Patent ID: 8376145

Claim:
A device for purification of water from particles of petroleum and/or petroleum-derived products, collectively called oil particles, said device comprising: a pump; a water dynamic processing unit (WDPU) substantially connected to said pump, said WDPU comprising a housing, said housing enclosing a through channel for passing a liquid flow of water containing said oil particles, said channel including: a first section having a variable passage cross-section decreasing downstream along a direction of movement of said liquid flow, said first section has a length S; a minimal passage cross-section of said channel, said minimal passage cross-section has a diameter D; a second section having a variable passage cross-section increasing downstream along the direction of movement of said liquid flow; wherein said first section has an inner surface being in contact with said liquid flow, said inner surface of the first section includes a zone consisting of a plurality of protrusions and deepenings, wherein said protrusions each has a height, at least one of said protrusions has a maximal height greater than the heights of the other protrusions; said zone is adjacent to said minimal passage cross-section, said zone has a length L and a width K defined according to the following formulas: K=mD, wherein m is a coefficient taking on any value in the range of from 0.001, to 1; L=nS, wherein n is a coefficient taking on any value in a range of from 0.1, to 0.5; and said WDPU is capable of operating under a pressure differential ranging from 0.1*10 5 Pa to 25*10 5 Pa.