Nghiên cứu một số tính chất của bùn thải đô thị thành phố Đà Nẵng nhằm định hướng tái sử dụng làm vật liệu xây dựng=Properties and Potential Application of Urban Sewage Sludge as Construction Material in Da Nang Cit

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Tác giả: Xuân Huân Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học Trái đất và Môi trường, 2024

Mô tả vật lý: tr.51-58

Bộ sưu tập: Metadata

ID: 474337

Thêm vào giỏ

Nghiên cứu về tính chất bùn thải góp phần quan trong việc quản lý và tái sử dụng bùn thải cho mục đích khác nhau. Nghiên cứu này triển khai lấy 60 mẫu bùn thải trên hệ thống sông thoát nước đô thị tại thành phố Đà Nẵng và phân tích các đặc tính lý hóa học của bùn thải. Kết quả nghiên cứu cho thấy, thành phần cấp hạt của các mẫu bùn chủ yếu là cát, dao động từ 52,2 đến 90,1%, pH dao động từ 4,3 đến 6,8 ở mức axit yếu đến trung tính, hàm lượng tổng cacbon hữu cơ dao động từ 1,1 đến 6,0% và có sự chênh lệch khá lớn giữa các mẫu. Hàm lượng Cl-, SO4 2- dao động từ 0,07 đến 1,92%. Có 45/60, 31/60 và 26/60 mẫu nghiên cứu có hàm lượng Zn, Pb và Hg vượt quy chuẩn kỹ thuật quốc gia về chất lượng trầm tích (QCVN 43:2017/BTNMT) tương ứng từ 1,04-2,52
1,02-1,61 và 1,4-5,8 lần. Hàm lượng As, Cd trong tất cả các mẫu nghiên cứu đều thấp hơn giới hạn tối đa cho phép theo QCVN 43:2017/BTNMT. Hàm lượng Ag, Co, Se thấp hơn giới hạn phát hiện của phương pháp ở tất cả các mẫu nghiên cứu. 48/60 mẫu bùn nghiên cứu có hàm lượng phenol vượt QCVN 43:2017/BTNMT từ 2,38-6,91 lần. Với kết quả về thành phần và tính chất như trên, bùn thải đô thị thành phố Đà Nẵng có thể tái sử dụng để làm vật liệu xây dựng theo hướng kinh tế tuần hoàn.Research on sludge properties makes an important contribution to the management and reuse of sludge for different purposes. In this study, 60 sludge samples were sampled from the urban drainage river system in Da Nang city and analyzed for their physical and chemical properties. The results show that the composition of the sludge samples are mainly sand, ranging from 52.2 to 90.1%, pH at slightly acidic to neutral levels, ranged from 4.3 to 6.8, total organic carbon content ranged from 1.1 to 6.0% and there was a large difference within samples. The content of Cl-, SO4 2- ranges from 0.07 to 1.92%. There were 45/60, 31/60, and 26/60 samples with Zn, Pb and Hg contents exceeding the national technical regulation on sediment quality (QCVN 43:2017/BTNMT), respectively, from 1.04 - 2.52, 1.02 – 1.61, and 1.4 – 5.8 times. The As and Cd contents in all research samples were lower than the maximum allowable level (QCVN 43:2017/BTNMT). Ag, Co, and Se content were undetected in all samples. 48/60 sludge samples had phenol content exceeding QCVN 43:2017/BTNMT by 2.38 - 6.91 times. With this result, urban wastewater sludge in Da Nang city could be reused as bricked construction materials for a circular economy.

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