Penurunan Kadara FFA Minyak JelantahMenggunakan Adsorben Arang Aktif Dari Limbah Kulit Biji Kopi Robusta (Coffea canephora L) (Metode Optimasi Response Surface Methodology)

Ongan, Aprilia Anre (2026) Penurunan Kadara FFA Minyak JelantahMenggunakan Adsorben Arang Aktif Dari Limbah Kulit Biji Kopi Robusta (Coffea canephora L) (Metode Optimasi Response Surface Methodology). Undergraduate thesis, Politeknik Negeri Jember.

	Text (Abstract) Abstract.pdf - Submitted Version Available under License Creative Commons Attribution Share Alike. Download (12kB)
	Text (Bab 1 Pendahuluan) Bab 1 Pendahuluan.pdf - Submitted Version Available under License Creative Commons Attribution Share Alike. Download (158kB)
	Text (Daftar Pustaka) Daftar Pustaka.pdf - Submitted Version Available under License Creative Commons Attribution Share Alike. Download (288kB)
	Text (Laporan Lengkap) Laporan Lengkap.pdf - Submitted Version Restricted to Registered users only Download (4MB) | Request a copy

Abstract

Waste cooking oil contains a high level of free fatty acids (FFA), which must be reduced before it can be utilized as a feedstock for biodiesel production. This study aimed to analyze the effects of adsorbent concentration, adsorption time, and particle size of activated carbon derived from robusta coffee husk (*Coffea canephora* L.) on the reduction of FFA content in waste cooking oil, as well as to determine the optimum operating conditions using the Response Surface Methodology (RSM) with a Box-Behnken Design (BBD). The independent variables consisted of adsorbent concentrations of 2%, 4%, and 6%; adsorption times of 150, 175, and 200 minutes; and adsorbent particle sizes of 40, 60, and 80 mesh. The results showed that the highest FFA reduction of 63.86% was achieved at an adsorbent concentration of 6%, an adsorption time of 175 minutes, and a particle size of 40 mesh, reducing the FFA content from 2.2% to 0.8%. In contrast, the lowest FFA reduction of 43.17% was obtained at an adsorbent concentration of 4%, an adsorption time of 200 minutes, and a particle size of 80 mesh. RSM optimization indicated the optimum conditions at an adsorbent concentration of 5.55%, an adsorption time of 177.02 minutes, and a particle size of 40 mesh, with a predicted FFA reduction of 63.34% and a desirability value of 0.975. The adsorption process using activated carbon produced from robusta coffee husk resulted in treated waste cooking oil with a final FFA content of 0.8%, an acid value of 1.582 mg KOH/g, and a density of 0.896 g/cm³. These findings demonstrate that activated carbon derived from robusta coffee husk has strong potential as an effective adsorbent for reducing the FFA content of waste cooking oil.

Actions (login required)

View Item