Abstract

Lipids raise handicap in the treatment of wastewaters in the purification stations. For that, we studied the aerobic biological treatment of greases of synthetic wastewater and restaurant wastewater by selected and optimized bacteria consortium. The results of this work highlighted the beneficial effect of the adaptation of bacteria which was evaluated by the study of chemical oxygen demand (COD) abatement and greases removal in the synthetic medium by using an adapted and not adapted biomass. The adapted biomass allowed a rate of abatement of 84.28 and 93.3% of the COD and greases removal respectively against 51.88 and 66.6% by the not adapted biomass. The biodegradation of the lipid-rich wastewater of restaurant by adapted bacteria gave satisfactory results. Indeed, we recorded an elimination of 83.3% of the COD and 81% of greases. The results obtained also revealed the importance of our bacterial consortium in the biodegradation of greases.

Key words: Greases, biodegradation, lipid-rich wastewater, aerobic treatment and chemical oxygen demand (COD).