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Related Experiment Videos

DBP formation kinetics in a simulated distribution system.

L A Rossman1, R A Brown, P C Singer

  • 1National Risk Management Research Laboratory, US Environmental Protection Agency, Cincinnati, OH 45268, USA. rossman.lewis@epa.gov

Water Research
|September 8, 2001
PubMed
Summary
This summary is machine-generated.

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Drinking water disinfection by-products (DBPs) like trihalomethanes can increase in pipes due to organic material in deposits. This suggests pipe deposits, not just chlorine levels, impact DBP formation in distribution systems.

Area of Science:

  • Environmental Chemistry
  • Water Treatment Science
  • Public Health Engineering

Background:

  • Halogenated disinfection by-products (DBPs) form during drinking water chlorination.
  • Limited understanding exists regarding DBP formation kinetics within distribution systems.
  • Pipe materials and associated deposits may influence DBP speciation and concentration.

Purpose of the Study:

  • To investigate the impact of distribution system conditions on the formation of trihalomethanes (THMs) and haloacetic acids (HAAs).
  • To compare DBP production rates in a simulated pipe environment versus static glass bottle conditions.
  • To identify factors contributing to DBP formation in drinking water distribution networks.

Main Methods:

  • Comparative experiments using a simulated pipe flow system and static glass bottles.

Related Experiment Videos

  • Monitoring of chlorine consumption rates in both environments.
  • Quantification of THM and HAA concentrations over time.
  • Analysis of pipe wall deposits for organic precursor material.

    • Main Results:

    • Chlorine consumption was significantly higher in the simulated pipe environment compared to bottles.
    • Haloacetic acid production was not reduced in the pipe environment.
    • Trihalomethane levels increased by an average of 15% in the pipe environment.
    • Pipe wall deposits were identified as a source of organic precursors for THM formation.

    Conclusions:

    • Increased chlorine consumption in distribution systems does not necessarily reduce DBP formation.
    • Pipe wall deposits act as a reservoir for organic precursors, promoting DBP production.
    • DBP formation dynamics in distribution systems are complex and influenced by pipe-water interactions.