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Reaktor
Published by Universitas Diponegoro
ISSN : 08520798     EISSN : 24075973     DOI : https://doi.org/10.14710/reaktor.xx.x.xx-xx
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Materials Science & Nanotechnology
Reaktor invites contributions of original and novel fundamental research. Reaktor publishes scientific study/ research papers, industrial problem solving related to Chemical Engineering field as well as review papers. The journal presents paper dealing with the topic related to Chemical Engineering including: Transport Phenomena and Chemical Engineering Operating Unit Chemical Reaction Technique, Chemical Kinetics, and Catalysis Designing, Modeling, and Process Optimization Energy and Conversion Technology Thermodynamics Process System Engineering and products Particulate and emulsion technologies Membrane Technology Material Development Food Technology and Bioprocess Waste Treatment Technology
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "volume 26 no.1 april 2026" : 5 Documents clear
Comparative Kinetic Modelling and Performance Evaluation Of Immobilized Media Using Zeolite and Biokeramic In an Anaerobic Fixed-Bed Reactor Treating Dairy Sludge Waste Harun Pampang; Maria Assumpta Nogo Ole; Dian Ranggina; Prisca Caesa Moneteringtyas
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.82403

Abstract

This study evaluates the performance of anaerobic fixed-bed reactors using two different immobilization media, natural zeolite and porous bioceramic, for treating dairy sludge waste. Kinetic modeling was performed using Monod, Contois, and Moser models, implemented by MATLAB to determine substrate degradation (sCOD) and methane production rates. The results indicated that for the zeolite media, the Moser model provided the best fit R2 of 0.9287 and RMSE of 500.12 mg/L with an exponential constant (n) of 2.92, reflecting high microbial sensitivity and synergistic effects in the biofilm. In contrast, the bioceramic media showed higher statistical stability across all models, with the Monod and Moser models achieving an identical R2 of 0.9939. However, a significant functional discrepancy was observed, while bioceramic provided superior statistical fitting, it failed to facilitate effective methanogenesis, with methane concentrations remaining below 10%. Zeolite, despite a slightly lower statistical fit, achieved a peak methane concentration of 37.82% on day 6. This suggests that zeolite's cation exchange capacity effectively mitigates ammonia inhibition from protein-rich dairy sludge, a factor not captured by simplified empirical deterministic kinetic models. This research emphasizes that statistical stability in kinetic modeling did not inherently correlate with bio-energy recovery efficiency, affrim the importance of media selection.
Assessment of TiO₂–C-dots Nanocomposites Derived from Tofu Liquid Waste for Post-Mining Soil Remediation: Its Application in Bengkulu Province Jhon Lucky Silalahi; Mokhammad Khatami
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.79958

Abstract

This paper critically evaluates the technological feasibility of producing TiO₂–carbon dots (C-dots) nanocomposites from tofu liquid waste as a biomass-derived carbon precursor for soil remediation in a post-mining environment. Rather than assuming conversion efficiency or economic viability, the analysis is structured around the synthesis routes, composite fabrication strategies, and process–structure–performance relationships curated from the relevant literature. Biomass-to-C-dots conversion pathways, including hydrothermal, microwave-assisted, and pyrolytic methods, are assessed with respect to feedstock tolerance, operational conditions, and product characteristics. Integration strategies between C-dots and TiO₂, namely in situ growth, impregnation, and sol–gel hybridization, are assayed in terms of their interfacial coupling, stability, and photocatalytic relevance for heavy-metal immobilization. A regional case context from Bengkulu Province is used solely to illustrate feedstock availability and chemical relevance, without extrapolating to production yield or economic feasibility. The results demonstrate that the functional performance of TiO₂–C-dots systems is governed primarily by synthesis parameters and composite architecture rather than by precursor volume. Current evidence situates this technology at an early development stage, where reproducible fabrication and interfacial engineering remain the principal determinants of applicability. These findings provide a process-centered framework for evaluating biomass-derived photocatalytic composites while avoiding premature feasibility claims unsupported by mature conversion technologies.
Preparation of Bio-Oil and Biochar through Co-Pyrolysis of Pennisetum purpureum and HDPE Plastic Waste at Various Feedstock Ratios and Temperatures Asfihani Asfihani; Azhari Azhari; Adi Setiawan
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.80547

