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All Journal HAYATI Journal of Biosciences Lensa: Kajian Kebahasaan, Kesusastraan, dan Budaya MEDIA ELEKTRIKA Traksi : Majalah Ilmiah Teknik Mesin Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan METANA Jurnal Ilmu Lingkungan Pedagogi: Jurnal Ilmu Pendidikan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI LITE: Jurnal Bahasa, Sastra, dan Budaya Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Kesehatan Masyarakat Jurnal Pendidikan IPA Indonesia Jurnal Bahan Alam Terbarukan Waste Technology Agrointek Jurnal technoscientia Eksergi: Chemical Engineering Journal Seminar Nasional Teknik Kimia Kejuangan Journal of Engineering and Technological Sciences FLYWHEEL : Jurnal Teknik Mesin Untirta Majalah Ilmiah MOMENTUM Science and Technology Indonesia Briliant: Jurnal Riset dan Konseptual Emerging Science Journal Jurnal Aplikasi Teknologi Pangan Communications in Science and Technology Indonesia Journal of Halal Culturalistics: Journal of Cultural, Literary, and Linguistic Studies Astonjadro Food Science and Technology Journal (Foodscitech) Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi ASEAN Journal of Chemical Engineering Indonesian Journal of Electrical Engineering and Computer Science G-Tech : Jurnal Teknologi Terapan JURNAL ILMIAH AGRINECA Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi JURNAL TEKNOLOGI TECHNOSCIENTIA Jurnal Litbang Kota Pekalongan Prosiding SNAST Devotion: Journal of Research and Community Service Jurnal Energi Baru dan Terbarukan Journal of Renewable Energy, Electrical, and Computer Engineering Journal of Bioresources and Environmental Sciences METAL : Jurnal Sistem Mekanik dan Termal Formosa Journal of Science and Technology (FJST) Makara Journal of Technology Jurnal Profesi Insinyur Indonesia Journal of Bioresources and Environmental Sciences International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Sains Materi Indonesia
H Hadiyanto
Center Of Biomass And Renewable Energy (C-BIORE), Department Of Chemical Engineering, Diponegoro University, Jl Prof. H. Soedarto, SH, Tembalang, Semarang 50275 Department Of Chemical Engineering, Diponegoro University, Jl Prof. H. Soedarto, SH, Temb
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Batch and Fed-Batch Fermentation System on Ethanol Production from Whey using Kluyveromyces marxianus H Hadiyanto; D. Ariyanti; A.P. Aini; D.S. Pinundi
International Journal of Renewable Energy Development Vol 2, No 3 (2013): October 2013
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2.3.127-131

Abstract

Nowadays reserve of fossil fuel has gradually depleted. This condition forces many researchers to  find energy alternatives which is renewable and sustainable in the future. Ethanol derived from cheese industrial waste (whey) using fermentation process can be a new perspective in order to secure both energy and environment. The aim of this study was  to compare the operation modes (batch and fed-batch) of fermentation system on ethanol production from whey using Kluyveromyces marxianus. The result showed that the fermentation process for ethanol production by fed-batch system was higher at some point of parameters compared with batch system. Growth rate and ethanol yield (YP/S) of fed-batch fermentation were 0.122/h and 0.21 gP/gS respectively; growth rate and ethanol yield (YP/S) of batch fermentation were 0.107/h, and 0.12 g ethanol/g substrate, respectively. Based on the data of biomass and ethanol concentrations, the fermentation process for ethanol production by fed-batch system were higher at some point of parameters compared to batch system. Periodic substrate addition performed on fed-batch system leads the yeast growth in low substrate concentrations and consequently  increasing their activity and ethanol productivity. 
Methyl ester production from high free fatty acid content with Ce/Zeolite bifunctional catalyst Aisyah Sabrina Nurul Syahidah; Dinanti Putrisia Wilujeng; W. Widayat; H. Hadiyanto; S. Sulardjaka; Noorzita Ngadi
International Journal of Renewable Energy Development Vol 15, No 3 (2026): May 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61945

