Patent ID: 7449121
Filing Date: 2008-11-11
Classification: B01D

Abstract:
1. A method for removal of surface scum with an arrangement comprising an overflow arrangement comprising a first surface chute arrangement arranged in a substantially crosswise direction with respect to a longitudinal direction of the liquid basin, the first surface chute comprising a primary space and a secondary space configured to let the surface scum overflow in at least two successive phases from the liquid basin into the primary space and from the primary space into the secondary space, an exhaust assembly operatively connected to the overflow arrangement to exhaust the surface scum, and a second surface chute, the method comprising: controlling overflow of the surface scum from the primary space to the secondary space to minimize an amount of water drifting together with the surface scum by adjusting a level of the liquid in the primary space with at least one of a flow balancing assembly connecting the primary space and the second surface chute arrangement, or an adjusting device arranged in a wall defining the primary space and the secondary space.