Study On Degradation Of Model Dyeing Wastewater Using Active Chlorine Under Constant Current

In this study,the effect of regulatory factors on electrochemical degradation and energy consumption of reactive brilliant red K-2BP is investigated using active chlorine under constant current model.Also,the effect of regulatory factors on electrochemical degradation of a single dye and mixed dyes is investigated.The reactive brilliant red X-3B,reactive brilliant blue K.N-R,reactive light yellow X-6G and the mixed dyes are used as model wastewater.The results show that:(1)It is found that under the optimal reaction conditions(current intensity 60mA/cm~2, concentration of NaCl 0.2 mol/L,initial concentration of reactive brilliant red K-2BP 30mg/L, room temperature and pH value 6),the color removal of 94.4%within 1 hour can be obtained, and energy consumption of unit mass is 10kwh/kg.(2)The main factors impacting the degradation of reactive brilliant red K-2BP include initial concentration of reactive brilliant red K-2BP,current intensity,concentration of NaCl, temperature and pH constant current model.The degradation rate of reactive brilliant red K-2BP could be improved by increasing current intensity,but the energy consumption is increased.More concentration of NaCl and high temperature can increase degradation rate and reduece energy consumption The degradation rate could be greatly improved by strong acid,and energy consumption could be reduced.The initial concentration of dye has little effect on reactive brilliant red K-2BP degradation rate.The greater the concentration is,the greater the amount degradation is,and the lower the unit energy consumption is.(3)Under the conditions(current intensity 60mA/cm~2,concentration of NaCl 0.02 mol/L, initial concentration of reactive brilliant red K-2BP and reactive brilliant blue KN-R 30mg/L, room temperature and pH value 6),the color removal of 94.0%and 73.0%within 30 minutes can be obtained.(4)The degradation rate of reactive brilliant blue KN-R could be improved by reactive brilliant red X-3B or the intermediate products.But the degradation rate of reactive brilliant red X-3B is reduced by competition of reactive brilliant blue KN-R.(5)Under the conditions(current intensity 60mA/cm~2,concentration of NaCl 0.02 mol/L,initial concentration of reactive brilliant red K-2BP,reactive brilliant blue KN-R and reactive light yellow X-6G 30mg/L,room temperature and pH value 6),the color removal of 97.2%,88.0%and 56.7%within 35 minutes can be obtained.(6)The degradation rate of reactive brilliant blue KN-R and reactive brilliant red X-3B could be improved by reactive light yellow X-6G.But the degradation rate of reactive light yellow X-6G is reduced.