Bioremediation is the use of biological treatment to destroy or reduce the concentration of hazardous wastes from a contaiminated sites. such system involves the uses of biological organisms such as bacteria fungi and plants, to reduce or eliminate toxic pollutants from contaminated sites by degradation assimilation or transpiration in the atmosphere is called bioremediation degradation is the mode of elimination mostly in case of organic compounds while heavy metals are assimilated. These microbes and higher plants can also be variously modified by genetic engineering to become efficient and suitable for bioremediation.