cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Abdi Hanra Sebayang
Contact Email
siestjournal@gmail.com
Phone
+6281374892141
Journal Mail Official
siestjournal@gmail.com
Editorial Address
Jl. Almamater No.1, Padang Bulan, Medan Baru, Medan City, North Sumatra 20155, Medan, Provinsi Sumatera Utara, 20155
Location
Kota medan,
Sumatera utara
INDONESIA
Sustainable in Energy Science and Technology
Published by Politeknik Negeri Medan
ISSN : -     EISSN : 31095909     DOI : https://doi.org/10.51510/siest
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics
Sustainable in Energy and Science Technology (SiEST) aims to serve as a multidisciplinary platform for the dissemination of cutting-edge research, innovation, and advancements in the fields of sustainable energy, environmental science, and technological artificial intelligent development. The journal seeks to address global challenges related to energy systems, environmental sustainability, and the integration of science engineering and modelling technologies to promote a sustainable future. The journal publishes high-quality and high-impact Original Research Articles, Review Articles and Short Communication Articles on cutting-edge innovations in research, and recent advances or issues of interest to the energy and science technology community. Sustainable in Energy and Science Technology Scope: 1. Sustainable Energy Systems 2. Applied Engineering and Environmental 3. Physical Sciences 4. Chemical Sciences 5. Engineering Technological Advancements
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 5 Documents
 1 
Second-Generation Bioethanol Production Using Hydrolytic Treatment of Durian Seed Aulia Djati Pramiesta; H.C. Theofany; Naurah Rizki Fajrini; H.B. Aditiya; Teuku Meurah Indra Riayatsyah
Sustainable in Energy Science and Technology Vol. 1 No. 1 (2025): Sustainable in Energy and Science Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v1i1.2573

Abstract

Second-generation bioethanol produced from non-edible feedstocks and agricultural waste is a promising alternative to fossil fuels. In this study, durian (Durio zibethinus) seeds – an abundant fruit waste in Indonesia (over 1.14 million tons of durian fruit produced in 2018) – were utilized as a starch-rich feedstock for bioethanol. A microwave-assisted alkaline hydrolysis method was applied and optimized to release fermentable sugars for subsequent bioethanol production. A Box–Behnken experimental design was used to examine the effects of four parameters: NaOH concentration (0.5–1.0 M), durian seed loading (2–4 g/100 mL), microwave irradiation time (2–4 min), and microwave power (200–400 W). Reducing sugar yield (glucose equivalent) was quantified by the dinitrosalicylic acid (DNS) method. The maximum reducing sugar concentration achieved was 2.256 g/L, corresponding to a theoretical ethanol yield of approximately 1.305 g/L. The optimum condition was observed at 4 g durian seed loading, 1 M NaOH, 400 W microwave power, and 4 min irradiation. Regression analysis indicated that microwave power and time had the most significant positive effects on sugar yield, while substrate loading had a moderate effect and alkali concentration the least. These results demonstrate the viability of durian seed waste as a feedstock for bioethanol and provide an optimized set of hydrolysis conditions. However, due to experimental constraints, fermentation of the hydrolysate was not performed; instead, theoretical ethanol yield was calculated. Future work should integrate an actual fermentation step to confirm ethanol production.
Techno-Economic Study of Biodiesel Generation from Sterculia foetida Seeds Bilqist Imeilia Az Zahra; H.C. Theofany; Teuku Meurah Indra Riayatsyah; H.B. Aditiya; Bidattul S Zainal
Sustainable in Energy Science and Technology Vol. 1 No. 1 (2025): Sustainable in Energy and Science Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v1i1.2574

Abstract

As fossil fuel reserves diminish and energy demand grows, biodiesel from non-edible oils has emerged as a promising renewable alternative. This study evaluates the feasibility of producing biodiesel from Sterculia foetida (Java olive) seeds, which contain 50–60 % oil. A second-generation biodiesel plant is designed and simulated using SuperPro Designer, covering oil extraction, transesterification, product purification, and by-product recovery. The plant processes 4,396 kg of seeds per hour in Lombok (Indonesia). Material and energy balances indicate nearly complete conversion to biodiesel, yielding ~16.19 million kg/year with a 0.001 % mass balance error. The total utility power demand is 6.2 million kWh/year, with the transesterification reactor consuming ~27 %. Economic evaluation (2021 USD) shows a capital investment of ~$3.82 million and annual operating cost of ~$20.72 million. At a biodiesel price of $1.00/L, annual revenue is ~$21.47 million, including ~$2.4 million from glycerol and co-products. Profitability metrics are positive: gross margin 3.48 %, ROI 19.67 %, payback period 5.08 years, IRR 9.14 %, and NPV ~$1.03 million. Sensitivity analysis shows profitability is most affected by biodiesel market price and feedstock cost. Overall, biodiesel production from Sterculia foetida is technically feasible and economically viable, diversifying Indonesia’s biodiesel feedstocks.
Mechanical Characterization of Crispness in Dry Foods via Multi Specimen Compression Testing Dara Ginanti; Kushendarsyah Saptaji; Sri Hastuty; Farid Triawan
Sustainable in Energy Science and Technology Vol. 1 No. 1 (2025): Sustainable in Energy and Science Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v1i1.2575

