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All Journal Jurnal Rekayasa Proses PROSIDING SEMINAR NASIONAL Reaktor International Journal of Renewable Energy Development TEKNIK METANA JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Bahan Alam Terbarukan Seminar Nasional Teknik Kimia Kejuangan Jurnal Rekayasa Mesin Panrita Abdi - Jurnal Pengabdian pada Masyarakat Emerging Science Journal Communications in Science and Technology Jurnal Rekayasa Proses Jurnal Inovasi Teknik Kimia ASEAN Journal of Chemical Engineering Distilat: Jurnal Teknologi Separasi Jurnal Pasopati : Pengabdian Masyarakat dan Inovasi Pengembangan Teknologi Warta Perkaretan Jurnal Profesi Insinyur Indonesia International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Bahan Alam Terbarukan
Andri Cahyo Kumoro
Department Of Chemical Engineering, Faculty Of Engineering, Diponegoro University
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Studi Analisis Karakteristik Tingkat Polusi pada Penggunaan Insulator di Proyek SUTET 500 kV Paiton-Kalipuro Putra, Ade Septia; Kumoro, Andri Cahyo; Hermawan, Ferry
Jurnal Profesi Insinyur Indonesia Vol 3, No 1 (2025): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2025.25735

Abstract

Penelitian ini bertujuan untuk menentukan jenis dan spesifikasi insulator yang sesuai untuk jalur transmisi SUTET 500 kV Paiton-Kalipuro, dengan memperhatikan kondisi lingkungan dan tingkat polusi di area tersebut. Jalur transmisi ini memiliki panjang 147,78 km dengan 337 tower yang melintasi berbagai area, termasuk pantai, jalan, sungai, rel kereta api dan jaringan transmisi eksisting. Berdasarkan tingkat polusi yang tinggi (Very Heavy), diperlukan insulator dengan creepage distance minimum sebesar 17.050 mm. Perhitungan menunjukkan kebutuhan sebanyak 33 piringan insulator keramik tipe U 210 BP atau U 160 BLP, sesuai standar SPLN T3.008-1:2021. Selain itu, penelitian juga mengevaluasi potensi penggunaan insulator polimer, yang memiliki keunggulan seperti perawatan minimal, ketahanan terhadap korosi dan kemampuan tinggi menghadapi flashover, sehingga cocok digunakan di area pesisir yang berpolusi tinggi. Hasil penelitian ini memberikan rekomendasi spesifikasi insulator yang optimal untuk meningkatkan keandalan dan efisiensi operasional jalur transmisi SUTET 500 kV Paiton-Kalipuro. Kata kunci: insulator, polusi, SUTET 500 kV
Evaluasi Model Batu Bara dan Sequence Tambang PIT X Periode Triwulan 3 Tahun 2024 Alfariji, Moh; Silviana, Silviana; Kumoro, Andri Cahyo
Jurnal Profesi Insinyur Indonesia Vol 3, No 2 (2025): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2025.26860

