Method for recovery of wastewater residues

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

C - Chemistry, Metallurgy

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C02F 9/00 (2006.01) C02F 1/66 (2006.01) D21C 11/12 (2006.01) D21F 1/66 (2006.01) D21F 1/76 (2006.01) D21H 17/01 (2006.01)

Patent

CA 1153165

ABSTRACT OF THE DISCLOSURE According to the invention, there is proposed a method for recovery of wastewater residues containing the activated sludge biomass, fibre and rind comprising the steps of treating these with alkali solution having a con- centration of 5-80 g/l on the Na2O basis at a temperature of 20-70°C and dewatering the reaction mass 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. The proposed invention enables the recovery of wastewater resi- dues followed by utilizing these in the main production process, the resulting products being of high quality.

366027

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