Contribution of treated wastewater to the microbiological quality of Seine River in Paris

Water Research
Laurent MoulinAurélien Dumètre

Abstract

Urban part of Seine River serving as drinking water supply in Paris can be heavily contaminated by Cryptosporidium spp. and Giardia duodenalis. In the absence of agricultural practice in this highly urbanized area, we investigated herein the contribution of treated wastewater to the microbiological quality of this river focusing on these two parasites. Other microorganisms such as faecal bacterial indicators, enteroviruses and oocysts of Toxoplasma gondii were assessed concurrently. Raw wastewaters were heavily contaminated by Cryptosporidium and Giardia (oo)cysts, whereas concentrations of both protozoa in treated wastewater were lower. Treated wastewater, flowed into Seine River, had a parasite concentration closed to the one found along the river, in particular at the entry of a drinking water plant (DWP). Even if faecal bacteria were reliable indicators of a reduction in parasite concentrations during the wastewater treatment, they were not correlated to protozoal contamination of wastewater and river water. Oocysts of T. gondii were not found in both raw and treated wastewater, or in Seine River. Parasitic contamination was shown to be constant in the Seine River up to 40 km upstream Paris. Altogether, these results strong...Continue Reading

References

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Citations

May 15, 2012·Analytical and Bioanalytical Chemistry·Ivo SafarikMirka Safarikova
Sep 25, 2015·Environmental Science and Pollution Research International·R MosteoM P Ormad
May 20, 2011·Environmental Science & Technology·Nicolas RadomskiFrançoise S Lucas
Nov 27, 2015·Journal of Water and Health·Suma George MulamattathilMoses Mbewe
Apr 10, 2020·Parasites & Vectors·Cláudia S MarquesJosé Manuel Correia da Costa

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