电-Fenton法处理TNT生产废水的研究

发布时间：2018-07-02 12:45

本文选题：电-Fenton法 + TNT生产废水　；参考：《沈阳理工大学》2017年硕士论文

【摘要】：TNT生产废水是一种难降解、排量大的有机废水。本文选用某军工厂去酸后的生产废水,以COD和总硝基化合物去除率为指标,使用自行设计的电解槽为发生装置,采用电-Fenton法对其进行降解,作为预处理的方法。主要内容如下:通过查阅文献确定阳极采用钛镀钌铱极板,通过研究石墨和钛两种阴极材料对TNT生产废水COD去除率的影响,确定阴极采用钛极板,此时体系的处理效果稳定。通过单因素实验确定各影响因素的最佳值为:U=6V、CFe~(2+)=1.2mmol/L、nH_2O_2:nFe~(2+)=20:1、C_(Na_2SO_4) = 10g/L、pH=3、曝气量Q = 300L/h、D = 6cm、反应时间 t = 30min 。在单因素实验的基础上,固定反应条件:pH=3、C_(Na_2SO_4)=10g/L、t = 30min,进行了 L16(45)的正交实验,确定影响水样降解效果的因素主次水平为极板间距Fe~(2+)的投加量曝气量 nH_2O_2:nFe~(2+)电解电压。根据正交结果,确定了反应条件的最优组合,经验证性实验得到COD和总硝基化合物的去除率分别为69.0225%和97.12%。建立了电-Fenton法降解TNT生产废水的动力学模型,得出该过程符合二级反应动力学,以COD浓度为考察指标,经回归分析得到二级拟合方程为:Ct=(?),相关系数 R_2 =0.9909推测TNT生产废水中硝基化合物的降解历程为:①苯环上的硝基逐步被还原成羟基:-NO_2→-NO → -NHOH_4→-NH_2→-OH。②苯环上的甲基逐步被氧化成羟基:-CH_3→CHO→-CH_2OH →-COOH→-OH③苯环发生断链反应,生成含有醛基、羧基等长链的中间产物,最后降解为H_2O、CO_2及小分子有机物化合物。
[Abstract]:TNT production wastewater is a kind of organic wastewater which is difficult to degrade and have large displacement. In this paper, the wastewater after acid removal in a military factory is used as an indicator of the removal rate of COD and total nitro compounds, using a self designed electrolyzer as a device, and using electrical -Fenton to degrade it as a pretreatment method. The main contents are as follows: through Cha Yuewen The titanium plating ruthenium and iridium plate was used for the determination of the anode, and the effect of the two cathode materials on the removal rate of COD in TNT production wastewater was studied. The titanium plate was used to determine the cathode. The effect of the system was stable at this time. The best values of the factors were determined by the single factor experiment: U=6V, CFe~ (2+) =1.2mmol/L, nH_2O_2:nFe~ (2+) =20:1, C_ (Na_2SO_4). ) = 10g/L, pH=3, aeration Q = 300L/h, D = 6cm, reaction time t = 30min. On the basis of a single factor experiment, a fixed reaction condition: pH=3, C_ (Na_2SO_4) =10g/L, and the orthogonal experiment is carried out to determine the main level of the factors affecting the degradation effect of the water sample. According to the orthogonal results, the optimal combination of reaction conditions was determined. The removal rate of COD and total nitro compounds was 69.0225% and 97.12%. respectively. The kinetic model of -Fenton degradation of TNT wastewater was established by the confirmatory experiment. It was concluded that the process accorded with the two stage reaction kinetics, and the COD concentration was used as the investigation index and the regression analysis was used. The two level fitting equations are as follows: Ct= (?) and the correlation coefficient R_2 =0.9909 speculates that the degradation process of nitro compounds in TNT production wastewater is: (1) the nitro compounds on the benzene ring are gradually reduced to hydroxyl groups: -NO_2, -NO, -NHOH_4, -NH_2 to -OH. (2) methyl gradually oxidize to hydroxyl groups: -CH_3, CHO, -CH_2OH, -CH_2OH, tertiary and benzene ring hair A chain reaction was formed to produce intermediates containing aldehydes and carboxyl groups, and finally degraded into H_2O, CO_2 and small organic compounds.
【学位授予单位】：沈阳理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X789

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