As the principal objective, this present study compares the purifying performances of the membrane bioreactor
(MBR) with the conventional activated sludge used from the wastewater treatment plant of Beni Messous (Algiers) with
the average characteristics in the chemical oxygen demand being 586 mg/L and 188 mg/L in the biochemical oxygen demand
and 14 NTU of turbidity. The membrane bioreactor received the domestic wastewater in side stream with an ultrafiltration
membrane under the following conditions: mixed liquor suspended solids concentration 4g/L; cross flow velocity
U= 4m/s at constant transmembrane pressure 0.8 bar. The results obtained show a better elimination of carbonaceous
pollution and suspended solids (SS) for the MBR with COD final value equal to 10 mg/L and 2 mg/L in BOD5 and
0,3 mg/ L for SS. For the conventional activated sludge, we obtained a final value equal to 77 mg/L for the COD and 18
mg/L for BOD5 and 25 mg/L for SS.
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