Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1986-02-10
1988-04-19
Chin, Peter
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 31, 162189, 210631, 210703, 210704, 210705, 210711, 210769, 210928, D21C 1100, C02F 900
Patent
active
047387505
ABSTRACT:
A system and method for converting pulp and paper mill waste water into a decolored, neutral pH effluent and a solid suitable for use as fuel in a furnace. The treatment system is used following primary and secondary treatment of pulp and paper mill waste waters typically found in the industry. After secondary biological treatment, the waste waters are pumped to a coagulation tank where the waste water is brought in contact with a polyamine coagulant which coagulates lignins, degraded sugars, and other compounds which typically discolor this water. The coagulation particles are increased in size by addition of an acrylamide polymer in a flocculation tank to improve the hydrophilic characteristics of the coagulant. The waste water is then mixed a dissolved air and water solution under pressure. Upon dissolution of the dissolved air at atmospheric pressure the air is absorbed by the flocculated matter in the aeration tank and the flocculated matter is caused to migrate towards the area of less pressure, i.e. the surface of the tank. The flocculated matter accumulates on the surface of the flocculating tank and can be skimmed from the top, dried and ultimately burned in a furnace.
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Kisla et al, "Color Removal from Softwood Kraft Pulp Bleach Plant by Polyamines", Environmental Sci. & Tech., vol. 12, No. 2, Feb. 1978, pp. 207-211.
Jordan Assoc., "Waste Water Treatment and Disposal Options" Feasibility Study for Continental Forest Ind., Nov. 24, 1982, pp. B-11-B-38.
Chin Peter
Stone Container Corp.
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