Synthesis of dual-fiber cellulose aerogel from oil palm empty fruit bunch and banana petiole combined with graphene oxide for oil spill adsorption Maktum Muharja, Husnul Khotimah, Difka Augustina Diana Sari, Ika Putri Nikmatur Rohmah, Siska Nuri Fadilah, Candra Wijaya, Dendy Satrio Case Studies in Chemical and Environmental Engineering, 2026 Oil spills remain a critical environmental challenge, necessitating sustainable, efficient, and economically viable adsorption materials. In this study, dual-fiber cellulose aerogels were synthesized from oil palm empty fruit bunches (OPEFB) and banana petiole fibers and reinforced with graphene oxide (GO) to enhance adsorption performance and mechanical stability. The aerogel with a 2:2 cellulose ratio exhibited the most favorable structure, with a low density of 0.031 g/cm 3 , high porosity of 0.982, and strong hydrophobicity indicated by a contact angle of 113.32°. GO incorporation significantly enhanced oil uptake, with the aerogel containing 80 mg/g GO achieving a maximum adsorption capacity of 5.4 g/g and maintaining stable performance over four reuse cycles. Adsorption kinetics were best described by the pseudo-second-order model (R 2 up to 0.966; k 2 up to 0.945 g/g·min), suggesting that chemisorption played a dominant role in the adsorption process. Mechanical performance was markedly improved by GO reinforcement, resulting in a bending strength of 178.44 MPa, approximately four times higher than that of the GO-free aerogel. Cost analysis indicated a production cost of US$ 0.452/g, which is comparable to previously reported cellulose-based aerogels. These results demonstrate the potential of dual-fiber cellulose/GO aerogels as scalable and mechanically robust materials for oil spill remediation. • Dual-fiber aerogels from OPEFB and banana petiole produced an optimal porous structure at a 2:2 ratio. • Graphene oxide enhanced mechanical strength and oil selectivity. • Aerogel showed high porosity, low density, and strong hydrophobicity. • Optimal condition achieved 5.4 g/g oil adsorption and good reusability. • Cost-effective and magnetically recoverable adsorbent for oil spill cleanup.
Elevated butanol and acetone bio-production with integrated co-extraction in lime-buffered fermentation using high cell concentration Maktum Muharja, Rizki Fitria Darmayanti, Yukihiro Tashiro, Kenji Sonomoto, Mamata Singhvi, Ghoson M. Daba, Ika Putri Nikmatur Rohmah, Abdul Halim, Dendy Satrio, Arief Widjaja Case Studies in Chemical and Environmental Engineering, 2026 Butanol and acetone bioproduction face inhibition from excessive substrates, leading to acid crashes. Buffering stabilizes acidity and aids product formation, whereas simultaneous extraction prolongs cell productivity. This study aimed to enhance butanol and acetone production by co-extraction with a biocompatible extractant mixture in buffered fermentation. Fed-batch extractive fermentation was conducted by comparing the volumes of the large and small extractants. Then, 3 g/L of lime (CaCO3) was used as a buffering agent, and integrated co-extraction was performed using a mixture of oleyl alcohol and tributyrin (1:1 v/v). The accumulated broth-based total concentrations of butanol and acetone reached 67.9 g/L and 34.1 g/L, with yields of 0.536 and 0.234 C-mol/C-mol, respectively, indicating high substrate consumption efficiency. The extractant mixture demonstrated selective coextraction with easier phase separation. This result is attractive for large-scale production that requires high concentrations to increase the efficiency of product purification.
