The Performance of Coal-Based Activated Carbon on Sulfur Adsorption in Waste Engine Oil

East Kalimantan is one of the provinces in Indonesia that produces the largest coal. Lignite coal has less economic value because it has a low calorific value. In addition, the use of engine oil increases often increasing the number of motor vehicles, engine oil that has been used has the potential to pollute the environment, especially because of the presence of sulfur content. Therefore, efforts are needed to reduce the sulfur content contained in the used oil, one of the alternatives is by adsorption techniques. In the adsorption process, an adsorbent is needed as an absorbent medium, so by utilizing low-rank coal into activated carbon which will act as an adsorbent, it will be able to increase the economic value of lowrank coal. The adsorption process is carried out by varying the activated carbon derived from low-rank coal, which is (5-25) % by weight to used oil which is carried out at room temperature within 30 minutes. The purpose of this study is to evaluate the adsorption capacity of low-rank coal in reducing sulfur and metal content contained in waste engine oil. The best results obtained in the adsorption process are at a carbon dose of about 10% for engine oil waste with an activated carbon absorption capacity of 14.8%, but the best percentage of removal conditions is obtained at a 15% activated carbon dose, in which the percentage of sulfur removal in engine oil waste reaches (38 - 50) %