TiO₂ as an Oxidant for Removal of Chemical Oxygen Demand from Sewage

摘要

Photo-catalysis of wastewater using titanium dioxide is an advanced oxidation process (AOP) for environmental remediation. Advanced Oxidation Process can mineralize a wide range of organic compound and convert it into carbon dioxide, water and inorganic ions. Recently Advanced Oxidation Process is an emerging technology for the water purification. Advanced Oxidation Process uses different type of oxidants. Titaniumdioxide has been widely studied on lab scale for decontamination of drinking water. This paper deals with the problem of water contamination due to the sewage and also relates with the photo-catalysis of sewage using titanium dioxide as an oxidant. Photo-catalysis of sewage is mainly depending on the oxidation reduction reaction. 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. Changes in different physical and chemical characteristics of sewage after application of Advanced Oxidation Process were observed using titanium dioxide as a strong oxidizing agent. The photo catalysis of sewage has been studied for removal COD reduction. The influence of TiO2 catalyst and pH on COD removal efficiency was recorded. Maximum COD removal of the sewage achieved was 78% after catalyst dosage of 0.25 g/50ml at alkaline pH 8 and at ambient temperature. Effective contact time is 50 minutes for 80% COD removal 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.