CELLS IMMOBILIZATION OF SOME MICROORGANISMS AS A TOOL FOR BIOREMEDIATION : B- ASPERGILLUS NIGER

Abstract

Abstract Current study included the use of immobilization technique (using sodium alginate and calcium chloride) for Fungi (Aspergillus niger) and studying their efficiency in treating some heavy metals such as Lead and cadmium. Standard solutions of lead and cadmium at concentrations (10, 20 and 30) ppm were used. Heavy metals concentrations were measured by atomic absorption device and the correlation between the heavy metals and the immobilized cells was measured by FTIR &SEM techniques. The results of current study show the lead concentrations after treatment by immobilized Aspergillus niger were (6.75, 11.6 and 13.9) ppm respectively, and the removal efficiency was (32.4,42and 54)%. Cadmium Concentrations after treatment were (3.7, 6.16 and 8.62 ) ppm respectively, whereas removal efficiency in was (63,69 &71)% respectively. Current study showed a correlation between cells & heavy metals which principally included with bioadsorption surface for it and that morphological alterations in cells were occur because of the bioadsorption for heavy metals and the porous that found on cells surface that lead to enter the heavy metals to inner surface and increase the removal efficiency, all results of SEM were appear alteration in the surface cells shape by binding the lead and cadmium at the surfaces.