Abstract: The three-dimensional electrochemical method was used to pretreat fumaric acid wastewater, and the removal rate of ammonia nitrogen was mainly studied. Based on the BBD response surface method, the individual and interaction of voltage, reaction time and initial pH were explored, and a mathematical model of ammonia nitrogen removal rate was established. The results show that the significant order of influence factors is voltage>reaction time>initial pH, and there is a certain interaction among the three, but it is not significant. A satisfactory prediction quadratic polynomial equation was derived by response surface methodology. The maximum removal rate of ammonia nitrogen is predicted to be 88.7%. The optimum operating conditions are： The voltage is 28.41 V, the reaction time is 87.27 min, and the pH is 4.55. Using the above best conditions, the ammonia nitrogen removal rate of 87.6% was obtained, which is consistent with the predicted value of 1.2%.

Key words: response surface optimization method, three-dimensional electrochemistry, fumaric acid wastewater, ammonia nitrogen removal rate