Xác định ảnh hưởng của nhiệt độ đến tốc độ phân hủy chất hữu cơ trong nước sông Cái

Xác định ảnh hưởng của nhiệt độ đến tốc độ phân hủy chất hữu cơ trong nước sông Cái - tỉnh Đồng Nai

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Tác giả: Thế Tiến Nguyễn, Văn Sơn Nguyễn, Chí Sỹ Phùng

Ngôn ngữ: Vie

Ký hiệu phân loại:

Thông tin xuất bản: Khí tượng Thủy văn 2023

Mô tả vật lý: 42-54

Bộ sưu tập: Metadata

ID: 406761

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Tóm tắt
Chủ đề

Các nghiên cứu về khả năng tự làm sạch của dòng sông tại Việt Nam đã được công bố với công cụ sử dụng là mô hình toán, các hệ số thực nghiệm được sử dụng theo gợi ý của mô hình vì vậy làm cho kết quả có độ chính xác không cao. Hệ số tốc độ phân hủy chất hữu cơ là thông số quan trọng liên quan đến khả năng tự làm sạch chất hữu cơ trong nước sông, trong đó nhiệt độ có ảnh hưởng đáng kể đến hệ số này. Trong nghiên cứu này mẫu nước là mẫu tổ hợp của 90 mẫu đơn lấy theo 2 thời điểm triều cường và triều kiệt tại 5 vị trí theo chiều dài dòng sông Cái. Các mẫu nước được phân tích BOD trong 20 ngày ở các nhiệt độ 20oC, 25oC, 30oC, 35oC, 40oC. Tốc độ phân hủy chất hữu cơ được xác định theo phương pháp Slope. Kết quả cho thấy tốc độ phân hủy chất hữu cơ của nước sông tăng khi nhiệt độ tăng từ 20oC lên 30oC, đồng nghĩa với khả năng tự làm sạch chất hữu cơ trong nước sông Cái tăng. Tuy nhiên, khi nhiệt độ tăng từ 30oC lên 40oC, hệ số tốc độ phân hủy chất hữu cơ giảm. Bên cạnh đó, phương trình tương quan giữa hệ số tốc độ phân hủy chất hữu cơ và nhiệt độ đã được xác định với R2 = 0,93., Tóm tắt tiếng anh, A number of studies on the self-cleaning capacity of rivers in Vietnam have been published with the tools used to evaluate by mathematical model, the experimental coefficients are used as suggested by the model so the results of evaluation and prediction are not very accurate. The decomposition rate coefficient is an important parameter related to the self-cleaning capacity of organic matter in river water, where temperature has a significant effect on this factor. In this study, the composite sample from 90 water amounts which were collected at five sites in two different tide conditions along Cai river. The sample was separated into five parts to analyzed BOD in five temperature values including 20oC, 25oC, 30oC, 35oC and 40oC. The deoxygenation rate was determined using Slope method. According to these results, the deoxygenation rate increased during the temperature ranging between 20oC and 30oC and decreasing when the temperature decreased from 30oC to 40oC. It meant that the ability of river self-cleaning improved when the temperature raises from 20oC to 30oC and reduce when the temperature keeps raising to 40oC. In addition, the correlation between deoxygenation rate and temperature by Slope method is determined with R2 = 0,93.

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