ANALYSIS OF BIOPELLETS FROM A MIXTURE OF COFFEE GROUNDS AND SAWDUST AS AN ALTERNATIVE ENERGY SOURCE

Muhamad Farad Sutarya, . (2025) ANALYSIS OF BIOPELLETS FROM A MIXTURE OF COFFEE GROUNDS AND SAWDUST AS AN ALTERNATIVE ENERGY SOURCE. Academia Open, 10 (2). pp. 6-13. ISSN 2714-7444

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Abstract

Background: Indonesia’s growing energy demand and dependence on fossil fuels necessitate renewable alternatives such as biomass-based biopellets. Specific Background: Coffee grounds and sawdust are abundant organic wastes with complementary thermal and mechanical properties suitable for pelletization. Knowledge Gap: However, limited studies have clarified how varying proportions of these materials influence biopellet quality relative to SNI 8021:2020 standards. Aims: This study evaluates the effects of four ratios of coffee grounds–sawdust mixtures (80:20, 70:30, 60:40, 50:50) on physical and proximate characteristics of biopellets. Results: One-way ANOVA and Tukey HSD (p < 0.05) showed significant differences across all parameters. Formulations A and B produced the highest calorific values (4674–4689 cal/g) meeting SNI requirements, while B achieved the highest density (560.34 kg/m³). Moisture and ash contents also met standards; however, density and fixed carbon fell below SNI thresholds due to the absence of torrefaction. Novelty: This study demonstrates that optimizing coffee grounds–sawdust mixtures alone cannot meet all quality indicators without thermal pretreatment. Implications: Incorporating torrefaction and enhanced pressing conditions is essential to improve energy density and combustion stability, supporting the development of high-quality waste-based biofuel in Indonesia.

Item Type:	Article
Additional Information:	[No.Panggil: 2110311060] [Pembimbing: Damora Rhakasywi] [Penguji 1: James Julian] [Penguji 2: Fitri Wahyuni]
Uncontrolled Keywords:	Biopellet, Coffee Grounds, Sawdust, Biomass Energy, Torrefaction
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Fakultas Teknik > Program Studi Teknik Mesin (S1)
Depositing User:	MUHAMAD FARAD SUTARYA
Date Deposited:	23 Feb 2026 01:51
Last Modified:	23 Feb 2026 01:51
URI:	http://repository.upnvj.ac.id/id/eprint/41807

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