This paper presents an investigation of the variability of concentrations of Giardia cyst and Cryptosporidium oocyst in two main rivers of Ile-de-France: the Seine (upstream from Paris) and its largest tributary: the Marne. The first goal of this study was to examine risk of presence of Cryptosporidium and Giardia at the drinking water treatment plants' intakes at high concentrations. A second goal was to study the relationship between parasite concentrations and a variety of more easily measured water quality parameters (microbial or physicochemical) which could be used as risk indicators. Two aspects were particularly addressed: the influence of upstream waste water discharges, and the influence of rain fall and river floods on parasite concentrations. Preliminary results of an ongoing study are also presented: they show possible influence of non-point sources on parasite concentrations. Overall results show that parasite sedimentation in rivers is high, urban run-off and resuspension of particles could be at certain times the main factors responsible for peak pathogen levels in raw water.
Source and occurrence of Giardia and Cryptosporidium in Paris rivers
V. Rouquet, F. Homer, J. M. Brignon, P. Bonne, J. Cavard; Source and occurrence of Giardia and Cryptosporidium in Paris rivers. Water Sci Technol 1 April 2000; 41 (7): 79–86. doi: https://doi.org/10.2166/wst.2000.0118
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