Drum for processing mixed solid waste
A rotatable drum system includes a frame and a drum rotationally supported thereon. Paddles in an interior of the drum are angularly offset from the longitudinal axis. An eccentric opening offset from the longitudinal axis forms the egress. Mixed solid waste agitated by the paddles while in the drum. Trunnions may support the drum. An actuator may be pivotable with an upper frame relative to a lower frame and the actuator can cause drum rotation irrespective of a position of the upper frame relative to the lower frame. A trunnion assembly with a rocker pivotally coupled to a base thereof via a first axle, enables the rocker to be pivotable relative to the base about the first axle. A second axle may be rotationally coupled to the rocker. A roller may be rotationally coupled to the rocker via the second axle, and configured to support a rotating load.
1 . A vessel for processing a mixture of mixed solid waste (MSW) and water, comprising:
a cylindrical drum comprising an ingress at a proximal open end and an egress at a distal end, the drum configured to rotate about a longitudinal axis thereof;
a plurality of paddles joined to an internal surface of the drum and arranged angularly offset from the longitudinal axis; and
an end cap defining an eccentric opening offset from the longitudinal axis forming the egress at the distal end, wherein the eccentric opening is defined by the end cap such that the end cap forms a first wall portion having a height that is shorter than a second wall portion of the end cap,
wherein the mixture of MSW and water is received at the ingress during rotation of the drum such that the angularly offset plurality of paddles agitate and urge the received mixture towards the ingress to thereby facilitate retention of the mixture of MSW in the drum, and
wherein during the rotation of the drum, the mixture advances towards the end cap, and as a level of the mixture reaches the height of the first wall portion, the mixture exits the eccentric opening.
2 . The vessel of claim 1 , further comprising a plurality of lifters joined to the internal surface of the drum and extending along the longitudinal axis from the ingress to the egress, wherein during the rotation of the drum, the plurality of lifters agitate the mixture within the drum.
3 . The vessel of claim 2 , wherein at least one of the plurality of lifters is arranged perpendicular to the first wall portion, and wherein a width of the at least one lifter at the first wall portion is the same as the height of the first wall portion such that the at least one lifter guides the mixture out of the egress.
4 . The vessel of claim 3 , wherein at least one of the plurality of lifters is arranged perpendicular to the second wall portion, and wherein a width of the at least one lifter at the second wall portion is shorter than a height of the second wall portion such that the at least one lifter facilitates retention of the mixture within the drum.
5 . The vessel of claim 2 , wherein at least one of the plurality of lifters is arranged perpendicular to the second wall portion, and wherein a width of the at least one lifter at the second wall portion is shorter than a height of the second wall portion such that the at least one lifter facilitates retention of the mixture within the drum.
6 . The vessel of claim 1 , further comprising another plurality of paddles joined to an interior of the drum and arranged angularly offset from the longitudinal axis such that the another plurality of paddles agitate and urge the received mixture towards the egress to thereby facilitate movement of the mixture towards the egress.
7 . The vessel of claim 1 , wherein the drum is configured to be pivoted about the longitudinal axis from 0 to 25 degrees to adjust a rate of egress of the MSW from the eccentric opening.
8 . The vessel of claim 6 , further comprising a drive device for causing the drum to rotate, wherein the drive device is configured to pivot with the drum.
9 . The vessel of claim 8 , wherein the drive device comprises a chain drive.
10 . The vessel of claim 1 , wherein the drum defines jacketed sidewalls such that the mixture is retained in the drum until reaching the egress.
11 . The vessel of claim 1 , wherein the plurality of paddles are arranged in a helical pattern around the longitudinal axis.
12 . A method of processing a mixture of MSW and water in a drum, comprising:
rotating a cylindrical drum about a longitudinal axis thereof, the drum comprising an ingress at a proximal open end and an egress at a distal end, a plurality of paddles joined to an internal surface of the drum and arranged angularly offset from the longitudinal axis, and an end cap defining an eccentric opening offset from the longitudinal axis and forming the egress, the eccentric opening defined by a first wall portion of the end cap having a height that is shorter than a second wall portion of the end cap; and
loading the mixture of MSW and water into the rotating drum at the ingress,
wherein the mixture of MSW and water is received at the ingress of the drum such that the angularly offset plurality of paddles agitate and urge the received mixture towards the ingress during rotation of the drum to thereby facilitate retention of the mixture of MSW in the drum,
wherein during the rotation of the drum, the mixture advances towards the eccentric opening, and
wherein as a level of the mixture reaches the height of the first wall portion, the mixture exits the eccentric opening.
13 . The method of claim 12 , further comprising pivoting the drum about the longitudinal axis by an angle of about 0.5 to 25 degrees to adjust a residence time of the mixture in the drum.
14 . The method of claim 13 , wherein a residence time of the mixture in the drum results in organics in the MSW being hydrated to about 70 to about 100 percent.
15 . The method of claim 12 , wherein prior to the step of loading, further comprising the step of processing the MSW in a bag opener to release MSW from bags.
16 . The method of claim 15 , wherein the bag opener operates to release MSW from bags using jetted water nozzles, and wherein the mixture of MSW and water is received from the bag opener.
17 . The method of claim 16 , wherein the mixture of MSW and water is received from the bag opener continuously from a chute leading from the bag opener to the ingress of the drum.
18 . The method of claim 12 , wherein the water in the mixture is provided at about 50 to 150 gpm.
19 . The method of claim 18 , wherein the MSW in the mixture is provided at about 100 to 200 pounds per minute.
20 . The method of claim 12 , further comprising another plurality of paddles joined to an interior of the drum and arranged angularly offset from the longitudinal axis such that during the rotation of the drum, the another plurality of paddles agitate and urge the received mixture towards the egress to thereby facilitate movement of the mixture towards the egress.