Environmentally safe technology with the conversion of used cooking oil into soap

Cooking oil consumption in Indonesia is very high and tends to rise every year, reaching 500,000 tons/year. Waste of used cooking oil pollute water and reduces the biota. Therefore, the conversion of used cooking oil will help to reduce environmental damage. One of the conversions done is making the bulk cooking oil into soap. This study aims to determine the effect of NaOH concentration on the quality of soap made from purified used cooking oil. Activated charcoal from sugarcane bagasse was used in the conversion of soap to diminish odor and brown color. This study was designed using an experimental method with descriptive analysis. The treatment in this study was the difference in NaOH concentrations of 10%, 30%, and 50% with each concentration repeated three times. The results obtained showed that the most optimal NaOH concentration is 50% since it has a dense soap consistency. In contrast, the 30% NaOH concentration has a semi-solid soap consistency. At 10% NaOH concentration the consistency of soap is still liquid. It can be concluded that the concentration of NaOH affects the quality of the soap.