FIELD: waste water purification. SUBSTANCE: invention concerns, in particular, biological purification of waste water. Apparatus of invention allows efficiently saturating liquid with gas mixture component easily penetrating through membrane walls. As dispersing member, membrane package of hollow fibers is used which is epoxydated from the two ends and is cut perpendicularly to axis. The two ends containing open ends of hollow fibers are inserted into collecting channels for feeding and removing gas. EFFECT: increased efficiency of gas saturation. 1 dwg
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