دراسة الظروف المثلى لإزالة العناصر المعدنية الثقيلة من المحاليل المائية الملوثة باستعمال بكتريا Bacillus subtilis المعزولة محليا

Abstract EN

We studied the effect of certain environmental conditions for removing heavy metal elements from contaminated aqueous solutions (Cd, Cu, Pb, Fe, Zn, Ni, Cr) using the bacterium Bacillus subtilis to appoint the optimal conditions for removal ,The best optimum temperature range for two isolate was 30-35○C while the hydrogen number for the maximum mineral removal range was 6-7.

The best primary mineral removal was 100 mg/L, while the maximum removal for all minerals was obtained after 6 hrs of Cu element time and the maximum removal efficiency was obtained after 24 hrs of Cu element.

The results have proved that the best aeration for maximum removal was obtained at rotation speed of 150 rpm/minute.

Inoculums of 5ml/100ml which contained 106 cell/ml showed maximum removal for two isolates.

The removal efficiency was (%) under the obtained optimum conditions above using the bacterial isolate Bacillus subtilis 88.4, 91.9, 98.1, 96.7, 83.1, and 94.8 for the minerals Cd, Cu, Pb, Fe, Zn and Ni consequently.

The maximum removal for Cr element under the optimum conditions was 92.1% by using Bacillus subtilis 2 isolate.