响应面法优化光催化/臭氧氧化深度处理炼油废水

利用响应面方法(RSM)对光催化/臭氧氧化深度处理炼油废水工艺进行优化,考察了臭氧通量、光催化剂投加量、初始pH和反应时间对于处理效果的影响,提出采用该工艺的数学模型及优化后的工艺参数。结果表明,各影响因子对COD去除率影响顺序为反应时间>光催化剂投加量>初始pH>臭氧通量,方程的F值为11.54,相关系数为0.9537,调整相关系数为0.915,说明数学模型可以较好地模拟真实的反应曲面。优化得到最佳的工艺参数:臭氧通量1.05 L/min、光催化剂投加量0.33 g/L、初始pH 7.51、反应时间96.95 min,在该条件下,对COD去除率为97.88%,与预测值99.49%接近。采用95%处理水和5%新鲜水混合,水质达到了循环冷凝水的补充水水质指标要求。

Optimization of photocatalytic/ozonation treatment process for oil-refinery wastewater with response surface methodology

Response surface methodology was employed to optimize the photocatalytic/ozonation treatment process for oil-refinery wastewater. The effects of O3 flux, catalyst dosing quantity, initial pH and reaction time on COD removal were investigated. What's more, the mathematical model and optimized parameters of process were also achieved. The results showed that the effects of different factors on COD removal were as follows: reaction time > catalyst dosing quantity > initial pH > reaction time. The mathematical model could greatly response the practical process with the equation F-value of 11.54, correlation coefficient of 0.9537 and adjusted correlation coefficient of 0.915. The optimum process parameters of oil-refinery wastewater treatment were O3 flux of 1.05 L/min, catalyst dosing quantity of 0.33 g/L, initial pH of 7.51, reaction time of 96.95 min. Under the optimum conditions, the actual COD removal rate was 97.88% which closed to the predicted value of 99.49%. The mixed water with the ratio of treated water and fresh water of 95:5 reached the circulation condensate make-up water quality standards.