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Journal of Sustainable Technology and Applied Science
Published by Institut Teknologi Nasional Malang
ISSN : -     EISSN : 27222403     DOI : https://doi.org/10.36040/jstas.v1i2
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Energy Engineering Industrial & Manufacturing Engineering
JSTAS (Journal of Sustainable Technology and Applied Science) is the online journal under the Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) ITN Malang. JSTAS ready to publish research articles, a review from the researchers associated with the field of sustainable technology, engineering, and applied science. The journal aims to integrate the study of these disciplines to achieve sustainable development (SD) and help to stimulate debate with a view to defining common, effective responses to tomorrow’s challenges.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 57 Documents
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CHEMICAL DELIGNIFICATION OF MALANG ARABICA COFFEE HUSK WASTE FOR ALTERNATIVE ENERGY Anggorowati, Dwi Anna; Setyawati, Harimbi; Handaratri, Anitarakhmi; Dewi, Rini Kartika; Surbakti, Sriliani
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 1 (2025): Journal of Sustainable Technology and Applied Science, May 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i1.8131

Abstract

Malang Regency is an area that has the potential to be the largest coffee producer in Indonesia. The coffee processing in Malang Regency will yield approximately 65% coffee beans and 35% coffee husk waste, resulting in an estimated production of about 3,235 tons of coffee husk waste from a total coffee productivity of 9,245 tons. The coffee husk, a by-product of coffee processing, is a waste that has not been utilized to its full potential. Generally, people only use it for fodder and compost. The coffee husk waste contains a lignin content of 29%, hemicellulose at 24%, and the highest cellulose at 33%. Adequate cellulose content of the material for the manufacture of bioethanol is more than 30%; from the composition of Arabica coffee husk, the cellulose content is more than 30%. So it can be used as an alternative fuel, like bioethanol. This research aimed to reduce the lignin content and increase the cellulose content in coffee husk waste through chemical treatment with NaOH. The research stages involved placing 5 grams of coffee husk powder, sized at 80 mesh, into a glass beaker. Next, 50 ml of NaOH solution with concentrations of 5.0%, 5.5%, 6.0%, 6.5%, and 7.0% (v/v) was added. The sample was put in an autoclave at 121°C for 15, 30, 45, and 60 minutes. The best time was 30 minutes with an NaOH concentration of 7%, with the highest cellulose content obtained; it was 55%.
ANALYSIS OF ARABICA COFFEE CHARACTERISTICS AND DRYING METHOD ON ARABICA COFFEE FLAVOR USING ANALYSIS OF VARIANCE Sumitro, Martinus Robinson; Hutabarat, Julianus; Achmadi, Fuad
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 1 (2025): Journal of Sustainable Technology and Applied Science, May 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i1.9034

Abstract

This study investigated the effect of the coffee drying process using a coffee drying house on the moisture content, acidity, caffeine value, and flavour of Arabica coffee. An experimental method with a two-factor analysis of variance was used to evaluate significant differences between three different drying processes: Before Drying Process, Sun Drying Process, and Drying Process with Coffee Drying House. The results showed that sun-drying coffee with a coffee drying house produced lower moisture content, acidity, and caffeine value than the other drying processes. The flavour of Arabica coffee produced by this method was also considered sweeter by coffee export standards. Statistical analysis with Anova Block Subsampling, Anova 1 Factor Fixed Model, and Anova 2 Factor Factorial Design showed that the coffee drying process using coffee drying houses significantly affects the quality of arabica coffee. This study concludes that coffee drying houses can be an effective solution in improving the quality of Arabica coffee by controlling the moisture content, acidity, and caffeine value. The results of this study contribute to understanding the process of drying coffee beans and the factors that affect the final quality of the product. Therefore, this study provides an essential scientific basis for coffee farmers and the coffee processing industry to improve the quality of their coffee.
ANALYSIS OF THE IMPACT OF CIRATA FLOATING SOLAR POWER PLANT INTEGRATION ON THE VOLTAGE STABILITY OF THE 500 kV JAVA-BALI SYSTEM Abidin, Dimas Zainal; Krismanto, Awan Uji; Wartana, I Made
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 1 (2025): Journal of Sustainable Technology and Applied Science, May 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i1.13488

Abstract

This study analyses the impact of integrating a solar photovoltaic power plant (PLTS) on the voltage stability of the 500 kV Java-Bali transmission system, with a case study on the Cirata Floating Solar Power Plant. With the increasing use of renewable energy, particularly solar PV, it is crucial to understand how the integration of this variable energy source affects the reliability and stability of the power system. The Cirata Floating Solar Power Plant, the largest of its kind in Asia, has a capacity of 145 MW AC or equivalent to 192 MWp. However, integrating the Cirata Floating Solar Plant into the transmission system may potentially affect voltage stability, necessitating an in-depth analysis to assess its impact. The methodology employed in this study includes static voltage analysis through PV curve evaluation and dynamic voltage analysis to determine the system's capability to maintain or restore voltage within permissible stability limits. The study utilises DigSILENT PowerFactory software to simulate system conditions before and after the PLTS integration. The results indicate that the Cirata Floating Solar Plant’s power injection of 192 MWp improves voltage quality and enhances system stability compared to the pre-integration conditions.
CASE STUDY OF POWER SHARING CONTROLLER WITH THE USAGE OF DROOP CONTROL METHOD TO ANALYZE MANAGEMENT ENERGY SYSTEM IN ISLANDING MODE Nova Zainur Rifki; Irrine Budi Sulistiawati; Awan Uji Krismanto
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 1 (2025): Journal of Sustainable Technology and Applied Science, May 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i1.13513

