Solar Photocatalytic Treatment of Sewage using Titanium Dioxide

Authors: P Mageshkumar, S Ramesh, G Mahalakshmi, R Hemalini,
Abstract: Pure water is never found in nature and it is increasingly rare to encounter a source of water that requires no treatment before being used for portable water supply. Conventional treatment methods are not effective for the degradation of toxic organic pollutants; hence other treatment techniques are necessary. One of the recent developments in this field is the Advanced Oxidation Process (AOP). In this Advanced Oxidation Process, photo catalysis is a technique which utilizes the solar radiation to treat the sewage with more organic contents. For the removal of organic waste form the sewage, oxidation reduction reaction is used and this reaction is accelerated using titanium dioxide as a strong oxidizing agent. Titanium di-oxide (TiO2) is widely used as a catalyst for this purpose, to oxidise or reduce the organic pollutants in wastewater. This paper deals with performance of the titanium dioxide under varying parameters of the sewage and its efficiency. The photo catalysis of sewage has been studied for removal COD reduction. The influence of TiO2 catalyst on COD removal efficiency was recorded. Maximum COD removal of the sewage achieved was 95% after catalyst dosage of 20 g/500ml at alkaline pH 7.6 and at 33oC temperature. Effective contact time is 50 minutes with optimum catalyst and pH. The photocatalytic degradation process using TiO2 as an irradiation source showed potential application for the COD removal of the sewage.