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Sainteknol : Jurnal Sains dan Teknologi
Published by Universitas Negeri Semarang
ISSN : -     EISSN : 25273604     DOI : https://doi.org/10.15294/sainteknol
Core Subject : Education,
Other
Sainteknol published a scientific paper on the results of research and studies in the field of science and technology. Published biannually in June and December contained the writings lifted from the results of research and critical-analysis study in science and technology.
Arjuna Subject : Umum - Umum
Articles 27 Documents
 1   2   3 
Provincial-Level Dynamic Modeling of Climate Influence on Agriculture and Consumption: Case Studies in Central Java, East Java, Bali, and North Sumatra Ariyani Wardhana; Ruci Meiyanti; Handy Noviyarto; Kelik Budiana
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.33623

Abstract

Indonesia’s agricultural sector is increasingly exposed to climate change, as shifts in rainfall, temperature, and humidity disrupt crop yields and farmer livelihoods. These disruptions weaken domestic supply and heighten reliance on external sources. To capture regional differences, this study examines East Java, Central Java, Bali, and North Sumatra, using a Power BI-based interactive dashboard to integrate climate indicators, production data, commodity prices, and consumption patterns from 2018 to 2021. The results highlight distinct provincial dynamics. In Bali, yields respond positively to humidity but decline with rainfall, while Central Java’s rice production is strongly shaped by rainfall variability. East Java’s horticultural crops are highly sensitive to humidity and temperature, and North Sumatra’s diversified systems show inverse effects from all three climate variables. Correlation analyses suggest that higher harvest yields slightly reduce commodity prices, particularly for rice, shallots, and garlic; the coefficients remain weak (–0.1 to –0.4), reflecting the role of transportation, market access, and trade pressures. By visualizing these relationships, the dashboard underscores interconnected vulnerabilities such as dependence on staple crops, reliance on imports, and affordability challenges. It also provides policymakers with a practical tool to monitor climate-related risks and price instability. Overall, the findings emphasize the need for integrated food security policies that combine climate science, crop management, and economic equity to support sustainable outcomes across Indonesia.
GIS-Driven Comparative Analysis of Multi-Hazard Risks in Rural Villages: Insights from Licin District, Indonesia Welayaturromadhona; M Ardy Ardan; Agus Triono; Riska Laksmita Sari; Eriska Eklezia Dwi Saputri; Hadziqul Abror
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.39577

Abstract

In this study, the Geographic Information System (GIS) is used to assess the risk of multiple hazards in eight rural villages of Kecamatan Licin, Banyuwangi Regency, Indonesia. The study looks at six natural disasters, including floods, earthquakes, forest fires, droughts, volcanic eruptions, and landslides. It maps and classifies the level of risk using Digital Elevation Models (DEM), soil amplification factors, the Standardized Precipitation Index (SPI), and Kawasan Rawan Bencana (KRB) zonation. Weighted overlay and fuzzy logic were used to calculate the risk level of each village (low, medium, or high) with the standardized hazard factors. The results demonstrate that the risks are in very different locations. Tamansari and Kluncing villages are highly prone to multiple hazards, for instance, due to their proximity to volcanic zones, steep slopes, and floodplains. On the other hand, villages of Licin and Pakel have high risks from volcanic lahar and landslide. Villages that are close to the ground, like Banjar and Gumuk are more susceptible to flooding, while places that do not hold on to rain are more susceptible to drought. The study illustrates how risks can intersect. For example, 32% of the Tamansari area is at high risk for flooding, landslides, and volcanoes at the same time. The GIS-based framework provides useful information for selecting the best disaster prevention plans by encouraging tailored actions based on the peculiar risk profiles of each town. The results show the significance of spatial analysis to develop more disaster-resilient rural areas. This is in conformity with the Sustainable Development Goals for disaster risk reduction.
Performance of Natural Ventilation in Residential Buildings under Different Opening Conditions Fisa Savanti; Hari Utama; Hanif Ardhiansyah
Sainteknol : Jurnal Sains dan Teknologi Vol. 23 No. 2 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v23i2.44731

