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Application of corrosion inhibitors to water distribution systems

  • Park, Yong-Il (Department of Environmental Engineering, Konkuk University) ;
  • Woo, Dal-Sik (Korea Interfacial Science and Engineering Institute) ;
  • Cho, Young-Tai (Faculty of Biotechnology, Chung Cheong College) ;
  • Jo, Kwan-Hyung (Department of Civil and Environmental Engineering, Chungwoon University) ;
  • Nam, Sang-Ho (Department of Environmental Engineering, Konkuk University)
  • Published : 2002.06.01

Abstract

The current study evaluated the disinfection efficiency of free chlorine and chloramine for microorganisms on various pipe materials, such as copper, galvanized steel, carbon steel, and stainless steel. In addition, the effect of internal pipe corrosion and corrosion inhibitors on the bactericidal efficiency was evaluated using a simulated loop. For disinfection with a phosphate corrosion inhibitor, chloramination was found to be more effective than chlorination due to its persistence. Free chlorine disinfection was optimized with a high phosphoric acid concentration, while chloramine disinfection was optimized with a high phosphoric acid or low polyphosphate concentration. In simulated copper and galvanized steel loop tests, chloramination with phosphoric acid was demonstrated to be more effective.

Keywords

chloramination;disinfection;inhibitor;corrosion;distribution system

References

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