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采用Fenton氧化对采油废水进行研究,选取双氧水与二价铁离子的摩尔比、初始p H值和反应时间为自变量,以废水的COD去除率为响应值,通过Box-Behnken设计方法进行实验设计,进行了3因素3水平共15个实验点的实验。使用响应面分析法对实验结果进行模拟及分析,建立了响应值与3个自变量的二次多项式方程模型。Fenton氧化的优化工艺条件:n(H2O2)∶n(Fe2+)=0.8,p H=3.0以及反应时间60 min。在该优化条件下,废水的COD去除率可达72.8%,经实验验证,实际值与模型预测值拟合性好,偏差仅为0.5%。实验结果证实了该模型分析采油废水处理运行参数的准确性。优化工艺后的处理水质COD值完全满足油田废水达标排放的要求。通过总离子色谱图和质谱检索分析原油中的成分变化情况,证实Fenton方法对原油组分的降解效果。
Fenton oxidation was used to study the production wastewater. The molar ratio of hydrogen peroxide to ferrous ion, the initial p H value and reaction time were taken as independent variables. The COD removal rate of wastewater was used as the response value. The experimental design was carried out by the Box-Behnken design method , A total of 3 factors and 3 levels of 15 experimental points of the experiment. Response surface analysis was used to simulate and analyze the experimental results, and a quadratic polynomial equation model with response value and three independent variables was established. The optimized conditions of Fenton oxidation are as follows: n (H2O2): n (Fe2 +) = 0.8, p H = 3.0 and reaction time 60 min. Under this optimized condition, the COD removal rate of wastewater can reach 72.8%. The experimental results show that the actual value is in good agreement with the model predictive value, and the deviation is only 0.5%. The experimental results confirm the accuracy of this model in analyzing operating parameters of oil recovery wastewater treatment. Optimized process after the treatment of water quality COD fully meet the requirements of oilfield wastewater discharge standards. The composition of the crude oil was analyzed by total ion chromatogram and mass spectrometry, and the degradation of crude oil by Fenton method was confirmed.