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Leuser Journal of Environmental Studies
Published by PT. Heca Sentra Analitika
ISSN : -     EISSN : 29887038     DOI : https://doi.org/10.60084/ljes
Core Subject : Science, Education, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Energy Environmental Science Other
Leuser Journal of Environmental Studies is a distinguished international, peer-reviewed scientific journal dedicated to advancing knowledge in the field of environmental studies. LJES aims to provide a platform for researchers, practitioners, and academics to publish their high-quality original research articles, review articles, and case reports related to various aspects of the environment. The journal overarching goal is to foster interdisciplinary research that connects scientific and technological advancements to real-world applications, with a specific emphasis on the impact they have on society and the environment. The scope of LJES encompasses a wide range of topics within the field of environmental studies, including but not limited to: environmental science, biodiversity and conservation, climate change and sustainability, environmental policy and governance, environmental impact assessment, pollution and remediation, environmental health, ecological modeling, sustainable resource management, environmental education and communication
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ilmu Lingkungan (Lain-Lain)
Articles 40 Documents
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Sustainable Biohydrogen Production from Palm Oil Mill Effluent: Effect of Hydraulic Retention Time in a Hybrid Anaerobic System Adrianto Ahmad; Evelyn Evelyn; David Andrio; Dini Avriliani; M. Dalil; Amir Hamzah
Leuser Journal of Environmental Studies Vol. 4 No. 1 (2026): April 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i1.379

Abstract

Currently, the world is facing two crises: a shortage of fossil fuels and global climate change. Climate change is linked to increased environmental damage from fossil fuel use and the effects of greenhouse gases. Therefore, it is important to achieve breakthroughs to develop alternative energy sources that can replace fossil fuels. One of these is biohydrogen, which plays an important role in future energy because it is environmentally friendly, renewable, and sustainable. In addition, Indonesia is the world's largest producer of palm oil, which naturally generates liquid waste. Using palm oil mill liquid waste to produce biohydrogen via an anaerobic hybrid bioreactor during the acidogenesis phase is the best solution to address environmental impacts while simultaneously providing a clean energy source. This research aims to produce biohydrogen from palm oil mill liquid waste. This was done using an anaerobic hybrid bioreactor during the acidogenesis phase, with hydraulic retention times of 6, 12, and 18 hours. The research results show that the best hydraulic retention time is 18 hours, with a VSS removal efficiency of 98% and biogas production of 5.0 L/day, yielding 64% biohydrogen.
A Bibliometric and Quantitative Review of Renewable Energy–Powered Mine Dewatering Systems: Trends, Performance, and Gaps Miftahul Fadillah; Erkata Yandri
Leuser Journal of Environmental Studies Vol. 4 No. 1 (2026): April 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i1.388

Abstract

Renewable energy integration into mine dewatering systems has gained increasing attention amid rising energy costs, decarbonization pressures, and hydrological variability in mining operations. However, existing studies remain fragmented across hydrogeological modeling, hybrid energy optimization, and environmental assessment, limiting cross-study comparability and system-level integration. This study conducts a structured bibliometric and quantitative synthesis to examine the evolution of research, collaboration patterns, thematic concentration, and methodological gaps in renewable energy–based mine dewatering systems between 2015 and 2025. A PRISMA-based dataset of 43 eligible publications was analyzed using co-authorship networks, keyword co-occurrence mapping, temporal overlay visualization, and composite bibliometric scoring. The results reveal a transition from hydrogeology-focused research toward hybrid renewable integration and energy storage–oriented systems. Publication activity increases significantly after 2020, with a peak in citation impact around that time. Energy storage, renewable integration, and groundwater management emerge as dominant research hotspots, while system-level optimization, stochastic hydrological modeling, real-time control, and long-term validation remain underdeveloped. Quantitative evidence indicates energy savings of approximately 12–25% and carbon emission reductions of 20–40%, although these remain constrained by heterogeneous baselines and deterministic modeling approaches. This study proposes a conceptual analytical framework integrating bibliometric structural analysis, temporal performance evaluation, and gap-driven synthesis to support uncertainty-aware and system-level evaluation of renewable-based mine dewatering systems. The findings guide scalable, integrated dewatering strategies across diverse mining contexts.
Patterns of Termite Diversity and Their Ecological Associations with Dipterocarpaceae in the Soraya Research Station, Leuser Ecosystem, Indonesia Iqbar Iqbar; Djufri Djufri; Syaukani Syaukani; Darusman Darusman
Leuser Journal of Environmental Studies Vol. 4 No. 1 (2026): April 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i1.397

