Ti(Ⅳ)催化臭氧化预处理酸性难降解制药废水  

Pretreatment of an acidic refractory pharmaceutical wastewater by Ti(Ⅳ) catalytic ozonation

作　　者：陈尧[1] 彭若帆 丁忠展 周慧华 童少平[1] 

机构地区：[1]浙江工业大学化学工程学院绿色化学合成技术国家重点实验室培育基地,杭州310032 [2]浙江省工业环保设计研究院有限公司,杭州310005

出　　处：《环境工程学报》2015年第8期3687-3691,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21176225);浙江省重大科技专项(2013C03019)

摘　　要：考察了酸性条件下Ti(Ⅳ)催化臭氧化预处理医药废水的效能,关联了废水氧化度与可生化性(BOD5/COD)的关系。结果表明,酸性条件下O3和O3/H2O2的氧化效率明显低于Ti(Ⅳ)/H2O2/O3。原始pH条件(3.5)下,Ti(Ⅳ)/H2O2/O3体系Ti(Ⅳ)离子和H2O2的最佳浓度分别为10 mg/L和200 mg/L。调节pH值至5.0处理120 min,制药废水的化学需氧量(COD)和总有机碳(TOC)的去除率分别为56.13%和31.49%。此时水样氧化度从原来的0.388提升到了0.608,BOD5/COD值从原来的0.019升至0.297,两者呈现较好的正相关性。以上结果表明,增大pH可以提高Ti(Ⅳ)/H2O2/O3的处理效果;此外,可以考虑利用氧化度的大小来快速判断水样的可生化性。Pretreatment of an acidic refractory pharmaceutical wastewater by Ti（IV） catalytic ozonation was investigated, and the correlation between the oxidative degree and biodegradability （BOD5/COD） was also dis- cussed under acid conditions. The results indicated that Ti（ IV）/O3/H2O2 had higher oxidative efficiency than 03 and O3/H2O2 had in acidic medium. The optimized concentrations of Ti（ IV ） and H202 in Ti（ IV ）/O3/H2O2 were 10 mg/L and 200 mg/L at pH 3.5, respectively. At pH 5.0, the removal rates of chemical oxygen demand （COD） and total organic carbon （TOC） were 56. 13% and 31.49% after 120 min of treatment, respectively. The oxidative degree and BODJCOD value of the pharmaceutical wastewater increased from the original 0. 388 and 0. 019 to 0. 608 and 0. 297, respectively, indicating a good positive correlation between oxidative degrees and their biodegradability. The experimental result showed that increasing pH could improve the efficiency of Ti （IV）/O3/H2O2. In addition, the oxidative degree could probably be used to determine biodegradability of sam- ples quickly in wastewater treatment.

关 键 词：臭氧 降解 氧化 废水 氧化度 可生化性 有机污染物 

分 类 号：X703[环境科学与工程—环境工程]