In order to realize the optimized activation of persulfate by dielectric barrier discharge (DBD) for the treatment of tetracycline wastewater, the discharge voltage, the initial pH value of the solution and the persulfate dosage were selected as the independent variables, and the removal of tetracycline was as the response value. The effect of tetracycline degradation with persulfate activated by DBD was analyzed using the response surface method Box-Behnken design principle. The experimental results show that the order of the factors affecting the removal rate of tetracycline is as follows:the discharge voltage>persulfate dosage>initial pH value of the solution. The optimal conditions for the degradation of tetracycline in wastewater are as follows: discharge voltage 18.0 kV, initial solution pH 8.48, persulfate dosage 138.89 mg, and the tetracycline removal rate reaches 95.9% under optimized conditions. The oxidative degradation of tetracycline accords with the first-order reaction kinetics. When the initial solution pH=3.9 and 5.9, the main free radical for degrading tetracycline is SO4-•, when the initial solution pH=7.3 and 8.3, the main free radicals for degrading tetracycline are SO4-• and •OH; when the initial solution pH is 10.5, the main free radical for degrading tetracycline is •OH.
KEY WORDS :low temperature plasma;advanced oxidation technologies;optimized;persulfate;tetracycline wastewater;
图4
放电电压与溶液初始pH值交互影响四环素去除率的响应面及等高线
Fig.4
Response surface plot and contour plot of reciprocal effect of discharge voltage and pH value on Tetracycline removal rate
图5
放电电压与过硫酸盐投加量交互影响四环素去除率的响应面及等高线
Fig.5
Response surface plot and contour plot of reciprocal effect of discharge voltage and persulfate dosage on Tetracycline removal rate
图6
溶液初始pH值与过硫酸盐投加量交互影响四环素去除率的响应面及等高线
Fig.6
Response surface plot and contour plot of reciprocal effect of pH value and persulfate dosage on Tetracycline removal rate
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