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Dedi Purwanto Indra Kusuma
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RESWARA: Jurnal Riset Ilmu Teknik
Published by Lembaga Penelitian dan Pendidikan (LPP) Kalibra
ISSN : -     EISSN : 30259444     DOI : https://doi.org/10.70716/reswara
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
RESWARA: Jurnal Riset Ilmu Teknik is a leading scholarly platform that examines the strategic role of engineering disciplines in advancing the Sustainable Development Goals (SDGs). The journal is dedicated to publishing recent research, innovations, and engineering solutions that support sustainable development. The editorial board welcomes manuscripts based on theoretical frameworks and empirical research. The journal scope covers scientific knowledge and research-based information, including applied research and recent developments in engineering research and development. The primary focus includes Civil Engineering and Spatial Planning, Industrial Engineering, Electrical Engineering and Informatics, Earth Science Technology, and Naval Architecture. All manuscripts published in RESWARA undergo a double-blind peer review process. The final decision on manuscript acceptance rests with the Editorial Board, based on recommendations from independent peer reviewers.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 131 Documents
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Pengaruh Penyerapan β-Karoten pada CPO dengan Variasi Perbandingan antara Pasir Kuarsa dengan Biochar Cangkang Kelapa Sawit sebagai Adsorben Ari Auditia Jurlian Pratama; Rafael Remit Winardi
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.632

Abstract

Crude Palm Oil (CPO) contains β-carotene, a natural pigment that gives it a yellowish-red color and serves as an indicator of palm oil quality. This study aims to determine the effect of varying ratios of quartz sand and oil palm shell biochar as adsorbents on β-carotene content and CPO quality. The adsorbents were prepared through a melting process using a furnace, then activated with a 1 M NaOH solution and applied to CPO using the column method. The parameters observed included β-carotene content, Deterioration of Bleachability Index (DOBI), free fatty acid (FFA) content, and moisture content. The data were analyzed using normality and homogeneity tests, One-Way Analysis of Variance (ANOVA), followed by Duncan’s Multiple Range Test (DMRT) at a significance level of 5%. The results showed that variations in the ratio of quartz sand to oil palm shell biochar had a significant effect on the DOBI value (p=0.007), β-carotene content (p<0.001), and FFA content (p=0.003), while they had no significant effect on moisture content (p=0.512). Treatment P3 produced the best β-carotene adsorption capacity with a β-carotene concentration of 385,500 ppm and the lowest ALB content of 3.4867%, while P1 had the highest DOBI value of 2.420. Thus, the combination of quartz sand and oil palm shell biochar has the potential to be used as an alternative adsorbent to improve CPO quality by reducing β-carotene content without significantly affecting moisture content.
Pengaruh Konsentrasi Asam Sulfat (H₂So₄) pada Proses Hidrolisis Lignoselulosa Batang Kelapa Sawit Terhadap Kadar Gula Terlarut dan Gula Reduksi Asylih Za’rara Hasibuan; Heri Purwanto
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.639

Abstract

Oil palm plantations produce solid biomass, one of which is the oil palm trunk, which contains cellulose. The cellulose content in oil palm trunks has the potential to produce bioethanol if processed through hydrolysis to break down polysaccharides into sugars. The objective of this study was to determine the effect of varying sulfuric acid (H₂SO₄) concentrations on the hydrolysis process for producing fermentable sugars from oil palm trunk substrate. The study design employed a Non-Factorial Complete Randomized Design consisting of 3 treatment levels—variations in H₂SO₄ concentration (1 M, 2 M, 3 M)—each with 3 replicates (for a total of 9 samples). Statistical analysis utilized ANOVA and Duncan’s post-hoc test at a 95% confidence level. Dissolved sugar content was measured using a refractometer (% Brix), while reducing sugar was determined using the Nelson-Somogyi method with a UV-Vis spectrophotometer at a wavelength of 540 nm. The hydrolysis was conducted at 90°C for 100 minutes. The highest sugar concentration was obtained from the 3 M treatment, at 18.80% Brix with a reducing sugar content of 428.54 ppm. Duncan’s test showed that the 3 M concentration differed significantly from 1 M (310.71 ppm) and 2 M (340.23 ppm), while 1 M and 2 M did not differ significantly. In conclusion, a 3 M H₂SO₄ concentration is the optimal condition for the hydrolysis of oil palm stems, yielding a significantly higher reducing sugar content.
Pembuatan Ekoenzim Berbasis Limbah Kulit Pisang (Musa Paradisiaca) secara Anaerob dan Aplikasinya pada Crude Palm Oil (CPO) Yudi Romaito Rambe; Zakwan Zakwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.657

