FIELD: industrial sewage treatment. SUBSTANCE: method for tar-treatment includes polycondensation of phenol and formaldehyde in acid medium and process of aldol condensation of formaldehyde. Prior to polycondensation, the tar water is treated with bischofite. EFFECT: improved adaptability to process due to reduced time, simplified equipment, excluded effluents of ecologically harmful substances, production of water purified from phenol and formaldehyde and applicable in water circulation cycles.
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