Structural Strength Assessment of Stiffened Panels Under Torsional Loads Through Finite Element Modeling Fatih Ahmad Fachriza, Teguh Putranto, I Ketut Aria Pria Utama, Dendy Satrio, Noorlaila Hayati Journal of Composites Science, 2026 Stiffened panels are fundamental structural components that maintain the integrity of engineering structures subjected to torsional loading, making accurate strength assessment essential in design and evaluation. Conventional finite element method (FEM) analyses often involve complex geometric modeling and extensive pre-processing, which can reduce efficiency and limit practical applicability. This study presents a structured FEM-based framework supported by a Python-based interface that streamlines model generation while preserving analytical rigor. The interface assists in geometry definition, meshing, material assignment, and boundary condition implementation, thereby improving consistency and reducing pre-processing time without altering the numerical formulation. Nine stiffened panel configurations were investigated by combining three plate thicknesses with three longitudinal stiffener geometries. The results indicate that increasing plate thickness significantly enhances torsional resistance. Stiffener geometry also markedly influences structural response: the 80 × 80 × 8 stiffener provides the highest resistance under general torsional loading, whereas the 100 × 65 × 9 stiffener exhibits superior performance under pure torque conditions. Overall, the results demonstrate that the proposed framework provides a consistent and efficient approach for evaluating the torsional strength of stiffened panels.
Potential of Edu-Ecotourism Based on OTEC Utilizing Indonesian Post-Operation Offshore Oil/Gas Facilities Fadrian Athaya Muzhaffar, Mukhtasor, Dendy Satrio, Shade Rahmawati, Widi Agoes Pratikto, Hasan Ikhwani, Arfie Ikhsan Firmansyah Bio Web of Conferences, 2026 Indonesia is striving to meet its growing electricity demands in a sustainable way, by moving away from oil and gas sources. The government, particularly in East Kalimantan, is considering the repurposing of the offshore facilities for Ocean Thermal Energy Conversion (OTEC), which not only provides a clean and sustainable electricity, but also offers additional benefits such as agricultural and aquaculture products. This study will look at how OTEC may be integrated into an edu-ecotourism concept, which aims to promote renewable energy technology and create a sustainable economy that benefits local communities and stakeholders. To meet the study's aims, research of the possible use of OTEC as an edu-ecotourism attraction will be conducted, through papers that are reviewed from previous studies to further the understanding and the potential implementation of OTEC for edu-ecotourism. The OTEC itself is planned to have the capability of producing around 20 kW of net power. Therefore, analysis and review of potential uses and benefit of OTEC is crucial to integrate the multi-functionality of OTEC to cater not just to the goal of creating an edu-ecotourism attraction, but also to the various needs of the various stakeholders, that have a part or affected by this project.
Hydrodynamic Responses of Floating Oscillating Water Column for Wave Energy Conversion Faiz Nur Fauzi, Dendy Satrio, Ristiyanto Adiputra E3s Web of Conferences, 2026 Wave energy is a promising renewable resource due to its high-power density, predictability, and relatively low environmental impact. Oscillating Water Columns (OWCs) have been widely investigated as wave energy converters (WECs), yet floating platforms remain limited by motion responses that reduce stability and efficiency. This study examines the hydrodynamic response of a pontoon-type floater with a centered moonpool for OWC applications. Numerical simulations were performed using the Boundary Element Method (BEM) in ANSYS AQWA, focusing on the heave response amplitude operator (RAO). Case configurations included the moonpool length-to-floater length ratio ( l/L ) of 0.5, 0.4, and 0.3; moonpool width-to-floater beam ratio ( b/B ) of 0.5, 0.25, and 0.1; and drafts of 1.6, 2.4, and 3.2 m, combined through cross-variation. Validation against experimental results confirmed the reliability of the numerical approach. The results indicate that smaller floaters with higher l/L ratios and larger drafts produce higher heave RAO values, while larger floaters are less affected by the moonpool. Overall, increasing floater size enhances stability and reduces the amplifying effect of draft and moonpool variations on heave response.
The Influence of Ocean Thermal Energy Conversion System Efficiency on Net Power Output Navik Puryantini, Dendy Satrio, Ristiyanto Adiputra, Silvianita E3s Web of Conferences, 2026 Indonesia has great potential for utilizing Ocean Thermal Energy Conversion (OTEC) due to its strategic tropical conditions. This study analyzes the sensitivity of main parameters on the net power output of a 10 MW OTEC system based on the Organic Rankine Cycle (ORC) using Aspen Plus simulation. Variations on surface seawater temperature, deep seawater temperature, turbine efficiency, working fluid pump efficiency, and seawater pump efficiency were carried out. The simulation results show that turbine efficiency is the dominant factor, where an increase from 92% to 96% raised the net power from 9332 kW to 9958 kW. Seawater pump efficiency also gave a significant contribution by increasing the net power, while the working fluid pump efficiency only produced small improvement on the scale of tens of kilowatts. On the other hand, variations in warm and cold seawater temperatures had a limited effect. This happens because other parameters, such as mass flow rate of working fluid and seawater, were kept constant in the simulation, so temperature increase alone was not enough to influence system performance. These findings confirm that OTEC optimization is more effective through improving the efficiency of main components, especially the turbine and seawater pump.
