Abstract
In this study, TiCl4 was used as a coagulant to remove total phosphorus (T-P) in the waste water and the economic feasibility of TiO2 prepared from the precipitated sludge was analyzed. After taking from the sewage treatment plants experimental, experimental water was prepared at a T-P concentration of 2.5 mg/L for the test. The optimum amount of TiCl4 coagulant injected was 0.6 ml and the total removal rate was 99.93%. The precipitated sludge was drawn, dried and calcinated at different temperatures of 300 to 1000°C to prepare TiO2. XRD and SEM test was performed to analyze the surface properties and crystallinity of prepared TiO2. The surface of TiO2 prepared at 700~800°C showed the most rounded shape. Anatase crystal structure was observed at calcinated temperature of 500~800°C, however, rutile crystal structure appeared at 900~1000°C. The price of 1kg of TiO2 produced by this study is about 5,400 WON, which is lower than that of commercial P-25 photocatalyst. It is also found that TiCl4 coagulants, which are more expensive than conventional coagulants, are cost-competitive through sludge recycling. Key words: TiCl4, Total phosphorus, Titanium Dioxide, Coagulant
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