Abstract

Pada umumnya, kegiatan pertambangan identik dengan kegiatan yang memiliki biaya dan risiko yang tinggi. Kendala utama yang terjadi pada aktivitas penambangan batu bara umumnya terkait dengan model batu bara yang menyimpang dari kondisi aktual. Oleh karena itu, evaluasi model batu bara dan sequence tambang yang baik sangat diperlukan sebagai acuan dalam kegiatan penambangan untuk mengontrol dan mengidentifikasi kesesuian perencanaan tambang terhadap perkembangan aktualnya. Tujuan dari penelitian ini adalah untuk mengevaluasi model batu bara dan sequence tambang PIT X terhadap progres aktual pada periode triwulan 3 tahun 2024. Evaluasi dipusatkan pada cadangan volumetrik (ton/bcm), spasial dan bentuk geometris dari bukaan tambang. Berdasarkan pada evaluasi model, secara umum teridentifikasi terjadinya penipisan lapisan batu bara dengan recovery model bulan Juli, Agustus dan September masing-masing sebesar 121%, 73% dan 82%. Evaluasi sequence tambang bulan Juli memiliki volume overcut 466,329 bcm, undercut 84,247 bcm dan on grade 172,685 bcm. Pada bulan Agustus, terverifikasi adanya volume overcut sebesar 43,273 bcm, undercut 94,009 bcm dan on grade 512,968 bcm. Sedangkan pada bulan September, tervalidasi volume overcut sebesar 25,400 bcm, undercut 94,509 bcm dan on grade 530,391 bcm. Hasil evaluasi juga menunjukkan bahwa ketercapaian kinerja produksi untuk bulan Juli, Agustus dan September masing-masing adalah 98%, 90% dan 84%. Kata kunci: batu bara, kinerja, model recovery, mine planning, sequence
Process Simulation of Oil Palm Empty Fruit Bunch (OPEFB) Pyrolysis using Open-Source DWSIM: Analysis of Temperature-Dependent Product Yields Utomo, Dani Puji; Andri Cahyo Kumoro; Muhammad Haqqiyuddin Robbani
Jurnal Bahan Alam Terbarukan Vol. 14 No. 1 (2025): June 2025 [Nationally Accredited Sinta 3]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v14i1.28723

Abstract

This study investigates the pyrolysis of Oil Palm Empty Fruit Bunches (OPEFB) using the open-source process simulation software DWSIM to evaluate the impact of temperature on product distribution, particularly bio-oil, biochar, and pyrolysis gas. OPEFB, an abundant lignocellulosic waste from Indonesia’s palm oil industry, holds significant potential as a renewable biomass feedstock. The simulation model was developed based on thermochemical conversion principles and was validated against selected experimental data from the literature. Results show that pyrolysis temperature significantly influences the yield and composition of the products. The gas yield increased with temperature up to 460°C, dominated by CO, CO₂, and H₂ due to the decomposition of volatile organic matter. However, gas yield declined beyond 460°C, likely due to secondary reactions converting gas precursors into liquid products. The optimal temperature was found to be around 510°C, offering a balanced yield of bio-oil and gas with minimal biochar formation. The chemical composition of bio-oil included furfural, phenols, alcohols, and acetic acid—compounds derived from the breakdown of cellulose, hemicellulose, and lignin. Biochar yield decreased with temperature, but its quality improved in terms of carbon content and fixed carbon fraction. This study highlights the utility of DWSIM as an accessible and transparent tool for simulating biomass pyrolysis. Future work should focus on refining the kinetic parameters, experimental validation of simulation results, and integrating downstream processing for fuel and chemical recovery.
Optimization of ultrasound assisted extraction of sappan (Caesalpinia sappan L) wood for preparation of high quality extract Djaeni, Moh; Budi Sasongko, Setia; Yuni Susanti, Devi; Mahatmanti, F Widhi; Cahyo Kumoro, Andri; Kurniasari, Laeli
Communications in Science and Technology Vol 10 No 1 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.1.2025.1710

Abstract

This study optimized the Ultrasound-Assisted Extraction (UAE) of sappan wood (Caesalpinia sappan L.) using Central Composite Design-Response Surface Methodology (CCD-RSM) and investigated its kinetics. Temperature, solvent-to-solid ratio, and extraction time were selected as independent variables with extract yield as the response. Analysis of Variance (ANOVA) showed that the solvent-to-solid ratio significantly affected yield. Optimal extraction conditions were 69.9°C, 29.9 mL/g, and 20.2 min, producing approximately yield of 0,293 mg GAE/g sample. High Performance Liquid Chromatography (HPLC) confirmed the presence of brazilin, while Fourier Transform InfraRed (FTIR) analysis indicated the retention of functional groups. UAE was shown to enhance extraction efficiency and preserve phenolic compounds. Additionally, the extraction process was modeled, resulting in a validated effective diffusivity (De) of 1.8 × 10?? cm²/s, The kinetic study was useful in industrial application especially to determine appropriate extraction time.
Incorporating silica synthesized from rice husk ash into a calcium oxide catalyst for biodiesel production Alhanif, Misbahudin; Mustafa, Mustafa; Kumoro, Andri Cahyo; Wahyono, Yoyon; Zaim, Hanif Fawwaz; Zahra, Nurul Afifah
Reaktor Volume 25 No.2 August 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.2.58-69

