Distribution system impacts on microbial diseases.
IWSA international specialized conference. Mülheim an der Ruhr, DEU, 1998/09/28.
The distribution system could play a very significant role in disseminating waterborne disease.
The literature on the subject is scarce and only reports a few cases where outbreaks have been associated with distribution system recontamination.
Reports of coliforms in distribution systems are frequent, but are often associated with bacterial regrowth more than with disease occurrence.
Systems in which a residual disinfectant level is maintained could be giving a false sense of security : coliforms are not very resistant to these disinfectants while viral and parasitic pathogens exhibit a very high degree of resistance.
While the main source of microbial contaminants is probably the raw water and poor treatment, little is known of the fate of microbial contaminants entering the distribution.
A plethora of possible entry points has been described : cross-connections, valves, repairs, pressure losses, etc.
Two Canadian epidemiological studies have suggested that a significant proportion of gastrointestinal illnesses is attributable to tapwater and that the distribution system could play a role.
Mots-clés Pascal : Traitement eau potable, Désinfectant, Réseau adduction eau, Multiplication microorganisme, Exigence sécurité, Caractéristique construction, Soupape, Croisement connexion, Gastroentérite, Classification, Analyse risque, Epidémiologie, Analyse tendance
Mots-clés Pascal anglais : Drinking water treatment, Disinfecting agent, Water supply system network, Microorganism growth, Safety requirement, Construction parameter, Valve, Connection crossing, Gastroenteritis, Classification, Risk analysis, Epidemiology, Trend analysis
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0138007
Code Inist : 001D14J03. Création : 16/11/1999.