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Dede Hermawan
Departemen Hasil Hutan, Fakultas Kehutanan Dan Lingkungan, Institut Pertanian Bogor
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Social Sciences Other

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Synergistic Effects of Calliandra and Biomass Additives on the Fuel Quality of Biopellets for Sustainable Energy Mustaghfirin, Mustaghfirin; Hermawan, Dede; Sarip Nawawi, Deded; Surya Kusumah, Sukma; Ferdiansyah, Muhammad; Raditya Bagus Surya Kelana, I Putu; Saputra Pardede, Alvian; Rizqi Abdul Aziz, Salman; Oki Putri Damanik, Cimmi
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.21193

Abstract

The growing demand for renewable energy has driven the utilization of biomass as an environmentally friendly alternative energy source. This study aims to develop high-quality biopellets based on Calliandra calothyrsus wood by incorporating Eichhornia crassipes (water hyacinth) and Melaleuca cajuputi (cajuput leaf waste) to enhance combustion efficiency and reduce ash content. Five biomass formulations were evaluated: pure calliandra, pure water hyacinth, pure cajuput leaves, calliandra–water hyacinth (75:25), and calliandra–cajuput leaves (75:25). The produced biopellets were analyzed for their physical characteristics, calorific value, and proximate properties, including moisture content, volatile matter, ash content, and fixed carbon. Results showed that the calliandra–cajuput mixture yielded the best performance, with a density of 0.84 g/cm³, low ash content (2.65%), and a high calorific value (18.2 MJ/kg). The addition of water hyacinth reduced volatile matter but increased ash content. The biopellets from the calliandra–cajuput blend met the SNI 8675:2018 standard for both household and industrial use. This study demonstrates that the integration of locally available biomass waste can significantly improve biopellet quality while supporting sustainable waste management and renewable energy diversification.
Optimizing Nitric Acid Leaching Conditions for Ash and Potassium Reduction in Empty Fruit Bunches-Based Biomass Energy Santosa, Dwi Jaksana Megah; Hermawan, Dede; Surya Kusumah, Sukma; Nawawi, Deded Sarip; Sutiawan, Jajang
Journal of Sylva Indonesiana Vol. 9 No. 01 (2026): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jsi.v9i01.23044

Abstract

Oil palm empty fruit bunches (EFB) represent an abundant biomass waste in Indonesia with high potential as a solid biofuel. However, the high ash content and the presence of alkali metals such as potassium in EFB contribute to low combustion efficiency and increase the risks of fouling and slagging. This study aims to reduce the ash and potassium content in EFB-based biomass fuel through demineralization using nitric acid (HNO₃). Acid demineralization was conducted using various acid concentrations (1%, 3%, and 5%) and soaking durations (10, 30, and 60 minutes). The parameters analyzed include ash content, calorific value, potassium content, as well as proximate and ultimate analysis. The results indicate that demineralization using 1% nitric acid for 10 minutes is the optimum condition, successfully reducing the ash content from 7.93% to 3,43% and reduced potassium by 77% (0,087%- 0,02%). In addition, the fix carbon increased (16,11%-18,09%), sulfur decreased (0,115%-0,086%), and the calorific value increased to 4355,83 cal/g. This treatment also increased the carbon and hydrogen content while reducing sulfur content, thereby improving thermal quality and reducing emissions. Acid demineralization using low-concentration nitric acid is effective in reducing ash and potassium content, thereby enhancing the performance of EFB-based biopellets as a biomass energy source.
Implementasi Metode Eksperimen dalam Pembelajaran IPA Tentang Sumber Energi Alternatif pada Siswa Kelas IV MI Attaqwa Sawangan Depok Chaira Saidah; Ernawati; Dede Hermawan; Asep Sujana; Umiyati
Reslaj: Religion Education Social Laa Roiba Journal Vol. 7 No. 2 (2025): RESLAJ: Religion Education Social Laa Roiba Journal
Publisher : Intitut Agama Islam Nasional Laa Roiba Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47467/reslaj.v7i2.4979

