Liquid purification or separation – Processes – Separating
Patent
1988-03-22
1990-10-09
Hruskoci, Peter
Liquid purification or separation
Processes
Separating
210193, 210216, 210386, 210401, 210783, 100 71, 100118, 100153, B01D 33048
Patent
active
049618628
ABSTRACT:
A twin belt filter press system has an amendment such as sawdust, fed to a sludge or slurry being dewatered after the sludge/slurry has been initially dewatered in a gravity drain section to form a cake on a first porous belt. The amendment cascades into the partially dewatered cake off the first belt, allowing mixing of the cake and amendment in an essentially belt-wide drop zone so that the amendment partially and quickly desorbs the cake before the cake and amendment mixture progresses into a nip formed by the first belt and a porous second belt. The mixture subsequently is carried in a position between the belts for pressing to remove moisture from both the cake and amendment. In one embodiment a shear-minimizing mixer is arranged in the amendment drop zone to additionally mix the amendment with the cake. In a further embodiment, additional amendment may be added downstream across the belt width between downstream rollers utilizing a plate which spreads the belts divergently forming a discrete mixing chamber therebetween. A paddle-type mixer may be provided in the mixing chamber to mix the additional amendment to partially dewatered cake and earlier fed amendment. In a further embodiment, a portion of the cake/amendment mixture after pressing may be repulped with fresh liquid and recycled upstream for effecting a displacement wash.
REFERENCES:
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patent: 3951809 (1976-04-01), Kollmar
patent: 4105558 (1978-08-01), Heinrich et al.
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patent: 4595506 (1986-06-01), Kneer
patent: 4647382 (1987-03-01), Sharpe
Baker Hughes
Drodge Joseph
Hruskoci Peter
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