Investigation of the Process of Using Sludge Contaminated With Crude Oil in the Effluent of Chemical Industries

The purpose of this study is to evaluate the effects of increasing sewage sludge as a fertilizer on stimulation of biological processes and rate of bioremediation of crude oil in soils contaminated with this substance in the effluent of chemical companies. refinery wastewater, especially oil refinery, is one of the largest volumes of industrial wastewater produucer. the oil industry around the world produces more than 1.4 million barrels of oil sludge per day, which is a major environmental hazard. if the environment is not considered in the design and operation of refineries, in addition to environmental problems related to air and soil pollution, it will cause surface and groundwater pollution, the scope of which can affect the next few generations. therefore, several solutions have been proposed for treatment of petroleum wastes, which are mentioned in this study. due to limited soil and groundwater resources, soil pollution is one of the most important environmental problems in the world. for this purpose, methods such as direct engineering methods or natural cleaning, i.e. without human intervention in modifying this control, reduce or eliminate pollution from the environment by increasing biological activities of the environment. in addition, by using methods that accelerates decomposition of pollutants such as usage of nitrogen and phosphorus organic matter and plowing for better soil aeration increasing in microbial activity is accelerated.