Study on Degradation of Model Dyeing Wastewater Using Active Chlorine under Constant Current
|School||Dalian University of Technology|
|Keywords||Constant current Active chlorine Reactive Dyes A multi - component mixed dye Decolorization Energy consumption|
In this paper, with a constant current power-generating active chlorine Degradation Dye Wastewater reactive brilliant red K-2BP investigated the degradation of single dye solution regulatory factors affect its electrochemical decolorization and energy consumption; choose reactive brilliant red X-3B Reactive Brilliant Blue KN-R and Reactive Dyes X-6G, examines the degradation of mixed dye solution regulatory factors affect the impact of single dye mixed dye decolorization. The results show that: (1) constant current power generated active chlorine Degradation of Reactive Red K-2BP simulated dye wastewater. Reactive brilliant red K-2BP concentration of 30mg / L, current density of 60mA/cm ~ the NaCl concentration 0.2mol / L, at room temperature, without adjusting the pH after 1h electrolysis, reactive red K-2BP decolorization rate 94.4%, unit energy consumption 10kwh/kg. (2) In this mode, the current density, NaCl concentration, temperature, pH, the impact dye decolorization and energy consumption, the main factors. Increasing the current density can be improved decolorization rate, but it also increases the energy consumption; increasing the NaCl concentration can enhance the decolorization rate and can reduce energy consumption; high temperature is conducive to dye bleaching, to reduce energy consumption; strongly acidic conditions can greatly improve the dye decolorization rate, and reduce energy consumption. The initial concentration of the dye has little effect on the decolorization rate, the greater the concentration, the greater the amount of decolorization, the lower the unit energy consumption. (3) active chlorine generated by a constant current power degradation of reactive red X-3B and Reactive Brilliant Blue KN-R two-component mixing dye wastewater is effective in the current density from as 60mA/cm to 2, NaCl concentration of 0.02 mol / L, active red X-3B and reactive brilliant blue KN-R concentration of 30mg / L, at room temperature, without adjusting the pH of up to 94.0% and 73.0%, respectively, after 30min electrolysis decolorization rate. (4) in the degradation of reactive brilliant red X-3B and Reactive Brilliant Blue KN-R two-component mixing dyes, reactive red X-3B or intermediate can accelerate decolorization of Reactive Brilliant Blue KN-R makes reactive brilliant Blue KN-R rate increase. Active red X-3B decolorization rate due to the activity of Brilliant Blue KN-R competition. (5) active chlorine generated by a constant current power degradation of reactive brilliant red X-3B Reactive Brilliant Blue KN-R and Reactive Dyes X-6G three-component mixing dye wastewater is valid, the current density 60mA/cm to 2, NaCl concentration of 0.02 mol / L reactive brilliant red X-3B Reactive Brilliant Blue KN-R and X-6G Reactive Dyes concentration of 30mg / L, at room temperature, without adjusting the pH after 35min electrolysis decolorization rate up to 97.2%, 88.0% and 56.7%, respectively. (6) in the degradation of the mixed dye, Reactive Dyes join X-6G can accelerate reactive red X-3B and Reactive Brilliant Blue KN-R decolorization; due to reactive brilliant red X-3B and reactive brilliant blue KN- R competition reduces the decolorization rate of Reactive Dyes X-6G.