查看文章

The River Seine downstream from Paris receives large amounts of ammonium (about 200 μmol/l) from treated and untreated wastewater effluents. In such large river systems, due to the slow growth of nitrifying bacteria, the small size of the nitrifying population present in the water column often represents the limiting factor for nitrification of the contaminating ammonium. In this work we demonstrate that discharge of urban effluents can represent an important seeding of nitrifying bacteria, influencing the dynamics of nitrification in the river downstream. A nitrifying bacteria biomass in wastewater was deduced from H¹⁴CO⁻₃ potential nitrifying activity measurements. these were found to be higher in untreated wastewater (1–200 μgC/l) and in treated effluents (0.8–30 μgC/l) than in the receiving river water (0.5–5 μgC/l). a retrospective analysis of the nitrification process in the River Seine downstream from Paris …