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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 3 Documents
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Search results for , issue "Volume 26 No.1 April 2026" : 3 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 Pampang, Harun; Nogo Ole, Maria Assumpta; Ranggina, Dian; Moneteringtyas, Prisca Caesa
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.26.1.%p

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.
Technology Review of TiO₂–C-Dots Nanocomposites from Tofu Liquid Waste: Implications for Post-Mining Soil Remediation in Bengkulu Province Silalahi, Jhon Lucky; Khatami, Mokhammad
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.26.1.%p

Abstract

This review critically examines 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 post-mining environments. Rather than assuming conversion efficiency or economic viability, the analysis is structured around synthesis routes, composite fabrication strategies, and process–structure–performance relationships reported in the literature. Biomass-to-C-dots conversion pathways, including hydrothermal, microwave-assisted, and pyrolytic methods, are evaluated 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 assessed in terms of 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 review demonstrates 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.
Properties of Bio-Oil and Biochar Produced through Co-Pyrolysis of Pennisetum purpureum and HDPE Plastic Waste at Various Feedstock Ratios and Temperatures Asfihani, Asfihani; Azhari, Azhari; Setiawan, Adi
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.26.1.%p

Abstract

This study investigates the co-pyrolysis of elephant grass (Pennisetum purpureum) and HDPE plastic waste to evaluate the properties of the resulting bio-oil and biochar. The process was conducted in a fixed-bed batch 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 integration of 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. 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 12,029.91 cal/g at a 75:25 ratio, accompanied by a compositional shift from oxygenated compounds toward a dominance of fatty acid methyl esters (FAME) and medium- to long-chain hydrocarbons. At the same ratio, biochar exhibited the highest yield (44.93%) 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.

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