J Korean Soc Environ Anal Search


Published online August 12, 2023.
Disinfection effects and disinfection by-products generation characteristics of a continuous hypochlorous acid water producing device using citric acid as a pH control agent
Jihoon Lee, Jiyoon Kim, Kyungtae Kim, Yeojoon Yoon 
Yonsei University Mirae Campus, Wonju-si, Korea
Correspondence:  Yeojoon Yoon, Tel: +82 033 760 2461, Fax: 0000, 
Email: yajoony@yonsei.ac.kr
Received: 8 August 2023   • Accepted: 12 August 2023
The use of disinfectants and disinfecting devices is increasingly common in homes, as they help prevent the development and spread of pathogens while improving hygiene. Common disinfectants used for disinfection include chlorine compounds, alcohol, quaternary ammonium compounds, etc., but chlorine compounds are easy to manufacture and are commonly used in the form of sodium hypochlorite. When chlorine compounds are dissolved in water, free chlorine is divide into hypochlorous acid and hypochlorite ions, with different molar fractions depending on the PH. It is crucial to maintain a high fraction of hypochlorous acid by adjusting the pH, as it is more than 100 times more effective as a disinfectant than hypochlorite ions. However, due to the chemical nature of its conversion to hypochlorite ions, hypochlorous acid is not very stable, making it more efficient to prepare and use it at the point of use. In this study, we determined the optimum conditions for producing electrolyzed water using citric acid as a pH adjuster. We built a device capable of producing electrolyzed water containing hypochlorous acid continuously, and analyzed the efficiency of the produced electrolyzed water through disinfection tests and measurements of disinfection by-products.
Key Words: Electrolyzed water, Continuous production, Hypochlorous acid, Citric acid, Disinfection by-product


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