Method and device for separating liquid and a second substance

Details Method and device for separating liquid and a second substance Method and device for separating liquid and a second substance

B - Operations, Transporting

01

D

165/61

B01D 47/02 (2006.01) B01D 17/02 (2006.01) B03D 1/02 (2006.01) B03D 1/24 (2006.01)

Patent

CA 2026901

ABSTRACT METHOD AND DEVICE FOR SEPARATING LIQUID AND A SECOND SUBSTANCE tHE invention relates to a method for separating at least one liquid, for example water, and a second substance, for instance oil and/or pollutants, from a liquid fluid, for example a suspension or dispersion, by flotation by means of air. According to the invention, a calm flotation zone, in which small air bubbles are present, is separated by means of a bell-jar periphery from a rise zone for large air bubles. Large air bubbles would disturb the separation because they have a strong tendency to rise, whereby they create agitation more than they carry second substance upwards. The large air bubbles enter the bell-jar. The small air bubbles which adhere to particles of second substance result in an adequate flota- tion of these particles in a calm zone.

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