UV/Oxone降解水中扑热息痛的效能及影响模型

Efficiency and effect model of acetaminophen degradation by UV/Oxone

采用UV、oxone和UV/Oxone3种工艺降解ACE,同时对体系中氧化活性物质种类和贡献率进行鉴别和计算.采用响应面曲线法研究HCO3^?、Cl^?、NO3^?、pH值和温度5因素、3水平条件下UV/Oxone对ACE的去除效果的综合影响,并选用3种实际水体作为原水水质背景来评价UV/Oxone降解ACE的实际降解值和模型预测值的差距,最后比较了3种工艺的效能.结果表明UV、oxone、UV/Oxone3种工艺对ACE的去除率分别为2.1%、53.7%和98.3%.活性物质的鉴别实验发现UV激活oxone会产生?OH、SO4?–和活性氯3种活性物质,且对ACE降解的贡献率分别为37.05%、19.22%和43.73%.通过响应面曲线法得到影响降解ACE效果的回归方程式,该回归方程对应的p值小于0.0001,拟合缺失项不显著,校正决定系数R2>0.8,说明该模型可信度高.选用实际水体进行实际降解和模型预测比较时发现实际降解值基本符合模型预测值.最后对两种不同工艺进行效能比较发现在同等时间和降解率的情况,UV/Oxone耗能最低,是一种高效、快速、可行的降解工艺.

This work reported the efficiency of degradation ACE used three degradation processes(i.e.UV、oxone and UV/Oxone).Meanwhile,the kinds of oxidative active substances and contribution in the system were identified and calculated.Response surface curve method(RSM)was used to study the comprehensive effect of UV/Oxone on ACE removal under five factors including HCO3-,Cl-,NO3-,pH and T and three levels.Furthermore,three kinds of actual water were chosen as the quality indicator of raw water to evaluate the difference between actual degradation values and model predictive values of degradation ACE by UV/Oxone.Finally,the degradation efficiencies of three processes were evaluated.The results showed that the degradation rates of UV、oxone and UV/Oxone were 2.1%,53.7%and 98.3%,respectively.Identification experiments of active substances found that three active substances were produced by UV activation of oxone,such as?OH、SO4?–and reactive chlorine,and the contribution of three active substances to ACE degradation were 37.05%、19.22%and 43.73%,respectively.The regression equation of ACE degradation was obtained by RSM.The p value was less than 0.0001,the missing fitting term was not obvious and R2>0.8,which indicated that the model was highly reliable.Actual waters,as degradation substance,were selected to compare the actual and model predicted and found that two values were matched basically.Compared with the efficiency of two different processes,the result showed that UV/Oxone was an effective,rapid and feasible degradation process with the lowest energy consumption at the same time and degradation rate.