Scouring Analysis and Mitigation Strategies for Scouring on Offshore Jacket Foundations D Asnawi, Suntoyo, D Satrio Iop Conference Series Earth and Environmental Science, 2026 As offshore jacket foundations gain popularity for their structural advantages, their vulnerability to seabed scouring—localized erosion caused by hydrodynamic forces—presents a significant engineering challenge. Scouring can severely compromise a foundation’s bearing capacity, threatening structural integrity and operational safety. This study develops a three-dimensional numerical model using FLOW-3D to comprehensively analyze the effects of scouring on 4-leg jacket foundations under various environmental conditions. The research investigates three primary mitigation strategies: riprap, concrete collars, and a novel geotextile-artificial vegetation (geo+grass) combination. Our findings indicate that scouring depth increases non-linearly with flow velocity and that the combined effects of waves and currents are more destructive than either alone. Crucially, the numerical model successfully simulates the complex vortex shedding and sediment transport patterns responsible for scouring. The geotextile-artificial vegetation system demonstrated the highest effectiveness, reducing scour depth by up to 63% compared to unprotected scenarios. This study provides a validated predictive framework for assessing scour risk and offers a sustainable, highly effective mitigation strategy, contributing valuable insights for the design and long-term management of offshore infrastructure.
Risk Based Decision Making for Decommissioning of Fixed Jacket Platforms Silvianita, A C Wibowo, D Satrio, M F Khamidi Iop Conference Series Earth and Environmental Science, 2026 Decommissioning offshore platforms demands thorough consideration of various factors to ensure alignment with technical viability, environmental sustainability, regulatory requirements, and socio-economic responsibilities. This study assesses different decommissioning approaches for the jacket fixed offshore platform in West Madura Offshore, which has been out of operation since 2006 at a water depth of 63 feet. This paper uses Analytical Hierarchy Process (AHP) and Best Practicable Environmental Option (BPEO) to evaluate the integrates expert opinions to prioritize four key criteria: cost, technical feasibility, environmental impact, and socio-economic benefits. The results shows that the Leave in Place alternative stands out as the most balanced option given the current site conditions, especially regarding environmental protection and cost-effectiveness. However, this choice requires implementing proper safeguards such as navigational risk assessments and obtaining relevant regulatory approvals. The study underscores the value of transparent, multi-criteria evaluations to support responsible decommissioning decisions in shallow-water environments.
Optimization of Savonius Water Turbine Performance through Geometric Overlap Ratio Analysis Using Computational Fluid Dynamics Muhammad Farisan Zhafiri, Gunawan Prasetyo, Bhre Wangsa Lenggana, Ameliyana Rizky Syamara Putri Akhmad Yani, Dendy Satrio, Aditya Rio Prabowo, Dandun Mahesa Prabowoputra Journal of Physics Conference Series, 2026 The Indonesian government focuses on national energy security, which is aligned with the Sustainable Development Goals (SDGs) for clean, affordable energy. Hydropower, the country’s largest renewable energy source, offers significant opportunities for optimization. This study aims to improve the efficiency of Savonius water turbines designed for low-head river flows by identifying the best geometric overlap ratio for maximum power generation. Three-dimensional Computational Fluid Dynamics (CFD) simulations with a Shear Stress Transport (SST) turbulence model were performed under steady-state conditions. The performance of Savonius rotor models with overlap ratios of 0, 0.02, and 0.03 was investigated at a constant inlet water velocity of 0.5 m/s. The results demonstrate that the overlap ratio significantly influences the power coefficient (Cp). The 0.03 overlap configuration yielded the best performance, achieving a maximum Cp of 0.249, surpassing the other variants. The use of this overlap can increase the performance of the Savonius rotor by 6% compared to the conventional Savonius rotor design. This finding concludes that implementing an optimal overlap ratio is crucial for improving the efficiency of Savonius hydrokinetic turbines, thereby supporting the broader effort to optimize renewable energy utilization in Indonesia.
