Direct conversion of NO and SO2 in flue gas into fertilizer using ammonia and ozone

Yujin Hwang; Abid Farooq; Hyung Won Lee; Seong-Ho Jang; Sung Hoon Park; Myong-Hwa Lee; Seuk Cheun Choi; Young-Kwon Park

doi:10.1016/j.jhazmat.2020.122581

Direct conversion of NO and SO₂ in flue gas into fertilizer using ammonia and ozone

J Hazard Mater. 2020 Oct 5:397:122581. doi: 10.1016/j.jhazmat.2020.122581. Epub 2020 May 8.

Authors

Yujin Hwang¹, Abid Farooq¹, Hyung Won Lee¹, Seong-Ho Jang², Sung Hoon Park³, Myong-Hwa Lee⁴, Seuk Cheun Choi⁵, Young-Kwon Park⁶

Affiliations

¹ School of Environmental Engineering, University of Seoul, Seoul 02504, South Korea.
² Department of BioEnvironmental Energy, Pusan National University, Miryang 50463, South Korea.
³ Department of Environmental Engineering, Sunchon National University, Suncheon 57922, South Korea.
⁴ Department of Environmental Engineering, Kangwon National University, Chuncheon 24341, South Korea.
⁵ Clean Energy System R&D Department, Korea Institute of Industrial Technology, Cheonan 31056, South Korea.
⁶ School of Environmental Engineering, University of Seoul, Seoul 02504, South Korea. Electronic address: catalica@uos.ac.kr.

PMID: 32417605
DOI: 10.1016/j.jhazmat.2020.122581

Abstract

This study focused on the simultaneous removal of NO and SO₂ from an industrial flue gas stream. To evaluate the removal efficiency of NO and SO₂ using O₃ and NH₃, the consumption of two reactants (O₃ and NH₃) in line with the conversion of NO and SO₂ was quantified experimentally. In addition, NO and SO₂ were converted to valuable fertilizers, NH₄NO₃ and (NH₄)₂SO₄. To identify a principle strategy to enhance the generation of fertilizer, Fourier transform infrared spectroscopy was used to examine the reaction mechanisms for the formation of NH₄NO₃ and (NH₄)₂SO₄. Acceleration of SO₂ oxidation could be achieved effectively by adding NO to a gas mixture of SO₂, NH₃, and O₃. The formation of HNO₃ might be enhanced by the simultaneous feeding of NO and SO₂. Particle generation was also 10 times higher for NH₃/(NO + SO₂) than for NH₃/NO and for NH₃/SO₂, which is a prominent feature of this study. Moreover, the introduction of steam had a positive influence on particle generation. This method offers dual applications for NO and SO₂ removal from a flue gas stream and direct fertilizer generation.

Keywords: Ammonium nitrate; Ammonium sulfate; Fertilizers; NO and SO(2) removal in waste flue gas; Ozone.

Publication types

Research Support, Non-U.S. Gov't