Water wastes released from the crude oil processing and petrochemical effluents are characterized by large amounts of hydrocarbons, crude oil products, polycyclic and aromatic hydrocarbons, metal derivatives, surface-active substances, sulphides and other chemicals. They lead to the accumulation of the toxic products in the waste-water and cause deleterious effects to the ecosystem reported the positive correlation between pollutants from the refinery and effects on the aquatic inhabitants and microflora.