Abstract

High levels of free fatty acids (FFA) in crude palm oil (CPO) are one of the main problems in the palm oil industry because they can reduce product quality and export competitiveness. On the other hand, abundant banana peel waste has not been optimally utilized, even though it contains various bioactive compounds that have the potential to be used as raw materials for eco-enzymes. This study aims to produce ecoenzymes based on banana peel waste (Musa paradisiaca) through anaerobic fermentation and to evaluate their effect on reducing FFA and moisture content in CPO. The study employed an experimental design using a non-factorial Complete Randomized Design (CRD). The ecoenzyme was prepared using a banana peel:molasses:water ratio of 3:1:10 and fermented for 90 days. The ecoenzyme was applied to CPO in three treatments—5 mL, 10 mL, and 15 mL—each with three replicates. The results showed that the resulting ecoenzyme had a pH of 3.40, a TDS of 3,922 ppm, and a temperature of 31°C. The initial ALB content of CPO, which was 26.47%, was successfully reduced to 14.83%, 12.75%, and 10.69% in the 5 mL, 10 mL, and 15 mL treatments, respectively. Statistical analysis showed that all treatments had a significant effect on reducing ALB (p<0.05). Thus, banana peel waste-based ecoenzymes have the potential to serve as an environmentally friendly alternative for reducing ALB levels in CPO while supporting the sustainable utilization of organic waste.
Production of Bioethanol from Oil Palm Stumps with Varying Levels of Ammonium Sulfate ((NH₄)₂SO₄) Added through a Fermentation Process Using Tape Yeast Ananda Braga Raihan; Heri Purwanto
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.658

Abstract

Oil palm trunk is a lignocellulosic biomass with significant potential as a raw material for bioethanol production due to its cellulose and hemicellulose content, which can be converted into fermentable sugars. This study aimed to determine the effect of ammonium sulfate ((NH₄)₂SO₄) supplementation on bioethanol production from oil palm trunk through a fermentation process using tape yeast. The research procedure included raw material preparation, hydrolysis to produce simple sugars, fermentation using tape yeast, and analysis of the resulting bioethanol content. Ammonium sulfate was used as a nitrogen source to support the growth and metabolic activity of microorganisms during fermentation. Different concentrations of ammonium sulfate were applied to obtain optimal fermentation conditions. The results showed that the addition of ammonium sulfate affected bioethanol production. Adequate nitrogen availability enhanced microbial growth, resulting in a more efficient conversion of sugars into ethanol. However, excessive nutrient addition could reduce fermentation efficiency by disrupting microbial activity. The findings indicate that oil palm trunk can be used as an alternative feedstock for bioethanol production, and that an appropriate concentration of ammonium sulfate can improve fermentation performance and increase bioethanol yield.
Pengaruh Variasi Suhu dan Waktu Terhadap Pembuatan Kertas Karton dari Pelepah Kelapa Sawit Menggunakan Metode Kraft Grace Stevi Wildiana Manik; Muhammad Syukri
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.660

