Thu hồi đất hiếm từ nước thải
Nguyên tố đất hiếm rất cần thiết đối với việc chế tạo các thiết bị điện tử hiện đại như dạng các nam châm, chất xúc tác, chất siêu dẫn... Tuy nhiên vì hiếm nên chúng rất đắt tiền. Nhưng gần đây các nhà khoa học đã tìm được cách thu hồi đất hiếm từ nước thải công nghiệp.
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