Abstract

Microbubbles (MBs) can spontaneously generate hydroxyl radicals (·OH) with high oxidizing capacity. In this study, a novel oxidation-absorption process based on a microbubble system in the indirect removal mode was proposed for the simultaneous removal of nitric oxide (NO) and sulfur dioxide (SO2). In this process, an air microbubble water system (AMBW) was produced by a microbubble generator (MBG) inhaling air and tap water and injected into an oxidation-absorption column reactor by the MBG, meanwhile the mixed gas composed of NO and SO2 passed through a micron-sized gas distributor at the bottom of the reactor and flowed into the AMBW. Important parameters including initial pH and temperature of tap water, operation time, NO concentration, SO2 concentration, and NaCl concentration were assessed to investigate the feasibility of the AMBW for the simultaneous removal of NO and SO2. The results showed that ·OH generated from the collapsed MBs played a critical role in the removal and the simultaneous removal of NO and SO2 was successfully achieved with the AMBW. Even with only tap water used as the absorbent, the removal efficiencies of NO and SO2 reached 92.7% and above 99%, respectively, when the experiment conditions were initial water pH 11.5, initial water temperature 298 K, 600 ppm NO, and 3,000 ppm SO2. Compared with the microbubble system in the direct removal mode, this new system is more suitable for the treatment of flue gases with low NO concentration and high volume. Moreover, this novel process should have a good prospect of industrial application in the flue gas treatment due to its high efficiencies of desulfurization and denitration and some advantages such as low usage cost of the reagents, simple system, and small occupation space.

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Data Availability Statement

No data, models, or code were generated or used during the study.

Acknowledgments

The authors gratefully acknowledge financial support from the Iron and Steel Joint Research Fund of National Natural Science Foundation-China BaoWu Steel Group Co., Ltd. (Grant No. U1660107), the Fundamental Research Funds for the Central Universities and Graduate Student Innovation Fund of Donghua University (Grant No. CUSF-DH-D-2019077), and Shanghai Municipal Bureau of Ecology and Environment, People’s Republic of China.

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Go to Journal of Environmental Engineering
Journal of Environmental Engineering
Volume 146Issue 9September 2020

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Received: Jan 17, 2020
Accepted: Apr 24, 2020
Published online: Jul 14, 2020
Published in print: Sep 1, 2020
Discussion open until: Dec 14, 2020

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Zhengguo Xiao, Ph.D. [email protected]
College of Environmental Science and Engineering, Donghua Univ., Songjiang Campus, Room 4171, No. 2999, North Renmin Rd., Songjiang District, Shanghai 201620, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Univ., Shanghai 201620, China. Email: [email protected]
Bacherlor, College of Environmental Science and Engineering, Donghua Univ., Songjiang Campus, Room 4171, No. 2999, North Renmin Rd., Songjiang District, Shanghai 201620, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Univ., Shanghai 201620, China. Email: [email protected]
Graduate Student, College of Environmental Science and Engineering, Donghua Univ., Songjiang Campus, Room 4171, No. 2999, North Renmin Rd., Songjiang District, Shanghai 201620, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Univ., Shanghai 201620, China. ORCID: https://orcid.org/0000-0002-9861-6043. Email: [email protected]
Rongliang Zhang [email protected]
Graduate Student, College of Environmental Science and Engineering, Donghua Univ., Songjiang Campus, Room 4171, No. 2999, North Renmin Rd., Songjiang District, Shanghai 201620, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Univ., Shanghai 201620, China. Email: [email protected]
Hongrui Sun, Ph.D. [email protected]
College of Environmental Science and Engineering, Donghua Univ., Songjiang Campus, Room 4171, No. 2999, North Renmin Rd., Songjiang District, Shanghai 201620, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Univ., Shanghai 201620, China. Email: [email protected]
Dengxin Li, Ph.D. [email protected]
College of Environmental Science and Engineering, Donghua Univ., Songjiang Campus, Room 4171, No. 2999, North Renmin Rd., Songjiang District, Shanghai 201620, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji Univ., Shanghai 201620, China (corresponding author). Email: [email protected]
Fanfeng Pan [email protected]
Director, China New Energy (Shanghai) Limited Company, Bldg. 10, No. 160, Taiyuan Rd., Xuhui District, Shanghai 200031, China. Email: [email protected]

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