Abstract
One of the most valuable wastes of the oil industry is oil sludge, found at oil wells, oil pipelines and refineries, and stored in storage units. Oil sludge has many similarities with heavy oil components. This study evaluates the use of oil sludge from the Iranian Oil Pipelines and Telecommunication Company for the manufacture of asphalt. The approximate structure of the oil sludge was analyzed and compared with the structure of conventional bitumen for road construction. Marshall asphalt samples were analyzed according to the American Society for Testing and Materials D1559 0–5–7.5–10–12.5 standard using 15% oil sludge with bitumen and aggregate. To study the physical characteristics of samples of Marshall asphalt, two important tests were performed (1) to determine the pressure resistance, and (2) the relative deformation of examples of all samples. The results showed that asphalt resistance is increased using 25–50% sulfur and 2–7% butadiene styrene polymer. Therefore, Marshall asphalt samples with 30% sulfur were prepared with bitumen and oil sludge. Fifty percent oil sludge in bitumen and a 2% polymer and 15% oil sludge mix with bitumen gave the best results. These mixtures are economically viable.
Highlights
During drilling, transportation and refining of crude oil, oil sludge is produced
Test to determine the temperature of combustion of bitumen mixed with oil sludge Various percentages of oil sludge were added to the bitumen and the temperature of combustion determined for all samples according to ASTM D92
By increasing the ratio of oil sludge to bitumen a series of chemical reactions between bitumen and petroleum sludge occurred that was followed by decreased stability of bitumen and ignition of gases at lower temperatures
Summary
Transportation and refining of crude oil, oil sludge is produced. During the biological treatment of industrial chemical wastewater, surplus biological sludge is always produced. At oil refineries, both oil sludge and biological sludge are produced on a daily basis. Oil sludge produced in oil refineries contains organic and inorganic substances that are different from other refinery products, and factors such as crude oil composition, size and age of the refinery have an effect on these (Kai et al 1985). One of the major environmental problems associated with all oil industries, including refineries, petrochemical plants, mines and transportation terminals, is oil sludge containing
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