Environmental standards solid waste processing

Another interesting application of the photocatalytic technology is the removal (more than 99%) of mercury from hazardous wastes of a chlor-alkali plant. The process begins by acid attack of the solid wastes and treatment of the acid solution under UV irradiation in the presence of Ti02 and citric acid. The selective precipitation of reduced mercury took place, while the other metal compounds remained in the solution. It was claimed that the final effluents reached a quality close to that of the standards imposed by international environmental agencies (Bussi et al., 2002). 

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