The present invention provides a new and improved method and apparatus for separating a disperse mixture of two non-miscible liquids to increase the separation extent within less time required as per usual. The proposed method includes the steps of providing a tank having an elongated horizontal extension terminated by two end faces (4, 5), creating within said tank an interface (13) between a first layer formed by a volume of one of said two liquids and a second layer formed by a volume of the other of said two liquids with, and supplying said disperse mixture into the tank from one of said end faces (4) thereof directly into said interface (13).The inventive apparatus comprises a tank having an inlet opening (6) mounted at an end wall (4) at the beginning of the said elongated horizontal path for supplying the said mixture to be separated, two outlet openings (7, 8) mounted at the end of the said elongated horizontal for separately draining the separated liquids, whereby an outlet opening (8) is located below the inlet opening and is connected to a vertical channel (10) furnished with a sink (11) which is located at least on the level of the inlet opening (6).