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Mayasari, Rizka
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Co-Pyrolysis of Jatropha Curcas Seeds and HDPE Plastic for Bio-Oil Production Tiara, Tiara; Dzakwan, Akhmad; Mayasari, Rizka; Ulya, Muhamad Ridho; Haviz, Muhammad; Utari, Ririn
Jurnal Bio-Geo Material Dan Energi Vol. 6 No. 3 (2026): Journal of Bio-Geo Material and Energy (BiGME), June 2026
Publisher : PUI BiGME Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/j-bigme.v6i3.56510

Abstract

The limited availability of fossil fuels and the growing volume of plastic waste underscore the need to develop environmentally friendly alternative energy sources. This study aims to produce high-energy-value bio-oil through a co-pyrolysis process involving Jatropha curcas seed biomass and high-density polyethylene (HDPE) plastic. The research involved the following stages: characterization of Jatrofa curcas seed, raw material preparation, pyrolysis, and analysis of  bio-oil. The temperature variations used were 350°C, 450°C, and 550°C with raw material ratios of 75:25, 50:50, and 25:75.  The results of the study indicate that increases in temperature and the proportion of HDPE significantly affect the increase in heat value and the decrease in moisture content of the bio-oil. The highest calorific value was obtained at a 25:75 ratio and a temperature of 450°C, amounting to 42.50 MJ/kg, while the lowest moisture content was 2.9% under the same conditions. This indicates a synergistic effect between the biomass and the plastic, in which HDPE acts as a hydrogen donor that reduces the oxygen content in the bio-oil, thereby improving the fuel quality. In conclusion, the co-pyrolysis method using Jatropha curcas seed and HDPE can produce bio-oil with better energy characteristics and low moisture content. This research not only contributes to the development of renewable energy but also offers innovative solutions for the sustainable management of plastic waste.
Production of biogas from coffee husk waste with rumen fluid and mixture of rumen fluid and cow dung Hasrul Anwar; Ridho Ulya; Miftahul Djana; Rizka Mayasari
Konversi Vol 12, No 1 (2023): April 2023
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v12i1.15810

Abstract

Coffee is the second largest traded commodity in the world and also produces by-products and residues. Coffee husk waste is an abundant lignocellulosic material and has the potential to be used as raw material for biogas production. This study compared the production of biogas from coffee husk using rumen fluid with a mixture of rumen fluid and cow dung. In the pretreatment process using ethanol, the waste consisted of 65.90% cellulose, 24.95% hemicellulose, 0.21% lignin, 2.16% pectin, 1.08% protein, 3.11% tannins, 0.91% caffeine, and 3.78% polyphenols. The decrease in TS (total solid) and VS (volatile solid) values for C-RC (coffee-rumen fluid-cow dung) was greater than for C-R (coffee-rumen fluid) as 32.20% and 42.47% were obtained for C-RC, while the values for C-R were 19.32% and 38.37 The VFA (volatile fatty acids) values for C-R and C-RC were 1.09% and 2.24%. The biogas produced for C-R was CH4 of 14.4%, CO2 of 13.75%, and H2 of 0.59%, while that for C-RC consisted of CH4 of 22.3%, CO2 of 4.11%, and H2 of 0.36%. The yield of biogas for C-R was 0.48 Nm3/(kg COD removal) and for C-RC was 1.95 Nm3 /(kg COD removal).
Co-Authors A.Yudi Eka Risano Akhmad Dzahwan Akhmad Dzakwan Anwar, Hasrul Ashruri Djana, Miftahul Djanna, Miftahul Dwi Budi Santoso Eka Apriyani Eko Rahmadi Kurniawati Oktarina M. Haviz M. Ridho Ulya Masayu Rosyidah Masruri, Ahmad Ansyori Masruri, Ahmad Ansyori Merisha Hastarina Muhammad Haviz Nandi Haerudin Noorhidana, Vera A Novianti, Tika Christy Ofik Taufik Purwadi Putra, Ramadani Diana Rosalia D. Werena Rosalia D.W Rosalia Dwi Werena Sari, Devi Kurnia Siti Nurul Khotimah Sugiarto, Bagas Gangsar Sumanjaya, Erlan - Syah, Aminudin Tiara Tiara, Tiara Ulya, Muhamad Ridho Utari, Ririn Wijaya, Riki C Yasmin Yusuf, Ananda Emelia