Experimental study of sinusoidal alternating electro-Fenton technology for tetracycline removal from wastewater
Sinusoidal alternating electro-Fenton(SAEF)is a new type of electro-Fenton technology.In or-der to discuss the efficiency and mechanism of SAEF in removing tetracycline(TC)from wastewater,the effects of current density,initial pH value,conductivity,H2O2 dosage,and some other factors on TC wastewater treat-ment,the oxidation degradation process and mechanism of dynamics of TC wastewater by SAEF were investigat-ed.The results showed that,using SAEF technology to treat TC wastewater with initial mass concentration of 100 mg/L,when the electric current density was 0.694 mA/cm2,the conductivity was 1 075 μS/cm,the 30％H2O2 dosage was 1.17 mL/L,the initial pH value was 3.0,the reaction time was 120 min,the removal rates of TC and COD reached 94.87％and 82.42％respectively.During the SAEF process,the conjugated structure of TC was firstly destroyed to form intermediate products,and then gradually mineralized into inorganic matters.Under the optimal conditions,the TC degradation process follows the second-order kinetic model.
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