Abstract

Biodiesel represents a promising renewable energy alternative to either substitute or be blended with conventional diesel, offering advantages such as a high cetane number, reduced sulfur (SOx) and CO₂ emissions, and greater environmental sustainability. The application of calcium oxide (CaO) as a basic catalyst in biodiesel production has been extensively reported. However, its catalytic performance is limited by its sensitivity to moisture, which can negatively affect the reaction rate. In addition, some of the Ca2+ ions in the catalyst can dissolve in the mixture of biodiesel and glycerol, causing product contamination. This study aims to combine a CaO catalyst from marble powder with sulfonated silica (SiO2) from rice husk ash (RHA) to enhance the distribution of catalyst particles, reduce crystallinity, and increase the surface area of the catalyst. This study was conducted through chemical and thermal activation of SiO2 from RHA, sulfonation of SiO2, thermal activation of CaO from marble powder waste, and impregnation of CaO/SiO2 catalyst with variations in CaO/SiO2 composition (25%:75%, 50%:50%, 75%:25%). The results showed that the purity of SiO2 and CaO obtained through chemical and thermal activation was 93.67% and 99.13%, respectively. The sulfonation process on SiO2 successfully added –SO3 groups at 36.5%, which supported the formation of acid sites on the catalyst. Characterization showed that the surface morphology was composed of particles measuring 2–8 µm with a dominant amorphous structure. The addition of SiO2 gave rise to new crystal peaks but decreased the crystal intensity, especially at the 50%:50% composition. The composition of CaO/SiO2 at 75%:25% showed the best physical properties with a surface area of 22.24 m²/g, a pore volume of 65.29 mm³/g, and a pore diameter of 11.74 nm, indicating high potential as a bifunctional catalyst for biodiesel esterification–transesterification.
Studi Pengaruh Penambahan Komposisi Nano Hidroksiapatit pada Campuran Polylactide dan Poly Ɛ-Caprolactone terhadap Laju Degradasi Fiksasi Internal Pelat Tulang Solechan, Solechan; Andri Cahyo Kumoro; Sumardi Sumardi; Agus Suprihanto; Sulardjaka
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2025): Volume 20, Nomor 1, April 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i1.6070

Abstract

Pemulihan patah tulang menggunakan fiksasi internal pelat yang berfungsi mempertahankan pengurangan retak selama penyembuhan tulang. Fiksasi internal pelat direkomendasikan bersifat biodegradasi secara biologis yang terbuat dari biokomposit polylactide/poly ɛ-caprolactone/nano hidroksiapatit (PLA/PCL/nHA). Material ini memiliki kekuatan mekanik tinggi, namun susah mengontrol waktu laju degradasi. Tujuan penelitian ini menciptakan fiksasi internal pelat dari biokomposit PLA/PCL/nHA dengan laju degradasi dapat diprediksi. Metode pembuatan spesimen dengan Cold Isostatic Pressing (CIP) dengan variasi penambahan prosentase komposisi nHA. Tekanan kompaksi 40 MPa, temperatur sintering 150oC dan waktu penahanan 3 jam. Bertambahnya komposisi nHA mempercepat laju degradasi dan hilangnya berat spesimen. Penambahan komposisi nHA semakin besar untuk erosi permukaan semakin tinggi. Hasil ini untuk rencana implementasi spesimen pada tingkatan umur pasien. Spesimen penambahan 10 wt% nHA untuk pasien diatas umur 50 tahun atau lansia. Spesimen penambahan 20 wt% nHA untuk pasien dewasa, sedangkan spesimen penambahan 30 wt% nHA untuk pasien bayi dan anak-anak.
Enhanced Photocatalytic Performance and Kinetic Improvement of Reusable W-based POM Composite for Produced Water Treatment Kusworo, Tutuk Djoko; Kumoro, Andri Cahyo; Veda, Adalia; Mafazan, Rafi; Puspa, Meitri Bella; Azizah, Dita Aulia; Utomo, Dani Puji
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 2 Year 2026 (August 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20616

