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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。
Under the condition of temperature of 390-450 ℃, pressure of 25 MPa and reaction time of 1-10 min, the oily sludge was treated by supercritical water co-oxidation in a batch reactor. The types of co-oxidation additive, , Formaldehyde concentration and temperature on the oxidation effect. The results showed that adding formaldehyde could promote the conversion of oily sludge. When the reaction was carried out at 450 ℃ for 10 min, the COD removal rate of oily sludge reached 99.0%. Formaldehyde concentration at least with the initial sludge oily sludge in the same order of magnitude, had a significant role in promoting. Oxidation of the intermediate product of CO and acetic acid yield increased with increasing formaldehyde concentration. When the reaction temperature is low, the promotion effect of formaldehyde is obvious. As the reaction temperature increases, the yield of CO increases and the yield of acetic acid decreases.