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All Journal International Journal of Renewable Energy Development Jurnal Ilmu Lingkungan Jurnal Keteknikan Pertanian Sinergi Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) agriTECH Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Dinasti International Journal of Education Management and Social Science ASEAN Journal of Chemical Engineering Jurnal Pusat Inovasi Masyarakat International Journal of Innovation in Mechanical Engineering and Advanced Materials International Journal of Renewable Energy Development International Journal of Oil Palm
Edy Hartulistiyoso
Department Of Mechanical And Biosystem Engineering, Faculty Of Agricultural Technology, IPB University, Bogor, Indonesia.
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Studi Teoritis Karakteristik Termal Pembakaran Biomassa Tanaman Energi pada Berbagai Kondisi Udara dalam Tungku Adiabatik Haris Mawardi; Edy Hartulistiyoso; Muhamad Yulianto
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 12 No 2 (2024): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v12i2.659

Abstract

Combustion is an energy conversion method involving the reaction of fuel and oxygen to generate heat. Coal remains predominant in Indonesia’s energy mix, contributing to over 50% of global CO2 emissions. Efforts to reduce these emissions include using renewable energy sources like biomass, with current potential in energy crop biomass such as gamal and sengon wood. However, the thermal characteristics of burning gamal and sengon wood have not been extensively studied. This paper discusses the theoretical thermal characteristics of gamal and sengon wood combustion through numerical simulation using a combustion equilibrium model in an adiabatic furnace under stoichiometric, excess air, and excess fuel conditions. Thermodynamic calculations will be validated against experimental data. The simulation results show that the thermal characteristics of gamal combustion are superior to those of sengon. Adjustments in air supply can impact combustion quality, where excess air is often necessary to mitigate environmental factors disrupting theoretical stoichiometric combustion. Optimal combustion conditions are achieved at equivalence ratios of 1.3 for gamal and sengon. Validation using Mean Absolute Percentage Error (MAPE) indicates low error values (8,55%) affirming the model’s ability to predict thermal characteristics accurately.
Demineralization of Silica-Rich Agar Processing Residues via Hydrofluoric Acid Leaching for Organic Fraction Enrichment Andi Firdaus Sudarma; Edy Hartulistiyoso; Y. Aris Purwanto; Leopold Oscar Nelwan; Obie Farobie; Hendri; Harri Junaedi; Edy Herianto Majlan
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol. 8 No. 2 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v8i2.38546

Abstract

Agar solid waste (ASW) is a silica-rich industrial residue generated during agar extraction that contains organic residue mixed with mineral filtration aids such as Celite (diatomaceous earth) and perlite. Its high ash content and low organic fraction limit its direct utilization as a biomass-derived fuel. This study investigated hydrofluoric acid (HF) leaching as a demineralization pretreatment to reduce silica-rich minerals and improve the physicochemical quality of ASW. Two ASW samples obtained from different agar-processing plants, namely ASW-Celite (contain Celite) and ASW-Perlite (contain perlite), were treated using 10 wt% HF at a solid-to-liquid ratio of approximately 1:12. The treated samples were characterized using XRF, ICP-MS, FTIR, ultimate analysis, and proximate analysis. HF leaching caused substantial mass reduction, with solid yields of 24.99% for ASW-Celite-HF and 48.9% for ASW-Perlite-HF. Ash content decreased from 85.84 to 44.99 wt% in ASW-Celite and from 77.10 to 24.83 wt% in ASW-Perlite. XRF analysis confirmed significant silica removal, particularly in ASW-Celite, where SiO₂ decreased from 96.94 to 21.30%. ICP-MS further showed the reduction of several ash-forming and environmentally relevant elements, including Cr, Ni, Cu, Zn, Cd, P, S, Cl, Mn, and Fe. HF treatment also enriched the organic fraction, increasing carbon content from 4.69 to 12.52 wt% in ASW-Celite and from 9.83 to 16.10 wt% in ASW-Perlite. The HHV of ASW-Celite improved from 1.91 to 6.52 MJ/kg, whereas ASW-Perlite decreased from 4.80 to 3.19 MJ/kg due to its high oxygen content after treatment. These findings demonstrate that HF leaching effectively reduces silica-rich minerals in ASW, although further deoxygenation is required to improve its fuel quality for bioenergy applications.
Influence of inorganic content on hydrochar quality from high-ash agar extraction waste via hydrothermal carbonization Andi Firdaus Sudarma; Edy Hartulistiyoso; Yohanes Aris Purwanto; Leopold Oscar Nelwan; Obie Farobie; Nono Darsono; Khuzaimah Arifin; Maharani Dewi Solikhah; Tri Yulni; Imam Hidayat; Muhamad Fitri; Edy Herianto Majlan
SINERGI Vol. 30 No. 3 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.3.005

