| 20110240562 | METHOD AND SYSTEM FOR BACKWASHING A FILTER - A method for purifying fluids and a sedimentation tank, the sedimentation tank includes: a perforated plate spaced from an upper and of the sedimentation tank dividing the sedimentation tank into an upper chamber and a lower chamber; an inlet adapted to inlet fluid into the tank; a first outlet, positioned above the perforated plate for outletting a clarified fraction of the fluid; a second outlet positioned at a bottom of the tank, for outletting a concentrated sludge fraction of the fluid; a pump; and a washing mechanism, positioned at least partially above the perforated plate; wherein the pump is adapted to provide a washing fluid to the washing mechanism when a level of fluid in the sedimentation tank is below a predefined level; and wherein the washing mechanism washes an upper surface of the perforated plate by the washing fluid. | 10-06-2011 |
