การบำบัดน้ำมันหล่อลื่นที่ใช้แล้วด้วยกรดอะซิติกพร้อมกับการดูดซับโลหะหนักด้วยถ่านกัมมันต์จากผักตบชวา
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Abstract
Abstract
In this research, the treatment of used lubricating oil by acetic acid and heavy metals adsorption with activated carbon from water hyacinth have been studied. The response surface methodology (RSM) based on Central Composite Design (CCD) was used to investigate the effects of two parameters, such as the amounts of acetic acid and the reaction temperature, on the acid sludge removal. The regression quadratic equation has been presented to show the relation between the percentage of acid sludge removal and two parameters. The results revealed that the reaction temperature is the important parameter. The optimum conditions were: 11.2 %v acetic acid and the reaction temperature of 45 °C with the reaction time of 60 min. The acid sludge removal under the optimized conditions was 15.30 %. In addition, the adsorption of heavy metals in acid treated oils has been compared. It was found that adsorption with activated carbon from water hyacinth can reduce the amount of heavy metals rather than that of adsorption with activated clay. The content of lead, iron and zinc remained at 11.25, 0.34 and 366 ppm, respectively.
Keywords: used lubricating oil; acetic acid; activated carbon from water hyacinth; acid sludge removal; response surface methodology
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References
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