Patent ID: 8182700

Claim:
A method in the removal of surface scum, the method comprising: using an exhaust arrangement connected to a liquid basin, the exhaust arrangement comprising a first surface chute arrangement for removal of surface scum utilizing an overflow arrangement, belonging to the first chute arrangement and being based on a continuous flow, wherein the surface scum is overflown in at least two successive phases, from the fluid basin into a primary space in the fluid basin and from the primary space into a secondary space in the fluid basin, from where the surface scum is finally exhausted from the liquid basin utilizing an exhaust assembly for the surface scum, and a second surface chute arrangement for removal of liquid, being processed in the liquid basin, and whereby overflow of the surface scum in the primary space to the secondary space is controlled to minimize an amount of liquid drifting together therewith by adjusting a level of the liquid in the primary space utilizing a flow balancing assembly, connecting the primary space and the second surface chute arrangement, and/or by using an adjusting device existing in the wall defining the primary space and the secondary space, wherein passage of the surface scum in the primary space towards the secondary space is made more efficient utilizing a liquid flow in the primary space towards the secondary space by using a self-powered guiding arrangement that exploits a difference in surface levels of the liquid basin and the primary space, wherein the liquid flow is achieved by a hole and/or a nozzle assembly existing in a wall defining the liquid basin and the primary space, the liquid spaces thereof being thus connected by said assembly.