The petroleum industry is one of the most pivotal sectors of the global economy but with it comes the production of atrocious amounts of waste especially during production and refining of the oil. Oil sludge which is an example of such waste has been categorized as hazardous because it is composed of asphaltenes. heavy metals and heavy hydrocarbons such as long-chain paraffins among o... https://nrmles.shop/product-category/gift-card/