Abstract

Produced water treatment remains a major challenge due to its complex contaminant composition and the limited efficiency and reusability of conventional photocatalysts. Polyoxometalate (POM)-based materials offer high redox activity and structural tunability. This study presents a novel tungsten-based polyoxometalate (W-based POM) composite with enhanced photocatalytic performance and kinetic superiority for produced water treatment. The objective of this work was to synthesize a reusable W-based POM composite and systematically evaluate its photocatalytic activity, adsorption behavior, kinetics, and stability. The composite was synthesized via a solvothermal method using Na₂WO₄·2H₂O and DMF. Photocatalytic experiments were performed by varying catalyst dosage (0.1–0.5 g), irradiation time (30-180 min), and reusability cycles. The W-based POM composite exhibited a rhombic polyhedral morphology with a well-organized three-dimensional POM framework, reduced crystallite size (14.8 nm), and compressive lattice strain, contributing to improved charge mobility. Optical analysis revealed a red-shift in the absorption edge, reducing the band gap from 2.80 eV to 2.25 eV and enhancing visible-light utilization. Photocatalytic experiments demonstrated high treatment efficiency, achieving 90% NH₃–N and 84% total dissolved solids (TDS) removal under UV irradiation within 180 minutes at an optimal dosage of 0.3 g. Adsorption behavior followed the Dubinin–Radushkevich and Temkin isotherm models, indicating an ion-exchange-dominated mechanism, while kinetic analysis revealed a multi-step process governed by intraparticle diffusion. The composite maintained stable performance over three consecutive cycles without significant activity loss. Overall, the results highlight the strong potential of W-based POM composites as efficient, reusable, and scalable photocatalysts for advanced produced water treatment. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Studi Pengaruh Penambahan Komposisi Nano Hidroksiapatit pada Campuran Polylactide dan Poly Ɛ-Caprolactone terhadap Laju Degradasi Fiksasi Internal Pelat Tulang Solechan, Solechan; Kumoro, Andri Cahyo; Sumardi, Sumardi; Suprihanto, Agus; Sulardjaka, Sulardjaka
Jurnal Profesi Insinyur Indonesia Vol 3, No 3 (2025): JPII:
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2025.26858

Abstract

Pemulihan patah tulang menggunakan fiksasi internal pelat yang berfungsi mempertahankan pengurangan retak selama penyembuhan tulang. Fiksasi internal pelat direkomendasikan bersifat biodegradasi secara biologis yang terbuat dari biokomposit polylactide/poly ɛ-caprolactone/nano hidroksiapatit (PLA/PCL/nHA). Material ini memiliki kekuatan mekanik tinggi, namun susah mengontrol waktu laju degradasi. Tujuan penelitian ini menciptakan fiksasi internal pelat dari biokomposit PLA/PCL/nHA dengan laju degradasi dapat diprediksi. Metode pembuatan spesimen dengan Cold Isostatic Pressing (CIP) dengan variasi penambahan persentase komposisi nHA. Tekanan kompaksi 40 MPa, temperatur sintering 150°C dan waktu penahanan 3 jam. Bertambahnya komposisi nHA mempercepat laju degradasi dan hilangnya berat spesimen. Penambahan komposisi nHA semakin besar untuk erosi permukaan semakin tinggi. Hasil ini untuk rencana implementasi spesimen pada tingkatan umur pasien. Spesimen penambahan 10wt% nHA untuk pasien di atas umur 50 tahun atau lansia. Spesimen penambahan 20wt% nHA untuk pasien dewasa, sedangkan spesimen penambahan 30wt% nHA untuk pasien bayi dan anak-anak. Kata kunci: degradasi, fiksasi, pelat, nano hidroksiapatit, tulang
A Brief Overview of Corrosion Prevention and Inhibition: Past, Current and Future Technologies Fauzan, Ahmad -; Kumoro, Andri Cahyo; Purbasari, Aprilina; Abidin, Kharis Yohan
Reaktor Volume 25 No.3 December 2025
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.25.3.%p

