FIELD: waste water treatment. SUBSTANCE: invention concerns methods for treatment of carbonate-containing washing liquors after washing of transport tanks. Part of washing liquor is mixed with lime and settled at temperature above 43 C to precipitate calcium carbonate in the form of aragonite. The rest of washing liquor is filtered through this aragonite cake. Surface of aragonite crystals is capable of adsorbing significant amounts of crude oil and for that reason this filtration layer can be used for filtration of such an amount of exhausted lye that is at least threefold larger than its amount required for preparation of indicated filtration layer for preliminary filtration. EFFECT: increased cleaning degree and intensified recovery of precipitate from washing liquor. 6 cl, 2 dwg
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