Regeneration of pulp liquors or effluent waste waters

DTEXTILES PAPER D21Papermaking D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS APPARATUS THEREFOR

D21C11/00Regeneration of pulp liquors or effluent waste waters

D21C11/0007Recovery of by-products D21C11/0014Combination of various pulping processes with one or several recovery systems (cross-recovery) D21C11/0021Introduction of various effluents D21C11/0028Effluents derived from the washing or bleaching plants D21C11/0035Introduction of compounds D21C11/0042Fractionating or concentration of spent liquors by special methods D21C11/005Treatment of liquors with ion-exchangers D21C11/0057Oxidation of liquors D21C11/0064Aspects concerning the production and the treatment of green and white liquors D21C11/0071Treatment of green or white liquors with gases D21C11/0078Treatment of green or white liquors with other means or other compounds than gases D21C11/0085Introduction of auxiliary substances into the regenerating system in order to improve the performance of certain steps of the latter, the presence of these substances being confined to the regeneration cycle D21C11/0092Substances modifying the evaporation, combustion, or thermal decomposition processes of black liquor D21C11/02of acid, neutral or alkaline sulfite lye D21C11/04of alkali lye D21C11/06Treatment of pulp gases Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2 D21C11/063Treatment of gas streams comprising solid matter D21C11/066Separation of solid compounds from these gases; further treatment of recovered products D21C11/08Deodorisation Elimination of malodorous compounds D21C11/10Concentrating spent liquor by evaporation D21C11/103Evaporation by direct contact with gases D21C11/106Prevention of incrustations on heating surfaces during the concentration D21C11/12Combustion of pulp liquors D21C11/122Treatment D21C11/125Decomposition of the pulp liquors in reducing atmosphere or in the absence of oxidants D21C11/127with post-combustion of the gases D21C11/14Wet combustion; Treatment of pulp liquors without previous evaporation, by oxidation of the liquors remaining at least partially in the liquid phase