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INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 292 Documents
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Optimization of Singkarak hydropower outflow for renewable micro hydropower development Rosnita Rauf; Harry Setya Hadi; Hazlif Najif
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.95116

Abstract

The government's initiative to enhance energy resilience and independence includes the augmented use of green energy. PLTA Singkarak is a renewable energy facility that harnesses water from Lake Singkarak to operate its turbines, featuring an average tailrace discharge of 30 m³/s. The Singkarak Hydroelectric Power Plant receives its energy from PLN's Singkarak Substation, utilizing a 5 MVA transformer for distribution to meet its own consumption needs. Consequently, each month, the Singkarak Hydroelectric Power Plant must reduce its total kWh output by its own use, averaging 4,127.8 kW each day. A small-scale Micro Hydro power plant will be developed to utilize the potential water source at the outflow of the Singakrak Hydroelectric Power Plant, serving as the primary supply for the facility, and so decreasing the company's performance target for its own consumption. A sufficiently big outflow tailrace discharge is likely to be repurposed for a micro-hydropower plant. The initial elevation of the Singkarak Hydroelectric Power Plant tailrace exit is 71 meters above sea level, whereas the end elevation is 67 meters above sea level, as measured by hand. A micro-hydropower plant (PLTMH) can be engineered with a net head of 3.8 m and a flow rate of 10.618 m³/s, yielding a maximum power output of 327.8 kW. The turbine employed is a Kaplan turbine, while the generator utilized is a 3-phase synchronous generator, with both components functioning at 1000 rpm . This PLTMH design can supplant the self-consumption of the Singkarak hydropower plant (PLTA), hence enhancing the system's energy efficiency.
Effect of soaking Allium sativum peel waste on microbial contamination of salted anchovy rice and analysis of its total phenolic content Iramie Duma Kencana Irianto; Amelia Handayani Burhan; Afifah Astuti
Jurnal Penelitian Saintek Vol 31, No 1 (2026)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v30i1.55677

Abstract

Approximately 84% of salted anchovy rice fish sold in traditional markets in Yogyakarta still contain formaldehyde, a hazardous substance that may cause adverse health effects ranging from throat irritation to cancer. Saponin compounds contained in Allium sativum peel waste have been reported to reduce formaldehyde levels in salted anchovy rice fish by up to 89.12%; however, the reduction of formaldehyde may increase microbial contamination. This study aimed to examine microbial contamination in salted anchovy rice fish after immersion treatment using A. sativum peel waste. Qualitative analysis of saponins was conducted using the Froth test and Thin Layer Chromatography (TLC), while phenolic compounds were analyzed qualitatively using TLC and quantitatively using spectrophotometric methods. Microbial contamination was evaluated using the Total Plate Count (TPC) method. The results demonstrated that A. sativum peel waste contained saponin and phenolic compounds, with an average phenolic content of 8.57 ppm. Furthermore, 1 g of A. sativum peel waste reduced microbial contamination in salted anchovy rice fish by up to 10,000-fold. The microbial contamination level showed a TPC value of 8.55 × 10³ colonies/g, indicating that the product remained within the safe consumption limit of less than 1 × 10⁵ colonies/g.

Page 30 of 30 | Total Record : 292

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