The Efficiency of Aspergillus niger and Trichoderma hamatum for bioremediation of soil Contaminated with Nickel and Copper

الملخص

  A Laboratory experiment was carried out to study the effect of soil Inoculation with fungus for bioremediation of soil that Contaminated with heavy metals because this problem has become of great concern due to the adverse effects its causing around the world and the exposure of Iraqi soil in general and agricultural soils in particular to the pollution of heavy metals. Microorganisms have sophisticated methods that enable them to survive in the presence of heavy metals polluting the environment. The study aimed to reduce the impact of heavy metals by used fungi because its environment friendly. So, this study used two species of fungi Aspergillus niger and Trichoderma hamatum which were Isolated from agricultural soil from Al- Fao city in Al- Basrah – Iraq to soil Contaminated with three levels of copper and nickel (0.5, 1, 1.5 of critical concentration). Results showed that these two fungal isolates differ in their efficiency in removing these heavy metals from soil. The two Previous fungi were almost identical in removing nickel, but their suitability differed significantly with Copper, As A. niger surpassed the level and reached 85.47%. The efficiency of removing by fungal isolate decreased with the concentration level of heavy metals and It has effective removal by A. niger with 53.35% at third concentration. Despite the difference in the ability of the two fungi to treat the type of pollutant, and its good in bioremediation, as the contributed to reducing the percentage of pollution.