Paper making and fiber liberation – Processes and products – Reclamation – salvage or reuse of materials
Patent
1998-03-09
2000-06-06
Fortuna, Jose
Paper making and fiber liberation
Processes and products
Reclamation, salvage or reuse of materials
162 55, 162 29, 162 60, 162 47, 162 44, 159 473, 210650, 210652, D21F 166, D21C 902, D21C 170
Patent
active
060713801
ABSTRACT:
A method of papermaking having zero liquid discharge. A pulp slurry is produced from recycled cellulosic material and the slurry contains suspended cellulosic fiber material, solid contaminants and dissolved water soluble solids. The pulp slurry is subjected to a cleaning operation to produce a first flow stream containing the cellulosic fiber material and dissolved solids and a second flow stream containing dissolved solids along with solid contaminants. The first flow stream is washed with water to remove a substantial portion of the dissolved solids and provide a washed pulp which is used in a papermaking machine to produce a paper sheet. The second flow stream from the cleaning operation is compacted to produce a solid residue that can be landfilled and a liquid residue containing dissolved solids that can be recycled to the pulp cleaning operation. In a modified form of the invention, the liquid residue from the compaction can be subjected to a process, such as evaporation, to provide a solid residue and a purified water or condensate which can be used in the papermaking machine.
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Fortuna Jose
Hoffman Environmental Systems, Inc.
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