Study on disinfection by-products formation according to kind of salt in on-site production

Min, Byung-Dae; Chung, Hyen-Mi; Kim, Tae-Wook; Park, Juhyun

doi:10.11001/jksww.2015.29.5.575

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…이러 한 액화염소의 사고 가능성을 해소하기 위해 2000대 초반부터 동일한 소독성능을 가지고 있으면서도 안전한 차아염소산나트 륨을 이용하는 정수장이 증가하고 있는 추세이다. 2,3) 대표적인 차아염소산나트륨 제조는 선택적 이온교환막을 이용하여 소금 을 전기분해하면 염소가스와 가성소다가 생성되고, 생성된 염소 가스와 가성소다를 혼합하여 일정 농도의 차아염소산나트륨 (12% 이상)을 제조하게 된다. 4) 또한 현장제조형 발생기는 소금 물을 전기분해하여 저농도(1% 이하) 차아염소산나트륨을 만드 는 것으로, 기본적인 원리는 양극에서는 염소(Cl 2 )가 생성되고, 음극에서는 수산화나트륨(NaOH)이 생성되며, 염소와 수산화 나트륨이 반응하여 차아염소산나트륨을 제조하는 것으로 기본 적인 반응식은 다음과 같다.…”

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A Study on the Optimal Management Technology of the On-site Sodium Hypochlorite Generator for Disinfection By-products Reduction

Park¹,

Yoon²,

Park³

et al. 2022

J Korean Soc Environ Eng

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Objectives : The purpose of this study is to suggest operating conditions that can minimize the disinfection by-products of sodium hypochlorite produced in on-site sodium hypochlorite generators.Methods : The characteristics of disinfection by-products were investigated by operating conditions (dissolved water type, brine concentration, temperature of electrolytic cell inflow water, pH of electrolytic cell inflow water and electrolyzer current density) using a on-site sodium hypochlorite generator(5 kg/day).Results and Discussion : The concentration of disinfection by-products (chlorate, bromate) according to the type of dissolved water was found to be high in the order of softened water > tap water > RO treated water. As the brine concentration increased, chlorate decreased and bromate increased. The optimal saline concentration was found to be 3% or more. As temperature of electrolytic cell inflow water increases,, chlorate decreases and bromate increases. The difference in the concentration of disinfection by-products(chlorate, bromate) according to the pH of electrolytic cell inflow water is not large, and the appropriate pH is determined to be about 7 when the free available chlorine and disinfection by-products are taken into account. Also, as the current density increases, the chlorate increases and bromate showed a decreasing trend.Conclusion : It has been shown that the concentration of disinfection by-products can be minimized when operating within the operating range suggested by the on-site sodium hypochlorite generator manufacturer, and some operating conditions are thought to have been suggested by the manufacturer to protect the electrolyzer cells. As the market for on-site sodium hypochorite generator gradually expands, it is expected that improved facilities will be continuously released in consideration of the stricter standards for disinfection by-products.

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A Study on the Optimal Management Technology of the On-site Sodium Hypochlorite Generator for Disinfection By-products Reduction

Park¹,

Yoon²,

Park³

et al. 2022

J Korean Soc Environ Eng

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Experimental Study on the Relationship Between the Change of Free available Chlorine and the Increase Rate of Disinfection by-products according to Operating Conditions of three Types of Sodium Hypochlorite

Park¹,

Yoon²,

Park³

et al. 2022

J Korean Soc Environ Eng

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Objectives : This study was conducted to suggest field operating conditions that can minimize disinfection by-products for three types of sodium hypochlorite.Methods : In this study, changes in free available chlorine, chlorate and bromate were analyzed according to storage temperature, storage time and presence or absence of sunlight for three types of sodium hypochlorite(two types of bleach and one type of sodium hypochlorite made on-site hypochlorite generator).Results and Discussion : In the case of bleach with 12% free available chlorine, when operating with a target of 10% of more of free available chlorine, the storage time for each storage temperature was 3 days at 40℃, 13 days at 30℃, 27 days at 20℃, 85 days at 10℃, and 200 days at 5℃. In the case of bleach with 5% free available chlorine, when operating with a target of 4% of more of free available chlorine, the storage time for each storage temperature was 37 days at 35℃, 255 days at 20℃, 1,343 days at 10℃, and 4,821 days at 4℃. In the case of sodium hypochlorite with 0.8% free available chlorine made on-site hypochlorite generator, when operating with a target of 0.7% of more of free available chlorine, the storage time for each storage temperature was 10 days at 3 5℃, 42 days at 20℃, 470 days at 10℃, and 1,770 days at 4°C. As a result of evaluating the quality change according to the presence or absence of UV protection, the free available chlorine decreased rapidly when exposed to sunlight, whereas the free available chlorine decreased slowly in the case of indoor storage.Conclusion : Bleach with 12% free available chlorine can be stored for about 60 days at 15℃, and bleach with 5% free available chlorine can be used within about 6 months at 15℃. And sodium hypochlorite with 0.8% free available chlorine can be used within 10 days at room temperature. In addition, when storing sodium hypochlorite, it is suggested that it be stored indoors protected from sunlight.

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Study on disinfection by-products formation according to kind of salt in on-site production

Cited by 2 publications

References 10 publications

A Study on the Optimal Management Technology of the On-site Sodium Hypochlorite Generator for Disinfection By-products Reduction

A Study on the Optimal Management Technology of the On-site Sodium Hypochlorite Generator for Disinfection By-products Reduction

Experimental Study on the Relationship Between the Change of Free available Chlorine and the Increase Rate of Disinfection by-products according to Operating Conditions of three Types of Sodium Hypochlorite

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