METHOD OF SEWAGE TREATMENT FROM DYE-STUFFS AND SURFACE-ACTIVE AGENTS Russian patent published in 1995 - IPC

FIELD: sewage treatment. SUBSTANCE: method of sewage treatment from dye-stuffs and surface-active agents consists in their preliminary cleaning, separation by back osmosis with obtaining of a flow of purified water and flow of concentrate containing surface-active agents, their amount exceeding the critical concentration of mycelium formation, ultrafiltration. It is preferably to carry out ultrafiltration with return of part or whole flow of obtained concentrate for repeated ultrafiltration with the aid of a jet pump; the flow of returned concentrate is directed to the pump branch pipe for inlet of passive flow, and the flow of concentrate obtained at separation of preliminarily treated sewage by back osmosis is directed to the active flow inlet pipe. EFFECT: facilitated procedure. 2 cl, 1 dwg