Abstract

The production of methyl esters from high free fatty acid (FFA) feedstock remains a critical challenge in biodiesel processing, particularly when using Palm Acid Oil–waste cooking oil (PAO–WCO) with an initial FFA content of 53.21%. Such high FFA content significantly reduces reaction efficiency and necessitates a conventional two-step process involving esterification to lower the FFA level followed by transesterification to convert triglycerides into methyl esters. This multistep approach limits process efficiency and increases operational complexity for high-FFA feedstock. This study investigates the use of a bifunctional Ce/Zeolite catalyst to enable simultaneous esterification and transesterification in a single-step process for high FFA content oil. The zeolite support was synthesized from geothermal waste, and cerium was incorporated via impregnation. The catalyst was characterized using SEM–EDX, X-ray diffraction (XRD), and Brunauer–Emmett–Teller (BET) surface area analyses. The reaction was conducted under various operating conditions, including different temperatures and catalyst loadings. The Ce/Zeolite catalyst exhibited effective bifunctional activity, enhancing the simultaneous conversion of FFAs and triglycerides in high FFA content feedstock. The optimum conditions were a methanol-to-oil molar ratio of 12:1, 4 wt% catalyst loading, and a reaction temperature of 50 °C for 180 min. Under these conditions, FAME concentration of 91.5% was obtained, with FFA conversion of 25.31% (reduction of 13.47% FFAs from initial 53.21%) achieved in a single-step transesterification process. These results demonstrate that Ce/Zeolite is a promising bifunctional catalyst for the efficient processing of high FFA content oil, offering a simplified and more sustainable pathway for industrial biodiesel production.
Performance Analysis and Techno-Economic Evaluation of Solar Energy Retrofitting for Coal-Fired Power Plant in Central Kalimantan Province Irfan Ali; Hadiyanto Hadiyanto; Asep Yoyo Wardaya
Journal of Renewable Energy, Electrical, and Computer Engineering Vol. 4 No. 2 (2024): September 2024
Publisher : Institute for Research and Community Service (LPPM), Universitas Malikussaleh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jreece.v4i2.16658

Abstract

The power generation sector contributes to climate change. Mitigation efforts are essential to ensure that the commitment to limiting the global temperature increase below 2°C stays on course. One option is to retrofit an existing power plant with new technology that allows integration with renewable energy. This study examines the incorporation of solar energy systems into the operational processes of coal-fired power plants. Utilizing solar energy to substitute steam extraction from high-pressure feed water heater No. 7. This study analyzes the performance of the power plant before and after the retrofit scenario within both power-boost (PB) and fuel-save (FS) modes. Performances under different load conditions also investigated. The results reveal that the thermal efficiency within both FS and power-boost (PB) modes increased up to 2 % compared to the base scenario. In both power-boost and fuel-save (FS) modes, there is a notable reduction in specific fuel consumption, with power-boost mode experiencing a decrease of 15.05 g/kWh and fuel-save mode showing a decrease of 15.75 g/kWh. Thus, the decreasing coal consumption implies reduced CO2 emissions within both FS and power-boost (PB) modes by 4.69 % and 4,94 %, respectively. Results under different loads show that the solar percentage and the rise in solar-to-electricity efficiency with decreasing loads. When operated in fuel-save (FS) mode, the proportions of solar electricity at VWO, 100%, 75%, and 50% load rates are 5.23 %, 5.53 %, 7.76%, and 11.92%, respectively. Moreover, the LCOE for solar electricity for both modes is 0.0267 USD/kWh, with expected investment returns of 5.87 years.
A hierarchical scholar expertise information system based on publication profiles and research records: a case in Universitas Diponegoro Eko Didik Widianto; Hadiyanto Hadiyanto; Teddy Mantoro; Raka Sindu Wardoyo; Muhamad Irham Maulana
Indonesian Journal of Electrical Engineering and Computer Science Vol 43, No 1: July 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v43.i1.pp250-258

Abstract

One factor that boosts the reputation of higher education institutions (HEIs) in gaining competitive advantage is the research productivity of their scholars, including at Diponegoro University (Undip). However, existing studies focus on metrics and their measurement but lack discussion of systems for leveraging these metrics to promote these scholars’ expertise. This study proposes a scholars’ expertise information system at Undip based on their publications and research track records to bridge information between the campus and outside parties, namely industry, government, and society. It provides expertise searching and browsing facilities in Dewey’s hierarchy of subjects and the institutional structure hierarchy. Scholar publications and research data are retrieved using the science and technology index application program interface (SINTA API). The collected data included lecturer profiles, study programs, SINTA subjects, articles, research, community service, intellectual property rights (IPR), and books. It has been fully deployed and adopted online, presenting the expertise of Undip scholars based on their publications and research records. The finding shows that all pages perform well, with an average GTmetrix B grade and a performance score of 91%, a structure score of 88%, and a 1.8s loading time. With all the functionalities and performances of the system, this study contributes to developing an information system model to promote the expertise of university scholars, primarily based on their publications and research.
The Role of Algae in Biofuel Production: Potentials and Challenges for Sustainable Transportation Dessy Agustina Sari; Moh. Djaeni; Hadiyanto Hadiyanto; Aji Prasetyaningrum
TEKNIK Vol 46, No 1 (2025)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i1.67532

