CaoFengfeng,XuMing,WangJun,et al.Optimization of O3+DNBF Process for Enhanced Denitrification Based on Response Surface Methodology[J].China Water & Wastewater,2026,42(15):67-72.
Optimization of O3+DNBF Process for Enhanced Denitrification Based on Response Surface Methodology
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第42卷
Number:
第15期
Page:
67-72
Column:
Date of publication:
2026-08-01
- Keywords:
- ozone catalytic oxidation; denitrification biofilter; response surface methodology; enhanced denitrification; secondary effluent
- Abstract:
- To optimize the key operating conditions for enhancing denitrification in the treatment of secondary effluent using the ozone catalytic oxidation (O3) combined with denitrification biofilter (DNBF) process, single-factor experiments were conducted to investigate the effects of ozone dosage, hydraulic retention time (HRT), and temperature on the removal of major pollutants, and to determine their respective optimal operating conditions. On this basis, response surface methodology (RSM) was employed to analyze the effects of the above three factors on TN removal in the O3+DNBF process, and the predicted values of the optimized operating conditions and removal rate were obtained from the model. The relative error between the actual and predicted TN removal rates was calculated. The results showed that, in the single-factor experiments, the system achieved the best denitrification performance at an ozone dosage of 15 mg/L, HRT of 6 h, and temperature of 22 ℃. Response surface analysis revealed that the three factors had a significant interactive effect on TN removal. The fitted regression equation from the model optimized the operating conditions as follows: ozone dosage of 16 mg/L, HRT of 6 h, and temperature of 23 ℃, with a predicted TN removal rate of 32.56%. The parallel validation experiments showed that the average TN removal rate was 32.94%, with a relative error of only 0.38%. It was evident that the application of response surface methodology to establish a model for optimizing the O3+DNBF process for advanced treatment of secondary effluent was reliable, achieving enhanced removal of total nitrogen, with the effluent quality meeting the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).
Last Update:
2026-08-01