Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste
Patent
1990-01-31
1991-03-26
Simmons, David A.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Waste paper or textile waste
162 4, 162189, 162190, 162191, 210631, 210712, 210787, 210806, 210928, D21D 500
Patent
active
050026330
ABSTRACT:
A process for the production of papermaking fiber or pulp from waste solids emanating from pulp and paper mills, particularly waste solids in process water streams containing fibrous solids that cannot be directly recycled by paper mill "saveall" devices, from pulp and paper mill process water streams conveyed by the sewerage system to wastewater treatment plant facilities, and from "sludge" emanating from the underflow of a primary clarifier or sedimentation basin at pulp and paper mill wastewater treatment facilities either before or after the "sludge" is thickened and dewatered. The process includes a defibering stage to release individual fibers from bundles, a screening stage to separate long fiber and debris from short fiber and clay, a centrifugal cleaning stage to separate debris from the long fiber, a bleaching stage to increase the brightness of the fiber, a dewatering stage to remove excess water from the pulp, a clarification stage to separate the short fiber-clay-debris from the deflibering effluent which is substantially recycled, and a biological treatment process to remove dissolved organic materials from the excess water generated which can be either discharged from the process or recycled as process water. The process produces a papermaking fiber or pulp from waste pulp and paper mill waste solids that is substantially the same quality as the papermaking fiber or pulp used by the pulp and paper mill producing the waste solids.
REFERENCES:
patent: 4405450 (1983-09-01), Selder
Dang Thi
Prime Fiber Corporation
Simmons David A.
LandOfFree
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