摘要
利用光催化氧化技术高效、低选择性的特点,系统地探讨了ZnO与TiO2等光催化剂种类以及用量、光照时间、废水的初始浓度、pH值、混合条件等因素对预处理头孢类制药废水的光催化氧化特性的影响。在光催化氧化过程中,头孢类制药废水的COD去除率受催化剂用量、光照时间、废水初始浓度和pH值影响较大,反应器内的混合条件显著影响头孢类制药废水的光催化氧化效率。混合使用ZnO与TiO2光催化剂对COD的去除率优于单独使用ZnO或TiO2光催化剂时的效果。稀释头孢半合成生产废水可以显著提高处理效果,最高COD去除率达到99%。
The present paper has done a detailed study on the effect of some special pollutants and operation conditions involving types and dosages of photocatalyst, such as TiO2 and ZnO, illumination time, initial COD and pH value of the wastewater, manner of agitation on the characteristic features of photocatalytic oxidation. As is known, such pollutants are easy to be migrated and enriched in the environment during the bio-chemical treatment of wastewater produced by pharmaceutical manufacturing, the technique of photocatalytic oxidation with high efficiency and low selectivity has been employed in the treatment of wastewater from the production of cephalosporinfor in case to avoid the demerit. The results of the experiments done by the author show that the dosage of photocatalyst, illumination time, initial COD and pH values of the wastewater clearly influence the COD removal of the wastewater and the manner of agitation in the reactor, which are actually the key factors to keeping the efficiency of photocatalytic oxidation. In addition, it has proved to be more effective to use the mixture of TiO2 and ZnO than to use them singly or separately in removing COD from the wastewater. And in turn the efficiency of photocatalytic oxidation can be evidently enhanced by diluting the wastewater. As a result, the COD removing percentage can be made to reach 99% in optimum conditions.
出处
《安全与环境学报》
CAS
CSCD
2005年第4期55-57,共3页
Journal of Safety and Environment
基金
国家自然科学基金项目(20476010)
北京理工大学基础科研基金项目(BIT-UBF-200305B05)
关键词
环境工程
头孢类制药废水
光催化氧化
二氧化钛
氧化锌
environmental engineering
cephalosporin wastewater
photocatalytic oxidation
titanium dioxide
zinc oxide