Abstract

Corrosion is a process that degrades metal-based materials as a result of chemical reactions with their surrounding environment. For that reason, it causes serious problems across various industries, namely reduced material quality, increased maintenance costs, and extensive safety concerns. This paper presents a concise overview of corrosion prevention and inhibition methods, focusing on key strategies, such as material selection and the use of protective coatings, cathodic protection, and corrosion inhibitors. Furthermore, nano coatings, eco-friendly inhibitors, smart materials, corrosion modelling, and self-healing materials are also discussed as part of current advancements. In-depth understanding and appropriate implementation of these suggested methods are essential for extending material lifespan and improving operational efficiency of the overall industrial systems.            
Co-Authors . Widayat Adi Cifriadi Adi Cifriadi, Adi Agus Suprihanto Agus Suprihanto Aji Prasetyaningrum Alfariji, Moh Ana Farida Aprilina Purbasari Ardianingsih, Retno Arkie Septiana A. Arkie Septiana A. Aryanti, Nita Asep Muhamad Samsudin, Asep Muhamad Asron Ferdian Falaah Asron Ferdian Falaah, Asron Ferdian Avriliana Dewi A. Azizah, Dita Aulia Bakti Jos Bakti Jos Budiyono Budiyono C Sri Budiyati Catarina Sri Budiyati Catarina Sri Budiyati Catarina Sri Budiyati Cindi Yasintasia Dessy Ariyanti Diah Permata Wijayanti Diah Susetyo Retnowati Didi Dwi Anggoro Dwi Haryanti Dyah Hesti Wardhani Evi Ristanti R F Widhi Mahatmanti Fahni, Yunita Fauzan, Ahmad - Ferry Hermawan Fitra Pradhita Frans Arienata H. Frans Arienata H. Frastia, Wike H Hadiyanto H. Hargono Hacker, Viktor Hargono . Hargono Hargono Hargono Hargono Kamil, Muhamad Idham Kharis Yohan Abidin, Kharis Yohan Kristinah Haryani Kurniawan, Tonni Agustiono Laeli Kurniasari M. Djaeni Mafazan, Rafi Maharani Ratridewi Marcelinus Christwardana Margaretha Praba Aulia Marissa Widiyanti Masitah Hasan Misbahudin Alhanif Moh Djaeni Monica Setiono H. Muhammad Haqqiyuddin Robbani Mustafa Nafiunisa, Aininu Nasher, Kharissa Nita Aryanti Nor Basid Adiwibawa Prasetya Nur Rokhati Nurul Aini Pamungkas, Prihantoro Pandapotan, Boris Poltak Permanadewi, Indrasukma Puspa, Meitri Bella Putra, Ade Septia Ratnawati Ratnawati Retno Wulandari Riris Yuliana Y.S. Rizka Amalia Rizka Amalia Rizka Amalia Roschger, Michaela Saputri, Desi Riana Setia Budi Sasongko Silviana Silviana Sofiah Sofiah Sri Sinto Dewi Sulardjaka Sulardjaka Sulardjaka Sumardi . Sumardi Sumardi Tutuk Djoko Kusworo Utami, Esti Utomo, Dani Puji Veda, Adalia Wahyono, Yoyon Wahyudi, Dhiky Wardhani, Dyah Hesti Wikanastri Hersoelistyorini Wilis Ari Setyati Yuni Susanti, Devi Yusupandi, Fauzi Zahra, Nurul Afifah Zaim, Hanif Fawwaz