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All Journal RESWARA: Jurnal Riset Ilmu Teknik Journal of Engineering and Technological Science
Nakamura, Kenji
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Effect of Wastewater Treatment Efficiency on River Ecosystem Sustainability Kartikasari, Rina; Rodriguez, Maria L.; Nakamura, Kenji
RESWARA: Jurnal Riset Ilmu Teknik Vol. 2 No. 2 (2024): RESWARA: Jurnal Riset Ilmu Teknik, April 2024
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v2i2.392

Abstract

Wastewater treatment plants (WWTPs) play a crucial role in controlling pollutant discharges into river systems, thereby influencing river ecosystem sustainability. However, increasing evidence suggests that conventional and even advanced wastewater treatment processes may not fully mitigate ecological impacts on receiving waters. This study aims to synthesize and critically analyze global scientific evidence on the effects of wastewater treatment efficiency on river ecosystem sustainability, focusing on physicochemical, biological, and metabolic responses. A systematic literature-based research design was employed, analyzing 30 peer-reviewed journal articles, conference proceedings, and preprints published between 2016 and 2024. The reviewed studies reveal that enhanced wastewater treatment efficiency significantly improves water quality, reduces nutrient and micropollutant loads, stabilizes ecosystem metabolism, and supports biodiversity recovery. Nevertheless, residual contaminants, altered flow regimes, and nutrient imbalances persist, leading to changes in microbial communities, food web dynamics, and fish assemblages. The findings indicate that while improved wastewater treatment is essential for achieving river sustainability, current treatment targets remain insufficient in many regions. This study highlights the need for integrated wastewater management strategies that combine advanced treatment technologies, ecological flow considerations, and watershed-scale planning to ensure long-term river ecosystem resilience.
Analysis of Electrical Power Quality in the 20 kV Distribution Network in the Cikarang Industrial Area Ariadi, Rizky Pratama; Papadopoulou, Maria Eleni; Nakamura, Kenji
Journal of Engineering and Technological Science Vol. 2 No. 1 (2026): Journal of Engineering and Technological Science, February 2026
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/jets.v2i1.221

Abstract

Industrial areas demand stable and high quality electrical power to support continuous production processes. The Cikarang Industrial Area is one of the largest industrial zones in Indonesia and relies heavily on a 20 kV medium voltage distribution network. However, increasing nonlinear loads, load imbalance, and network expansion have raised concerns related to power quality issues. This study aims to analyze electrical power quality in the 20 kV distribution network serving the Cikarang Industrial Area. The research applies a quantitative case study approach using field measurements, load flow analysis, and harmonic evaluation based on IEEE standards. Data were collected from selected feeders supplying industrial customers and analyzed using ETAP software. The results show that voltage drop values range from 1.8 percent to 5.2 percent during peak load conditions, while total harmonic distortion of current exceeds recommended limits in several feeders. Load imbalance also contributes significantly to increased power losses. These findings are consistent with previous studies on Indonesian medium voltage networks. The study concludes that power quality in the Cikarang Industrial Area requires systematic monitoring and corrective measures, including load balancing, reactive power compensation, and harmonic mitigation. The results provide practical insights for utilities and industrial consumers to improve network reliability and efficiency.
Co-Authors Ariadi, Rizky Pratama Papadopoulou, Maria Eleni Rina Kartikasari, Rina Rodriguez, Maria L.