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All Journal IJES : Indonesian Journal of Environmental Sustainability.
Aryanti, Janu Andina
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering

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THE EFFECTIVENESS OF ONLIMO UTILIZATION FOR WATER QUALITY MONITORING OF POLLUTION IN THE DOWNSTREAM AREA OF JANGKOK RIVER, MATARAM CITY Aryanti, Janu Andina; Utama, Pramudya Bagas; Nabila, Maitsa Fikri
Indonesian Journal of Environmental Sustainability Vol. 3 No. 1 (2025): June 2025
Publisher : Center for Environmental Studies, Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ijes.v3i1.6822

Abstract

The Jangkok River in Mataram City, Nusa Tenggara Barat, experiences severe pollution due to domestic and industrial waste. To monitor water quality in real-time, the Online Monitoring (ONLIMO) system has been implemented. This study aims to evaluate the effectiveness of ONLIMO compared to laboratory analysis in terms of accuracy, time, and cost. Physical and chemical parameters such as BOD, COD, DO, Nitrite, Nitrate, pH, TDS, and turbidity were analyzed using the Pollution Index (IP) method based on the Decree of the Minister of Environment No. 115 of 2003. The results showed an average Ci/Lij value of 1.70 with a maximum IP of 115.97 from ONLIMO, while the laboratory analysis produced an IP of 98.26 with a maximum Ci/Lij of 138.9. Nitrite (11.15–14.35) and turbidity (6.55–9.74) were identified as dominant contributors to pollution. In terms of efficiency, ONLIMO proved faster, with real-time monitoring and lower operational costs compared to laboratory methods, which require sample collection and manual analysis. However, ONLIMO has limitations in detecting certain parameters such as BOD. Overall, ONLIMO is considered efficient and effective for monitoring the water quality of Jangkok River, with potential improvements through the integration of additional methods for more accurate and comprehensive results.
Co-Authors Nabila, Maitsa Fikri Utama, Pramudya Bagas