Abstract

Agar solid waste (ASW) has potential as a feedstock for hydrochar production because of its organic content; however, its high inorganic fraction, predominantly silica, limits its application. Furthermore, studies specifically investigating the hydrothermal carbonization (HTC) of ASW remain limited, given its high ash content and low energy value. This study investigated the HTC of ASW at varying temperatures (180–220 °C) and reaction times (30–90 minutes), with particular emphasis on how two inorganic components (celite versus perlite) affect hydrochar yield, composition, and energy properties. The resulting hydrochars were characterized using CHNSO, proximate, SEM, and FTIR analysis. The results revealed high ash contents reaching 77.7–92.08%, corresponding to HHV of 2.3–3.4 MJ kg⁻¹, while FTIR spectra confirmed strong silica presence through prominent Si–O–Si absorption bands. Therefore, the study provides valuable insights into silica-rich biomass behavior during HTC. The study also evaluated the relationship between HHV and ash content and analyzed the kinetic model. The results demonstrate the significant influence of inorganic components on carbonization pathways, highlighting opportunities to enhance hydrochar quality through pretreatment strategies such as acid/alkaline leaching or mineral separation.
Co-Authors . Harmen Addiena Syahvina Nasution Adicha Rahmawati Ali Parjito Anas Miftah Fauzi Anas Miftah Fauzy Andi Firdaus Sudarma Andi Muhammad Akram Mukhlis Aris Purwanto Armansyah H. Tambunan Armansyah Halomoan Tambunan Armansyah Halomoan Tambunan Cahyadi, Firdaus Chandra Gupta Dadan Kusdiana Dadan Kusdiana Damanik, Annisa Purnamasari Dedi Fardiaz Dziyad Dzulfansyah Edy Herianto Majlan Edy Herianto Majlan Eka Priyana Elpodesy Marlisa Erlanda Augupta Pane Fajri, Ihsanul Firdaus Cahyadi Hablinur Alkindi Haris Mawardi Harri Junaedi Hendri Hendri Syah Henry Munandar Manik I Dewa Made Subrata Ihsanul Fajri Imam Hidayat Inge Scorpi Tulliza Inge Scorpi Tulliza Irawan Senatosa Irham Faza Khuzaimah Arifin Lalu Muh Fathul Aziz Al Azhari Lamhot Parulian Manalu M Ridwan Dwi Astanto M. Arief Yahdi Maharani Dewi Solikhah Muhamad Fitri Muhamad Yulianto Muhamad Yulianto Nelwan, Leopold Oscar Nono Darsono Nur Pratiwi Rasyid Obie Farobie Rahayu Widyastuti RAHAYU WIDYASTUTI Rokhani Hasbullah Salundik . Setya Permana Sutisna Setyo Pertiwi Setyo Pertiwi Slamet Widodo Soeryo Adiwibowo Sri Endah Agustina Sri Mulyani Sucahyo, Lilis Suhengki, Suhengki Sumantri, Willi Supriyanto Supriyanto Sutoyo, Edi Teti Resmianty Teti Resmianty Tri Yulni Yahdi, M. Arief