الفهرس | Only 14 pages are availabe for public view |
Abstract There are a number of techniques, which have been common for wastewater treatment. Such techniques are: chemical oxidation, adsorption and liquid-liquid extraction. The first two methods merely transfer the pollutants from one phase to another and the last requires large plants, is often tricky to manage and often is not sufficient for highly contaminated or toxic wastewater. Advanced Oxidation Processes, AOPs, promise to not only treat but also destroy (mineralize) organic pollutants. These technologies are based on the generation of highly reactive intermediates (principally hydroxyl radicals), which are more powerful oxidants than the chemical agents used in the traditional chemical methods, they are characterized by a selectivity of attack; they are capable of attacking the organic pollutants and initiating their oxidation and eventual mineralization. Most of the commercially developed AOPs are based on the use of ultraviolet light to generate the hydroxyl radical photochemically. It would be highly appreciated if the DV source is obtained from sun. This approach to a solar driven AOP is called solar detoxification. The work in the present thesis is based on the use of a homogenous photo-Fenton catalyst, which captures the solar energy for the destruction of organic pollutants in aqueous media. Sunlight is captured by the ferrioxalate, which, in the presence of hydrogen peroxide, generates hydroxyl radicals at pH 3.0. The latters react with and oxidize organic molecules present in aqueous media. The present work deals with a study on the operational parameters influencing the photocatalytic destruction rate of Methylene Blue and Maxilione Blue dyes. The parameters studied are: pollutant concentration, catalyst concentration, effluent flow rate, solar intensity, artificial DV source and the effect of adding H202 at time intervals. |