UV/H2Ｏ2/微曝气联用工艺矿化内分泌干扰物BPA试验研究

采用UV/H₂Ｏ₂/微曝气工艺对水中内分泌干扰物双酚A(BPA)的降解与矿化进行了试验研究.该工艺是在UV/H₂Ｏ₂的基础上发展起来的一种新工艺,微曝气在UV光照射下产生了一定量的O₃,提高了·OH的发生率.本试验研究了UV光强、H₂Ｏ₂投加量以及pH值对BPA矿化速率的影响.结果表明,随着UV光强的增大,BPA的矿化速率呈线性增加;当H₂Ｏ₂投加量由5 mg/L增大到20 mg/L时,BPA矿化速率常数k由0.003 2上升到0.025 0;当pH为6.68时,在相同条件下BPA的矿化效果最好.在同一工况条件下,UV/H₂Ｏ₂/微曝气工艺降解BPA的速率远远大于其矿化速率,分析得出在开始反应阶段BPA首先被降解为小分子有机物,随着反应的进一步进行小分子有机物逐步被矿化为无机物.

Mineralization of BPA by combination of UV/H2O2/micro-aeration process

The degradation and mineralization of bisphenol A(BPA) in water by UV/H2O2/micro-aeration process were investigated. UV/H2O2/ micro-aeration is a new process developing from UV/H2O2. A quantity of ozone appears when both micro-aeration and UV radiation exist, which enhances the productive rate of *OH. The effects of intensity of UV radiation, dosages of H2O2 and initial pH of the solution on mineralization of BPA by UV/H2O2/micro-aeration process were studied. The results show that the mineralization rate of BPA increases linearly with the enhancement of intensity of UV radiation. When the dosages of H2O2 change from 5 mg/L to 20 mg/L, the constant (k) of mineralization rate rises from 0.003 2 to 0.025 0. While pH is 6.68, it can get the best effect of mineralization. Under the same conditions the mineralization rate is much higher than its degradation rate. It's found that BPA is first degraded into smaller molecular organic matters, and the small molecular organic matters are further mineralized into inorganic matters gradually.