What Is The Risk Of Plastic Pipe Long-Term Degradation On Water Quality?
B. Rabaud, J. Baron, A. Ragot, A. Bruchet, and K. Glucina
Posters # 2012 Barcelona
Plastic piping products present the advantage of not being affected by electrochemical
corrosion. However, they can be severely degraded after long-term service by oxidation
process notably in presence of chlorinated disinfectant. This study was conducted in
order to investigate the impact of plastic pipe degradation on water quality. Polyethylene
(PE) connections, with various service times from water networks disinfected by chlorine
and chlorine dioxide were collected. In parallel, new pipes made with PE, cross-linked PE
and unplasticized polyvinyl chloride, were aged in an accelerated manner using an
ageing bench. Results confirmed plastic pipe degradation by oxidation following their
exposure to disinfectant notably chlorine dioxide. Testing performed on pipes aged on the
bench showed that water quality can be severely impacted in certain circumstances
following polyolefin pipe degradation. However, testing performed on in-situ pipes did not
highlight a link between the deterioration of water organoleptic properties and pipe
degradation level. Lastly, waters in contact with all plastic pipes contained few organic
compounds notably antioxidant by-products.
Ageing, Disinfectant, Drinking Water, Organic Pollutant, Plastic Pipe, Taste-and-Odor
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