An internal circulation iron–carbon micro-electrolysis reactor for aniline wastewater treatment: Parameter optimization, degradation pathways and mechanism

doi:10.1016/j.cjche.2023.05.009

Chinese Journal of Chemical Engineering ›› 2023, Vol. 63 ›› Issue (11): 96-107.DOI: 10.1016/j.cjche.2023.05.009

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An internal circulation iron–carbon micro-electrolysis reactor for aniline wastewater treatment: Parameter optimization, degradation pathways and mechanism

Yanhe Han¹, Han Xu¹, Lei Zhang^1,2, Xuejiao Ma¹, Yang Man³, Zhimin Su¹, Jing Wang¹

1. Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;
2. SUEZ Environmental Technology (Beijing) Company Limited, Beijing 100026, China;
3. Beijing Ecological Environment Assessment and Complaint Center, Beijing 100006, China

Received:2023-01-29 Revised:2023-04-28 Online:2024-01-08 Published:2023-11-28
Contact: Yanhe Han,E-mail:hanyanhe@bipt.edu.cn;Xuejiao Ma,E-mail:maxuejiao@bipt.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (21677018), the Joint Fund of the Beijing Municipal Natural Science Foundation and Beijing Municipal Education Commission (KZ201810017024) and the Cross–Disciplinary Science Foundation from Beijing Institute of Petrochemical Technology (BIPTCSF–22032205003/014).

An internal circulation iron–carbon micro-electrolysis reactor for aniline wastewater treatment: Parameter optimization, degradation pathways and mechanism

Yanhe Han¹, Han Xu¹, Lei Zhang^1,2, Xuejiao Ma¹, Yang Man³, Zhimin Su¹, Jing Wang¹

1. Department of Environmental Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;
2. SUEZ Environmental Technology (Beijing) Company Limited, Beijing 100026, China;
3. Beijing Ecological Environment Assessment and Complaint Center, Beijing 100006, China

通讯作者: Yanhe Han,E-mail:hanyanhe@bipt.edu.cn;Xuejiao Ma,E-mail:maxuejiao@bipt.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (21677018), the Joint Fund of the Beijing Municipal Natural Science Foundation and Beijing Municipal Education Commission (KZ201810017024) and the Cross–Disciplinary Science Foundation from Beijing Institute of Petrochemical Technology (BIPTCSF–22032205003/014).

Abstract

Abstract: Aniline is a vital industrial raw material. However, highly-toxic aniline wastewater usually deteriorated effluent quality, posed a threat to human health and ecosystem safety. Therefore, this study reported a novel internal circulation iron-carbon micro-electrolysis (ICE) reactor to treat aniline wastewater. The effects of reaction time, pH, aeration rate and iron-carbon (Fe/C) ratio on the removal rate of aniline and the chemical oxygen demand were investigated using single-factor experiments. This process exhibited high aniline degradation performance of approximately 99.86% under optimal operating conditions (reaction time = 20 min, pH = 3, aeration rate = 0.5 m³·h^-1, and Fe/C = 1:2). Based on the experimental results, the response surface method was applied to optimize the aniline removal rate. The Box-Behnken method was used to obtain the interaction effects of three main factors. The result showed that the reaction time had a dominant effect on the removal rate of aniline. The highest aniline removal rate was obtained at pH of 2, aeration rate of 0.5 m³·h^-1 and reaction time of 30 min. Under optional experimental conditions, the aniline content of effluent was reduced to 3 mg·L^-1 and the removal rate was as high as 98.24%, within the 95% confidence interval (97.84%-99.32%) of the predicted values. The solution was treated and the reaction intermediates were identified by high-performance liquid chromatography, ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, gas chromatography-mass spectrometry, and ion chromatography. The main intermediates were phenol, benzoquinone, and carboxylic acid. These were used to propose the potential mechanism of aniline degradation in the ICE reactor. The results obtained in this study provide optimized conditions for the treatment of industrial wastewater containing aniline and can strengthen the understanding of the degradation mechanism of iron-carbon micro-electrolysis.

Key words: Aniline, Iron-carbon micro-electrolysis, Circulating fluidized bed, Waste water, Degradation

摘要： Aniline is a vital industrial raw material. However, highly-toxic aniline wastewater usually deteriorated effluent quality, posed a threat to human health and ecosystem safety. Therefore, this study reported a novel internal circulation iron-carbon micro-electrolysis (ICE) reactor to treat aniline wastewater. The effects of reaction time, pH, aeration rate and iron-carbon (Fe/C) ratio on the removal rate of aniline and the chemical oxygen demand were investigated using single-factor experiments. This process exhibited high aniline degradation performance of approximately 99.86% under optimal operating conditions (reaction time = 20 min, pH = 3, aeration rate = 0.5 m³·h^-1, and Fe/C = 1:2). Based on the experimental results, the response surface method was applied to optimize the aniline removal rate. The Box-Behnken method was used to obtain the interaction effects of three main factors. The result showed that the reaction time had a dominant effect on the removal rate of aniline. The highest aniline removal rate was obtained at pH of 2, aeration rate of 0.5 m³·h^-1 and reaction time of 30 min. Under optional experimental conditions, the aniline content of effluent was reduced to 3 mg·L^-1 and the removal rate was as high as 98.24%, within the 95% confidence interval (97.84%-99.32%) of the predicted values. The solution was treated and the reaction intermediates were identified by high-performance liquid chromatography, ultraviolet-visible spectroscopy, Fourier-transform infrared spectroscopy, gas chromatography-mass spectrometry, and ion chromatography. The main intermediates were phenol, benzoquinone, and carboxylic acid. These were used to propose the potential mechanism of aniline degradation in the ICE reactor. The results obtained in this study provide optimized conditions for the treatment of industrial wastewater containing aniline and can strengthen the understanding of the degradation mechanism of iron-carbon micro-electrolysis.

关键词: Aniline, Iron-carbon micro-electrolysis, Circulating fluidized bed, Waste water, Degradation

Yanhe Han, Han Xu, Lei Zhang, Xuejiao Ma, Yang Man, Zhimin Su, Jing Wang. An internal circulation iron–carbon micro-electrolysis reactor for aniline wastewater treatment: Parameter optimization, degradation pathways and mechanism[J]. Chinese Journal of Chemical Engineering, 2023, 63(11): 96-107.

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An internal circulation iron–carbon micro-electrolysis reactor for aniline wastewater treatment: Parameter optimization, degradation pathways and mechanism

An internal circulation iron–carbon micro-electrolysis reactor for aniline wastewater treatment: Parameter optimization, degradation pathways and mechanism

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