Optimization of the N2 generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis

doi:10.1016/j.cjche.2018.12.007

中国化学工程学报 ›› 2019, Vol. 27 ›› Issue (12): 3010-3016.DOI: 10.1016/j.cjche.2018.12.007

• Energy, Resources and Environmental Technology • 上一篇下一篇

Optimization of the N₂ generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis

Zhijuan Niu^1,2, Sitao Zhang¹, Yanhe Han¹, Mengmeng Qi¹

1 Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;
2 Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China

收稿日期:2018-07-26 修回日期:2018-11-19 出版日期:2019-12-28 发布日期:2020-03-17
通讯作者: Yanhe Han
基金资助:
Supported by the National Natural Science Foundation of China (21677018) and the Joint Fund of the Beijing Natural Science Foundation and Beijing Municipal Education Commission (KZ201810017024).

Optimization of the N₂ generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis

Zhijuan Niu^1,2, Sitao Zhang¹, Yanhe Han¹, Mengmeng Qi¹

1 Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;
2 Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China

Received:2018-07-26 Revised:2018-11-19 Online:2019-12-28 Published:2020-03-17
Contact: Yanhe Han
Supported by:
Supported by the National Natural Science Foundation of China (21677018) and the Joint Fund of the Beijing Natural Science Foundation and Beijing Municipal Education Commission (KZ201810017024).

摘要/Abstract

摘要： The reduction of nitrate using internal circulation micro-electrolysis technology (ICE) was investigated. The effect of the reaction time, initial pH, Fe/C ratio, and aeration rate on the nitrate reduction was investigated using a single factor experiment. Based on the results of the single factor experiment, a response surface methodology (RSM) was applied to optimize the N₂ generation selectivity. The effects and interactions of three independent variables were estimated using a Box-Behnken design. Using the RSM analysis, a quadratic polynomial model with optimal conditions at pH=8.8, Fe/C=1:1, and an aeration rate of 30 L·min^-1 was developed by means of the regression analysis of the experimental data. Using the RSM optimization, the optimal conditions yielded a N₂ generation selectivity of 72.0%, which is in good agreement with experimental result (73.2%±0.5%) and falls within the 95% confidence interval (IC:66.8%-77.3%) of the model results. This indicates that the model obtained in this study effectively predicts the N₂ generation selectivity for nitrate reduction by the ICE process, thus providing a theoretical basis for process design.

关键词: Nitrate reduction, Internal circulation micro-electrolysis, Response surface methodology, N₂

Abstract: The reduction of nitrate using internal circulation micro-electrolysis technology (ICE) was investigated. The effect of the reaction time, initial pH, Fe/C ratio, and aeration rate on the nitrate reduction was investigated using a single factor experiment. Based on the results of the single factor experiment, a response surface methodology (RSM) was applied to optimize the N₂ generation selectivity. The effects and interactions of three independent variables were estimated using a Box-Behnken design. Using the RSM analysis, a quadratic polynomial model with optimal conditions at pH=8.8, Fe/C=1:1, and an aeration rate of 30 L·min^-1 was developed by means of the regression analysis of the experimental data. Using the RSM optimization, the optimal conditions yielded a N₂ generation selectivity of 72.0%, which is in good agreement with experimental result (73.2%±0.5%) and falls within the 95% confidence interval (IC:66.8%-77.3%) of the model results. This indicates that the model obtained in this study effectively predicts the N₂ generation selectivity for nitrate reduction by the ICE process, thus providing a theoretical basis for process design.

Key words: Nitrate reduction, Internal circulation micro-electrolysis, Response surface methodology, N₂

Zhijuan Niu, Sitao Zhang, Yanhe Han, Mengmeng Qi. Optimization of the N₂ generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis[J]. 中国化学工程学报, 2019, 27(12): 3010-3016.

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Optimization of the N₂ generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis

Optimization of the N₂ generation selectivity in aqueous nitrate reduction using internal circulation micro-electrolysis

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