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All Journal Journal TEPAT: Teknologi Terapan untuk Pengabdian Masyarakat Eksergi: Jurnal Teknik Energi
Ririn Arsy Gunawan
Unknown Affiliation
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering Public Health

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Increasing the Added Value of Wood Powder Waste into Biobriquettes as Renewable Energy Fuel in Nagari Sungai Buluh, Padang Pariaman Regency Riski Gunawan Nasution; Raihan Aprila; Ririn Arsy Gunawan; Nurfajriana Husna Rahimi; Muhammad Rifan Ridha
JURNAL TEPAT : Teknologi Terapan untuk Pengabdian Masyarakat Vol 8 No 2 (2025): Collaboration for Accelerated Community Achievement
Publisher : Faculty of Engineering UNHAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/jurnal_tepat.v8i2.632

Abstract

This community service program aimed to address the problem of wood dust waste in Sungai Buluh Nagari, Padang Pariaman Regency, by converting it into biobriquettes as a renewable energy source. The wood dust waste generated by local woodcrafters has not been utilized optimally and is often burned directly, causing air pollution. Through a participatory approach, this program involved technical training, technology transfer, and hands-on mentoring in biobriquette production. Quantitative analysis through pre-test and post-test of 20 participants showed a significant increase in understanding, with the "highly understood" category surging from 4.2% to 55.0%. Implementation results showed that the community successfully produced functional biobriquettes with specifications of 2 cm diameter, 3 cm height, and a burning duration of 2-3 hours per unit. Community participation reached 93%, with product utilization by satay vendors and households reporting up to 40% savings in fuel costs. This program not only successfully enhanced the economic value of waste but also established independent production groups committed to continuing the biobriquette business sustainably. Support from the village government and community enthusiasm were key success factors, while also contributing to reduced environmental pollution and energy independence at the local level.
Synthesis of Oil Palm Mesocarp Lipase Biocatalyst Immobilized on Zeolite for Enzymatic Biodiesel Production from Waste Cooking Oil Ririn Arsy Gunawan; Nurfajrina Husna Rahimi; Addin Akbar; Rita Youfa; Muhammad Riski Gunawan Nasution
Eksergi Vol. 22 No. 03 (2026): SEPTEMBER 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i03.7775

Abstract

Waste cooking oil (WCO) is an abundant and inexpensive feedstock for biodiesel production, but conventional homogeneous acid or base catalysts are prone to saponification and are difficult to separate from the reaction product. Enzymatic catalysis using lipase provides a milder and more selective alternative. This study developed a lipase biocatalyst extracted from oil palm (Elaeis guineensis) mesocarp, purified by ammonium sulfate fractionation, and immobilized on activated natural zeolite, for the enzymatic esterification of free fatty acids derived from WCO. Crude lipase activity increased from 3.75 U/mL to 74.08 U/mL after stepwise (NH4)2SO4 precipitation at 60–75% saturation. WCO was first hydrolyzed to free fatty acids (FFA content 2.68% after hydrolysis) and then esterified with methanol at 40 °C for 8 h using free extract, zeolite-immobilized, and commercial lipase at catalyst loadings of 1.2, 1.8, and 2.4% (w/w). Immobilized enzymes produced higher average yields (91.89% for palm lipase and 91.66% for commercial lipase) than free enzymes (79.34% and 87.24%, respectively), and the resulting biodiesel density (0.887–0.898 g/cm3) satisfied SNI 7182:2015. However, viscosity (20.9–22.7 mm2/s) and the GC-MS-confirmed fatty acid methyl ester (FAME) content (9.39% for the free enzyme and 2.76% for the immobilized enzyme) remained far below the SNI requirement, indicating that esterification was incomplete and that further process optimization is required.
Co-Authors Addin Akbar Muhammad Rifan Ridha Muhammad Riski Gunawan Nasution Nurfajriana Husna Rahimi Nurfajrina Husna Rahimi Raihan Aprila Riski Gunawan Nasution Rita Youfa