Drum washer with gravity assist drainage

A rotary drum filter comprising:

• a drum shell having areas defining a plurality of drainage holes, wherein the drum shell is configured to rotate through a slurry;
• a plurality of grid holders configured to extend longitudinally on an outer surface of the drum shell at arcuate intervals;
• a first drainage sector disposed between a first grid holder and a middle grid holder;
• a second drainage sector disposed adjacent to the first drainage sector between the middle grid holder and a second grid holder, wherein each of the first and second drainage sectors have:
• a first longitudinal edge distally disposed from a second longitudinal edge, and
• a first lateral edge distally disposed from a second lateral edge, wherein the first drainage sector and the second drainage sector have drainage holes disposed near the first lateral edge and the second lateral edge;
• divider plates disposed on the outer surface of the drum shell and extending longitudinally and laterally within the first drainage sector and the second drainage sector, wherein a first end of a first divider plates in the first drainage sector and a first end of a first divider plate in the second drainage sector converge toward the middle grid holder;
• and
• a filter medium disposed on the plurality of grids,
• wherein the divider plates are configured to direct filtrate flow on the outer surface of the drum shell into one or more of the plurality of drainage holes.

A rotary filter comprising:

• a drum shell having areas defining a plurality of drainage holes wherein the drum shell is configured to rotate through a slurry;
• a filter medium disposed on one or more grids, wherein the one or more grids are disposed on an outer surface of the drum shell;
• divider plates disposed on an outer surface of the drum shell beneath the one or more grids and extending longitudinally and laterally along the drum shell along an upper section of an ascending drainage sector of the drum shell to a lower section of the ascending drainage sector with respect to a rotational direction of the drum shell of the drum shell, wherein the divider plate comprises a first end and a second end, and wherein the first end is disposed near a first drainage hole and the second end is disposed near a second drainage hole,
• wherein the divider plates are configured to direct filtrate on the outer surface of the drum shell into the drainage hole.