Method for recovery of wastewater residues

Details Method for recovery of wastewater residues Method for recovery of wastewater residues

1982-08-20

1984-11-06

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Including recovery of organic by-product

162 3011, 162 35, 162 37, 162 38, 162DIG9, 210737, 210928, D21C 1104

Patent

active

044810725

ABSTRACT:
A method for recovery of wastewater residues containing the activated sludge biomass, fibre and bark comprising the steps of treating these with alkali solution having a concentration of 5-80 g/l on the Na.sub.2 O basis at a temperature of 20.degree.-70.degree. C. and dewatering the reaction mixture obtained, the alkali filtrate decanted containing the activated sludge alkali hydrolysis products being used to dissolve the melt in the course of preparing the alkali pulping liquor, and the dewatered alkali mass being added, in an amount of up to 40 percent by mass, to the fibred mass composition for the manufacture of cardboard and wood-fibre board.

REFERENCES:
patent: 3841962 (1974-10-01), Procter et al.
patent: 4256630 (1981-03-01), Fremont
Obst et al, "Effect of Quinones and Amines on the Cleavage Rate of .beta.O-4 Ethers in Lignin During Alkaline Pulping"; TAPPI, Jul. 1980, p. 111.

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