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Article Dans Une Revue Water Science and Technology Année : 2008

Settling velocity of particulate pollutants from combined sewer wet weather discharges.

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Résumé

Settling velocities of TSS and of particulate pollutants (COP, PDCO, PTKN, PCu, PPb, PZn, PPAH) measured on a wide range of wet weather flow (WWF) samples collected at different levels of the Parisian combined sewer system are reported. The recorded V30 (0.01 to 0.1 mm s(-1)) and V50 (0.09 to 0.6 mm s(-1)) values exceed by a factor 10 those of dry weather sewage and also exceed the values measured for pavement runoff. These values lie however often below the 0.28 mm s(-1) reference value considered in France for the design of WWF settling facilities. A decrease in settleability is observed between a small upstream catchment and larger scaled downstream catchments. The settling behaviour of particulate pollutants varies depending on the considered parameter and can differ significantly from the TSS behaviour, due to a non homogeneous distribution of micropolluants over the different classes of particles. PZn and PTKN appear far less settleable than TSS, whereas PPAH show higher settleability.
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Dates et versions

hal-00676414 , version 1 (05-03-2012)

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Marie-Christine Gromaire, M. Kafi-Benyahia, Johnny Gasperi, M. Saad, R. Moilleron, et al.. Settling velocity of particulate pollutants from combined sewer wet weather discharges.. Water Science and Technology, 2008, 58 (12), pp.2453-65. ⟨10.2166/wst.2008.835⟩. ⟨hal-00676414⟩
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