The inhibitive effect of lead concentration on the biological treatment of wastewater of oil well drillings

This work consists in studying the influence of the lead inhibitive concentration on the biological treatment of wastewater of the oil well drilling by a bioreactor filled with an inert solid support. The concentrations varied from 80 to 100 mg/L for reaching the inhibitive concentration of the gas–oil biodegradation process. The experimental results showed that the best yield of the gas–oil elimination of 80.84% was obtained for the lead initial concentration equal to 80 mg/L and it was about 78% with the initial concentration in lead equal to 100 mg/L.