METHOD OF PURIFYING SEWAGE WATERS OF MELAMINE PRODUCTION Russian patent published in 2015 - IPC C02F1/58 C02F1/02 C07D251/56 C02F101/38 C02F103/36 

FIELD: chemistry.

SUBSTANCE: two stages of thermal hydrolysis of sewage are carried out. At the first stage basic thermal hydrolysis of sewage water is realised at temperature 180-270°C until 95.0-99.9% of triazine derivatives contained in sewage are decomposed. Processed at the first stage sewage in quantity 20-80% is recirculated into technological process. At the second stage final thermal hydrolysis at temperature 180-270°C of residual part of sewage, processed on first stage, is realised.

EFFECT: achievement of high degree of purification and reduction of amount of purified sewage waters, discharged into sewerage, reduction of clean water consumption in technological process with simultaneous simplification of technology and reduction of energy consumption.

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