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An experimental study on the simultaneous removal of NO and SO2 with a new wet recycling process based on the micro-nano bubble water system

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Abstract

The micronano bubble water system (MNBW) generated by a micronano bubble generator (MNBG) has the superior oxidation properties and can improve gas solubility. In the study, a new wet recycling process based on MNBW is proposed to simultaneously remove nitric oxide (NO) and sulfur dioxide (SO2). The important experimental parameters such as initial water pH, initial water temperature, NO and SO2 concentrations, and the presence of oxygen (O2) were investigated to explore the feasibility of desulfurization and denitration with MNBW. The experimental results showed that decreasing initial water pH or increasing initial water temperature and NO and SO2 concentrations were not conducive to the removal of NO or SO2. O2 could promote the removal of NO, but it had no effect on SO2 removal. In addition, SO2 removal efficiency always remained high and did not change obviously during the experimental period. However, NO removal efficiency gradually decreased in the first 50 min and then became stable.

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Funding

This work was supported by the Iron and Steel Joint Research Fund of National Natural Science Foundation-China BaoWu Steel Group Co., Ltd. (No. U1660107), the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University (No. CUSF-DH-D-2019077), and Shanghai Municipal Bureau of Ecology and Environment, People’s Republic of China.

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Correspondence to Dengxin Li.

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Xiao, Z., Li, D., Zhang, R. et al. An experimental study on the simultaneous removal of NO and SO2 with a new wet recycling process based on the micro-nano bubble water system. Environ Sci Pollut Res 27, 4197–4205 (2020). https://doi.org/10.1007/s11356-019-07136-0

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Keywords

  • Wet process
  • NO
  • SO2
  • Desulfurization
  • Denitration
  • Micro-nano bubble