Abstract

As the oil palm plantation industry continues to expand in Indonesia, the amount of waste generated also increases, including solid waste in the form of oil palm fronds. This waste has not been utilized optimally, even though its availability increases with the age of the plantation. One potential utilization of oil palm fronds is as a raw material for paperboard production because they contain 51.58% cellulose. This study aimed to determine the effect of cooking temperature and cooking time on the production of paperboard made from oil palm fronds. The research was conducted at the Chemical Industrial Process Laboratory, University of Sumatera Utara, from March to April 2026. The study consisted of two factors. The first factor was cooking temperature with three levels: L1 (90°C), L2 (95°C), and L3 (100°C). The second factor was cooking time with three levels: T1 (90 minutes), T2 (120 minutes), and T3 (150 minutes). The results showed that cooking temperature and cooking time had a highly significant effect on two observed parameters, namely tensile strength (18.05 kN/m) and water absorption (80.00 g/m²), but did not have a significant effect on grammage (g/m²).
Effectiveness of Acid-Activated Oil Palm Fiber and Quartz Sand Adsorbents in Reducing Wastewater Pollutant Parameters Hari Ananda Syahputra Siregar; Rafael remit Winardi
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.662

Abstract

Abstract: Palm oil mill wastewater contains high concentrations of organic pollutants and suspended solids that may degrade environmental quality if discharged without proper treatment. This study evaluated the effectiveness of acid-activated oil palm fiber and quartz sand as column adsorbents for improving wastewater quality. The experiment employed a quantitative laboratory approach using a completely randomized design with three adsorbent ratios, namely 1:1, 1:2, and 1:3, each with three replications. The observed parameters included total suspended solids (TSS), total dissolved solids (TDS), color, biochemical oxygen demand (BOD), chemical oxygen demand (COD), and pH. The results showed that the adsorbent column was highly effective in reducing color and moderately effective in lowering BOD and COD, but it increased TSS and TDS. The best color removal was obtained at the 1:2 ratio with a final concentration of 22.00 TCU and an efficiency of 92.93%. The greatest BOD reduction occurred at the 1:3 ratio with a final concentration of 41.03 mg/L and an efficiency of 66.15%, while the best COD reduction was observed at the 1:1 ratio with a final concentration of 233.53 mg/L and an efficiency of 23.63%. The pH increased from 4.81 to 8.34-9.09 after treatment. ANOVA indicated that adsorbent ratio significantly affected BOD and COD, but did not significantly influence TSS, TDS, color, or pH. These findings suggest that acid-activated oil palm fiber and quartz sand have potential as alternative adsorbent media for palm oil mill wastewater treatment, particularly for color and biodegradable organic load removal.  
Karakterisasi Biochar Pelepah Kelapa Sawit Hasil Pirolisis Berdasarkan Analisis Proksimat, pH, dan FTIR Galuh Puja Kesuma; Siti Aisyah
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.663

Abstract

Oil palm fronds (OPF) are the most abundant lignocellulosic biomass waste from oil palm plantations in Indonesia, yet remain underutilized. This study aims to characterize biochar produced from oil palm fronds through pyrolysis at 350–400°C for 4 hours under limited oxygen conditions. Characterization was conducted through proximate analysis (moisture content, ash content, volatile matter, and fixed carbon), pH measurement, and functional group analysis using Fourier Transform Infrared (FTIR) spectroscopy. This research employed a descriptive quantitative method with 2 replications. Proximate analysis results showed moisture content of 2.88%, ash content of 11.9%, volatile matter of 32.1%, and fixed carbon of 53.1%. The biochar pH value was 10.1, categorized as alkaline. FTIR analysis at UPT Integrated Laboratory, Universitas Negeri Malang identified 10 absorption peaks in the range of 447.57–2339.70 cm⁻¹, indicating functional groups characteristic of lignocellulosic-based biochar, including C–H, C–C, C–O, C=C, C=O, and aromatic ring structures. Comparison with SNI 06-3730-1995 standards shows that only the moisture content parameter meets the requirements. Despite this, the alkaline pH and detected functional groups suggest strong potential for OPF biochar application as a soil amendment, particularly for acid soils commonly found in Indonesian plantations.
Analysis of the Effect of Soil Classification on Displacement and Inter-story Drift of Reinforced Concrete Buildings Dermawan Zebua; Bimawijaya Laia; Jun Fajar Krisman Giawa; Kevin Berkat Mendrofa
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.665