Abstract

This study investigates the co-pyrolysis process of elephant grass (Pennisetum purpureum) and HDPE plastic waste and evaluates the properties of the resulting bio-oil and biochar. The process was conducted in a pilot-scale reactor under a nitrogen atmosphere using a two-stage heating scheme at 300°C and 450°C, with biomass–HDPE weight ratios of 100:0, 90:10, 75:25, 60:40, and 50:50. The method used in this work includes product yield analysis, thermophysical characterization, GC–MS-based chemical composition analysis, and ANOVA statistical validation to determine the optimum conditions for Pennisetum purpureum–HDPE co-pyrolysis process. The results indicate that the addition of HDPE does not increase the absolute yield of bio-oil but significantly enhances its energy quality. The calorific value of the bio-oil increased from 10,579 cal/g for pure biomass to a maximum of 12,029 cal/g at a 75:25 biomass–HDPE weight ratio, accompanied by a compositional shift from oxygenated compounds toward the dominance of fatty acid methyl esters (FAME) and medium- to long-chain hydrocarbons. At the same ratio, biochar achieved the highest yield (44.93% w/w) while maintaining characteristics suitable for energy applications. These findings identify the 75:25 biomass–HDPE ratio as the optimum condition based on both experimental and statistical evidence, and demonstrate that biomass–HDPE co-pyrolysis is an effective strategy for waste utilization and for enhancing the quality of renewable energy products.
Treatment of Palm Oil Mill Effluent by an Integrated Aeration–Bipolar Electrocoagulation System Febrianto Adi Nugroho; Handoko Rusiana Iskandar; Nadiem Anwar; Tiara Ariani Putri; Putu Teta Prihartini Aryanti
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.78989

Abstract

Electrocoagulation (EC) has increasingly been used in wastewater treatment, including palm oil mill effluent (POME), due to its ease of operation and less sludge production. In this study, POME was treated using an integrated aeration and EC process, which was conducted continuously at a constant flow rate of 500 mL.min-1. The agitation process was applied in the EC reactor at a rotating speed of 20 rpm to shorten the electrolysis reaction time. The EC reactor was equipped with 6 electrodes as baffles. Two current densities (12 and 15A.m-2) and electrode configurations (3A-3C and 2A-2C-2B) were used, and the resulting effluents were compared. The experimental results showed that the highest contaminant removal was achieved with the electrode configuration 2A-2C-2B and the current intensity was 15 A. The BOD removal efficiency was 91.36% (from 132 to 11.4 mg.L-1), COD of 81.27% (from 386 to 72.3 mg.L-1), TDS of 47.64% (from 645.5 to 338 mg.L-1), TSS of 76.27% (from 43.7 to 10.4 mg.L-1), and turbidity of 96.46% (from 59.65 to 2.11 NTU). Meanwhile, the total energy requirement was 21.33 kWh.m-3 with the pH of the effluent of 8.05. The combination of aeration-EC can be used as an alternative POME treatment to achieve high contaminant removal efficiency.
Comparative Simulation and Modeling of Hydrogen Explosion Consequences Based on TNT Equivalent Virda Nur Lu'lu; Hary Devianto; Pramujo Widiatmoko
Reaktor Volume 26 No.1 April 2026
Publisher : Department of Chemical Engineering, Faculty of Engineering, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/reaktor.82563

Abstract

Hydrogen is increasingly adopted as a low-carbon energy carrier, creating a need for rapid and auditable blast-consequence screening to inform hazard zoning. This study develops a web-based simulation platform that automates a transparent TNT-equivalent workflow from minimal inputs (inventory volume and evaluation distance). The platform converts volume to mass, estimates TNT-equivalent charge using an energy basis and efficiency factor, applies Hopkinson–Cranz cube-root scaling, and predicts peak side-on overpressure using three well-established empirical correlations (Crowl and Louvar, Alonso, and Sadovski) under harmonized assumptions, while exporting calculation logs for traceability. Validation uses a Type-IV high-pressure hydrogen vessel-burst dataset with measurements at 2–18 m. Over the sensor-intact 6–18 m window, the Alonso correlation achieves MAE 6.006 kPa with R² 0.999, whereas Crowl and Louvar and Sadovski correlations yield MAEs of 18.136 kPa and 17.164 kPa with R² of 0.985 and 0.993. A 50 kg TNT-equivalent Gangneung 2019 case gives 50.9–86.7 kPa at 15 m and 3.58–6.34 kPa at 100 m, consistent with reported steel deformation and widespread glazing damage. Overall, the platform enables transparent, traceable preliminary consequence estimation to support hazard-zoning decisions for hydrogen storage.

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