par Lucas, F;Thérial, Claire;Goncalves, A.;Servais, Pierre ;Rocher, Vincent;Mouchel, J.M.
Référence Environmental science and pollution research international, 21, 8, page (5318-5328)
Publication Publié, 2014
Article révisé par les pairs
Résumé : The microbiological quality of urban wastewaters presents important environmental, sanitary, and political challenges.However, the variability of untreated wastewater quality is seldom known when it comes to microbial parameters.This study aims to evaluate the variability of microbiological quality in wastewater influents from different wastewatertreatment plants connected to combined and partially separate sewer networks in the Parisian area and to evaluate the impactof this variability on the treatment efficiency and on the accuracy of wastewater effluent monitoring. The densities offecal indicator bacteria (FIB), Escherichia coli and intestinal enterococci, and their partitioning on settleable particles wereanalyzed at the inlet of two wastewater treatment plants during dry weather (130 composite samples and 7 days sampledevery 2 hours) and storm events (39 composite samples, and 7 rain courses) from 2008 to 2012. The results showed thatfecal indicator densities vary according to the network characteristics and according to the meteorological conditions.During storm events, a significant dilution of E. coli and enterococci was observed, as well as a decrease in thesettleable fraction of E. coli during the maximal impact of the storm. However, storm events did not significantly impactthe regular FIB monitoring. FIB removals by primary and secondary treatment were significantly correlated with FIBdensities in influent wastewater; however, meteorological conditions also influenced the removal of FIB.