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Holder, Shima
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Holder, S., Hedenqvist, M. S. & Nilsson, F. (2019). Understanding and modelling the diffusion process of low molecular weight substances in polyethylene pipes. Water Research, 301-309
Open this publication in new window or tab >>Understanding and modelling the diffusion process of low molecular weight substances in polyethylene pipes
2019 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, p. 301-309Article in journal (Refereed) Published
Abstract [en]

Peroxides are widely used as crosslinkers in polyethylene (PE) drinking water pipes. Cross-linked polyethylene (PEX) has better mechanical properties than PE, but peroxide decomposition by-products can migrate from PEX water pipes into the drinking water unless sufficient preventive actions are undertaken. This work systematically examines the migration of tert-Butyl methyl ether (MTBE), a dominating crosslinking by-product from PEX water pipes, into tap water by utilizing both experimental techniques and finite element (FEM) diffusion modeling. The effects of pipe geometry, tap water temperature (23–80 °C), boundary conditions (air or water interface) and degasing (at 180 °C) were considered. The MTBE diffusivity increased strongly with increasing temperature and it was concluded that a desired water quality can be achieved with proper degasing of the PEX pipes. As the FEM simulations were in excellent agreement with the experimental results, the model can accurately predict the MTBE concentration as a function of time, water temperature and PEX pipe geometry, and enable the pipe manufacturers to aid in ensuring desirable drinking water quality.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Crosslinked polyethylene, Diffusion coefficient, Diffusion model, Drinking water, PEX pipes, Polymers, Diffusion, Oxidation, Peroxides, Phase interfaces, Polyethylenes, Temperature, Water pipelines, Water piping systems, Water quality, Drinking water pipes, Experimental techniques, Increasing temperatures, Low molecular weight, Peroxide decomposition, Tert-butyl methyl ethers, Potable water, deionized water, peroxide, polyethylene, polymer, tap water, tert butyl methyl ether, byproduct, decomposition, molecular analysis, MTBE, pipe, plastic, pollution incidence, water temperature, Article, biodegradation, concentration (parameter), cross linking, diffusivity, finite element analysis, heat treatment, mass fragmentography, molecular weight, priority journal, process model, simulation
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-252470 (URN)10.1016/j.watres.2019.03.084 (DOI)000468253500030 ()2-s2.0-85063760634 (Scopus ID)
Note

QC 20190715

Available from: 2019-07-15 Created: 2019-07-15 Last updated: 2019-07-15Bibliographically approved
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