Abstract

• Frying of foods is the most commonly used in the food preparation. Without any treatment, the fried oil can be used for a few days and must be discarded after such time. The useful life of fried palm oil can be increased by the refining with various adsorbents, natural adsorbents and modified adsorbents. In this paper, the natural bentonite clay and modified acid activated bentonite clay were used for refining of waste fried palm oils. The natural bentonite clay was collected from Kyaukpadaung Township. The essential parameters such as acid value, peroxide value, iodine value and saponification value of before and after refined fried oils were investigated. The completely refined fried oil showed the properties of the acid value, peroxide value, iodine value and saponification values were evenly spread between 1.39 to 1.54 mg g-1 , 2.28 to 2.62 meq kg-1 , 100.33 to 109.75 mg g-1 and 142.72 to 152.73 mg KOH g-1 respectively. These results were under permitted level for edible palm oil. Moreover, the determination of incremental adsorption capacity of acid activated bentonite clay sample using 3 % H2SO4, it can be resilient in refining process within 18h long frying time of waste fried palm oil. This experimental work found that locally available natural bentonite clay can be modified for the use of efficient and effective refining material to the waste fried palm oil.