Experimental Study on BDD Electrode Electrochemical Oxidation of Desizing Waste water from Printing and Dyeing Industry
BDD electrode electrochemical advanced oxidation treatment technology was employed for the purification treatment of desizing wastewater with high-salt and strong-alkali in printing and dyeing industry.The effects of current density(40-100 mA/cm2),ions and the addition of electrolyte Na2SO4(100-500 mmol/L)on CODCr removal,biochemistry and energy consumption of wastewater were investigated,on which the optimized degradation process conditions were obtained.The results show that the optimal degradation efficiency is achieved at the current density of 70 mA/cm2;SO42-ions are more favorable for the removal of CODCr;the kinetic constant of kCOD shows a linear increase with the greater Na2SO4 addition,which is more beneficial to the degradation of organic matters in the desizing wastewater.The optimized process conditions of BDD electrode electrochemical advanced oxidation for treating desizing wastewater with high-salt and strong-alkali in printing and dyeing industry are as follows:effluent standard can be reached in 3 h under the condition of current density at 70 mA/cm2 and Na2SO4 with 500 mmol/L,and the average energy consumption is 14.46 kWh/kg CODCr,which can be considered for industrializing application.
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