Abstract

This research aims to increase interest in science lessons, especially material about alternative energy sources among class IV students at MI At Taqwa Sawangan Depok in the even semester of the 2023/2024 academic year. The data collection method uses the library research method. The data collection technique used is by listing all the variables that need to be studied, namely: learning implementation, experimental methods, alternative energy source materials. Select the necessary descriptive materials from available sources such as books, articles or biographies that are relevant to the problem being studied. This research can be concluded that the application of experimental methods in science learning can increase students' interest in learning and students' science learning outcomes, especially material on alternative energy sources.  
Co-Authors Abdillah, Imam Busyra Adi Santoso ADI SANTOSO Agus Yuniawan Isyanto Ahmad Jamaludin Ahmad Syahrir Aisyah, Syifa Akhiruddin Maddu Alessandro Geovani Damanik Alfarisi, Muhammad Tsalman Algifari, M. Alimuddin Alimuddin Andi SRD Lestari Anita Firmanti Apri H Iswanto Apri Heri Iswanto Apri Iswanto Apri Iswanto, Apri Arif Fajar Prasetiyo Asep Sujana Astari, Lilik Bagus MARTIANTO Bambang Subiyanto Bernadeta Ayu Widyaningrum Bernadeta Ayu Widyaningrum Budi Setia Chaira Saidah Deded Sarip Nawawi Deni Purnomo Deni Purnomo Deni Purnomo Deni Zulfiana Dimas Triwibowo Elfrida Ratnawati Endang Sukara Ernawati Fathur Rohman, Muhammad Iqbal Fauzi Febrianto Fauzi, Habal Fauziah, Rizkia Fazhar Akbar Firda A Syamani Firda A. Syamani Firda Aulya Syamani Fisimar, Farhan Al Gempar Al-Hadist Gustan Pari Gustan Pari Gustan Pari Gustan Pari Hakim, Mizanul Happy Yulia Heni Pujiastuti Hidayat, Danih Jian Ikhsan Guswenrivo Iman Hidayat Ismadi Ismadi Ismadi Ismail Budiman Ismail Budiman Ismail Budiman Ismail Budiman Ismayati, Maya Jajang Suryana Jajang Sutiawan Jajang Sutiawan Jajang Sutiawan Jajang Sutiawan Jr, Muhammad Zairin Kenji Umemura Khairun Hidayat Khairun Hidayat Khoirunnissa, Khoirunnissa Kurnia Wiji Prasetiyo Kurnia Wiji Prasetyo Kusumah, Sukma Surya Lina Karlinasari Lisman Suryanegara M. Farouq Iksan Madani, M Fikri Haikal Mangurai, Silvia Uthari Nuzaverra Mayang Maolana, Ikhsan Merici, Elfriyani Angela Muh Yusram Massijaya, Muh Yusram Muhammad F Ikhsan Muhammad Ferdiansyah, Muhammad Muhammad Sadir Muhammad Sadir Muhammad Y Massijaya Muhammad Zairin Jr Munadian, Munadian Murni Handayani Mustagfirin Mustagfirin Mustaghfirin Mustaghfirin Mustamu, Sofia Naresworo Nugroho Narto Nijar, Afnan Farhan Ningrum, Riska Surya Nofrisman Jaya Putra Zendrato Nurhaida, . Odang Carman Oki Putri Damanik, Cimmi Pari, Rohmah Prama Hartami Raden Djuniarsono Raditya Bagus Surya Kelana, I Putu Rahman Rahman Ramadani, Arfah Ramadhan, Dikri Ramadhan, Risan Rani Andriani, Rani Riska Surya Ningrum Rizqi Abdul Aziz, Salman Robi’atul Utami Aini Rohny Setiawan Maail Rosa, Tina Safitri, Pradita Wuri Sagita, Praniko Imam Salim Hiziroglu Santosa, Dwi Jaksana Megah Saputra Pardede, Alvian Sarip Nawawi, Deded Sasa Sofyan Munawar Sasa Sofyan Munawar Siti Nursaadah, Siti Sopyan, Alif Wahyu Stafian Nisa, Rihab Subyakto Subyakto Subyakto Subyakto Subyakto Subyakto Subyakto Subyakto Subyakto Suci Mardhatillah Suci Mardhatillah Sudarmanto Sujati, Ananda Sukirno Sukirno Sukma S Kusumah Sukma S. Kusumah Sukma Surya Kusumah Sukma Surya Kusumah Sukma Surya Kusumah Sukma Surya Kusumah suratmi, tri Surdiding Ruhendi Surdiding RUHENDI Surdiding Ruhendi Surya Kusumah, Sukma Sutiawan, Jajang Syamani, Firda Aulya Syamsiar, Syamsiar Triguna, M Ivan Umiyati Wida Banar Kusumaningrum Widyaningrum, Bernadeta Ayu Wikantyoso, Bramantyo Yunia Frida Adelka Yusuf Hadi Yusuf Hadi, Yusuf Yusuf Sudo Hadi Yusufa, Joni