Reactor Design Development of Chemical Oxygen Demand Flow System and Its Application

Development of Chemical Oxygen Demand (COD) flow system has been conducted by using TiO2/Ti electrode. This study aims to develop the flow system portable reactor can be used for determination of COD value as a model design in a river, gutter, and disposal of industrial wastewater. A highly ordered the TiO2 nanostructure was grown onto Ti plate by anodizing method then calcinated in temperature 500 °C for 1.5 h. The electrochemical test on TiO2/Ti electrode was performed by using Linear Sweep Voltammetry technique to investigate the high photo-oxidation when ultraviolet (UV) light irradiation. Specifically, the determination of COD value of Sodium Lauryl Sulfate, Hexadecyltrimethylammonium bromide, and 4-oktilfenol poly-ethoxylate surfactants in flow system was applied by using Multi-Pulse Amperometry technique based on Faraday’s Law (Q=∫ Inet dt). The excellent sensing of COD value using TiO2/Ti electrode by flow system showed that SLS, HDTMA-Br, and Triton X-100 surfactants in the concentrations of 1.0 mg/L, 3.0 mg/L, 5.0 mg/L, 7.0 mg/L, and 9.0 mg/L were (1.33 mg/L, 2.92 mg/L, 4.63 mg/L, 6.68 mg/L and 9.43 mg/L); (0.78 mg/L, 3.25 mg/L, 5.21 mg/L, 7.42 mg/L and 9.06 mg/L), and (0.71 mg/L, 3.21 mg/L, 5.05 mg/L, 7.42 mg/L and 8.61 mg/L), respectively.