基于高效氧化剂的氨法脱硝亚硝酸盐氧化实验研究
Experimental study on nitrite oxidation based on efficient oxidants in ammonia-route denitrification process
分别采用KMnO4和(NH4)2S2O8作为氧化剂,以提升$\mathrm{NO}_{2}^{-}$的氧化效率。重点考察了2种氧化剂对$\mathrm{NO}_{2}^{-}$氧化的影响规律及其在氨法脱硝中的应用。结果表明,与只含氨水相比,KMnO4加入后脱硝率可由60.13%提高至70.11%,$\mathrm{NO}_{3}^{-}$质量浓度由10.58 mg/L升至28.46 mg/L。(NH4)2S2O8可使脱硝率升高至77.18%,$\mathrm{NO}_{3}^{-}$质量浓度升至61.52 mg/L,其氧化效果更为明显。基于响应曲面法(RSM)建立的数学模型表明,氨水的浓度、(NH4)2S2O8浓度和温度均对脱硝效率具有显著影响,最佳工艺参数为氨水浓度0.734 mol/L、(NH4)2S2O8浓度0.014 7 mol/L、温度67.18℃,在该条件下脱硝效率预测值为92.394%,实验值为91.622%,与预测值误差仅为0.772%。
In this study,a new solution is proposed to enhance the oxidation efficiency of $\mathrm{NO}_{2}^{-}$ in ammonia-route denitrification process by using KMnO4 and (NH4)2S2O8,respectively as oxidant.The study focuses on exploring the impact patterns of these two oxidants on $\mathrm{NO}_{2}^{-}$ oxidation and their application in ammonia-route denitrification process.The results show that the denitrification rate can be increased from 60.13% to 70.11% due to the addition of KMnO4,and $\mathrm{NO}_{3}^{-}$ concentration increases from 10.58 mg/L to 28.46 mg/L compared with using NH3-H2O only.Using (NH4)2S2O8 can improve the denitrification rate to 77.18%,and makes $\mathrm{NO}_{3}^{-}$ concentration rise to 61.52 mg/L,showing a more obvious oxidizing effect.According to the mathematical model established on the basis of response surface methodology,it is shown that the concentration of ammonia,(NH4)2S2O8 concentration and temperature all have a significant impact on the denitrification efficiency.The optimal process parameters include ammonia concentration of 0.734 mol/L,(NH4)2S2O8 concentration of 0.014 7 mol/L,and temperature of 67.18℃.Under these conditions,the predicted denitrification efficiency is 92.394% and the experimental one is 91.622%,representing an error of 0.772% only.
氨法脱硝 / 响应曲面法 / 单变量实验 / 氧化剂筛选 / 亚硝酸盐氧化
ammonia-route denitrification / response surface methodology / univariate experiment / oxidant screening / nitrite oxidation
| [1] |
|
| [2] |
|
| [3] |
|
| [4] |
|
| [5] |
|
| [6] |
|
| [7] |
冉佳. 臭氧氧化结合碱液吸收法脱硫脱硝过程研究[D]. 北京: 中国石油大学, 2020. |
| [8] |
孙云雪. 臭氧氧化结合氨水吸收实现多污染物控制的实验研究[D]. 北京: 华北电力大学, 2011. |
| [9] |
应孟悦. 液相亚硝酸盐高级氧化工艺实验研究[D]. 杭州: 浙江大学, 2018. |
| [10] |
|
| [11] |
|
| [12] |
丁卫, 胡小芳, 张建国. 次氯酸钠氧化法去除水体中亚硝酸盐的应急技术研究[J]. 供水技术, 2010, 4(3):9-11. |
| [13] |
|
| [14] |
|
| [15] |
何辉, 祁贵生, 刘有智, |
| [16] |
|
| [17] |
|
基于有机催化物的低温烟气氨法脱硫脱硝一体化技术研究(GJNY2030XDXM-19-12.4)
/
| 〈 |
|
〉 |