Abstract

Natural ventilation is widely applied in tropical residential buildings to improve indoor environmental quality and reduce cooling energy demand. However, increasing opening size does not always proportionally enhance ventilation performance. This study aims to experimentally determine the relationship between inlet opening variation and natural ventilation performance in a residential test room (6.0 m × 2.5 m × 3.5 m; 52.5 m³) oriented along the Southwest–Northeast axis. The investigation was conducted by measuring variations in indoor air velocity, temperature, relative humidity, and estimating the air change rate (ACH) under different inlet opening conditions. The inlet door opening was varied from 20% to 100%, while the outlet door remained fully open. Results indicate a non-linear relationship between opening variation and ventilation performance. Indoor air velocity increased from 0.09 m s⁻¹ at 20% opening to a maximum of 0.11 m s⁻¹ at 60%, then decreased at larger openings. ACH followed a similar trend, peaking at the intermediate configuration. Temperature differences remained minimal, confirming the dominance of wind-driven airflow, while relative humidity varied with airflow distribution and dilution effects. The findings suggest that moderate inlet openings may provide more efficient ventilation than fully open configurations in tropical residential buildings.
Synthesis of Biodegradable Bioplastic from Xanthan Gum (XCD) Recovered from Hi-Vis Sweep Waste Generated during Well Service Operations in Bunyu Field Dyta Silvia Mayasari; Widi Astuti; Ratna Dewi Kusumaningtyas; Dewi Selvia Fardhyanti
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.54050

Abstract

Well service operations in the oil and gas industry utilize sweep fluids based on xanthan gum (XCD), which generate high-viscosity waste with the potential to cause environmental pollution. Due to its natural polymer characteristics, XCD waste has significant potential to be utilized as a raw material for biodegradable bioplastic production. This study aims to synthesize and characterize biodegradable bioplastics derived from XCD waste generated from Hi-Vis sweep operations during well service activities in Bunyu Field. The bioplastics were prepared using the solution casting method with variations in XCD concentration (1.0–2.0%), plasticizer type (glycerol and sorbitol), and plasticizer concentration (20–40%). The resulting bioplastics were characterized through film thickness, water absorption, and biodegradation rate tests. The experimental data were further analyzed using Response Surface Methodology (RSM) based on a Central Composite Design (CCD).The results showed that increasing plasticizer concentration enhanced both water absorption capacity and film flexibility. Bioplastics plasticized with glycerol exhibited a higher biodegradation rate compared to those containing sorbitol. These findings demonstrate that XCD waste from Hi-Vis sweep operations can be effectively valorized as an environmentally friendly raw material for biodegradable bioplastic production.
Batch Adsorption Performance of a KOH-Activated Corn Cob Carbon–Calcined Fly Ash Composite for Multi-Pollutant Removal Nurcahyo; Unung Leoanggraini; Alfiana Adhitasari; Ghaniari Putri; Khumaira Maulani Wijaya; Rony Sihombing
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.63136

Abstract

The discharge of dye and heavy metal-containing wastewater remains a major environmental challenge, highlighting the need for low-cost, effective adsorbents. This study evaluated the batch adsorption performance of a composite adsorbent KOH-activated corn cob carbon combined with calcined coal fly ash toward methylene blue (MB), cadmium (Cd²⁺), and hexavalent chromium (Cr(VI)). Corn cob carbon was prepared via carbonization and KOH activation, while fly ash was calcined before composite preparation. SEM-EDS and BET analyses characterized the adsorbent’s physicochemical properties. KOH activation raised the corn cob carbon’s surface area from 8.80 to 40.88 m²/g, while calcination increased the fly ash’s surface area from 0.32 to 1.65 m²/g, indicating improved surface development. Under optimum conditions (5:1 fly ash-to-carbon ratio, 90-mesh particle size), the composite achieved removal efficiencies of 99.39% for MB (0.40 mg/g) and 99.56% for Cd²⁺ (1.659 mg/g), showing strong performance toward cationic pollutants. Cr(VI) removal, however, reached only 25.37% (1.723 mg/g), likely due to unfavorable electrostatic interactions between the adsorbent surface and anionic chromium species under the tested conditions. Overall, the composite showed promising adsorption performance for cationic contaminants, while further modification is needed to improve its effectiveness against anionic pollutants like Cr(VI).
Continuous Adsorption of and Cr (VI) Using a KOH-activated Corn Cob Carbon-Coal Fly Ash Composite Rony Sihombing; Alfiana Adhitasari; Shoerya Shoelarta; Tifa Paramitha; Ghaniari Putri; Khumaira Maulani Wijaya
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. 2 (2026): December 2026 (In Press)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i2.63139

Abstract

Industrial wastewater containing divalent cadmium (Cd₂⁺) and hexavalent chromium (Cr (VI)) poses a serious environmental threat because of the toxicity, persistence, and bioaccumulative nature of these heavy metals. This study aimed to evaluate the performance of a composite adsorbent, prepared from KOH-activated corn cob carbon (CCAC) and calcined coal fly ash (FA) at a mass ratio of 5:1, for the continuous adsorption of Cd₂⁺ and Cr (VI). The adsorbent was characterized using Fourier Transform Infrared (FTIR) spectroscopy, while continuous adsorption experiments were performed in an up-flow acrylic column at an initial metal concentration of 100 mg/L, evaluating the effect of flow rate (5–25 mL/min) on Cd₂⁺ removal and comparing it with Cr (VI) removal from real industrial wastewater at 5 mL/min. FTIR analysis confirmed that KOH activation and calcination modified the surface functional groups of the CCAC and FA, respectively, increasing the availability of oxygen-containing active sites. The composite adsorbent achieved a high and consistent Cd₂⁺ removal efficiency of 91.13–91.51%, with an adsorption capacity of 4.18–4.19 mg/g, across all tested flow rates. In contrast, Cr (VI) removal was very low (0.797%), attributed to electrostatic repulsion between the anionic Cr (VI) species and the negatively charged adsorbent surface at near-neutral pH, as well as competition from co-existing ions in the real wastewater matrix. These findings indicate that the FA/CCAC composite is a promising, low-cost, waste-derived adsorbent for continuous Cd₂⁺ removal, while further surface modification or pH adjustment is required to enhance its performance for Cr (VI) removal.
Study on the Effectiveness of H₂SO₄ Activated Coffee Grounds and Imperata cylindrica Bioadsorbents for Methylene Blue Adsorption Unung Leoanggraini; Tifa Paramitha; Rahma Ardelia Raissa; Mutiara Nur Annisa; Muhammad Salman Alfarisi; Radianti Novita Sari; Rony Sihombing
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.63663

Abstract

Textile wastewater with methylene blue dye causes serious environmental issues because of its toxicity, persistence, and negative effects on aquatic life. Using agricultural waste as bioadsorbents provides a sustainable and low-cost way to remove dye from wastewater. The goal of this study was to assess how effective H₂SO₄-activated bioadsorbents made from coffee grounds and Imperata cylindrica are for methylene blue adsorption in batch systems. We prepared the bioadsorbents by carbonizing them at 450°C, followed by chemical activation with 2 M sulfuric acid. We characterized them using FTIR and SEM to study functional groups and surface shape. We conducted batch adsorption experiments by changing the adsorbent mass (0.15–0.3 g), contact time (30–120 minutes), and methylene blue concentration (10–100 mg/L). Langmuir and Freundlich isotherm models were used to evaluate the adsorption behavior. The results showed that activated coffee grounds and Imperata cylindrica had improved porosity and changes in functional groups after activation. The best adsorption conditions were found with an adsorbent mass of 0.3 g, a contact time of 120 minutes, and a methylene blue concentration of 10 mg/L, reaching an adsorption efficiency of up to 97.498%. The adsorption process fit the Langmuir isotherm model better, with maximum adsorption capacities of 42.735 mg/g for coffee grounds and 13.210 mg/g for Imperata cylindrica. These findings suggest that coffee grounds and Imperata cylindrica are promising, cost-effective bioadsorbents for removing methylene blue in textile wastewater treatment.

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