Can Indonesian Maritime Education Harness Big Data to Meet the Belt and Road Initiative’s Demands? Fuad Mahfud Assidiq, Syerly Klara, Imam Faried Assalam, Un Ryong Rim, Nur Azisah, Fachruddin Abdul Chaidir, Liany Ayu Catherine, Dendy Satrio, Dwiki Timur Pratama Bakri, Aurel Putri Arinda, Lidia Putri Simarmata Handbook of Digitalization and Big Data in the Water Sector International Case Studies Volume 3, 2026
Synthesis of dual-fiber cellulose aerogel from oil palm empty fruit bunch and banana petiole combined with graphene oxide for oil spill adsorption M Muharja, H Khotimah, DAD Sari, IPN Rohmah, SN Fadilah, C Wijaya, ... Case Studies in Chemical and Environmental Engineering 13, 101346 , 2026 2026 Citations: 1
Elevated butanol and acetone bio-production with integrated co-extraction in lime-buffered fermentation using high cell concentration M Muharja, RF Darmayanti, Y Tashiro, K Sonomoto, M Singhvi, GM Daba, ... Case Studies in Chemical and Environmental Engineering, 101376 , 2026 2026
Structural Strength Assessment of Stiffened Panels Under Torsional Loads Through Finite Element Modeling FA Fachriza, T Putranto, IKAP Utama, D Satrio, N Hayati Journal of Composites Science 10 (3), 133 , 2026 2026
Optimization of Savonius Water Turbine Performance through Geometric Overlap Ratio Analysis Using Computational Fluid Dynamics MF Zhafiri, G Prasetyo, BW Lenggana, ARSPA Yani, D Satrio, ... Journal of Physics: Conference Series 3188 (1), 012017 , 2026 2026
Enhanced Performance of Cross-Flow Savonius Turbines at Low Current Velocity: A Numerical Investigation on the Influence of Deflector Configurations D Satrio, RA Adipradana, MA Mubarok, M Muharja, T Tuswan, ML Hakim, ... NAŠE MORE: znanstveni časopis za more i pomorstvo 73 (1), 0-0 , 2026 2026
Potential of Edu-Ecotourism Based on OTEC Utilizing Indonesian Post-Operation Offshore Oil/Gas Facilities FA Muzhaffar, Mukhtasor, D Satrio, S Rahmawati, WA Pratikto, H Ikhwani, ... BIO Web of Conferences 216, 09004 , 2026 2026
Risk Based Decision Making for Decommissioning of Fixed Jacket Platforms Silvianita, AC Wibowo, D Satrio, MF Khamidi IOP Conference Series: Earth and Environmental Science 1585 (1), 012044 , 2026 2026
The Effect of Fixed Pile Platform Integration on Point Absorber Device Performance for Wave Energy Utilization BA Suprapto, D Satrio, DM Prabowoputra, Tuswan, FM Assidiq, ... IOP Conference Series: Earth and Environmental Science 1585 (1), 012031 , 2026 2026
Scouring Analysis and Mitigation Strategies for Scouring on Offshore Jacket Foundations D Asnawi, Suntoyo, D Satrio IOP Conference Series: Earth and Environmental Science 1585 (1), 012016 , 2026 2026
The Influence of Ocean Thermal Energy Conversion System Efficiency on Net Power Output N Puryantini, D Satrio, R Adiputra, Silvianita E3S Web of Conferences 687, 01011 , 2026 2026 Citations: 1
Numerical study on the effect of vortex generator geometry and placement on single-blade performance in vertical axis current turbines D Rahuna, IKAP Utama, E Erwandi, D Satrio Brodogradnja 77 (4), 77401 , 2026 2026
Can Indonesian Maritime Education Harness Big Data to Meet the Belt and Road Initiative's Demands? FM Assidiq, S Klara, IF Assalam, UR Rim, N Azisah, FA Chaidir, ... Handbook of Digitalization and Big Data in the Water Sector, 30-62 , 2026 2026
Hydrodynamic Responses of Floating Oscillating Water Column for Wave Energy Conversion FN Fauzi, D Satrio, R Adiputra E3S Web of Conferences 687, 01010 , 2026 2026
