Bioremediation can be defined as the process in which microorganisms, mushrooms, green plants or their enzymes are used to bring back the natural environment that has been changed by contaminants to its original state. Bioremediation can be used to attack specific soil pollutants, such as bacterial degradation of chlorinated hydrocarbons. An example of a more general approach is the cleaning of oil ponds by the addition of nitrate and / or sulphate fertilizers to facilitate the decomposition of crude oil by indigenous or exogenous bacteria.
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