湿式氧化法处理含油废水研究

发布时间：2018-06-09 17:09

  本文选题：湿式氧化 + 含油废水　； 参考：《东北石油大学》2017年硕士论文

【摘要】：由于含油废水中含有一些难生物降解的有机物,生物处理出水一般很难达到排放要求,需要进行深度处理。高级氧化法是去除污水中难降解有机物的主要方法之一,因此在给水处理中已得到了广泛的应用。本文以含油废水作为研究对象,采用湿式氧化法处理含油废水,研究其降解反应特性,为含油废水处理提供指导。考察了湿式氧化工艺处理含油废水中的主要操作条件,如反应压力、反应温度、反应停留时间、氧化剂用量等对含油废水处理效果的影响,在充足的氧化剂添加条件下,湿式氧化具有良好的处理效果,得到了最佳的反应条件:反应温度305°C、压力为14MPa、氧化剂用量200 mg/L、反应停留时间为9 min,此时COD去除率为81.5%。催化湿式氧化工艺能在较温和条件下提高处理的效果。论文研究发现甲醇、异丙醇、甲醛、乙醇、过渡金属离子、碱催化剂对湿式氧化处理含油废水具有很好的催化作用。研究结果表明,甲醛的添加有利于含油废水COD的去除,当甲醛质量浓度增加到500mg/L时,COD去除率达到最高值。金属离子催化剂对湿式氧化含油废水具有较好的催化活性。各种金属盐催化剂的催化活性由高到低的顺序为:Fe(NO3)3Ni(NO3)2Mn(NO3)2。随着反应停留时间的延长,在Fe3+和Ni2+催化作用下,含油废水的COD去除率提高。到反应停留时间为9 min时,Fe(NO3)3和Ni(NO3)2催化下的COD去除率分别为99.6%和96.3%。添加LiOH、Li2CO3和LiHCO3均有利于含油废水COD的去除,添加LiOH比LiHCO3和Li2CO3处理效果更好;添加LiOH的最适宜浓度为200 mg/L,此时COD去除率达到最大值97.4%。为了更好的考察各个影响因素对含油废水COD去除率之间的关系,采用Box-Behnken设计,实验结果表明,反应温度、反应停留时间、催化剂用量、氧化剂用量等对COD去除率的影响都比较大,温度对COD去除率的影响最大。所得结果与单因素分析结果相同。最优化条件为:反应温度288°C,反应停留时间7 min、催化剂LiOH用量为133 mg/L、氧化剂用量188 mg/L,此时COD去除率99%。
[Abstract]:Because the oily wastewater contains some organic matter which is difficult to biodegrade, it is very difficult to meet the discharge requirement of the wastewater treated by biological treatment, so it is necessary to carry out advanced treatment. Advanced oxidation is one of the main methods to remove refractory organic compounds in wastewater, so it has been widely used in water treatment. In this paper, the oily wastewater was treated by wet air oxidation process, and its degradation reaction characteristics were studied, which provided guidance for the treatment of oily wastewater. The effects of main operating conditions, such as reaction pressure, reaction temperature, reaction residence time and oxidant dosage, on the treatment of oily wastewater by wet air oxidation process were investigated. The optimum reaction conditions were obtained as follows: reaction temperature 305 掳C, pressure 14 MPA, oxidant dosage 200 mg / L, residence time 9 min, COD removal rate 81.5%. Catalytic wet air oxidation process can improve the treatment effect under mild conditions. It is found that methanol, isopropanol, formaldehyde, ethanol, transition metal ions and alkali catalysts can catalyze the treatment of oily wastewater by wet air oxidation. The results showed that the addition of formaldehyde was beneficial to the removal of COD in oily wastewater. When the mass concentration of formaldehyde increased to 500 mg / L, the removal rate of COD reached the highest value. Metal ion catalyst has good catalytic activity for wet oxidation oily wastewater. The order of catalytic activity of various metal salt catalysts from high to low is: Feno _ 3N _ 3N _ 3N _ 3N _ 3O _ 3N _ 2MnNO _ 3H _ 2. With the prolongation of reaction residence time, the COD removal rate of oily wastewater increased under the catalysis of Fe _ 3 and Ni _ 2. When the residence time of the reaction was 9 min, the removal rates of FeN3CO3 and NiONO3K2 were 99.6% and 96.3wt% respectively. The addition of LiOHCO3 and LiHCO3 is beneficial to the removal of COD in oily wastewater, and LiOH is better than LiHCO3 and Li2CO3, and the optimum concentration of LiOH is 200 mg / L, and the COD removal rate reaches the maximum value of 97.4%. The Box-Behnken design was used to study the relationship between the COD removal rate of oily wastewater by various factors. The experimental results showed that the reaction temperature, reaction residence time, catalyst dosage, The amount of oxidant has a great influence on COD removal rate, while temperature has the biggest effect on COD removal rate. The result is the same as that of single factor analysis. The optimum conditions are as follows: reaction temperature 288 掳C, residence time 7 min, catalyst LiOH 133 mg / L, oxidant 188 mg / L, COD removal rate 99%.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703
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本文编号：2000494