UV/TiO2/H2O2体系对制药废水二级出水的处理特性研究

以某制药企业的二级出水为研究对象，对比了UV/TiO₂、UV/H₂O₂、UV/TiO₂/H₂O₂ 3种高级氧化工艺的处理效果，利用自主设计的一体化光催化装置进行了连续动态试验，并通过凝胶渗透色谱（GPC）、傅里叶变换红外光谱（FT-IR）、三维荧光光谱（EEM）、斑马鱼急性毒性试验等方法研究了处理前后有机物特性和生物毒性的变化.结果表明，与UV/TiO₂和UV/H₂O₂体系相比，UV/TiO₂/H₂O₂光芬顿体系对有机物的去除效果更好，当TiO₂投加量为1 g·L^-1，H₂O₂投加量为100 mg·L^-1时，处理效果达到最佳.一体化光催化装置能够利用UV/TiO₂/H₂O₂光芬顿技术快速高效地降解二级出水中的有机污染物，反应30 min时COD去除率达到50%以上.经UV/TiO₂/H₂O₂深度处理后，废水中的大分子有机物分解转换为小分子，有机物中的不饱和结构明显减少，腐殖质等溶解性有机物基本降解完全.毒性试验结果表明，该二级出水的生物毒性经深度处理后显著降低，对斑马鱼胚胎不存在致畸致死效应.

Degradation of the secondary effluents of pharmaceutical wastewater by UV/TiO2/H2O2 process

This study investigated the removal efficiency of the secondary effluents of pharmaceutical wastewater by three advanced oxidation processes (UV/TiO₂,UV/H₂O₂ and UV/TiO₂/H₂O₂), and then conducted a pilot-scale test using a self-designed integrated photocatalytic reactor. Several methods have been employed to characterize the change of organic properties during the process, including gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FT-IR) and excitation-emission-matrix spectroscopy (EEM). Zebrafish embryos were also used to determine toxic effect of the wastewater. The results show that, UV/TiO₂/H₂O₂ process exhibited higher removal efficiency than UV/TiO₂ and UV/H₂O₂, and the optimized dosage of TiO₂ and H₂O₂ is 1 g·L^-1 and 100 mg·L^-1 respectively. The integrated photocatalytic reactor was proved to be capable of degrading organic compounds effectively, as the removal efficiency of COD reached 50% within 30 minutes. During UV/TiO₂/H₂O₂ process, high molecular weight organics were transformed into lower ones, and the unsaturated structure decreased obviously. The humic acid-like organics, as the major dissolved organic matter of the wastewater, were almost completely degraded after UV/TiO₂/H₂O₂ treatment. The toxicity of the effluents was also significantly reduced after the advanced treatment.