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Understanding and modelling the diffusion process of low molecular weight substances in polyethylene pipes
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.ORCID-id: 0000-0002-6071-6241
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Polymera material.ORCID-id: 0000-0002-5010-5391
2019 (engelsk)Inngår i: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, s. 301-309Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier Ltd , 2019. s. 301-309
Emneord [en]
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
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URN: urn:nbn:se:kth:diva-252470DOI: 10.1016/j.watres.2019.03.084ISI: 000468253500030Scopus ID: 2-s2.0-85063760634OAI: oai:DiVA.org:kth-252470DiVA, id: diva2:1337460
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QC 20190715

Tilgjengelig fra: 2019-07-15 Laget: 2019-07-15 Sist oppdatert: 2019-07-15bibliografisk kontrollert

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