Gromaire M C, Kafi-Benyahia M, Gasperi J, Saad M, Moilleron R, Chebbo G
Université Paris-Est, Cereve, UMR-MA102-AgroParisTech, Marne-la-Vallée, France.
Water Sci Technol. 2008;58(12):2453-65. doi: 10.2166/wst.2008.835.
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.
本文报道了在巴黎合流制排水系统不同深度采集的大量雨天径流（WWF）样本中，总悬浮固体（TSS）以及颗粒污染物（化学需氧量（COP）、溶解性化学需氧量（PDCO）、总凯氏氮（PTKN）、总铜（PCu）、总铅（PPb）、总锌（PZn）、多环芳烃（PPAH））的沉降速度。记录的V30（0.01至0.1毫米/秒）和V50（0.09至0.6毫米/秒）值比旱季污水的值高出10倍，也超过了路面径流测量值。然而，这些值通常低于法国设计雨天径流沉降设施时考虑的0.28毫米/秒的参考值。从小型上游集水区到大型下游集水区，沉降性能呈下降趋势。颗粒污染物的沉降行为因所考虑的参数而异，并且由于微污染物在不同颗粒类别上的分布不均匀，可能与总悬浮固体的行为有显著差异。锌（PZn）和总凯氏氮（PTKN）的沉降性能远低于总悬浮固体，而多环芳烃（PPAH）的沉降性能更高。
