The use of crossflow microfiltration in wastewater treatment is limited because of membrane fouling as a result of the colloidal fraction. A large part of this colloidal fraction can be converted into a settleable particulate fraction through a pretreatment combining electrocoagulation and aeroflotation. Permeation flow with a 0.1 μm microporous membrane increases from 0.02 m 3 /m 2 h for untreated water to a value approaching 0.35 m 3 /m 2 h for pretreated water L'utilisation d'une microfiltration tangentielle en traitement d'eaux usees est limitee par le colmatage de la membrane due a la fraction colloidale. Un pretraitement associant une electrocoagulation et une aeroflottation, permet de transformer une grande partie de cette fraction colloidale en fraction particulaire decantable. Le flux de permeation sur une membrane microporeuse de 0.1 μm passe alors de 0.02 m 3 /m 2 h sur une eau brute a une valeur proche de 0.35 m 3 /m 2 h sur une eau pretraitee
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