Patent ID: 7410576
Filing Date: 2008-08-12
Classification: B01D

Abstract:
1. A filtration system for separating at least one target solid from a sludge, the filtration system comprising: a transportable open-topped box having a horizontal floor panel and a plurality of wall panels upwardly extending from the floor panel and connected to each other and to the floor panel to define a sealed enclosure within the box, the wall panels of the box extending substantially perpendicularly upward from the floor panel; a filtering assembly disposed within the box, the filtering assembly having filtering walls and a filtering floor connected together to enclose a filter chamber within which the sludge is received, the filtering walls including two end filtering walls and two long side filtering walls, the two long side filtering walls extending along a longitudinal length of the box, each of the long side filtering walls being inclined with respect to a vertical plane defined by a corresponding one of the wall panels of the box such that a bottom edge of the long side filtering wall is located inward of a top edge thereof, wherein a first cavity longitudinally extends between each of the long side filtering walls and the corresponding one of the wall panels of the box, each said longitudinally extending cavity having a transversal width defined between an outer surface of the long side filtering wall and an inner surface of the corresponding one of the wall panels, the transversal width of the longitudinally extending cavity increasing continuously from the top edge of the long side filtering wall to the bottom edge thereof such as to define a triangularly shaped liquid evacuation channel formed between the filtering assembly and the box along the longitudinal length thereof, wherein the triangularly shaped liquid evacuation channel provides greater liquid evacuation capacity at its wider lower end than at its narrower upper end; the filtering floor of the filtering assembly being inclined with respect to the underlying horizontal floor panel of the box such as to define a second cavity therebetween, the second cavity having a height defined between the horizontal floor panel of the box and the inclined filtering floor of the filtering assembly, the height of said second cavity increasing continuously from a first end of the filter chamber, wherein the filtering floor meets one of said end filtering walls, to a longitudinally opposed second end of the filter chamber, wherein the filtering floor meets the other one of said end filtering walls; the filtering assembly including a filtering partition extending upwardly from the filtering floor along a longitudinal length of the filter chamber, the filtering partition including laterally spaced apart filter panels inclined with respect to the vertical plane and defining a third cavity therebetween, the third cavity having a transversal width that increases continuously from an upper end thereof to a lower end thereof such as to define a second triangularly shaped liquid evacuation channel which provides greater liquid evacuation capacity at its wider lower end than at its narrower upper end; a plurality of openings defined in the filtering walls and the filtering floor, the plurality of openings being sized to let liquid pass through and retain the at least one target solid of the sludge within the filter chamber; an inlet in fluid communication with the filter chamber; and an outlet in the box in fluid communication with the first, second and third cavities, the outlet being defined at the first end of the box wherein the height of the second cavity defined between the filtering floor and the horizontal wall panel is the smallest; whereby the sludge enters the filter chamber through the inlet, the at least one target solid being retained within the filter chamber while liquid reaches the first, second and third free spaces through the plurality of openings before being evacuated through the outlet.