Paper making and fiber liberation – Processes and products – Reclamation – salvage or reuse of materials
Patent
1988-10-03
1991-01-08
Chin, Peter
Paper making and fiber liberation
Processes and products
Reclamation, salvage or reuse of materials
162190, 162191, 162DIG9, 210631, 210712, 210787, 210806, 210928, D21C 1100, D21F 166
Patent
active
049832581
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 said process comprises 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 sedimentation stage to separate the short fiber-clay-debris from the defibering 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 said 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: 3740363 (1973-06-01), Fuller
patent: 3833468 (1974-09-01), Boniface
patent: 3849245 (1974-11-01), Marsh et al.
patent: 4332638 (1982-06-01), Mauer et al.
patent: 4334984 (1982-06-01), Vagac et al.
patent: 4360402 (1982-11-01), Ortner et al.
patent: 4738750 (1988-04-01), Ackel
Chin Peter
Dang Thi
Prime Fiber Corporation
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