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All Journal RESWARA: Jurnal Riset Ilmu Teknik
Rahman, Siti Nur Aisyah
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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Performance Evaluation of Constructed Wetlands for Domestic Wastewater Treatment Hakim, Muhammad Irfan; Rahman, Siti Nur Aisyah
RESWARA: Jurnal Riset Ilmu Teknik Vol. 3 No. 1 (2025): RESWARA: Jurnal Riset Ilmu Teknik, January 2025
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v3i1.425

Abstract

Constructed wetlands (CWs) have emerged as an environmentally sustainable and cost-effective technology for domestic wastewater treatment, particularly in developing and tropical regions. This study aims to evaluate the performance of various constructed wetland configurations for domestic wastewater treatment based on a systematic synthesis of recent empirical studies. The research employed a structured literature analysis of peer-reviewed journal articles published between 2021 and 2025, focusing on pollutant removal efficiencies, system configurations, vegetation types, and operational conditions. The results indicate that constructed wetlands consistently achieve high removal efficiencies for organic matter and suspended solids, with reported reductions ranging from 70% to 95% for biochemical oxygen demand (BOD), 60% to 90% for chemical oxygen demand (COD), and 75% to 98% for total suspended solids (TSS). Vertical flow and hybrid constructed wetlands generally outperform horizontal subsurface flow systems, particularly in nitrogen and phosphorus removal. The integration of innovative elements such as biochar media, aeration, and microbial fuel cells further enhances treatment performance and pollutant degradation. This study confirms that constructed wetlands are a robust and adaptable solution for domestic wastewater treatment, offering significant environmental and socio-economic benefits. The findings support the wider implementation of constructed wetlands as a decentralized wastewater treatment strategy and highlight the importance of optimizing design parameters and plant selection for site-specific conditions.
Thermodynamic Analysis of Refrigeration Systems Using Eco-Friendly Refrigerants Rahman, Siti Nur Aisyah; Smith, Michael Jonathan
RESWARA: Jurnal Riset Ilmu Teknik Vol. 3 No. 4 (2025): RESWARA: Jurnal Riset Ilmu Teknik, October 2025
Publisher : Lembaga Penelitian dan Pendidikan (LPP) Kalibra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70716/reswara.v3i4.451

Abstract

The global transition toward environmentally sustainable refrigeration systems has intensified research on eco-friendly refrigerants with low global warming potential and zero ozone depletion potential. Conventional refrigerants such as R22 and R134a are increasingly restricted due to their adverse environmental impacts. This study presents a systematic thermodynamic analysis of refrigeration systems operating with eco-friendly refrigerants, based on an extensive synthesis of recent peer-reviewed literature. The research evaluates system performance using first and second law analyses, focusing on key indicators such as coefficient of performance, exergy efficiency, entropy generation, and environmental impact metrics. The methodological approach integrates comparative analysis across single-stage, cascade, and multi-evaporator refrigeration configurations employing hydrofluoroolefins, hydrocarbons, carbon dioxide blends, and emerging nano-refrigerants. The results indicate that refrigerants such as R290, R1234yf, R1234ze, and R744-based mixtures consistently demonstrate superior energy and exergy performance compared to conventional fluids. Cascade and multi-stage systems further enhance performance under ultra-low temperature applications. The study confirms that eco-friendly refrigerants can achieve both thermodynamic efficiency and environmental sustainability. These findings provide a robust scientific basis for refrigerant selection and system design in future refrigeration and air-conditioning applications.
Co-Authors Hakim, Muhammad Irfan Smith, Michael Jonathan