3. ASSESSMENT OF WATER QUALITY IN DAU TIENG LAKE IRRIGATION SYSTEM IN THE SOUTHEAST REGION, VIETNAM 2024

Tóm tắt

This study was conducted to assess the surface water quality of Dau Tieng reservoir. A total of 32 water samples were collected during the dry season (April 2024) and the rainy season (October 2024) from 16 monitoring sites across the reservoir. Fifteen water quality parameters were analyzed, including pH, BOD₅, COD, DO, TSS, NH₄⁺, NO₂⁻, NO₃⁻, PO₄³⁻, As, Pb, Cd, Cu, Fe, and Coliforms. The results were compared against the national surface water quality standards (QCVN 08:2023/BTNMT) and evaluated using the Water Quality Index (WQI). The findings indicated both seasonal and spatial variations in water quality. Several parameters exceeded permitted limits, particularly during the rainy season, with elevated concentrations of BOD₅, COD, NH₄⁺, Cu, and Fe observed frequently. WQI analysis showed that most water samples fell within the “average” to “good” quality categories, indicating suitability for agricultural irrigation and treated domestic use. However, certain areas, especially during the rainy season, exhibited signs of organic and nutrient pollution, highlighting the need for strengthened water management and pollution control measures.