摘要
以某制药企业的二级出水为研究对象,对比了UV/TiO_(2)、UV/H_(2)O_(2)、UV/TiO_(2)/H_(2)O_(2)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/TiO_(2)和UV/H_(2)O_(2)体系相比,UV/TiO_(2)/H_(2)O_(2)光芬顿体系对有机物的去除效果更好,当TiO_(2)投加量为1 g·L^(-1),H_(2)O_(2)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/TiO_(2)/H_(2)O_(2)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/TiO_(2)/H_(2)O_(2)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.
This study investigated the removal efficiency of the secondary effluents of pharmaceutical wastewater by three advanced oxidation processes(UV/TiO_(2),UV/H_(2)O_(2) and UV/TiO_(2)/H_(2)O_(2)),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/TiO_(2)/H_(2)O_(2) process exhibited higher removal efficiency than UV/TiO_(2) and UV/H_(2)O_(2),and the optimized dosage of TiO_(2) and H_(2)O_(2) 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/TiO_(2)/H_(2)O_(2) 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/TiO_(2)/H_(2)O_(2) treatment.The toxicity of the effluents was also significantly reduced after the advanced treatment.
作者
吴晓萍
张军
张弓
兰华春
刘会娟
WU Xiaoping;ZHANG Jun;ZHANG Gong;LAN Huachun;LIU Huijuan(Center for Water and Ecology,School of Environment,Tsinghua University,Beijing 100084)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第10期3947-3955,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.52091542)。
