JURNAL KESEHATAN LINGKUNGAN: Jurnal dan Aplikasi Teknik Kesehatan Lingkungan

Development Of Mist Maker Technology For Acid Mine Drainage Treatment In The Coal Industry

Muhammad Isra Ahdyannor — 2026-07-31

Acid mine drainage (AMD) is a critical environmental issue associated with low pH and elevated concentrations of dissolved metals, particularly iron (Fe), which can threaten aquatic ecosystems and surrounding communities. This study evaluated the effectiveness of a mist maker combined with lime for improving pH and reducing Fe concentration in AMD. An experimental pre-test and post-test design was applied using three treatment systems: mist maker aeration, lime neutralization, and a combined mist maker–lime treatment. Each experiment used 5 L of AMD, a 30-minute contact time, and three replications. The measured parameters were pH and Fe concentration, while data were analyzed descriptively and inferentially using a paired t-test. The combined mist maker–lime treatment showed the highest performance. It increased pH by 2.32 ± 0.21, from 3.59 ± 0.21 to 5.91 ± 0.03, and reduced Fe concentration by 2.03 ± 0.61 mg/L, corresponding to a removal efficiency of 94.4%. These improvements were statistically significant (p < 0.05). Lime treatment alone significantly increased pH by 1.81 ± 0.04 (p < 0.05), but its Fe reduction of 0.64 ± 0.57 mg/L was not statistically significant (p > 0.05). In contrast, mist maker treatment alone produced no significant change in pH or Fe concentration. These findings indicate that integrating mist maker aeration with lime neutralization enhances AMD treatment through synergistic aeration, pH adjustment, oxidation, and metal precipitation mechanisms. Therefore, this combined approach offers a rapid, effective, and practical alternative for Fe removal and AMD neutralization under short contact conditions in small scale practical treatment applications.

Application of Hazard Identification, Risk Assessment, and Control (HIRAC) in Academic Office Workspaces

Yosef Barita Sar Manik — 2026-07-31

Occupational Health and Safety (OHS) is essential for creating a safe, healthy, and productive work environment, including academic offices. However, occupational safety and health (OSH) practices in higher education administrative workplaces remain limited, and workplace hazards are often underestimated. This study aimed to identify workplace hazards, assess occupational risks, and propose appropriate control measures in the faculty cubicle area at President University using the Hazard Identification, Risk Assessment, and Control (HIRAC) method. A descriptive observational design was applied following ISO 45001:2018. Data were collected through direct observation and documentation, and risk levels were determined using a likelihood–severity matrix. The assessment identified 21 hazard scenarios involving safety, physical, ergonomic, biological, and psychosocial hazards. Electrical hazards, particularly damaged outlets and excessive use of extension cords, presented the highest risk (risk value = 16) because of their potential to cause electric shock, short circuits, and fire. Other notable hazards included damaged chairs, cluttered workspaces, improper fire extinguisher placement, and inadequate ventilation. Control measures developed according to the hierarchy of controls reduced the average calculated risk value from 9.0 to 3.3, indicating improved workplace risk management. These findings demonstrate that HIRAC provides a practical and systematic approach for identifying workplace hazards, prioritizing risks, and supporting effective risk control in academic office environments. The study was limited to a single workspace and a relatively short observation period.

Determination of Alkalinity and Chloride in Well Water Before and After Purification Using Titration Method

Irja Sepriyanyo Jenmau — 2026-07-31

This study aims to determine the levels of alkalinity and chloride in well water before and after the purification process in Kampung Jaifuri, Skanto District, Keerom Regency. Well water is the primary water source for the local community; therefore, its quality needs to be evaluated to ensure its suitability for daily use. The parameters analyzed in this study were alkalinity and chloride levels as important indicators of water chemical quality. The method used in this research was titration. Alkalinity was determined using acid-base titration with phenolphthalein and methyl orange indicators, while chloride levels were measured using argentometric titration (Mohr method). Water samples were collected before and after the purification process to compare their quality. The results showed that alkalinity decreased from 2.64 mg/L to 2.28 mg/L after purification. Similarly, chloride levels decreased from 7.81 mg/L to 6.39 mg/L. These results indicate that the purification process was effective in improving water quality by reducing the concentration of chemical substances in the well water. In conclusion, the water purification process is effective in reducing alkalinity and chloride levels, thereby improving the quality of well water in Kampung Jaifuri. It is recommended that the community apply water purification methods before using well water for daily needs.

Integrated Indoor Air Quality Protocol for an Additive Manufacturing Workshop: Case Study of FabLab President University

Azka Leona Mayriza — 2026-07-31

The indoor air quality (IAQ) issues in 3D Printing Workshop arise from high equipment usage, material handling, and continuous student presence. 3D printing process generates pollutants that may threaten health and safety. Due to Indonesia's currently lacks a specific national standard for IAQ specifically in 3D Printing Workshop, creating a regulatory gap for these educational facilities. This study conducted a regulatory inventory to identify applicable standards for IAQ in the 3D Printing Workshop at President University. Two national regulations were included as part of this inventory: Permenkes No. 2 Tahun 2023 and Permenaker No. 5 Tahun 2018 as primary sources. Regulations were selected based on legal authority, parameter coverage, relevance to workshop activities, and strictness of threshold limits to support a comprehensive and health-protective assessment approach. Eight key IAQ parameters were identified: temperature, relative humidity, Air Velocity, noise level, PM10, PM2.5, total suspended particles (TSP), and volatile organic compound (VOC). These reflect thermal comfort, contamination, physical hazards, and chemical pollutants from 3D printing processes and human occupancy. The study proposes a systematic IAQ parameter framework integrating standard measurement techniques as a conceptual reference for environmental monitoring, regulatory compliance, occupational health and safety (OSH) practices, and higher education accreditation requirements.

Integration of Membrane Technology and Intelligent Automation in Urban Wastewater Treatment: A Conceptual Critical Review

Darwis Baso — 2026-07-31

Increasing urbanization and urban population growth have intensified pressure on wastewater treatment systems, necessitating the development of more efficient, adaptive, and sustainable technologies. Conventional systems still face limitations in handling the complexity of wastewater characteristics and in meeting increasingly stringent effluent quality standards. This study aims to review the advancement of membrane technologies and intelligent automation, as well as to develop an integrative conceptual framework for urban wastewater treatment. The method employed is a critical literature review of 39 relevant scientific articles published between 2021 and 2025 and indexed in reputable databases. The results indicate that membrane technologies, such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, and membrane bioreactors, can significantly improve contaminant separation efficiency and produce high-quality effluent. Meanwhile, intelligent automation systems based on the Internet of Things (IoT) and artificial intelligence enable real-time, adaptive, and data-driven monitoring and process control, thereby enhancing operational efficiency and system reliability. The proposed integration has the potential to improve system responsiveness, energy efficiency, and sustainability, although its effectiveness remains conceptual. However, challenges such as membrane fouling, high energy consumption, and limitations in cost, infrastructure, and human resource capacity remain barriers to implementation. This study proposes an integrative conceptual framework that combines physical, biological, and digital technologies as a foundation for developing modern, adaptive, and sustainable urban wastewater treatment systems.