A Novel Method Based on Hydrodynamic Cavitation for Improving Nitric Oxide Removal Performance of NaClO 2

Liguo Song (), Yuhang Wei, Chengqi Deng, Jingang Yang, Hao Sui, Feng Guo, Lingrun Meng, Xingda Zhao, Shiping Wei, Deping Sun, Zhitao Han, Minyi Xu and Xinxiang Pan
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Liguo Song: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Yuhang Wei: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Chengqi Deng: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Jingang Yang: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Hao Sui: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Feng Guo: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Lingrun Meng: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Xingda Zhao: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Shiping Wei: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Deping Sun: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Zhitao Han: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Minyi Xu: Marine Engineering College, Dalian Maritime University, Dalian 116026, China
Xinxiang Pan: School of Electronics and Information Technology, Guangdong Ocean University, Zhanjiang 524088, China

IJERPH, 2023, vol. 20, issue 4, 1-18

Abstract: In the removal of nitric oxide (NO) by sodium chlorite (NaClO 2 ), the NaClO 2 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 NaClO 2 for wet denitrification. Under optimal experimental conditions, when 3.0 L of NaClO 2 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 (NO x ) 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 ClO 2 by NaClO 2 is affected by pH. The initial NO x removal efficiency was 84.8–54.8% for initial pH = 4.00–7.00. The initial NO x removal efficiency increases as the initial pH decreases. When the initial pH was 3.50, the initial NO x removal efficiency reached 100% under the synergistic effect of HC. Therefore, this method enhances the oxidation capacity of NaClO 2 through HC, realizes high-efficiency denitrification with low NaClO 2 concentration (1.00 mmol/L), and has better practicability for the treatment of NO x from ships.

Keywords: hydrodynamic cavitation; NaClO 2; wet removal of NO; ship; exhaust gas treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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