[en] Purpose: To prevent the production of adhesive scales upon the concentration of the liquid waste and to prevent the corrosion of a gaps in the concentrating equipment by adding oxine to the liquid waste. Method: The liquid waste of an atomic plant is concentrated by adding approx. 3wt% of oxine (8-hydroxyquinoline). Calcium and magnesium in the liquid waste form a complex with the oxine, the complex is insoluble in water, but dose not form adhesive scales even if it is concentrated and reduced in volume, nor does it corrode the gap in the concentrating equipment and so enables safe operation for a long time. (Yoshihara, H.)