臭氧催化氧化处理化工外排水的研究

发布时间：2018-04-26 23:24

本文选题：臭氧 + 催化氧化　；参考：《兰州交通大学》2015年硕士论文

【摘要】：石油化工行业在我国经济发展中具有举足轻重的地位,其在保持快速发展的同时,带来的环境问题也不容忽视,尤其是对水环境的破坏。随着国家消减主要污染物排放总量工作的开展以及石化行业污染物的排放标准的逐步提高,传统的技术方法很难满足越来越严的要求。因此,为了更加合理地利用和节约水资源,贯彻国家环境减排政策,探索应用方便和经济有效的新技术迫在眉睫。由于臭氧催化氧化技术具有处理效果好、无二次污染等优点被广泛应用于给水处理、污水处理等方面,所以,该技术越来越得到人们的重视,有很好的应用前景。因此,在阅读大量文献的基础上,本论文采用臭氧催化氧化技术对化工外排水进行处理,结果将为化工外排水在石油化工类企业中水回用项目的推广提供参考依据和技术支持。首先,用自制催化剂处理苯酚和草酸溶液,研究表明,自制Al2O3-Mn催化剂对苯酚和草酸两种模拟的污染物都有一定的吸附作用,其余5种催化剂的吸附能力较差。Al2O3-Mn催化氧化作用对苯酚的去除率达到了50%,并且实验结果稳定,催化剂稳定性高。催化剂Al-Cu0530和G-Mn0603催化氧化草酸的效果随着时间的延长逐渐降低。Al2O3-Cu催化剂对草酸的去除率较低,Al2O3-Ti和Al2O3-Mn催化剂对草酸的去除率分别可达到60%和52%。因此,综合考虑,Al2O3-Mn催化剂的实验效果较好。然后,对市购的6种催化剂进行筛选,发现HWS-X和PX催化剂对废水中COD有很好的去除效果。因此,对HWS-X和PX催化剂在废水处理中的最佳工艺参数进行了优化。发现HWS-X催化剂在臭氧一次加入,浓度为35 mg/L,投加时间为15 min,停留时间为30 min,保持原水pH值,催化剂填装量为600 mL的条件下实验效果最佳。PX催化剂的最优实验条件为:臭氧一次加入,浓度为35 mg/L,投加时间为20 min,停留时间为30 min,原水pH值,催化剂填装量为500 mL。在最优实验条件下,HWS-X催化剂和PX催化剂对COD的降低值分别约为62.0和30.7 mg/L。随着实验次数的增加,HWS-X催化剂的催化氧化效果先升高后保持稳定,而PX催化剂则不断降低。吸附饱和的HWS-X催化剂经过三次催化氧化实验后,其效果和新催化剂的效果接近,其吸附作用对COD的降低值也达到了54.3 mg/L。最后,单独臭氧氧化对化工外排水中COD的去除率随着反应时间的延长呈逐渐增加的趋势。当反应时间为30 min时,单独臭氧氧化对COD的去除率仅为7.54%。当用催化剂处理化工外排水时,Al2O3-Mn催化剂对有机物的去除率较低。反应时间为10 min时,HWS-X催化剂反应体系中COD和TOC值突然升高,和原水相比,出水的COD值增加了11.53%。然后,出水中COD和TOC值随着反应时间的延长逐渐下降。所有出水的UV254值和pH值保持不变。当采用大量的HWS-X催化剂处理化工外排水时其出水的COD均能满足国家新的排放标准。由此可见,HWS-X催化剂和臭氧联用具有很好的催化氧化效果。并且发现,自制Al2O3-Mn催化剂在处理化工外排水时和市购的PX催化剂能力相当。
[Abstract]:The petrochemical industry plays an important role in the economic development of our country. While maintaining the rapid development, the environmental problems can not be ignored, especially the damage to the water environment. With the development of the total emission of the main pollutant discharge and the gradual improvement of the emission standards of the petrochemical industry, the traditional It is difficult to meet the demands of more and more strict technology. Therefore, in order to use and save water resources more rationally, implement the national environmental emission reduction policy, explore the new technology which is convenient and economical and effective. As the ozone catalytic oxidation technology has the advantages of good treatment and no two pollution, it is widely used in water treatment and pollution. Therefore, the technology has been paid more and more attention and has a good application prospect. Therefore, on the basis of reading a lot of literature, this paper uses the ozone catalytic oxidation technology to treat the chemical external drainage. The result will provide reference for the promotion of the water reuse project in the petrochemical industry. And technical support. First, using the self-made catalyst to treat phenol and oxalic acid solution, the study shows that the self-made Al2O3-Mn catalyst has a certain adsorption effect on two simulated pollutants of phenol and oxalic acid, the other 5 kinds of catalysts have poor adsorption capacity, and the removal rate of phenol by.Al2O3-Mn catalytic oxidation is 50%, and the experimental results are stable. As the catalyst Al-Cu0530 and G-Mn0603 catalyze the oxidation of oxalic acid with time, the removal rate of oxalic acid by.Al2O3-Cu catalyst is lower and the removal rate of oxalic acid by Al2O3-Ti and Al2O3-Mn catalysts can reach 60% and 52%., respectively. The effect of Al2O3-Mn catalyst is better than that of Al2O3-Mn catalyst. After screening 6 kinds of catalyst purchased in the city, it was found that HWS-X and PX catalyst had good removal effect on COD in wastewater. Therefore, the optimum process parameters of HWS-X and PX catalyst in wastewater treatment were optimized. It was found that the HWS-X catalyst was added to the ozone once, the concentration was 35 mg /L, the time was 15 min, and the residence time was 30 min, and the retention time was 30 min. With the pH value of the original water and the catalyst filling amount of 600 mL, the optimum experimental conditions for the optimum.PX catalyst are: ozone once added, the concentration is 35 mg/L, the time is 20 min, the residence time is 30 min, the pH value of the original water, the filling amount of the catalyst are 500 mL. in the optimal test condition, and the HWS-X and PX catalysts are reduced to COD. The results are about 62 and 30.7 mg/L., respectively, with the increase of the number of experiments, the catalytic oxidation effect of the HWS-X catalyst increases first and the PX catalyst decreases. After three catalytic oxidation experiments, the effect of the adsorbed HWS-X catalyst is close to the effect of the new catalyst, and the decrease of the adsorption effect on COD is also 5. 4.3 mg/L. finally, the removal rate of COD in chemical external drainage is gradually increasing with the prolongation of the reaction time. When the reaction time is 30 min, the removal rate of COD by the single ozone oxidation is only 7.54%. when the catalyst is used to treat the chemical drainage with the catalyst, the removal rate of the organic matter is lower than that of the Al2O3-Mn. At 10 min, the value of COD and TOC increased suddenly in the reaction system of HWS-X catalyst. Compared with the original water, the COD value of the effluent was increased by 11.53%., and the value of COD and TOC in the effluent decreased gradually with the prolongation of the reaction time. The UV254 value and pH value of all the effluent remained unchanged. It can be seen that the HWS-X catalyst and the combined use of ozone have a good catalytic oxidation effect. It is found that the self-made Al2O3-Mn catalyst has the same capacity as the PX catalyst purchased by the city in the treatment of chemical drainage.

【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X78

【参考文献】