Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on Control Disinfection By-products in High Sodium Hypochlorite Generation

고농도 차아염소산나트륨 발생장치의 소독부산물 제어에 관한 연구

  • Received : 2016.07.25
  • Accepted : 2016.12.12
  • Published : 2017.03.01
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Abstract

Sodium hypochlorite used in water disinfection processes is generally in the production of chlorine to 0.8％. As the dose of chlorine increases, disinfection by-products (Chlorate) also increase simultaneously and exceed water quality standards. In this study, the electrolytic cell of a sodium hypochlorite generator (12％ chlorine) was adjusted to control the production of the disinfection by-products. As a result, it was possible to reduce Chlorate concentrations by more than 95％ by adjusting the pH of the electrolytic cell from 1.53 to 4.2 (normal pH of the electrolytic cell). As a low current is required to obtain these results, a 15％ improvement in the efficiency of the positive electrode is also observed. For the development of High Sodium Hypochlorite Generation can be used in a safe sodium hypochlorite solution, which is expected to contribute to improvement in the safety of the disinfection process.

상수도 소독공정에서 사용되고 있는 차아염소산나트륨은 일반적으로 유효염소 0.8 %로 생산되어 투입되고 있으며, 투입량이 많아질수록 소독부산물(Chlorate)이 증가되었고 수질기준을 초과하게 된다. 이에 따라 본 연구에서는 유효염소를 12%로 높인 차아염소산나트륨 발생장치의 전해조에 대해 소독부산물을 제어할 수 있도록 양극수 pH를 조절하였다. 실험결과 전해조 내 양극수 pH를 4.2(일반적인 차아염발생장치 운전 pH)에서 1.53으로 조절함으로서 Chlorate 농도는 95% 이상 낮아진 것으로 나타났으며, 또한 낮은 전류가 인가됨에 따라 양극의 효율도 15% 개선되는 결과를 얻었다. 이 장치의 개발로 대용량 상수도에서도 안전한 차아염소산나트륨의 적용이 가능하여 소독공정의 안전성 향상에 기여할 것으로 기대된다.

Keywords

References

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