METHOD OF SEWAGE TREATMENT OF DYE MANUFACTURE Russian patent published in 1995 - IPC

FIELD: sewage treatment. SUBSTANCE: anionic or cationic polyelectrolyte and low-molecular surface-active substance containing ionogenic group charge of which is contrast to polyelectrolyte charge were added to the sewage at any sequence. In the case of anionic polyelectrolytes compound of the general formula R₁R₂R₃R₄N⁺X^- or R₅N⁺C₅H₅X^- where R₁= H, CH₃, C₂H₅, R₂= H, CH₃, C₂H₅, C₈H₅, C₈H₁₇, R₃=H, CH₃, C₂H₅, C₈H₁₇, CH₂C₆H₅, R₄ - alkyl-C₈-C₁₈, HOCH₂(CH₂)₅, C₂H₅OOC(CH₂)₁₅, R₅ - alkyl-C₁₀-C₁₆, alkyl-C₁₉-C₁₈-OOCCH₂,X-Cl,Br is used as a surface-active substance. In the case of cationic polyelectrolytes - compound of the general formula: R₆Y where R₆ - alkyl-C₈-C₁₆, C₁₂H₂₅C₆H₄, Y - Y= OSO₃M, SO₃M, M=X,Na. Anionic polyelectrolytes have carboxylic and/or sulfate, and/or sulfonate, and/or phosphate, and/or silanol group, and cationic ones - quaternary ammonium or pyridinium or guanidinium group. EFFECT: improved method of sewage treatment. 1 tbl