Kinetics Of Fe～(3+) Catalyzed Oxidation S(Ⅳ) And The Microorganism Metabolize In The Process Of Wet Biochemical Fuel Gas Desulfurization

The kinetics of the coordination interaction of Fe³⁺ catalyzed oxidation and microorganism metabolize were studied in order to achieve the kinetics of wet biochemical flue gas desulfurization technology, the kinetics equation of kinetic determination was correlated between Fe³⁺ catalyzed oxidation and microorganism metabolize with the experimental data.The effect of pH, concentration of Fe³⁺ and S(â…£) and temperature on the kinetics was presented in the present work. It was shown that the oxidation of Fe²⁺ was the rate-determining step in the process of Fe³⁺ catalyzed oxidation S(â…£),the oxidation rate of Fe²⁺ decreased with the increasing concentration of H+ when pH of the solution was within the range of 0³, the oxidation rate of Fe²⁺ increased with the increasing concentration of Fe³⁺ as the concentration of Fe³⁺ was within the range of 0⁰.01 mol·L-1 ,the oxidation rate did not change significantly with the further increasing of the concentration of Fe³⁺, the oxidation rate of Fe²⁺ increased with the increasing concentration of S(â…£)as the concentration of S(â…£)was within 0⁰.1 mol·L-1.The oxidation rate equation was correlated with the experimental data. The oxidation rate increased with the increasing temperature at 20⁴0℃, with the activation energy of 13kJ·mol-1. The reaction of Fe (â…¢) catalyzed oxidation S(â…£) was controlled by the radical chain reaction mechanism.The upgrowth kinetics parameter-μof thiobacillus ferrooxidans bacteria (DYB1) was achieved under different conditions. The oxidation rate of (DYB1) for Fe²⁺ was determined by means of experimentals. To speak more specifically, the oxidation rate reached 0.42g/( L·h-1) under the circumstance of the inoculation 10%, initial concentration of Fe²⁺ 10g/L, pH 2.5,30℃for rotational culture and agitation speed 150r/min.The experiment data of desulfurization indicated that desulfurization process was controlled by chemical reaction in the wet biochemical flue gas desulfurization, in which the concentration of Fe³⁺ was the key factor. The reaction product S(â…£) itself reducing in Fe³⁺ catalyzed oxidation solution was the rate-determining step in the process of desulfurization.The thiobacillus ferrooxidans bacteria did not participate in desulfurization process, but it can bring farther influence on transition oxidation Fe²⁺ to Fe³⁺ for the process. The influence was expressed by the rate constant which was correlated with concentration of Fe³⁺ and the amount of thiobacillus ferrooxidans bacteria.