摘要
在温度为390～450℃,压力为25 MPa,反应时间为1～10 min的条件下,在间歇式反应釜中采用超临界水共氧化方法处理含油污泥,考察共氧化添加物种类、时间、甲醛质量浓度和温度对氧化效果的影响。结果表明,添加甲醛对含油污泥的转化具有明显的促进作用,450℃反应10 min,含油污泥COD去除率达99.0%。甲醛质量浓度至少要与含油污泥初始COD处于同一数量级时,才具有显著的促进作用。氧化中间产物CO和醋酸产率随甲醛质量浓度提高而增加。反应温度低时甲醛的促进作用明显。随着反应温度的提高,CO产率增加,醋酸产率降低。
Co-oxidation process in the supercritical water （SCW） which accelerates the oxidation rate of refractory compounds by the addition of small amounts of labile compounds, has been developed in this study. Co-oxidation in SCW relies entirely on homogeneous fluid- phase oxidation reaction. It is conceivable that faster reaction rate with mild operation condition can be realized by co-oxidation. The treatment of oily sludge in SCW using co-oxidation is performed in a batch reactor at reaction temperature ranged from 390 ~C to 450 ~C with reaction time between 1 min to 10 min and pressure of 25 MPa. Effects of additive types, reaction time, concentration of formalde- hyde and reaction temperature for the oxidation of oily sludge were investigated. The results showed that addition of formaldehyde enhances the oxidation of oily sludge, leading to higher COD removal rate of 99% at 450 ℃ for 10 min. The co-oxidation enhancement is only significant when the concentration of formaldehyde is at least of the same order of magnitude as initial COD, Yields of intermediate prod- ucts of carbon monoxide and acetic acid increase as concentration of formaldehyde increases. At lower temperatures, the oxidation of oily sludge can be improved significantly by the addition of formaldehyde. Increasing reaction temperature results in an increase of carbon monoxide yield and a decrease of acetic acid yield on the other hand. It helps to provide a reference for treatment technique of oily sludge tion. the development of new harmless through supercritical water oxidation.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2010年第5期29-32,共4页
Journal of Safety and Environment
基金
中国石油天然气集团公司中青年创新基金项目(05E7050)
黑龙江省普通高等学校青年学术骨干支持计划项口(1153G002)
关键词
环境工程学
含油污泥
超临界水
共氧化
甲醛
environmental engineering
oily sludge
snpereritical water
co-oxidation
formaldehyde
