Background: Ultrafiltration membrane processes have become an established
technology in the treatment and reuse of secondary effluents. Nevertheless, membrane fouling
arises as a major obstacle in the efficient operation of these systems.
Aim/Objective: This study evaluates the factors affecting pretreatment conditions for combination
ultrafiltration membrane processes for reuse of secondary effluent from the sewage
treatment plant. The objective of this work is to study the precoagulation effect on the removal
of organic matter from secondary effluent from the wastewater treatment plant
Reghaïa (Algiers) and for fouling of the membranes ultrafiltration.
Methods: A comparison was made between two coagulant FeCl3 and Fe2(SO4)3 using two
processing systems, Coagulation (with sedimentation) / Ultrafiltration and Coagulation
(without sedimentation) / Ultrafiltration. The optimum conditions for coagulation were determined
by the analysis UV254 and turbidity.
Result: The results showed that there's a better reduction of the decrease of permeate flux
(Jv) in the coagulation system (without sedimentation)/Ultrafiltration for both coagulants
because of trapping of organic molecules responsible for fouling of the membrane inside the
porous flocs formed in the coagulation.