FIELD: sewage treatment. SUBSTANCE: spent acid and alkaline etching solutions were poured off up to pH 3-5, and formed mixture is diluted with water by 1.3-2-fold. Then sulfuric acid is added up to pH 1-2 in the solution, and copper content in prepared solution is determined. Then aluminium chips were loaded at quantity 0.8-1.2 of copper content in solution, and cementation is carried out at temperature 90 C, not above. After acidification with sulfuric acid solution is diluted with water up to copper concentration 20-60 g/l. Proposed method ensures to refine spent etching solutions up to copper concentration ≅ 0,001 g/l. 0.001 g/l. EFFECT: improved method of sewage treatment. 1 tbl
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