Abstract

Microgrid as Renewable Energy in electricity is usually referred as Distributed Generation (DG). This research analyzes power sharing in a DC Microgrid using the droop control method in islanding mode, which is when the DC Microgrid operates separately from the main grid (PLN), and the load is fully supplied by DG. This Power Sharing Controller ensures that the power generated by each DG is in accordance with the system's requirements. This research uses Matlab Simulink software for its simulations. The DC Microgrid consists of three buck-boost converters connected in parallel. The power capacity and droop value of each buck-boost converter are adjusted according to the case. The test results showed that the determination of the droop value affects the power generated by the buck-boost converter. The smaller the droop value, the greater the power produced, and vice versa. Of the three cases simulated in the first case with an even load distribution on the buck-boost equal to a load increase of 1000w, there is an increase in power to 334 w and a current of 33.4 A, while in the second case with a load increase of 1000w, there is a power variation between 300-360 w and a current in the range of 3.6 to 30 amperes. While in case 3 a load increase of 1000 w buck-boost produces power at a value of 325-345w.
URBAN ORGANISATION AREA MITIGATION STRATEGY BASED ON ENVIRONMENTAL CARRYING CAPACITY IN THE BANYUWANGI SUB-DISTRICT Setiawati, Hendri; Hidayati, Agustina Nurul; Rusdiyanto, Edi
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 1 (2025): Journal of Sustainable Technology and Applied Science, May 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i1.11730

Abstract

Urban organisational areas are often influenced by economic activities that increase housing demand, both from the workforce and residents. This also occurs in Banyuwangi District, which serves as the Regional Activity Centre (PKW) with port, industrial, trade, and infrastructure activities. However, some areas, such as Karangrejo Village and Sobo Village, have slum organisational areas. This study aims to identify the mismatch of environmental carrying capacity in the organizational area of ​​Banyuwangi District and to develop mitigation strategies based on environmental carrying capacity. The methods used include environmental carrying capacity analysis, land uniformity, and SWOT analysis. The results indicate that the demographic carrying capacity in the area is low, particularly due to the air resource deficit in Kampung Melayu, Panderejo, and Temenggungan Villages. Kampungmelayu, Kertosari, and Sobo Villages also face similar problems related to organisational carrying capacity. The analysis reveals that 1% of the area is not permanently suitable, including sub-districts such as Kampungmandar, Karangrejo, and Kepatihan, while the remaining 5% of the area is currently unsuitable. Only 30% of the area is considered suitable for environmental carrying capacity. Then, to find out the strategy, a SWOT analysis was carried out, which can recommend a progressive strategy (growth-oriented strategy) that focuses on developing the trade, service, tourism, and cultural sectors based on environmental carrying capacity, as well as providing basic residential infrastructure and disaster mitigation training.
PURIFICATION OF FISH POND WASTEWATER FOR REUSE Wulandari, Lies Kurniawati; Mundra , I Wayan; Hardianto; Manaha, Yosimson Petrus
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 2 (2025): Journal of Sustainable Technology and Applied Science, November 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i2.11746

Abstract

This community service-based research is simply an effort to treat household wastewater to support the availability of clean water sources in urban areas. The type of waste treated here is graywater waste, which is wastewater that comes from kitchen and bathroom sinks or washing water (not feces and urine). The reason for choosing this type of graywater waste is because of its high production, which is up to 70-75% of the total liquid waste generated from domestic activities. The method used is a physical model in the laboratory using wastewater with a model scale that uses variations in discharge, number of vetiver stems, and residence time. The study's results indicated that the filter model improved wastewater quality, producing an output that met clean water standards. This demonstrates that using wastewater treatment filters with variations in water discharge, number of rods, and residence time effectively reduces pollutants in graywater.
OPTIMIZATION OF LIGHTING DESIGN IN OFFICE SPACES WITHIN THE FRAMEWORK OF ENERGY CONSERVATION Ainun Zakiyah; Lomi, Abraham; Handoko, Fourry
Journal of Sustainable Technology and Applied Science (JSTAS) Vol. 6 No. 2 (2025): Journal of Sustainable Technology and Applied Science, November 2025
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat, Institut Teknologi Nasional (ITN) Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36040/jstas.v6i2.9411

Abstract

Lighting conditions in office building B of UNISMA have not met the SNI standard because each room has the same number of lights for different rooms; this results in a large amount of electricity consumption from the lighting sector. The installation of the number of lamp armatures should be in accordance with the area of ​​the room and then related to the function of the room and must also meet the standard lighting of the room (SNI 03 – 6575 – 2011.2011). For that, the calculation of the number of lamp armatures is appropriate for the standard and design of room lighting using Dialux software, where the office lighting standard is 350 Lux. Based on these steps, the lighting standard is produced approaching the SNI standard using Philips LED lights. With this design condition, the use of electrical energy becomes optimum and energy efficiency is achieved. Based on the Dialux software simulation, the percentage of savings in the initial conditions and design was 39%:61%.

Page 6 of 6 | Total Record : 57

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