Modeling of the release of organic compounds from polyethylene pipes to water

Martin Denberg, Erik Arvin, Ole Hassager

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The use of polyethylene pipes in the distribution network causes contamination of the drinking water. The contaminants are a mixture of phenols, quinones, antioxidants and short polyethylene chains that in general have a functional polar oxygen group. With the use of the film-layer theory and a mass balance for a pipe, an equation is derived to compute the outlet concentration from a given pipe. The equation indicates that if the water in a pipe has a turbulent flow, the water becomes significantly more contaminated by the migrants, compared to water Wittl a laminar flow. The maximum concentration of cofttaminants is predictable, and is equal to the product of the migrants' concentration in the polymer and its partition coefficient at the polymer and water interface. E.g. the maximum obtainable concentration of a stabilizer, as Irganox® 1010, in drinking water exposed to PE pipes used in Denmark is between 0.2 and 0.3 mg/L if no reaction of the added antioxidant has taken place in the pipe extrusion step.
Original languageEnglish
JournalJournal of Water Supply: Research and Technology - AQUA
Volume56
Issue number6-7
Pages (from-to)435-443
Publication statusPublished - 2007

Keywords

  • phenols
  • diffusion
  • hydraulics
  • antioxidants
  • polyethylene (PE) pipes
  • drinking water

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