Abstract

Texture is a critical quality attribute of dry snack foods, with crispness being especially important for consumer enjoyment. However, crispness is often judged subjectively by sensory evaluation, leading to ambiguity and inconsistency. This study develops a quantitative mechanical method to characterize crispness in dry foods using a multi-specimen uniaxial compression test that simulates human biting. Cassava chips (at three slice thicknesses) and a traditional dried Sus cake were tested in batches within a custom container under identical conditions. Statistical analysis (ANOVA) confirmed that these parameters notably differentiate samples (at P < 0.20 level) and correlate with sensory crispness rankings. The thinnest cassava chips (1 mm) exhibited the highest crispness (lowest energy and slope, highest jaggedness), whereas thicker chips were less crisp. Notably, the dried Sus cake, despite its different origin, showed higher crispness metrics than even the thinnest cassava chips, aligning with sensory perception. These results demonstrate that the proposed multi-specimen compression test can quantitatively distinguish crispness levels in foods of irregular shape. This study offers a qualitative data of crispiness on multi-specimen basis for specimen with random shapes by using the uniaxial compression test with two parallel plates. The key variables taken into account are the strain energy, mean slope of the stress-strain curve, and the jaggedness of the load-displacement curve.
Literature Review: Computational Methods for Designing Thermostable, Efficient, and Cost-Effective Enzymes for Industrial Applications Prisca Caesa Moneteringtyas; Nahzim Rahmat; Inten Pangestika; Sri Rahayu Widya Ningrum; Annisa Fillaeli; Aliyah Aliyah
Sustainable in Energy Science and Technology Vol. 1 No. 1 (2025): Sustainable in Energy and Science Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v1i1.2578

Abstract

Enzymes play a vital role as biocatalysts in various industrial applications due to their high specificity and efficiency under mild conditions. However, their limited thermostability significantly constrains their operational lifespan and effectiveness at elevated temperatures. This review examines recent advancements in computational methods aimed at enhancing enzyme thermostability, focusing on structure-based rational design, machine learning, and hybrid approaches. Key findings highlight the effectiveness of structure-based methods, in optimizing enzyme structures, while machine learning approaches demonstrated potential in predicting stabilizing mutations. This review identifies key research gaps and proposes directions for future studies to facilitate the industrial adoption of thermostable enzymes.
Modified Zeolite-Based Composite as Urea Slow-Release Fertilizer – A Mini Review Siti Mahmudha; Taranipa Marfitania; Muhammad Idris; Sulwiyatul Kamariyah Sani; Pina Budiarti Pratiwi; Eko Pujiyulianto
Sustainable in Energy Science and Technology Vol. 1 No. 1 (2025): Sustainable in Energy and Science Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v1i1.2579

Abstract

Urea is the most commonly used nitrogen fertilizer in agriculture due to its high nitrogen content and low cost. However, its efficiency is often below 50% because of nitrogen losses through leaching, volatilization, and surface runoff. To reduce these losses and improve fertilizer efficiency, slow-release fertilizers (SRFs) using modified zeolite-based composites have been developed. Zeolite is a porous aluminosilicate mineral with excellent ion exchange and adsorption properties, making it a good carrier for urea. However, natural zeolite has limitations, such as impurities and low surface area, which can be improved through modification techniques like acid–base treatments (dealumination and desilication), surfactant modification, and combination with organic or inorganic materials. These modifications improve pore size, surface area, and nutrient-holding capacity, allowing for a slower and more controlled release of nitrogen. This mini review discusses recent studies on the preparation, characterization, and performance of modified zeolite composites for urea delivery, showing their potential to reduce environmental impact and increase nutrient use efficiency in agriculture.

Page 1 of 1 | Total Record : 5

 1 

Filter by Year

2025 2025


Reset
Filter By Issues
All Issue Vol. 1 No. 1 (2025): Sustainable in Energy and Science Technology