Abstract

This study aimed to assess termite diversity and habitat distribution at the Soraya Research Station (SRS), analyze ecological associations between termite species and Dipterocarpaceae, and identify key interaction types and their ecological roles in forest succession. Termite sampling was conducted using a standardized belt transect method across 50 subplots (0.5 ha). A total of 48 termite species from 2 families and 17 genera were recorded, with Termitidae (43 species) being the dominant family. Termite distribution was strongly associated with decomposing substrates, particularly fallen logs, while living trees showed high resistance to colonization. Despite the dominance of Dipterocarpaceae, only 10.4% of termite taxa interacted directly with these trees, and 92,1% of examined Dipterocarpaceae structures showed no active colonization. Specific interactions identified included neutral associations (Hospitalitermes hospitalis), opportunistic pest (Nasutitermes roboratus), and specialized decomposers (Coptotermes curvignathus, Macrotermes malaccensis, and Pericapritermes samarangi). The high termite diversity indicates significant ecological recovery at SRS. Termite-host interactions are primarily governed by substrate quality and decomposition stages rather than host identity, highlighting the effective structural and chemical defenses of living Dipterocarpaceae in secondary tropical forests.
Development of a Scoring-Based Renewable Energy Readiness Index for Commercial Buildings: An Integrated Framework Based on Energy Audit Findings Andry Riyanto; Erkata Yandri
Leuser Journal of Environmental Studies Vol. 4 No. 1 (2026): April 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i1.405

Abstract

The building sector plays a significant role in global energy consumption and carbon emissions, necessitating the integration of renewable energy systems. However, conventional energy audits primarily focus on technical efficiency and do not provide a structured assessment of a building’s readiness for renewable energy implementation. This study addresses this gap by developing a Renewable Energy Readiness Assessment Framework (RERAF) and its corresponding Renewable Energy Readiness Index (RERI), which integrate energy audit findings with multidimensional readiness factors. The framework comprises nine dimensions—technical, managerial, economic, regulatory, environmental, social, digital, resilience, and institutional—operationalized through an evidence-based scoring approach using a standardized Likert scale (0–4). To maintain methodological neutrality at the initial development stage, all dimensions and indicators are assigned equal weights (equal weighting scheme), thereby avoiding subjective bias in the absence of expert-based validation. The framework was applied to a commercial office building in Indonesia using energy audit data, supporting documents, and operational information. The results show a RERI score of 2.39 (equivalent to 60.00 on a normalized scale), indicating a moderate level of readiness. The analysis reveals a structural imbalance between relatively strong technical readiness and weaker non-technical dimensions, particularly in managerial, economic, digital, and institutional aspects. These findings highlight that technical feasibility alone is insufficient to ensure successful renewable energy adoption. The proposed framework contributes to bridging the gap between energy audit practices and renewable energy readiness assessment by providing a transparent, evidence-based, and reproducible decision-support tool for stakeholders in the building sector.
From Control to Coexistence: Reframing Integrated Pest Management under Climate and Environmental Change Qalbin Salim Fazli; Haikal Azis; Mussa Isaack Delya; Erick Hironimus Kihwili; Ghalieb Mutig Idroes; Ghazi Mauer Idroes
Leuser Journal of Environmental Studies Vol. 4 No. 1 (2026): April 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i1.409

