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The maintenance of a required water quality in a water supply system is
a difficult and complex issue. Physical, chemical and biological processes occurring
during the water’s flow through a water supply network depends on many factors.
The hazard of the secondary growth of microorganisms in a water environment
appears practically always and can cause a water quality worsening. That problem
is often observed and hard to solve. The water quality is also directly related to the
condition of a water supply network, its realization, exploitation time and
conditions, condition of water installations and applied pipe’s material. Plastic
materials are susceptible to degradation processes due to a loads effecting,
temperature or many others environmental factors. In order to counteract
the polymer's degradation process, stabilizers of a different kind are added to
plastics. These are mainly heat, lead or ultraviolet light radiation stabilizers,
plasticizers, separating agents and others. These compounds or products of their
degradation can migrate into water contacting with pipe's material, what can
influence the quality of a drinking water.
The purpose of this paper is to present results of a water quality analysis in
selected rural water supply system, located in a district of a distinctly agricultural
character. The whole system was built of unplasticized polyvinyl chloride (PVCU)
material. The paper presents basic chemical and microbiological analysis of
water and test of suspended sediment in water. The executed tests included also
the influence of pipe's material on the water quality. Analysed water samples were
taken from specific sampling points, selected in accordance to a preliminary
calibrated numerical model of a considered water supply network.
Obtained test's results revealed that among examined physic-chemical
indicators the biggest changes were observed in sampling points of the highest
water age. In some samples, the indicators values exceed permissible limits.
Obtained numerical values could be burden of a notable calculation error due to
the slight weight of materialized sediments.
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