Abstract

This study aims to explore the potential of algae for sustainable biofuel production by examining their molecular biology and the use of advanced cultivation techniques. As concerns over greenhouse gas emissions and rising transportation energy costs grow, algae offer a promising alternative for fuel derived from both food and non-food sources. This review looks at the main biological pathways involved in making biofuels from algae. It focuses on species diversity, lipid content, and new technologies like photobioreactors and magnetic nanoparticle harvesting. The results showcase noteworthy advancements in biotechnology and genetic engineering that boost algae productivity and fuel yield, while also critically examining the environmental impacts such as CO2 emissions and water use, as well as the economic and policy challenges through a life cycle analysis. Adopting a global perspective, this review emphasizes the role of international collaboration and technology transfer in overcoming barriers. Conclusion: Algae-based biofuels hold considerable potential for reducing CO2 and supporting sustainable transportation, yet scaling up production and lowering costs remain challenges. Future research should focus on improving integrated biorefinery platforms, exploring CO2 capture, and promoting international partnerships.
Co-Authors - Hermawan - Purwanto . Widayat A Abdullah A.P. Aini A.P. Aini Aaron Nathanael Liemin Abdurrafi Alwan Achmad Chalid Afif Alfajrin Achmad Roesyadi Achmad Roesyadi Adhi, M. A. Adi Wibowo Adian Khoironi Afriza Ni'matus Sa'adah Afshar, Mohammad Ali Agus Suhatman Agus Suprihanto Ahmadi, Mohammad Hossein Aini, Apsari Puspita Ainun Nurusy Syahida Aisyah Sabrina Nurul Syahidah Aji Prasetyaningrum Al-Baari, Ahmad N Al-Baarri, Ahmad Ni’matullah Albertus Djoko Lesmono Alhuyi Nazari, Mohammad Alkian, Ilham Amalia Farhati Anak Agung Istri Sri Wiadnyani Andono Kusuma Jati Andri C. K. Andri Cahyo Kumoro Andri Cahyo Kumoro Andry Anggoro Arahim Angela Nitia Nefasa Angela Nitia Nefasa Anh Tuan Hoang Aniek Sri Handayani Aniek Sri Handayani Anisa Widia Utami Annisa Sila Puspita Apsari Puspita A. Apsari Puspita Aini Arief Budiman Arief Budiman Arief Budiman Arief Budiman Arif Harimukti Arifati Munfarida Asep Yoyo Wardaya Asri Cahaya Hati Athanasia Amanda Septevani, Athanasia Amanda Avido Yuliestyan Avido Yuliestyan Awaluddin Hidayat Ramli Inaku Azafilmi Hakiim Aziz Jihadian Barid B. Budhijanto Bambang Cahyono Bambang Yulianto Bayu, Handoko Bidi, Mokhtar Budhijanto, B. Cahyadi Cahyadi Cahyadi Cahyadi Cantika Aulia Salsabila Chandra Puspita Sari D A Sari D. Ariyanti D. Ariyanti D.S. Pinundi D.S. Pinundi Danny Soetrisnanto Dedi Khairunas Desiyantri Siti P. Dessy Agustina Sari Dessy Agustina Sari Dessy Ariyanti Dessy Ariyanti Dewi Selvia Fardhyanti Didi Dwi Anggoro Dinanti Putrisia Wilujeng Dionisius Dicky Davidoff Dyah Ari Wulandari Dyah Hesti Wardhani Dyan Pratiwi E Hugeng Wandono Ebrahimi, Morteza Eko Didik Widianto Eko Hidayanto Eko Wahjono, Tri Endang Kusdiyantini Eudia Christina Wulandari Evita Febriyanti Faradies Arija Febio Dalanta Ferdinandus Baskoro Hari Sapto Waluyo Fianda Revina Widyastuti Figa Muhammad Octafalahanda Fitria Yuli Anggita Sari Fitria Yuli Anggita Sari Fitriyanto, Bobby Rachmat Fitriyanto, Bobby Rachmat Franz, Nicholas Fuad Muhammad Fuad Muhammad Fuad Muhammad Ganang Dwi Hartanto Ganang Dwi Hartanto Ghasempour, Roghayeh Hakim, Muhammad Fahmi Hamdani Abdulgani, Hamdani Hamid Hamid Haniif