Abstract

This study examines the evolution of research on integrated pest management (IPM) in relation to climate change and environmental impacts through a bibliometric analysis of Scopus-indexed publications from 2003 to 2026. By integrating publication trends, collaboration networks, keyword co-occurrence, and conceptual structure mapping, the study identifies a significant post-2019 expansion reflecting increasing global urgency toward sustainable agriculture. The findings reveal a structural shift from pesticide-dependent approaches to ecologically based and climate-adaptive strategies, with growing integration of biodiversity, ecosystem services, and agroecology within IPM frameworks. Conceptual analysis further indicates that IPM functions as a transitional bridge between conventional and sustainability-oriented paradigms. Despite expanding international collaboration, research contributions remain geographically concentrated, highlighting a mismatch between knowledge production and vulnerability to climate-driven pest risks. The study underscores an ongoing paradigm transition and emphasizes the need for inclusive, context-specific, and climate-resilient IPM strategies.
Asymmetric Effects of Human Rights on Renewable Energy Consumption Irsan Hardi; Mustafa Necati Coban; Naftaly Mose; Suriani Suriani; M. Shabri Abd Majid
Leuser Journal of Environmental Studies Vol. 4 No. 2 (2026): October 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i2.415

Abstract

As the transition to renewable energy has become increasingly important for achieving environmental sustainability, understanding the institutional factors that influence renewable energy consumption (REC) is crucial. This study examines the relationship between human rights and REC using a panel dataset covering five world regions (Africa, Asia, Europe, North America, and South America) from 1990 to 2024. Employing an asymmetric panel ARDL and the Dumitrescu–Hurlin panel causality test, the results reveal a significant long-run nonlinear relationship in which improvements in human rights increase REC, while deteriorations in human rights reduce REC. Short-run effects vary across regions, reflecting differences in institutional and developmental conditions. The causality analysis indicates a bidirectional relationship between human rights and renewable energy consumption. These findings suggest that strengthening human rights institutions can promote renewable energy adoption, support environmental sustainability, and facilitate the transition toward a cleaner energy system.
The Nexus between Hydropower Energy and Environmental Quality: Evidence from Granger Causality and Wavelet Coherence Iin Shabrina Hilal; Ghalieb Mutig Idroes
Leuser Journal of Environmental Studies Vol. 4 No. 2 (2026): October 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i2.403

Abstract

This study examines the relationship between hydropower energy and environmental quality in Indonesia over the period 1965–2024 using Granger causality and wavelet coherence approaches. Environmental quality is proxied by ecological footprint (EFP), greenhouse gas emissions (GHG), and carbon dioxide emissions (CO2). The findings reveal that unidirectional causality runs from EFP and CO2 to hydropower. In contrast, bidirectional causality is observed between hydropower and GHG. Furthermore, the wavelet coherence results show that these relationships are time-varying and frequency-dependent, broadly supporting the Granger causality findings while revealing how they evolve across different time horizons. Overall, the findings indicate that hydropower development in Indonesia is primarily driven by ecological footprint and carbon emissions, while its relationship with GHG emissions is characterized by mutual interaction, highlighting a differentiated and time-varying linkage across environmental indicators. This suggests that hydropower planning should be more closely aligned with environmental trends rather than treated as an independent driver of environmental improvement.
Assessment of Arsenic and Mercury Contamination in Water and Sediments Around the Jaboi Sabang Geothermal Area Using ICP-OES Fazri Baziahni; Rinaldi Idroes; Lelifajri Lelifajri
Leuser Journal of Environmental Studies Vol. 4 No. 2 (2026): October 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i2.441

Abstract

The Jaboi Sabang Geothermal Area in Aceh, Indonesia, comprises four active craters that release geothermal fluids and gases into surrounding water sources used by local communities for daily activities. Despite the known toxicity of arsenic (As) and mercury (Hg) in geothermal environments, baseline data on their occurrence and distribution in local water and sediment remain limited. This study assessed As and Hg contamination in water and sediment samples using Inductively Coupled Plasma–Optical Emission Spectrometry (ICP-OES). Water samples were collected from hot springs, bathing pools, rivers, boreholes, dug wells, and treated water, while sediment samples were obtained from craters and stream beds. Method validation showed good linearity (R² > 0.99), with limits of detection (LoD) of 10.49 µg/L for As and 1.98 µg/L for Hg, and acceptable recovery values (70–125%). The highest As and Hg instrument responses in water were observed in hot-spring sample J1, at 11.268 and 6.861 µg/L, respectively. However, the As result for J1 was above the LoD but below the limit of quantification (LoQ), indicating detection without reliable quantification, while As in J2–J7 was below the LoD. For Hg, only J1 exceeded the LoQ, whereas J3 and J6 produced responses between the LoD and LoQ. The remaining samples were below the Hg LoD. Because the applicable Hg benchmark was lower than the method LoD, compliance could not be established for samples other than J1. These findings highlight the need for improved analytical sensitivity and continued monitoring to assess potential environmental and public health risks.
Adaptive Solar–Electrolysis Architecture for Decentralized Energy Applications: A Preliminary Engineering Assessment Ahmad Fachrurrozi; Erkata Yandri; Agus Rendi Wijaya; Marzuirman Marzuirman; Ramadhan Farhan Fadillah; Derry Pradana Nasrul; Ahmad Zulfikri Taning; Aep Saepul Uyun
Leuser Journal of Environmental Studies Vol. 4 No. 2 (2026): October 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i2.447

