| With the advancement of urbanization and industrialization process,industries produced more and more odor. Due to the improvement of living conditions, people have higher requirement to the environment. In some developed countries, the stench of events reached more than half of all complaints with a rising trend. With the accelerating urbanization process in our country, the city planning and industrial structure are unreasonable, so that the odor pollution incident occurred frequently. Therefore, solving the odor pollution is urgent.This paper uses a new type of efficient green strong oxidizer, ferrate online removing H2 S and NH3. Explore some key factors influencing ferrate generation and based on the experiment before, research the optimized operation parameters of the reactor. In this paper, the main research results are as follows:First of all,the key factors affecting the generatation of ferrate were studied,the results show that: the points are two rooms of electrolyzer could work better than single room electrolytic; Although the yield of ferrate was a little higher at the temperture 65℃, considering the economic factors, we use the room temperature(about 20℃); when the electrolyte concentration was 12 mol/L, the production of ferrate is the largest, current efficiency was highest; when the current density was5 m A/cm2, the production of ferrate is highest, the current efficiency is highest too.On the basis of the experiment, the electrolytic preparation of ferrate online removing H2 S and NH3 the influencing factors were explored, the results show that:using the Design Expert8.0 software for Design analysis test the experiments results after regression fitting, the regression equation for forecasting model was,Y=96.43+2.52A+1.6B+1.85C+2.24D+0.04AB-2.11AC-1.81 AD +0.45BC+1.76BD2 2 2 2-0.55CD-4.73A-5.14B-4.6C-5.84 D, the Y for the electrolytic preparation of ferrate removing H2 S removal rate; A stands for the electrolyte concentration.B stands for current density;C stands for the gas flow velocity;D stands for gas concentration; Affect the electrolytic preparation of ferrate removing H2 S online process factors from reach, in small order electrolyte concentration > gas concentration > gas flow rate > current density; the optimal process conditions were determined: the electrolyte concentration was 12.5mol/L, current density of7.4m A/cm2, gas flow rate of 100ml/min, the gas concentration to 82 PPM, H2 S removal efficiency can reach above 97%; Using the Design Expert8.0 software for Design analysis of test results after regression fitting, the regression equation for forecasting model, Y=70.6+5.23A+2.74B-2.93C-2.5D-0.19AB-2.57AC-0.4AD2 2 2 2+3.26BC+1.08BD-0.57CD-11.71A-8.01B-3.02 C -1.32 D, Y for the electrolytic preparation of ferrate removing NH3 the removal rate of the gas; A stand for theelectrolyte concentration.B stand for the current density;C stand for the gas flow velocity;D stand for gas concentration; Affect the electrolytic preparation of ferrate removing NH3 process factors from reach, in small order electrolyte concentration > gas concentration > gas flow rate > current density gas velocity; to determine the optimal process conditions: in the electrolyte concentration of10.6mol/L, current density of 9m A/cm2, gas flow rate is 85.7ml/min, gas concentration to 91 PPM, NH3 removal rate can reach 74.03%.This experiment has also further research ferrate online removing sulfur ion dynamics research, getting the result: when Na OH concentration was 12mol/L, the removal rate of S2- was highest; when the current density was 5m A/cm2, S2-removal efficiency was highest. When the initial concentration of S2- was 0.08g/L,the removal efficiency of S2- was highest.By the Arrhenius equation is calculated,the ferrate oxidation reaction activation energy needed to remove the S2-reaction Ea is 36.617KJ/mol. |
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