BRIEF DESCRIPTION OF THE DRAWINGS
In the following the present invention is described in more detail, by way of example only, with reference to the attached schematic drawings, in which
FIG. 1 illustrates a vacuum sewer system,
FIG. 2 shows an embodiment of an active buffer device,
FIG. 3 illustrates the flow connections of the control unit of the vacuum sewer system provided with an active buffer device,
FIG. 4 shows alternative embodiments of an active buffer device, and
FIG. 5 illustrates the flow connections of the control unit of the vacuum sewer system provided with an alternative embodiment of a vacuum buffer device.