非均相催化氧化预处理氢化可的松制药废水

PRETREATMENT OF HYDROCORTISONE PHARMACEUTICAL WASTEWATER BY HETEROGENEOUS CATALYTIC OXIDATION

化学合成类制药废水浓度高,成分复杂,难生物降解,往往需要进行有效前处理,以满足后续处理要求。采用自制的非均相催化剂CuO-CeO2/AC,催化氧化氢化可的松制药废水。通过扫描电镜、X射线衍射对自制的催化剂的性能进行了表征,研究了pH、催化剂用量、氧化剂用量和反应时间4个因素对废水处理效果的影响,并确定了预处理氢化可的松制药废水的最佳工艺条件。研究结果表明,催化剂成层状分布,形成尖晶石结构,催化剂的活性组分是CuO和CeO2。最佳工艺条件:pH=5,催化剂用量1.5 g/L,H2O2用量15 mL/L,反应时间60 min。出水COD去除率为90%以上,TOC的去除率稳定在85%左右,废水的BOD5/COD从0.066提高到0.335,满足后续生化处理的要求。

Chemical synthetic pharmaceutical wastewater need to be pretreated before the traditional treatment because of its high concentration, complex composition and bad biodegradability. In this study, the heterogeneous catalyst ofCuO-CeOJAC made by ourselves was applied in catalytic oxidation of hydrocortisone pharmaceutical wastewater. The catalyst performance was characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. Additionally, the effects of pH, catalyst dosage, oxidant concentration and reaction time on effluent quality were investigated and discussed. The optimum conditions for pretreatment of hydrocortisone pharmaceutical wastewater were determined. The results showed that the morphology of CuO-CeO2/AC catalyst was in layered distribution and maybe formed spinel structure. The catalytic active components were CuO and CeO2. The process parameters were optimized as pH=5, catalyst dosage was 1.5 g/L, H2O2 dosage was 15 mL/L, reaction time was 60 min. Eventually, the removal rate of COD was more than 90%, TOC removal rate was stabilized at about 85% and the BODs/COD ratio increased from 0.066 to 0.335, which met the requirement of the subsequent biological treatment.