Method for removing color-imparting contaminants from pulp and p

Details Method for removing color-imparting contaminants from pulp and p Method for removing color-imparting contaminants from pulp and p

1992-11-25

1995-01-03

Nessler, Cynthia L.

Liquid purification or separation

Processes

Ion exchange or selective sorption

210691, 210694, 210908, 210909, 210917, 210928, C02F 128

Patent

active

053783670

ABSTRACT:
A method for treating a pulp and paper manufacturing stream to remove colorants therefrom comprises: contacting the stream with a first adsorbent comprising the calcined product of a compound having the formula: A.sub.w B.sub.x (OH).sub.y C.sub.z.nH.sub.2 O, wherein A represents a divalent metal cation; B a trivalent metal cation; C a mono- to tetravalent anion; and w, x, y, z and n satisfying the following: 0<z.ltoreq.x.ltoreq.4.ltoreq.w.ltoreq.1/2y and 12.gtoreq.n.gtoreq.1/2(w-x); then contacting the stream with a second adsorbent consisting essentially of activated carbon. On a preferred basis, the first contacting adsorbent is a hydrotalcite derivative made by reacting activated magnesia with an aqueous solution of aluminate, carbonate, and hydroxyl anions before calcining at one or more temperatures between about 400.degree.-650.degree. C. There is further disclosed means for removing dioxins and adsorbable organic halogens, especially chlorinated phenols, from waste water solutions using the aforementioned combination of adsorbents.

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