Photocatalytic Ozonation of Winery Wastewaters

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• 作者：Olga Gimeno ; F. Javier Rivas ; Fernando J. Beltrá ; n ; Marí ; a Carbajo
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2007
• 出版时间：November 28, 2007
• 年：2007
• 卷：55
• 期：24
• 页码：9944 - 9950
• 全文大小：469K
• 年卷期：v.55,no.24(November 28, 2007)
• ISSN：1520-5118

文摘

The combination of UV-A/vis radiation and ozone, in the presence of titanium dioxide, has been investigated as a potential destructive technology for the treatment of winery wastewaters. The contribution of the adsorption stage, single ozonation, photolytic ozonation, and photocatalysis has previously been assessed. Adsorption onto the TiO₂ surface accounts for a 15–20% removal of the initial chemical oxygen demand (COD). The rest of the subsystems attain COD conversion values in the range of 37–43%. The photocatalytic ozonation of the effluent, under the operating conditions investigated, increases the COD depletion to a value close to 80%. The working pH was studied in the range of 3–11, the optimum value being located in the acidic region (pH 3). A saturation-like behavior is experienced when the amount of TiO₂ used is varied in the interval of 0–3 g L⁻¹. Contrary to the use of ozone alone, the system UV-A/vis/O₃/TiO₂ leads to the total mineralization of the COD removed. A proposed pseudoempirical model suggested the existence of a synergistic effect when radiation, ozone, and titanium dioxide are combined.