Huazhong University of Science and Technology, Wuhan, China.
Water Sci Technol. 2013;67(10):2281-6. doi: 10.2166/wst.2013.123.
In this study, we investigated the pretreatment of a high concentration pharmaceutical wastewater by catalytic wet air oxidation (CWAO) process. Different experiments were conducted to investigate the effects of the catalyst type, operating temperature, initial system pH, and oxygen partial pressure on the oxidation of the wastewater. Results show that the catalysts prepared by the co-precipitation method have better catalytic activity compared to others. Chemical oxygen demand (COD) conversion increased with the increase in temperature from 160 to 220 °C and decreased with the increase in pH. Moreover, the effect of the oxygen partial pressure on the COD conversion was significant only during the first 20 min of the reaction. Furthermore, the biodegradability of the wastewater improved greatly after CWAO, the ratio of BOD5/COD increased less than 0.1-0.75 when treated at 220 °C (BOD: biochemical oxygen demand).
在这项研究中，我们研究了催化湿式氧化（CWAO）工艺对高浓度医药废水的预处理。进行了不同的实验来研究催化剂类型、操作温度、初始系统 pH 值和氧分压对废水氧化的影响。结果表明，共沉淀法制备的催化剂具有比其他催化剂更好的催化活性。化学需氧量（COD）转化率随着温度从 160°C 增加到 220°C 而增加，随着 pH 值的增加而降低。此外，氧分压对 COD 转化率的影响仅在反应的前 20 分钟内显著。此外，CWAO 后废水的可生物降解性大大提高，在 220°C 下处理时，BOD5/COD 的比值增加小于 0.1-0.75（BOD：生化需氧量）。
