum values were obtained by the ozonation and photocatalytic oxidation, respectively. Ozonation with the highest energy yield provided a moderate mineralization by only 19%, while the DBD plasma obtained the highest TOC removal by 88%. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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