Abstract: An ammonium persulfate modified graphite felt electrode was used as the cathode, a titanium plate was used as the anode, and activated carbon was used as the particle electrode to construct a three-dimensional electrochemical system. The response surface method （RSM） was used to investigate the COD and ammonia nitrogen capacity of the actual printing and dyeing wastewater. The results showed that the significant of influencing factors of COD removal rate of printing and dyeing wastewater was electrode voltage>reaction time>aeration amount, and the significant of influencing factors of ammonia nitrogen removal rate was electrode voltage>aeration amount>reaction time, and the mathematical model had good regression; Under the conditions of electrode voltage of 7.03 V, aeration amount of 6.78 L/min, and reaction time of 86.77 min, the maximum COD removal rate predicted by the model was 73.37%, and the maximum removal rate of ammonia nitrogen was 88.32%. The removal rates of COD and ammonia nitrogen were 71.24% and 86.19%, respectively, and the relative deviations of the actual results and the predicted values were less than 3%.

Key words: ammonium persulfate, graphite felt, three-dimensional electrochemistry, dyeing wastewater, response surface method