ĐÁNH GIÁ KHẢ NĂNG Ô NHIỄM KIM LOẠI NẶNG (Pb, Cu) TRONG NƯỚC RỈ TỪ BÙN THẢI NẠO VÉT TẠI SÔNG KIM NGƯU, HÀ NỘI=EVALUATION OF HEAVY METALS (Pb, Cu) POLLUTION IN LEACHING WATER F-ROM DISC-HARGED SLUDGE OF KIM NGUU RIVER, HANOI

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Tác giả: Thị Thúy Hà Cù, Thị Cẩm Vân Đỗ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Đại học Công nghiệp Hà Nội, 2018

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Bộ sưu tập: Metadata

ID: 350623

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Ô nhiễm bùn đáy nạo vétvà thải bỏ ven hai bên bờ sông Kim Ngưu, TP. Hà Nội đang ở mức báo động đỏ. Khi có tác động của quá trình rửa trôi từ nước mưa (mưa axit) kim loại nặng tích tụ trong bùn sẽ được giải phóng, đi theo pha lỏng nhanh chóng xâm nhập vào đất và các mạch nước ngầm. Trong nghiên cứu này chúng tôi tiến hành khảo sát sự chuyển hóa của hai kim loai nặng điển hình là chì và đồng từ mẫu bùn thải của sông Kim Ngưu bởi nước có pH khác nhau. Tại pH trung tính (pH = 6,5), sự chuyển hóa của ion Pb2+ và Cu2+ (nồng độ định lượng ban đầu là 0,11 và 0,11 mg/L tương ứng) trong bùn thải sang dạng hòa tan trong nước diễn ra chậm và không ổn định, nên hàm lượng kim loại nặng (Pb và Cu) tích lũy trong môi trường còn thấp, nồng độ Pb2+ và Cu2+ khảo sát sau 10 ngày xác định tương ứng là 14,73 và15,11 mg/L. Tuy nhiên, khảo sát tại pH axit (pH = 4,5), sự chuyển hóa chì và đồng (đặc biệt là chì) diễn ra nhanh chóng, khả năng thôi hóa đồng và chì vào pha nước cao, trong đó nồng độ Pb2+ và Cu2+ tăng tương ứng từ 0,15 và 0,11 mg/L lên tới26,20 và 18,76 mg/L. Điều này cho thấy, trong trường hợp có mưa axit nguy cơ ô nhiễm kim loại nặng gây ra bởi bùn thải nạo vét từ sông Kim Ngưu là rất cao, vấn đề quản lý và xử lý bùn trong sông Kim Ngưu là rất quan trọng và cần phải được thực hiện một cách khoa học.Sewage sludge pollution disc-harged across two riverside of Kim Ngưu, Hanoi has been serious. When raining water (espcially acid rain) occurs, heavy metals accumulated in sludge are released, dissolving into water and then underground water. In this study, we investigate the mobilization of typical heavy metals, Pb and Cu, leached f-rom Kim Nguu sewage sludge at different pH. At neutral pH (pH = 6.5), the dissolve ofPb2+ và Cu2+(Co = 0.11 và 0.11 mg/L equivalently) f-rom sludge into water is slow and unstable, thus the concentrations of Pb and Cu in the water are low, namely that of Pb2+ và Cu2+after 10 days determined are 14.73 và15.11 mg/L equivalently. However, at acid pH (pH = 4.5), the transformation of Pb and Cu into water (espcially Pb) occurs fast, the concentrations of Pb2+ và Cu2+increase sinificantly f-rom 0.15 và 0.11 mg/L lên tới26.20 and 18.76 mg/L equivalently. This result show that the risk of heavy metal pollution f-rom sewage sludge of Kim Nguu river is high when occuring acid rain, the management and treatment of Kim Nguu river sludge is very important and neccesary to be implemented scientifically.

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