Artificial reefs for coastal wetland and estuary protection and coral restoration: A review S Suwardi, AH Dwito, S Dendy, VK Tiffany, A Prakoso, FL Putro, MR Hanif, ... Maritime Technology and Research 8 (1), 281096-281096 , 2026 2026 Citations: 2
Enhancing Structural Integrity and Mitigating Environmental Risks in LNG Transport: A Smoothed Particle Hydrodynamics Analysis of Perforated Baffle Geometries T Tuswan, AR Prabowo, A Trimulyono, DP Sari, D Satrio, H Nubli IOP Conference Series: Earth and Environmental Science 1565 (1), 012006 , 2025 2025
Investigation of the efficacy of Derris elliptica extract as a green corrosion inhibitor for mild steel in hydrochloric acid solutions S Musabikha, A Nikitasari, S Prifiharni, R Kusumastuti, Y Lestari, A Royani, ... Physica Scripta 100 (10), 105004 , 2025 2025
Numerical study of non-linear twisted blades for tidal turbines improvement NR Arini, PAP Atmojo, D Saputra, D Satrio International Journal of Advances in Applied Sciences 14 (3), 894-906 , 2025 2025
Replace Experimental and Numerical Study on Ocean Current Turbine Performance with Innovative Idea Using Toroidal Propeller D Satrio, MFR Al Azizy, DEA Putra, SJ Pasma, DA Wahyudo, ZA Sulthana International Journal of Offshore and Coastal Engineering 9 (1) , 2025 2025
Investigation of enhanced peak lift performance and stall angle delay by attachment of Vortex Generators on blade surfaces of Vertical Axis Ocean Current Turbine D Satrio, D Rahuna Ocean Engineering 326, 120762 , 2025 2025 Citations: 5
Experimental investigation of convergent flow disturbances for performance enhancement of vertical-axis ocean current turbine at low current speed in Indonesia M Madi, R Yanda, MC Untoro, D Satrio, T Tuswan, MGN Bangsa Transactions on Maritime Science 14 (1) , 2025 2025 Citations: 4
MOST CITED SCHOLAR PUBLICATIONS
The influence of time step setting on the CFD simulation result of vertical axis tidal current turbine D Satrio, IKAP Utama, Mukhtasor Journal of Mechanical Engineering and Sciences 12 (1), 3399-3409 , 2018 2018 Citations: 68
Experimental investigation into the improvement of self-starting capability of vertical-axis tidal current turbine D Satrio, IKAP Utama Energy Reports 7, 4587-4594 , 2021 2021 Citations: 60
Vertical Axis Tidal Current Turbine: Advantages and Challenges Review D Satrio, IKAP Utama, Mukhtasor Proceeding of Ocean, Mechanical and Aerospace -Science and Engineering- 3, 64-71 , 2016 2016 Citations: 42
The advantage of flow disturbance for vertical-axis turbine in low current velocity D Satrio, Suntoyo, LI Ramadhan Sustainable Energy Technologies and Assessments 49, 101692 , 2022 2022 Citations: 31
Performance of modified hollow fiber membrane silver nanoparticles-zeolites Na–Y/PVDF composite used in membrane bioreactor for industrial wastewater treatment RF Darmayanti, M Muharja, A Widjaja, N Widiastuti, RA Rachman, ... Heliyon 9 (11) , 2023 2023 Citations: 30
Numerical simulation of cross-flow Savonius turbine for locations with low current velocity in Indonesia D Satrio, FY Muhammad, Mukhtasor, S Rahmawati, S Junianto, ... Journal of the Brazilian Society of Mechanical Sciences and Engineering 44 … , 2022 2022 Citations: 30
Numerical Investigation of Contra Rotating Vertical-Axis Tidal-Current Turbine D Satrio, IKAP Utama, Mukhtasor Journal of Marine Science and Application 17 (2), 208-215 , 2018 2018 Citations: 28
