Reducing pulp mill liquid discharge

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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162 29, 162 31, 162DIG8, 60648, 159 49, 159 473, 159DIG8, D21C 1112

Patent

active

053804023

ABSTRACT:
A pulp mill has zero or minimum liquid discharges. The large amounts of liquid that must be processed to achieve this result are handled utilizing a multiple effect evaporator provided with heat from a steam exhaust of a condensing type steam turbine. Super heated steam from the recovery and bark boilers is fed to the turbine to generate electricity for the production of bleaching chemical and other uses in the mill. Three or four steam exhausts having different composite temperature and pressure values are taken from the turbine and used where most suitable in the pulp mill. For evaporation of bleach plant effluent the steam taken from the turbine preferably has a pressure of about 1-3 psia and a temperature of about 120.degree.-140 .degree. F, and has no significant adverse affect on power generation.

REFERENCES:
patent: 2258401 (1941-10-01), Badenhausen
patent: 4405418 (1983-09-01), Takemura
patent: 5116595 (1992-05-01), Scribner et al.
W. Howard Rapson, "The Effluent-Free Bleached Kraft Pulp Mill", Tappi, vol. 56, No. 9, Sep. 1973, pp. 112-115.
Jaakko Poyry "Closing Up the Bleach Plant".
Paul Conner, "A Cogeneration Study Considering Electric Rates Resulting from PURPA", Tappi, Aug. 1984, pp. 54-57.

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