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Biodiesel, which is generally defined as monoalkyl esters from plant and animal fats, is an alternative fuel that has the potential to be used as a substitute for diesel fuel because of its characteristics. Used cooking oil or used cooking oil haD the potential to be processed into biodiesel and this study aims was to produce waste cooking oil into biodiesel from the results of the pre-treatment process of used cooking oil with bagasse waste, to find out the optimum result of the oil pretreatment proces and the raw material used was used cooking oil from the Rocket Chicken Food Court restaurant. Waste from sugarcane bagasse was useful as an adsorption process for the purification of used cooking oil which was able to reduce free fatty acid levels, water content, and impurities levels for the biodiesel process. The optimum particle size of bagasse waste for used cooking oil pretreatment was 30 mesh, with the analytical data was 1.93%  of free fatty acid, 0,0018 % for water content and 0,03% of firt level. The results of the Biodiesel analysis from the pre-treatment process were the viscosity was 5.7 Cst, the density was 860 kg/m3 and the acid number was 0.8 mg KOH/g oil. This result was accordance to the indonesian national standard No. 04-7182-2006.

Research has been carried out on the use of wood sawdust as an adsorbent for ikat weaving liquid waste. This research aims to determine the effect of using wood sawdust as an adsorbent on ikat weaving liquid waste. This research was carried out at the IKIP Muhammadiyah Maumere Laboratory and the Maumere Health Service Laboratory. The sample in this study was ikat woven liquid waste which was divided into four treatments, namely Control (K) and the other three were treatments (P1, P2, P3) with the addition of 1,2 and 3 grams of activated charcoal. The method in this research is an experimental method with the research design being True Experimental in the form of Posttest Only Control Group Design. The characteristic tests in this research include a water content test with a value of 0.0833%, and a yield test with a value of 1.9634%. The test parameters used include the degree of acidity (pH), Manganese (Mn) content test and organoleptic test. The research results showed that the pH value before contact with activated charcoal was 9.63 (alkaline pH), and after contact with activated charcoal at a dose of 3.0 grams the pH value became 8.01 (alkaline pH). In testing Mn levels before contact with activated charcoal, the value was 4.60 mg/l and after adding 1.0 grams, 2.0 grams and 3.0 grams of activated charcoal, there was a decrease in Manganese levels respectively, namely from 3 mg/l. , 2.78 mg/l and 1.83 mg/l. Furthermore, for the organoleptic test, there was a change in the color of the ikat woven liquid waste from initially black to clear yellow. Thus, it can be concluded that the addition of activated charcoal from sawdust can have an effect on ikat weaving liquid waste.

Amidst the Covid-19 pandemic, there has been a significant increase in the demand for oxygen. More people require oxygen cylinders, yet the supply is insufficient to meet the community's needs. Oxygen Concentrators have become an essential device capable of producing pure oxygen with a purity level reaching 95% through the application of Pressure Swing Adsorption (PSA) technology. The resulting ratio produced by the concentrator is 33.4% for synthetic zeolite, 30% for silica gel, 20% for natural zeolite, and 26.7% for activated carbon.

Minyak jelantah merupakan minyak yang dipakai secara berulang-ulang. Seringnya pemakaian minyak jelantah menyebabkan penurunan kualitas minyak seperti warna menjadi coklat dan timbulnya bau menyengat atau tengik yang berpotensi membahayakan kesehatan tubuh. Tujuan dari penelitian ini adalah mengidentifikasi potensi penambahan adsorben tempurung kelapa (Cocos nucifera) terhadap regenerasi minyak jelantah. Hasil penelitian ini didapatkan bahwa adsorben tempurung kelapa setelah dilakukan pengarangan dan aktivasi dapat meregenerasi minyak jelantah yang ditinjau dari berubahnya warna pada minyak jelantah yaitu menjadi lebih cerah atau kuning dan penurunan kadar asam lemak bebas atau FFA menurun hingga 75,73% dari kadar FFA minyak jelantah awal 1,03% menjadi 0,25%.