Evaluating the Risk of Infection from the Presence of Giardia and Cryptosporidium in Drinking Water

摘要: Monte-Carlo simulations were performed in order to quantify the microbiological risk arising from presence of Giardia and Cryptosporidium drinking water. A two-year survey 45 utilities located on a portion St. Lawrence River (Quebec, Canada) allowed us collect information required for this assessment: parasite occurrence data, treatment performances daily unboiled water consumption. For conventional treatment, mean annual infection with was found be approximately eight times higher than Giardia. The confirm that clarification process plays an important role reduction health associated protozoan parasites. In fact, case Cryptosporidium, impact chemical disinfectants (O3 or Cl2) appears minimal cold conditions prevailing Quebec. According simulations, 45% (for treatment+O3) 51% treatment) individuals are exposed proposed USEPA guideline (1 per 10[emsp4 ]000 year).