Ecology, Environment and Conservation Paper

Vol.11, Issue 1, 2005; Page No.(39-47)


S. Kanmani, K. Thanasekaran And Dieter Beck


In this study, a pilot scale solar photocatalytic reactor of suspended catalyst system was developed for solar photocatalytic decolourisation of textile dyeing rinse wastewaters. The reactor was designed based on the outdoor performance studies conducted on bench scale reactors. The pilot scale reactor was designed for a flow rate of 11,760 L day-' with indigenous catalyst (IS Ti02) concentration of I g L- I. The trapezoidal configuration of the reactor was selected and the reactor was designed to operate in continuous flow mode. The capital cost and the operation and maintenance cost of the treatment system were estimated (the treatment system includes the reactor and other accessories). The cost of the solar photoctalytic treatment system with indigenous titanium dioxide (ISTi02) proved to be marginally economical when compared with the cost of an existing treatment plant the uses chemical precipitation and adsorption for treatment of textile dyeing rinse wastewaters for the same flow rate of 11,760 L day-' . Hence, it is concluded that for tropical countries the solar photocatalytic treatment system has proved to be a more suitable wastewater treatment technique for decolourisation of textile dyeing wastewaters. In this technique, renewable solar rediation is used as the light source for photoactivation, the non-toxic and non-soluble titanium dioxide that that can be recovered and reused is used as Photocatalyst and in addition, there rs no transfer of pollutant from one medium to another.

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