Đánh giá diễn biến chất lượng nước tại hệ thống thủy lợi Quản Lộ - Phụng Hiệp

Abstract

The Quan Lo Phung Hiep irrigation system is located in the south of the Hau in the Mekong Delta, with the task of supplying water for production activities of people in Bac Lieu, Soc Trang, Ca Mau, Kien Giang and Hau Giang provinces. Currently, the quality of water sources is showing signs of deterioration, so the management and monitoring of water resources is very necessary. The study used statistical methods to assess water quality changes in the Quan Lo - Phung Hiep irrigation system in the period 2015-2022. The results showed that, there was an increase in iron alum pollution at Cau Sap culvert (QL1), Vinh My culvert (QL2), Lang Tram culvert (QL5), Ca Mau culvert (QL6) and Da culvert (QL9), a decrease in alluvium, and increase in organic and nutrient pollution at all locations in the period 2015-2022. But a positive sign is the reduction of microbiological contamination in the area. In addition, the results of Granger's test of causality between salinity and other water quality parameters showed that salinity had an impact on 5 parameters: pH, DO, COD, NH₄⁺, Fe (p < 0.05). Salinity interacts with PO₄^3- and is independent of TSS, NO₃^-, NO₂^- and Coliform