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Oyong fiber (OF) is widely available natural fiber, the material characteristics and porosity make it a suitable alternative for filtration media. Accordingly, to investigate the potential use of OF as filter material in the wastewater disinfection process, this study applied different silver nanoparticles coating onto OF and proposed a new filter structure at lower cost. The OF coated AgNPs and OF coated Ag-GO were successfully synthesized following the chemical reduction methods as reported in the literature. SEM image shown that silver nanoparticles were randomly distributed on the surface of OF. Both OF coated AgNPs and Ag-GO exhibited a good disinfection capability for Total Coliform removal from wastewater. The OF coated Ag-GO have better Total Coliform Log Removal Value (LRV) of 3.3 and still maintain stable disinfection ability even at high filtration rate.

Project-based learning has been used globally as one of the effective methods to evaluate student performance in achieving the learning outcome of the chemistry subject. It became one of the priorities in implementing the new policy, Merdeka Belajar-Kampus Merdeka (MB-KM) from The Ministry of Education, Culture, Research and Technology in Indonesia. The student at the university level can join a project-based learning program conducted outside the classroom and supervised by the Project supervisor. We proposed the project-based learning program to maximize the chemistry students’ role in solving the waste cooking oil in society. The purpose of this program was to introduce the chemistry student to the real problem in the society and allow the dissemination of their innovative idea. The information prevailed from observing the activity, interviewing the students, and evaluating the student's performance. This project-based learning presented that students accomplish the information and knowledge they gain from the classroom into actions to solve the real problem in society.  Keywords: project-based learning, Merdeka Belajar-Kampus Merdeka (MB-KM), waste cooking oil, chemistry students’ role