Experimental investigation of hydroxyl radicals in high concentration for killing biological aerosol pathogens in indoor air

化学工业与工程

Chemcial Industry and Engineering

2024, Vol. 41

Issue (4) :109-116 DOI: 10.13353/j.issn.1004.9533.20220834

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Experimental investigation of hydroxyl radicals in high concentration for killing biological aerosol pathogens in indoor air

WANG Shuai, KUANG Xinyi, ZHAO Ziqin, LIAO Hongguo, CUI Zhengwei

Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, Jiangsu, Wuxi 214122, China

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Abstract Environmental safety issues such as air disinfection and sterilization caused by COVID-19 have become hot spots that need to be solved urgently. In this study, a spiral cutter was used to nanoscale bubble and prepare a high-concentration ozone water in a circulation device. Then combined it with a counterflow packing filter, the novel air sterilization rig was set up for killing biological aerosol pathogens in air. The effects of different pH values and temperatures on ozone water concentration and hydroxyl radical concentration were then investigated. The experimental results show that the concentration of ozone water after equilibrium can reach 11.65 m·L^-1 and the concentration of hydroxyl radical reaches 95.84 μmol·L^-1 under the condition of pH=7 and temperature of 25 ℃. The effects of different pH, temperature, spray flow and wind speed on the sterilization rate were further explored. The experimental results show that the sterilization rates of 20, 40 and 60 min are 77.3%, 87.6% and 96.7%, respectively under the conditions of pH=7, temperature 25 ℃, spray flow rate 500 L·h^-1 and wind speed of 2.5 m·s^-1. Therefore, the current high-concentration ozone water circulation device combined with the packing filter has a good sterilization effect for air sterilization.

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	WANG Shuai
	KUANG Xinyi
	ZHAO Ziqin
	LIAO Hongguo
	CUI Zhengwei

Keywords： ozone hydroxyl radicals counterflow packing filter biological aerosol pathogens sterilization rate

Received 2022-11-16;

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WANG Shuai, KUANG Xinyi, ZHAO Ziqin, LIAO Hongguo, CUI Zhengwei.Experimental investigation of hydroxyl radicals in high concentration for killing biological aerosol pathogens in indoor air[J] Chemcial Industry and Engineering, 2024,V41(4): 109-116

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