Abstract

The seismic performance of reinforced concrete (RC) shophouse buildings is strongly influenced by local soil conditions, which affect the amplification of ground motion and the dynamic response of structures during earthquakes. This study aims to analyze the effect of soil classification on displacement and inter-story drift in a reinforced concrete shophouse building subjected to seismic loading. A quantitative research approach was employed using Response Spectrum Analysis (RSA) in accordance with the provisions of SNI 1726:2019. The structural model was analyzed under three different soil classifications, namely Site Class SC (very dense soil), Site Class SD (medium soil), and Site Class SE (soft soil), while maintaining identical structural geometry, material properties, and loading conditions. The results indicate that soil classification significantly affects the seismic response of the building. The maximum roof displacement increased from 42.8 mm for Site Class SC to 76.9 mm for Site Class SE, representing an increase of 79.67%. Similarly, the maximum inter-story drift ratio increased from 0.72% to 1.42%, corresponding to an increase of 97.22%. The highest displacement and drift values were consistently observed under soft soil conditions due to greater seismic wave amplification and increased flexibility of the soil-structure system. Although all analyzed cases satisfied the drift limitations specified by SNI 1726:2019, buildings located on soft soil sites exhibited significantly higher deformation demands. The findings demonstrate that soil classification is a critical parameter in seismic design and should be carefully considered during the planning and analysis of reinforced concrete shophouse buildings to ensure structural safety and resilience in earthquake-prone regions.
Ergonomic Risk and Work Productivity among Manual Material Handling Workers at PT BIELOGA: A REBA-Based Analysis Trisnanda Anugrah; Hery Irwan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.685

Abstract

Manual material handling activities are commonly associated with awkward working postures, repetitive movements, and excessive physical load, which may increase the risk of musculoskeletal disorders and reduce work productivity. This study aims to assess ergonomic risk levels and analyze their relationship with work productivity among manual material handling workers at PT BIELOGA using the Rapid Entire Body Assessment (REBA) method. This research employed a descriptive quantitative approach. Data were collected through direct observation of workers’ postures during manual handling activities, REBA assessment, Nordic Body Map responses, and productivity measurement based on output and task completion efficiency. The findings showed that the observed manual handling activities were classified into moderate to high ergonomic risk categories, with REBA scores ranging from 5 to 9. The highest ergonomic risks were found in material loading activities and material transfer to racks, which involved trunk flexion, reaching posture, repetitive movement, and external load exposure. The analysis indicated a strong negative relationship between REBA scores and work productivity, suggesting that higher ergonomic risk tends to be followed by lower productivity performance. These findings indicate that ergonomic risk is not only related to occupational health concerns but also to operational performance. Therefore, ergonomic interventions such as workstation redesign, adjustment of material placement height, improvement of manual handling procedures, task rotation, and the use of assistive devices are recommended to reduce ergonomic risk and support productivity improvement.
Analysis of Primary Drainage System Capacity in Supporting Urban Flood Resilience for the NUFReP Project Muziburrahman Muziburrahman; Muh. Apriansyah; Sulis Syaputri
RESWARA: Jurnal Riset Ilmu Teknik Vol. 4 No. 3 (2026): RESWARA: Jurnal Riset Ilmu Teknik, July 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v4i3.693

Abstract

Urban flooding in Santi Village, Bima City, remains a problem despite the implementation of the National Urban Flood Resilience Project (NUFReP). This study aims to analyze the capacity of the primary drainage system to support urban flood resilience. The study employs a mixed-methods approach through hydrological and hydraulic analyses, as well as modeling using the Storm Water Management Model (SWMM). The hydrological analysis yielded a design flood discharge of 14.79 m³/s, while the hydraulic analysis indicated a primary drainage capacity of 45.46 m³/s with a flow velocity of 2.37 m/s. The SWMM simulation results showed that the water level remained below the channel’s peak elevation without any overflow or surcharging, indicating that the channel capacity remains adequate with a utilization rate of approximately 32.53%. The study concluded that the primary drainage capacity is still capable of accommodating the design flood discharge, while the potential for flooding is more significantly influenced by sedimentation, debris blockages, and suboptimal maintenance and connectivity of the drainage network.

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