Les particules dans les réseaux d'eau potable : caractérisation et impact sur la qualité de l'eau distribuée

Abstract : The nature, concentration, and distribution of particles were evaluated in a large water distribution system both for suspended matter and deposits, to better evaluate their impact on water quality. A constant flux of particles is found penetrating the distribution system from the treatment plant. Concentrations are low (25-50 µ/L dry matter), and mainly consist in organic and biological material. After one year, such concentrations represent on average 1 ton of particles introduced in the network. The transport of water in the network produces particles since suspended matter concentration slightly increases (30-130 µ/L), and loose deposits accumulate in pipes and reservoirs. These deposits are mostly minerais (insolubles, hydroxides, carbonates) resulting not only from the sedimentation of particulate matter, but also probably from the precipitation/flocculation of dissolved and colloidal material, and from the corrosion of the surfaces in contact with water. Organic matter is a minority fraction in deposits (less than 20% on average), but corresponds to concentrations about 1000 times higher than in water, resulting in the accumulation of biomass (2 .5 10[exposant]8 culturable bacteria per gram), leading in some cases to the presence of macro-invertebrates in deposits. By the way, deposits are forming ecosystems which can act as a refuge versus disinfectants carried with water, since organic compounds accumulated in deposits have a high reducing capacity. The accumulation of organic matter and bacteria in deposits does not result from the sedimentation of suspended particles, but merely from the biological growth on dissolved organic matter. The control of microbial problems resulting from the resuspension of deposits in the water phase can thus mainly be achieved by reducing the quantity of dissolved .organic matter introduced in the system.
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Vincent Gauthier. Les particules dans les réseaux d'eau potable : caractérisation et impact sur la qualité de l'eau distribuée. Autre. Université Henri Poincaré - Nancy 1, 1998. Français. ⟨NNT : 1998NAN12004⟩. ⟨tel-01748105⟩

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