Cui Baochen, Cui Fuyi, Jing Guolin, Xu Shengli, Huo Weijing, Liu Shuzhi
School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin, PR China.
J Hazard Mater. 2009 Jun 15;165(1-3):511-7. doi: 10.1016/j.jhazmat.2008.10.008. Epub 2008 Oct 14.
The oxidation of oily sludge in supercritical water is performed in a batch reactor at reaction temperatures between 663 and 723 K, the reaction times between 1 and 10 min and pressure between 23 and 27 MPa. Effect of reaction parameters such as reaction time, temperature, pressure, O(2) excess and initial COD on oxidation of oily sludge is investigated. The results indicate that chemical oxygen demand (COD) removal rate of 92% can be reached in 10 min. COD removal rate increases as the reaction time, temperature and initial COD increase. Pressure and O(2) excess have no remarkable affect on reaction. By taking into account the dependence of reaction rate on COD concentration, a global power-law rate expression was regressed from experimental data. The resulting pre-exponential factor was 8.99 x 10(14)(mol L(-1))(-0.405)s(-1); the activation energy was 213.13+/-1.33 kJ/mol; and the reaction order for oily sludge (based on COD) is 1.405. It was concluded that supercritical water oxidation (SCWO) is a rapidly emerging oily sludge processing technology.
在间歇式反应器中，于663至723 K的反应温度、1至10分钟的反应时间以及23至27 MPa的压力下进行含油污泥的超临界水氧化反应。研究了反应时间、温度、压力、氧气过量以及初始化学需氧量（COD）等反应参数对含油污泥氧化的影响。结果表明，10分钟内化学需氧量（COD）去除率可达92%。COD去除率随反应时间、温度和初始COD的增加而提高。压力和氧气过量对反应无显著影响。考虑到反应速率对COD浓度的依赖性，根据实验数据回归得到了一个整体幂律速率表达式。所得指前因子为8.99×10¹⁴（mol·L⁻¹）⁻⁰.⁴⁰⁵·s⁻¹；活化能为213.13±1.33 kJ/mol；含油污泥（基于COD）的反应级数为1.405。得出的结论是，超临界水氧化（SCWO）是一种迅速兴起的含油污泥处理技术。
