Ảnh hưởng của tiền xử lý điện hóa và môi trường bảo dưỡng đến độ bền và khả năng rò rỉ của trầm tích ô nhiễm đã được ổn định/đặc hóa

Anna Norén1, Ann-Margret Strömvall1, Sebastien Rauch1, Yvonne Andersson-Sköld2,3, Oskar Modin1, Karin Karlfeldt Fedje1,4
1Division of Water Environment Technology, Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden
2Swedish National Road and Transport Research Institute (VTI), Gothenburg, Sweden
3Division of Geology and Geotechnics, Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden
4Recycling and Waste Management, Renova AB, Gothenburg, Sweden

Tóm tắt

Quá trình ổn định và đặc hóa (S/S) được biết đến là cải thiện các đặc tính cấu trúc của trầm tích và giảm tính di động của các chất ô nhiễm, cho phép sử dụng trầm tích ô nhiễm đã được nạo vét. Việc giảm các chất ô nhiễm (ví dụ: tributyltin (TBT) và kim loại) có thể được thực hiện bằng cách sử dụng điều trị điện hóa trước khi thực hiện S/S và có thể giảm thiểu đáng kể sự rò rỉ của chất ô nhiễm. Đây là nghiên cứu đầu tiên về cách tiền xử lý điện hóa ảnh hưởng đến độ bền và đặc tính rò rỉ của trầm tích được ổn định. Nghiên cứu cũng xem xét cách độ mặn và carbon hữu cơ trong dung dịch bảo dưỡng ảnh hưởng đến trầm tích đã được ổn định. Kết quả cho thấy quá trình điện phân đã giảm 22% hàm lượng TBT và 44% hàm lượng kẽm trong trầm tích. Các mẫu đã được ổn định qua điện phân đáp ứng các yêu cầu về độ bền nén và có mức độ rò rỉ bề mặt của kẽm thấp hơn. Việc bảo dưỡng trong nước mặn có lợi cho sự phát triển độ bền và giảm rò rỉ TBT so với việc bảo dưỡng trong nước ngọt. Kết quả cho thấy rằng tiền xử lý trước khi ổn định có thể có lợi trong việc giảm sự rò rỉ chất ô nhiễm và phục hồi kim loại từ trầm tích. Kết luận đưa ra rằng cần có sự hiểu biết tốt hơn về những thay đổi trong trầm tích do điều trị điện hóa gây ra và cách mà những thay đổi này tương tác với các phản ứng ổn định. Ngoài ra, khuyến nghị nên điều tra hành vi độ bền và khả năng rò rỉ trong các môi trường tương tự với điều kiện tại chỗ dự kiến.

Từ khóa

#ổn định #đặc hóa #trầm tích ô nhiễm #điều trị điện hóa #độ bền #khả năng rò rỉ

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