A Novel Method Based on Hydrodynamic Cavitation for Improving Nitric Oxide Removal Performance of NaClO2

In the removal of nitric oxide (NO) by sodium chlorite (NaClO2), the NaClO2 concentration is usually increased, and an alkaline absorbent is added to improve the NO removal efficiency. However, this increases the cost of denitrification. This study is the first to use hydrodynamic cavitation (HC) co...

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Bibliographic Details
Published in:International journal of environmental research and public health 2023-02, Vol.20 (4), p.3684
Main Authors: Song, Liguo, Wei, Yuhang, Deng, Chengqi, Yang, Jingang, Sui, Hao, Guo, Feng, Meng, Lingrun, Zhao, Xingda, Wei, Shiping, Sun, Deping, Han, Zhitao, Xu, Minyi, Pan, Xinxiang
Format: Article
Language:English
Subjects:
Cavitation
Denitrification
Efficiency
Energy consumption
Experiments
Flow velocity
Flue gas
Gases
Nitric oxide
Nitrogen oxides
Oxidation
Photochemicals
Reagents
Ships
Sodium chlorite
Synergistic effect
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Summary:In the removal of nitric oxide (NO) by sodium chlorite (NaClO2), the NaClO2 concentration is usually increased, and an alkaline absorbent is added to improve the NO removal efficiency. However, this increases the cost of denitrification. This study is the first to use hydrodynamic cavitation (HC) combined with NaClO2 for wet denitrification. Under optimal experimental conditions, when 3.0 L of NaClO2 with a concentration of 1.00 mmol/L was used to treat NO (concentration: 1000 ppmv and flow rate: 1.0 L/min), 100% of nitrogen oxides (NOx) could be removed in 8.22 min. Furthermore, the NO removal efficiency remained at 100% over the next 6.92 min. Furthermore, the formation of ClO2 by NaClO2 is affected by pH. The initial NOx removal efficiency was 84.8–54.8% for initial pH = 4.00–7.00. The initial NOx removal efficiency increases as the initial pH decreases. When the initial pH was 3.50, the initial NOx removal efficiency reached 100% under the synergistic effect of HC. Therefore, this method enhances the oxidation capacity of NaClO2 through HC, realizes high-efficiency denitrification with low NaClO2 concentration (1.00 mmol/L), and has better practicability for the treatment of NOx from ships.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph20043684