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Bleach plant filtrate recovery

Patent ·
OSTI ID:7212349
; ;
Acid and alkaline filtrates are separated from the bleach plant of a bleached pulp mill for use in washing unbleached pulp free from entrained pulping liquor. Acid effluent is neutralized with sodium hydroxide solution prior to use in the washing as the last washing step while alkaline filtrate is used in the remainder of the washing. Part of both the acid and alkaline filtrates are not used in the washing to allow bleed of calcium value and caustic extraction stage solids which otherwise would build up on the washed pulp mat passing to the bleach plant.
Assignee:
Erco Envirotech Ltd.
Patent Number(s):
US 4039372
OSTI ID:
7212349
Country of Publication:
United States
Language:
English

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Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
FILTRATION
INDUSTRIAL PLANTS
INDUSTRIAL WASTES
INDUSTRY
LIQUID WASTES
MANAGEMENT
MATERIALS RECOVERY
PAPER INDUSTRY
PROCESSING
RECYCLING
SEPARATION PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES