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Jurnal Teknologi
Published by Universitas Muhammadiyah Jakarta
ISSN : 20851669     EISSN : 24600288     DOI : -
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering
This journal is a scientific journal to develop knowledge in the field of Engineering & Technology. Editors invite professionals from education and researcher to write about the progress of science in the field of Engineering & Technology. The journal is published 2 (two) times in 1 year.
Arjuna Subject : -
Articles 303 Documents
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Analysis of Coastline Changes with the Utilization of Geospatial-Based Sentinel Imagery Karlos, Birto; Belladona, Meilani; Supriyono
Jurnal Teknologi Vol. 17 No. 2 (2025): Jurnal Teknologi
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.17.2.143-156

Abstract

Coastline is a dynamic phenomenon influenced by natural forces such as waves, currents, tides, and human activities such as coastal resource extraction and infrastructure development. Using Sentinel-2 imagery and geospatial technology, this study seeks to examine the changes in the coastline in the coastal areas of Lais, Air Besi, and Air Napal Districts, North Bengkulu Regency. The approach used includes image processing with geometric correction, Normalized Difference Water Index (NDWI), coastline digitization, and accuracy testing using a fusion matrix. The results of the analysis show that between 2019 and 2024 there will be considerable changes in the coastline, with an average erosion rate of 1,71 Meters per year. Some areas, such as Pasar Bembah 2.39 meters per year, Pal-30 2,182 meters per year, and Air Padang Village 3,293 meters per year, have experienced significant erosion. Air Padang Village is among the areas most affected by abrasion. Limiting human activities in areas prone to abrasion, planting coastal vegetation, and building sea walls are important strategies that can be used to reduce the impact of abrasion and shoreline changes.
Feasibility Design: Case Study of Rooftop PV System for Pharmaceutical Company Iskandar, Handoko Rusiana; Fuadiyyah, Siti Syamroatul
Jurnal Teknologi Vol. 17 No. 2 (2025): Jurnal Teknologi
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.17.2.101-114

Abstract

According to 2019 data, solar energy represents the most significant potential for renewable energy (RE), totalling 207.8 GW. This has propelled the use of solar renewable energy across all industrial sectors, emphasizing ecologically sustainable energy derived from photovoltaic (PV) technology. This context has propelled the design and empirical evaluation of a grid tied rooftop PV system for the load of an Air Handling Unit (AHU) at a corporation. This study delineates various PV roof-top design methodologies, encompassing K2 base system simulation, solar energy potential (kWh/m2/day), available area, component generation capacity, and an analysis of the Levelized Cost of Energy (LCOE), Net Present Cost (NPC), and PV contributions to the RE and PLN grid sources utilizing Homer software. The modelling and analytical results produced an average solar energy of 4.81 kW/m²/day. The usable area encompasses 3,140 m², accommodating 1,324 panels capable of producing 52.6 kWp of energy to meet the existing electricity demand of 5,808 kW/day. The total energy produced is 756,389 kWh, with a renewable share of 33.5%. The NPC value is Rp43,680,200,000.00, the LCOE is Rp1,050.30, the reduction value is 5.8%, and the running cost is Rp2,013,450,000. In contrast to the electricity provided by Grid at 2,119,920 kWh/year, the PV contribution is 1,502,835 kWh/year, resulting in a 29% reduction in emissions.
The Effect of Bentonite Activation and Its Application on Reducing Metal Ions Levels in Wastewater Estiarny, Resfy Ella; Agustina, Tuty Emilia; Sari, Tuti Indah; Gayatri, Rianyza
Jurnal Teknologi Vol. 17 No. 2 (2025): Jurnal Teknologi
Publisher : Faculty of Engineering Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jurtek.17.2.115-122

Abstract

Heavy metal pollution such as Cu²⁺, Fe³⁺, and Pb²⁺ metal ions resulting from industrial and laboratory activities has become a serious environmental issue due to their toxic and bio-accumulative nature. This study aims to evaluate the adsorption effectiveness of natural bentonite and bentonite activated chemically with H₂SO₄ followed by thermal treatment at 300 °C. The activation process was intended to enhance surface area, porosity, and the number of active sites on the bentonite surface. Adsorption experiments were conducted using synthetic wastewater containing Cu, Fe, and Pb metal ions with varying adsorbent masses (1–5 grams), and surface morphology characterization was performed using SEM-EDX. Results showed that acid-thermal activated bentonite had a more porous and fragmented surface structure compared to natural bentonite, contributing to higher adsorption efficiency. At an adsorbent mass of 5 g, Pb removal reached 92.5% with acid-thermal activated bentonite, whereas natural bentonite achieved only 85.5%. Additionally, the removal efficiency of Fe³⁺ and Cu²⁺ ions also significantly increased after activation. These findings indicate that chemical and thermal activation synergistically enhance the performance of bentonite as an effective adsorbent for treating hazardous wastewater containing heavy metals.

Page 31 of 31 | Total Record : 303

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