Prasetiawan Hantoro Satriadi Hapsoro Bagus Wicaksono Hargono Hargono Haris Nu'man Aulia Hashfi Hawali Abdul Matin Hati, Asri Cahaya Hemawan, Ferry Hendra Naldi Henna Rya Abdurachim Henna Rya Sunoko Henna Rya Sunoko Heri Cahyono Heri Sutanto Hermawan Hermawan Hermawan Hermawan Hoang, Anh Tuan I Made Aditya Suryajaya I Made Aditya Suryajaya Iis Nurhasanah Imam Novrizal Aji Inaku, Awaluddin Hidayat Ramli Indah Kusumadewi Indah Kusumadewi, Indah Indradewa, Rhian Indro Sumantri Indro Sumatri Irawan Arif Budianto Irfan Ali J. Jamari Jaka Windarta Jihan Nabila Joni Safaat Adiansyah Kamandjaja, Vimala Kevin Aprilio Kusmiyati Kusmiyati Kusmiyati Kusmiyati Le, Tri Hieu Luqman Buchori M Christwardana M Christwardana M M A Nur M. Barbosa M. Djaeni M.M. Azimatun Nur M.M. Azimatun Nur, M.M. Azimatun Marcelinus Christwardana Marcelinus Christwardana Marcelinus Christwardana Marcelinus Christwardana Marcelinus Christwardana Marcelinus Christwardana Marcelinus Christwardana Marcelinus Christwardana Mardiyah Sari Dewi Maryono Maryono Matin, Hashfi Hawali Abdul Mega Anggraeni Mega Anggraeni Meiny Suzery Miftah Aqidatul Izzah Minh Tuan Pham Mochamad Arief Budihardjo Moh. Djaeni Moh. Djaeni Mohammad Alhuyi Nazari Mohammad Hossein Ahmadi Monica Kezia Sembiring Morteza Ebrahimi Muhamad Imaduddin Muhamad Irham Maulana Muhamad Maulana Azimatun Nur Muhamad Zaini Mahdi Muhammad Fadhil Muhammad Fajar Purnama Muhammad Helmi Muhammad Nasyarudin Iqbal Muhammad Zaini Mahdi Munifatul Izzati Nailawati Prastiya Ningrum Nainggolan, Irwan Firmanto Naseri, Ali Ndaru Okvitarini Ngadi, Norzita Nicholas Franz Noer Abyor Handayani Noor Fachrizal Noorzita Ngadi P Purwanto P. Purwanto Paryanto, Paryanto Permata, Ariyo Nurachman Satiya Perwana, Putu Yuri Aristya Pham, Minh Tuan Pham, Van Viet Pribadyo Pribadyo Prima Astuti Handayani Primadi Gayuh Laksono Putro Purwanto - Purwanto Purwanto Purwanto Purwanto Purwono Purwono Putri, Sylvia Rahmi R. Rochmadi R. Wijffels Rachmad Ardhianto Raka Sindu Wardoyo Ratna Dewi Kusumaningtyas Ratnawati Ratnawati Reistu Widiastutik Retno Wulandari Rifqi Ahmad Baihaqi Riky Yonas Riky Yonas Rini Budi Hastuti Rita Dwi Ratnani Riza Saadiah, Riza Rizal Isnanto, R RM Bagus Irawan Rochmadi, R. Rocky Adiguna Roghayeh Ghasempour Rufaida Nur Rostika Rya Abdurachim, Henna S Subandriyo S Sumarno S. Suherman S. Sulardjaka Sa'adah, Fatkhiyatus Sabda Wahyu Nugroho Sakina Tunissa Anarki Satrio Kuntolaksono Sestri Bela Pratiwi Setia Budi Sasongko Setiawan, M. Yasep Silviana Silviana Singgih Wibowo Sinuhaji, Tubagus Rayyan Fitra Siswo Sumardiono Siti Jamilatun Siti Jamilatun Sri Puji Lestari Sri Sumiyati Sri Widodo Agung Sueda Sri Widodo Agung Suedy Sudarno Sudarno Suherman Suherman Suherman, Suherman Sulardjaka Sulardjaka Sumarno Sumarno Susanto, Edy Suseno Darsono Sussatrio, Hardito Syafrudin Syafrudin Tahyatul Bariroh Teddy Mantoro Thomas Triadi Putranto, Thomas Triadi Titik Nurmawati Tony Suryo Utomo Tri Eko Wahjono Tri Hieu Le Tri Retnaningsih Tri Retnaningsih Soeprobowati Tubagus Rayyan Fitra Sinuhaji Tutuk Djoko Kusworo Uray Irzandi Uray Irzandi Valentino, Andreas Alvaro Van Viet Pham Vimala Kamandjaja Vita Efelina W. Widayat W. Wihermanto Wahyu Zuli Pratiwi Wais Alqurni Wicaksono, Vinsensius Priyo Widayat Widayat Widayat Widayat Widayat Widiyanto Widiyanto Widya FATRIASARI Windarta, Djaka Wiwie Chaeruni Yasinta Nikita Titisari Yasinta Nikita Titisari Yoyon Wahyono Yulian Mara Alkusma YULIANI, YENI Yulis Hindarwati Zakaria, Zainul Akmar Zin Min Tun