SURFACE SCUM REMOVAL
The scraper flight in the Finnchain system, moving at the surface of the tank, transfers the floating scum to the scum collection box on the side wall of the tank. The efficiency of the scum removal is based on scum gates located in the scum collection box. The scum gates open up when the scraper flight approaches the scum collection box, causing a water flow which enables the efficient collection of the scum. The water flow transfers the surface scum to a removal pipe for further treatment, and prevents freezing during winter. The opening of the scum gates can be adjusted, which enables more efficient removal of the surface scum.