Vận dụng phương pháp tính toán khả năng tự làm sạch hồ thủy điện thông qua các kết quả xác định tổng chất ô nhiễm chính lưu vực tấn N/P, nồng độ các ô nhiễm chính nguồn nước đầu vào và ra khỏi hồ, nồng độ chất ô nhiễm lưu vực (mg/L), đầu vào chất ô nhiễm lưu vực (tấn/ngày), thời gian lưu nước. | VNU Journal of Science Earth and Environmental Sciences Vol. 36 No. 3 2020 12-24 Original Article Self-Cleaning Ability of Pollutants Containing Nitrogen and Phosphorus Transformed into NH4 NO2- NO3- PO43- of SonLa Hydropower Reservoir Do Xuan Duc1 2 Luu Duc Hai2 Do Huu Tuan2 1 Tay Bac University Quyet Tam Wards Son La City Son La Province Vietnam 2 VNU University of Science 334 Nguyen Trai Hanoi Vietnam Received 21 Octeber 2019 Revised 10 May 2020 Accepted 19 May 2020 Abstract The waste source containing nitrogen N and organic phosphorus P into the hydropower reservoir will be transformed into pollutants NH4 NO2- NO3- PO43-. Son La hydropower reservoir has an area of 225 km2 of water surface and km2 of water supply basin for electricity generation Son La hydroelectricity plant and dam which is particularly important in terms of socio-economic and national conditions room security. Using the method of calculating emissions with appropriate coefficients tons of nitrogen year and tons of phosphorus year were added to the lake in 2019 through the data of population livestock fish cages farming. Semi-submerged agriculture depositing air into the lake. Applying the method of calculating the self-cleaning capacity of hydropower reservoirs through the results of determining the total main pollutants in the catchment tons N P the concentration of main pollutants in the water input and out of the lake the concentration catchment pollutant mg L basin pollutant input tons day hydraulic retention time. Thereby the Son La hydropower reservoir self-cleaning tons year with pollutants of groups NH4 NO2- NO3- PO43- specifically a volume of million m3 and 16 days to save water. tons were cleaned a capacity of million m 3 with 37 days to save water the lake cleaned tons a capacity of million m3 and a retention time was 52 days the lake cleaned tons. Keywords self-cleaning pollutant nitrogen phosphorus NH4 NO2- NO3- PO43-