State of the art in floating tidal current power plant using multi-vertical-axis-turbines S Junianto, WN Fadilah, AF Adila, D Satrio, S Musabikha 2022 International Electronics Symposium (IES), 97-103 , 2022 2022 Citations: 26
Numerical simulation of foil with leading-edge tubercle for vertical-axis tidal-current turbine IKAP Utama, D Satrio, M Mukhtasor, M Atlar, W Shi, R Hantoro, G Thomas Journal of Mechanical Engineering and Sciences 14 (3), 6982-6992 , 2020 2020 Citations: 26
Influence of the canal width and depth on the resistance of 750 DWT Perintis ship using CFD simulation ES Hadi, T Tuswan, G Azizah, B Ali, S Samuel, ML Hakim, MRCP Hadi, ... Brodogradnja: An International Journal of Naval Architecture and Ocean … , 2023 2023 Citations: 25
The Influence of Deflector on the Performance of Cross-flow Savonius Turbine D Satrio, KA Adityaputra, S Suntoyo, S Silvianita, WL Dhanistha, ... International Review on Modelling and Simulations (IREMOS) 16 (1), 27-34 , 2023 2023 Citations: 22
Analysis of the effects of fuel type selection on the performance and fuel consumption of a steam power plant D Satrio, N Trisnayanthi, J Pratilastiarso Int. J. Adv. Sci. Eng. Inf. Technol. 11 (5), 2046-2054 , 2021 2021 Citations: 22
The Benefit Using a Circular Flow Disturbance on the Darrieus Turbine Performance D Satrio, S Suntoyo, E Erwandi, F Albatinusa, T Tuswan, ML Hakim International Journal on Engineering Applications (IREA) 11 (1), 55-63 , 2023 2023 Citations: 21
Effect of positioning a circular flow disturbance in front of the Darrieus turbine D Satrio, Suntoyo, F Albatinusa, S Junianto, S Musabikha, Madi, ... IOP Conference Series: Earth and Environmental Science 1166 (1), 012019 , 2023 2023 Citations: 20
Analysis of the Effect of Cooling Water Condenser to Power Plant Cycle Using Cycle-Tempo Software I Kurniawati, J Pratilastiarso, D Satrio IES 2020 - International Electronics Symposium: The Role of Autonomous and … , 2020 2020 Citations: 20
Numerical study the effect of gap ratio on flow characteristics and heat transfer in staggered tube banks MN Ariansyah, L Diana, D Satrio IOP Conference Series: Earth and Environmental Science 972 (1), 012065 , 2022 2022 Citations: 18
Upaya Peningkatan Nilai Produk Olahan Hasil Laut dan Partisipasi Gerakan Gemar Makan Ikan bagi Kelompok Wanita dan Anak Nelayan YS Hadiwidodo, RW Prastianto, S Rahmawati, WL Dhanis, D Satrio Sewagati 5 (2), 106-111 , 2021 2021 Citations: 17
Experimental study on the effect of foil guide vane on the performance of a straight-blade vertical axis ocean current turbine M Madi, M Mukhtasor, D Satrio, T Tuswan, A Ismail, R Rafi, P Yunesti, ... NAŠE MORE: znanstveni časopis za more i pomorstvo 71 (1), 1-11 , 2024 2024 Citations: 16
Effects of the distance ratio of circular flow disturbance on vertical-axis turbine performance: An experimental and numerical study D Satrio, HB Widyawan, MA Ramadhani, M Muharja Sustainable Energy Technologies and Assessments 63, 103635 , 2024 2024 Citations: 16
Optimization of microwave-assisted extraction in the purification of triglycerides from non-edible crude Calophyllum inophyllum oil as biodiesel feedstock using artificial … B Azhar, S Gunawan, M Muharja, C Avian, D Satrio, HW Aparamarta South African Journal of Chemical Engineering 47 (1), 312-321 , 2024 2024 Citations: 16
