O₃催化氧化深度处理焦化废水生化尾水影响因素

In order to study the influencing factors of the ozone catalytic oxidation technology for the deep treatment of the biochemical tailings of coking wastewater, the effect of COD of wastewater, the reaction pH, the amount of hydrogen peroxide dosage, the catalyst dosing ratio and reaction temperature on the biochemical tailings of ozone-catalyzed oxidized coking wastewater was explored by means of a single factor test using an independently designed ozone fixed bed reactor test device.In addition, with the help of mathematical optimization and analysis models, the interactive effects and correlations of various factors on COD and phenol removal rates are predicted, compared, and analyzed.Based on the single-factor test and the Box-Behnken Design model with response surface optimization, the influence intensity of pH, catalyst filling ratio, and hydrogen peroxide dosage on the biochemical tailings of ozone-catalyzed coking wastewater was analyzed in depth.The model proves that the model is highly fit.The single factor test results showed that the optimal removal rate of wastewater COD was 57.72%.The reaction conditions at this time were:The COD is 120 mg/L, the reaction pH is 6.0, the mass concentration of O₃ is 100 mg/L, the mass flow of ozone O₃ is 1.56 mg/min, the catalyst dosage ratio (catalyst quality and wastewater quality ratio) is 5:1, and the mass fraction of hydrogen peroxide is 0.08%.The response surface optimization model results show that the interaction between pH and catalyst dosing ratio is the strongest, and it contributes a large value to the final removal rate.The correlation coefficient of the quadratic polynomial simulation is high, which is R²=0.964 6, indicating that the model has a high degree of fit.GC-MS was used to further analyze the changes of organic components during the ozone fixed bed advanced treatment of the coking wastewater biochemical tail water. The results confirmed that after ozone catalytic oxidation treatment, the macromolecular organic compounds in the wastewater had been converted to smaller molecular weight substances. The presence of phenol was not detected in part of the test, and the ozone-catalyzed oxidation of COD and phenol in the biochemical tail water of the coking wastewater had a significant removal effect.