Based On Sulfate Radical In Advanced Oxidation For Advanced Treatment And Preliminary Study Of Coking Wastewater And Dyeing Wastewater

Sulfate radicals based on advanced oxidation process are now quite the prospect of wastewater treatment technology in the environmental field. In this essay, firstly with acid fuchsin and basic fuchsin simulated wastewater as the Research object of study, on the basis of these experiments,further use of thermally activated sodium persulfate and Fe2+-activated sodium persulfate generated sulfate radicals on coking wastewater and dyeing wastewater and experiment through experimental study. Under different experimental conditions, preliminary study the influence of different factors on the simulated wastewater degradation and degradation kinetics. Coking wastewater and dyeing wastewater respectively by using the traditional orthogonal experiment and response surface optimization method to determine optimal solutions. Through these studies, the main results of this paper are as follows:(1) Experimental study of fuchsin acid simulated wastewater the results was found, when T>70℃, the fuchsin acid was fully decolorization and degradation; Fe2+/Na2S2O8 activation system at room temperature, when the Fe2+/Na2S2O8 mole ratio is fixed, there is a certain degree of decolorization, but no thermal activation of a significant treatment effect. In the range of 60～80 ℃, first-order kinetic constants of fuchsin acid is 0.02251, 0.075904 and 0.142008 min-1, respectively;when temperature of 80 ℃, the range of sodium persulfate (Na2S2O8) concentration is 2.5-10 mmol/L, first-order kinetic constants of basic fuchsin is 0.025762,0.077865,0.141718,and 0.219304 min-1 respectively.(2) Experimental study of basic fuchsin simulated wastewater the results was found,when T>60℃, fuchsin basic was fully decolorization and degradation; degradation effectiveness of Fe2+/Na2S2O8 activation system is similar to acid fuchsin, thermal activation Na2S2O8 effect is remarkable. When temperatrue in the range of 50～60 ℃, first-order kinetic constants of fuchsin acid is 0.01155,0.019576,0.0462 and 0.178149 min-1, respectively; when temperature of 80 ℃, the range of sodium persulfate (Na2S2O8) concentration is 2.5～10 mmol/L, first-order kinetic constants of basic fuchsin is 0.077865, 0.178149,0.213231,and 0.241463 min-1, respectively.(3) The dyeing wastewater treatment by thermal activation system, degradation effects of CODcr is about 79.7% at the condition of 80 ℃, pH value of 3, when Na2S2O8 concentration of 10 mmol/L; compare through orthogonal experiment and response surface optimization, the traditional orthogonal optimization solutions is temperature of 80 ℃, pH value of 5, when Na2S2O8 concentration of 10 mmol/L. Transition metal activation system, the best degradation effect about 37.6% when pH value of 3, the Fe2+/Na2S2O8 mole radio is 0.3/2; traditional orthogonal optimization solution for pH value of 3, the Fe2+/Na2S2Os mole radio is 0.3/3 is works best. By method of response surface analysis of the optimization scheme is similar to orthogonal optimization solutions.(4) The thermal activation of coking wastewater treatment system,under the condition of temperature of 80 ℃, pH value of 3 and Na2S2O8 concentration of 25mmol/L, the degradation is the best about 90%; traditional orthogonal optimization solutions for temperature of 80℃, pH value of 3 and Na2S2O8 concentration of 20 mmol/1 is optimal. Transition metal-activated systems,under the condition for pH value of 3, the Fe2+/Na2S2O8 mole radio is 0.2/2,degradation effect is about 56.8%; degradation of the optimal when optimizing programme for pH value of 3, the Fe2+/Na2S2O8 mole radio is 0.1/4. Response surface analysis found that if fixed Na2S2O8 dosing quantity, pH to acidic conditions, the higher the temperature, COD removal efficiency is best; and when the pH is neutral acidic, ferrous sulfate dosage is larger, COD removal efficiency is better.