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


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.


  1. Modeling of chlorine inactivation of pipe biofilms Haas, C. N.;M. W. LeChevallier;M. Gooffrey
  2. Jour. AWWA v.82 no.7 Disinfection biofilms in a model distribution system Lechevallier, M. W.;C. D. Lowry;R. G. Lee
  3. Appl. Environ. Microbiol. v.53 no.12 Examination and characterization of distribution system biofilms LeChevallier, M. W.;T. M. Babcock;R. G. Lee
  4. Proceedings of AWWA WQTC Detecting and eliminating coliform regrowth Lowther, E. D.;R. H. Moser
  5. Jour. AWWA v.74 Factors affecting coliform bacteria growth in distribution systems Martin, R. S.
  6. Appl. & Envir. Microbiol. v.54 no.10 Inactivation of biofilm bacteria LeChevallier, M. W.;C. D. Cawthorn;R. G. Lee