THE USE OF SPENT BLEACHING EARTH (SBE) AS AN ADSORBENT TO REDUCE FREE FATTY ACIDS IN WASTE COOKING OIL

High free fatty acids in waste cooking oil can interfere with the re-use of oil. Therefore, absorption technique is one way that reduce contained Aim: The purpose this study to find out ability Reactivated Spent Bleaching Earth (RSBE) adsorb be biodiesel products. In study, was collected from fried food sellers Bekasi, while spent bleaching earth (SBE)-one solid wastes produced by refinery palm industry as an adsorbent-was PT X. For (RSBE), redundant used 0.7 M HNO3. To obtain optimum products, applied variation time (i.e., 30, 45, 60, 75, and 90 minutes) concentration (6%, 9%, 12%, 15%, 18%). Methodology results: Results indicated temperature minutes were maximum 15% optimal combination 0.65%. Conclusion, significance, impact study: values water ash contents RSBE also meet quality standard activated carbon adsorbent for purification content SBE less than 3% considered not a toxic hazardous waste. it reused without pre-treatment. addition, found there changes pore on surface SBE, both activated. conclude, absorbent absorb