Study On Electrochemical Degradation Technology Of Model Dyeing Wastewater

The electrochemical oxidation process happens on electrode or the aqua by direct orindirect anodic oxidation. Through electric current, it turns refractory organic compounds toharmless material by resolving or transforming. The electrochemical oxidation has attracted agreat deal of attention, mainly because of their ease in operation, amenability to automationand its environmental compatibility.In this study, the effect of regulatory factors on electrochemical degradation and energyconsumption of reactive brilliant red K-2BP is investigated under constant current model.Also, the effect of regulatory factors on electrochemical degradation and energy consumptionof a single dye and mixed dyes is investigated. The reactive brilliant red X-3B, reactivebrilliant blue KN-R and the mixed dyes are used as model wastewater.The results show that:(1) It is found that under the optimal reaction conditions (pH value 6, 28℃,concentration of NaCl 0.2 mol/L and current intensity 60mA/cm~2), the color removal of94.4% within 1 hour can be obtained, and energy consumption of unit mass is 0.1 kwh/kg.(2) The main factors impacting the degradation of reactive brilliant red K-2BP includecurrent intensity, concentration of NaCl, temperature and pH constant current model. Thedegradation rate of reactive brilliant red K-2BP could be greatly improved by strong acid,and energy consumption could be reduced. The initial concentration of dye has little effecton reactive brilliant red K-2BP degradation rate. The greater the concentration is, the greaterthe amount degradation is, and the lower the unit energy consumption is.(3) The degradation rate of reactive brilliant blue KN-R could be greatly improved byincreasing concentration of NaCl or current density, or reducing the initial concentration ofdye. The degradation rate of reactive brilliant red X-3B could be improved a little byincreasing concentration of NaCl or reducing the initial concentration of dye, and thedegradation rate could be greatly improved by increasing current density.(4) The degradation rate of reactive brilliant blue KN-R could be improved by reactivebrilliant red X-3B or the intermediate products. But the degradation rate of reactive brilliantred X-3B is reduced by competition of reactive brilliant blue KN-R.(5) The unit energy consumption declines greatly, when the concentration of NaClincreases. The unit energy consumption of reactive brilliant blue KN-R do not have Regular changes with current density and the initial concentration, but changes little. The unit energyconsumption of reactive brilliant red has great changes with time, lowering fist, and thenincreasing. The unit energy consumption increases with current density, and the more theinitial concentration is, the more the unit energy consumption is.