低压湿式氧化降解模拟石油废水的研究

发布时间：2018-05-16 09:57

  本文选题：湿式催化氧化 + 喹啉　； 参考：《浙江海洋大学》2017年硕士论文

【摘要】：湿式氧化法因其适用范围广、处理效率高、降解彻底且无二次污染等特点,现在已经广泛应用于难降解工业废水的处理。尽管该法处理效果较好,但在实际应用中也受到诸多限制,例如反应需要在高温高压的条件下进行,对设备材质要求苛刻,处理成本高。针对此类问题,本论文采用新型催化剂钛硅分子筛,用喹啉模拟高氮石油废水,在低压中温的条件下进行湿式氧化反应,得出了最佳工艺条件及催化剂再生条件,并对反应动力学进行了探究,得到动力学模型,最后对湿式催化氧化处理废水进行了工艺设计及经济估算。采用单因素实验法研究表明,在温度150℃,初始pH为7,H2O2投加量为20ml/L,催化剂投加量为4g/L的最佳工艺条件下,反应60 min喹啉转化率为97%,COD去除率为85%,喹啉模拟石油废水可通过湿式催化法有效地去除。对失活催化剂进行XRD、BET分析,结果表明失活催化剂并未发生骨架坍塌,仍具有完整的骨架结构,其失活原因是有机物堵塞了分子筛的孔道。失活催化剂经550℃高温培烧后,其比表面积、孔比表面积和孔容均能恢复到新鲜催化剂水平,催化剂的重复利用性能优异。分析动力学模型,得知影响反应速率的最大因素是H2O2的投加量,初始pH值对于反应速率的影响最弱。论文最后对湿式氧化处理石油废水进行了工艺设计与经济估算,结果表明,湿式催化氧化运行成本为21.5元/m3,该工艺具有良好的经济效益。
[Abstract]:Because of its wide range of application, high efficiency, complete degradation and no secondary pollution, wet oxidation has been widely used in the treatment of refractory industrial wastewater. Although the effect of this method is good, it is also limited in practical application, for example, the reaction needs to be carried out under the condition of high temperature and high pressure, the material requirement of the equipment is strict, and the treatment cost is high. In order to solve this problem, a new catalyst, titanium-silicon molecular sieve, was used to simulate high-nitrogen petroleum wastewater in this paper. The wet air oxidation reaction was carried out at low pressure and medium temperature, and the optimum conditions for catalyst regeneration were obtained. The reaction kinetics was studied and the kinetic model was obtained. Finally, the process design and economic estimation of wet catalytic oxidation for wastewater treatment were carried out. The results of single factor experiment showed that under the optimum conditions of temperature 150 鈩，

本文编号：1896402