| 摘要 |
PCT No. PCT/IT89/00021 Sec. 371 Date Sep. 18, 1990 Sec. 102(e) Date Sep. 18, 1990 PCT Filed Mar. 22, 1989 PCT Pub. No. WO89/09309 PCT Pub. Date Oct. 5, 1989.Removal from the surface of bodies of water of oily and floating matters is conducted by preliminarily increasing the concentration of the oily and floating matters in the upper water layers by separating a liquid surface layer sufficiently thick to contain substantially all of the oily and floating matters, simultaneously giving the separated layer a relative speed so as to forward it to subsequent treatment steps with a minimum of or no turbulence, and introducing the separated layer into a basin having a horizontal size relative to the cross-section where the initial separation occurred such as to substantially reduce the relative velocity of the liquid flow, where the level of the liquid in the basin is kept near to the average level of the body of water outside the basin. The water in the basin is caused to have a downward flow direction by sucking from the bottom of the basin, leaving the already separated oil at the surface, thereby increasing its concentration. An upper liquid layer is then withdrawn from the basin surface. The upper liquid layer is forwarded to further decantation treatment where the liquids withdrawn from the surface layers are passed at low speed through an array of communicating tanks from which the water deposited at the bottom is sucked out and discharged while the oil is withdrawn and sent to store. An apparatus facilitating the method and the present invention is also disclosed. |
