Abstract. The purpose of this research was to find out the best adsorbent and column height that can adsorb color and soluble impurities substances in used cooking oil. This research was meant for knowledge development of refined cookingoiltechnology.Theusedofthisresearchwasgivingoutinformationontherecyclingprocessofusedcooking oil.Researchdesignused2x2factorialpatterninrandomizedgroupdesignwith6repetitions.Thefirstfactorisadsorbent type(J)thatconsistofactivatedcarbon(J1)andZeolit(J2).Thesecondfactoriscolumnheight(K)withvariationsof15 cm(k1)and20cm(k2).Chemicalanalysisparameterarefreefattyacid,watercontentandsaponificationvalue.Physical parametermeasurementwasdoneoncolorwithHunterLabsystemanalysisandviscosityusingviscometermethod. Chemicalanalysisresultofpreliminaryresearchonusedcookingoilshowedwatercontentof1,9%,freefattyacid 1,58%,saponificationvalue130,79mgKOH/goil,viscosity0,6dPasandcolorwithLvalueof-27,60,avalue1,04and bvalue1,54.Resultonmainresearchshowedthatadsorbenttypeonlygaveeffectonwatercontentwhereascolumn heightanditsinteractionwasnotgavesignificanteffectonwatercontent.Interactionbetweenadsorbenttype(J)and columnheight(K)gavesignificanteffecttofreefattyacid,saponificationvalue,viscosityandcolorforL,aandbvalue ofrecycledcookingoil. Keywords: Adsorbents, Column Height, Adsorption Process, Used Cooking Oi