Abstract

The intermittency of renewable electricity presents a significant challenge for decentralized energy systems in which electrolysis is coupled to variable photovoltaic (PV) generation. This study develops a conceptual adaptive solar–electrolysis architecture for decentralized energy applications by integrating photovoltaic generation, adaptive energy management, battery buffering, wet-cell electrolysis, hydrogen-rich gas handling, safety provisions, and a potential household utilization pathway within a unified system framework. The study uses a conceptual engineering approach and does not include experimental or field measurements; it comprises functional requirement analysis, system architecture development, energy-flow formulation, adaptive operating logic, representative renewable-energy scenarios, functional comparison, and preliminary engineering assessment. Four study-specific conceptual indicators provide a structured basis for future quantitative evaluation: the Adaptive Energy Stability Index (AESI), Electrolysis Continuity Index (ECI), Renewable Adaptation Factor (RAF), and Integrated System Reliability Index (ISRI). These indicators are defined as conceptual assessment frameworks rather than established reliability standards or experimentally validated performance measures. The conceptual analysis formulates adaptive power coordination and finite battery buffering as a mechanism for managing short-term mismatches between photovoltaic generation and electrolysis demand. However, the proposed architecture cannot eliminate the effects of prolonged renewable-energy deficits because battery capacity is finite. Furthermore, when hydrogen and oxygen are not separately collected, the gas pathway considered in this study represents an H₂–O₂/HHO-type gas stream rather than experimentally verified pure hydrogen. Its actual composition, production rate, combustion behavior, and safety characteristics therefore require experimental characterization. The study establishes a preliminary system-level engineering framework for subsequent dynamic modelling, prototype development, quantitative performance assessment, safety validation, techno-economic analysis, and lifecycle environmental evaluation.
Context-Dependent Effects of PEG Grade on Lignocellulose Fractionation with Deep Eutectic Solvents Agnes Amelia Tanjung; Julinawati Julinawati; Widya Fatriasari; Zuchra Helwani; Andriy Anta Kacaribu; Rinaldi Idroes
Leuser Journal of Environmental Studies Vol. 4 No. 2 (2026): October 2026
Publisher : Heca Sentra Analitika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60084/ljes.v4i2.457

Abstract

This structured critical review evaluated how nominal polyethylene glycol (PEG) grade affects lignocellulose fractionation in deep eutectic solvents using an auditable corpus of 42 retained studies, including three within-study PEG-grade series. The eucalyptus studies showed modest PEG400 advantages for selected responses, whereas a sugarcane-bagasse screen gave the highest lignin removal (83.23%), glucose concentration, and glucose yield at PEG600, with lower cellulose retention than at PEG200/400; multivariable optimization subsequently selected PEG400. These contrasts show that nominal grade is a formulation variable rather than an isolated molecular-weight effect: equal PEG mass changes chain and terminal-hydroxyl concentrations, whereas a fixed choline chloride:PEG molar ratio also changes polymer mass and repeat-unit content. Candidate explanations are organized into four pathways—interaction-network modification; viscosity, diffusion, and steric trade-offs; phase behavior and partitioning; and lignin stabilization/carbohydrate protection. Current evidence supports formulation-dependent grade responses but not a universal grade ranking or numerical optimum. MW-REPORT is proposed to standardize grade characterization, normalization, mediator measurements, and product balances needed for reproducible formulation-specific selection.

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