319 



R. H. BAILEY 

 digester liquor, 5,000 tons from this 500-ton pulp mill, 

 or 100 tons per day. 



A very rough separation is made of the 

 concentrated digester liquor by forcing it out by adding 

 cool wash waters. The thermostat-operated discharge 

 valve shuts off when the discharge becomes cooler. The 

 production of 11,000 gallons of alcohol from 65 tons of 

 fermentable sugars indicates that the feed is 65 percent 

 sulfite waste liquor and 35 percent wash water. This 

 operation has no effect toward reducing the toxic effect 

 of sulfite waste liquor on the fisheries industry. 



The other by-products call for evaporation 

 of this 65 percent solution of sulfite waste liquor to a 

 sludge, after which spray driers reduce the sludge to a 

 powder for which the pulp mill has found many uses. 

 The pulp mill produces over 5,000 tons of sulfite waste 

 liquor per day. Computed at 12 percent of solids, we have 

 600 tons of solids per day. 



The alcohol plant takes out 65 tons or 

 11 percent, and if --and the "if" is capita lized--there is 

 sufficient by-product market, these plants take out 135 

 tons or another 22-1/2 percent. 



Under these optimistic conditions, we still 

 have a discharge equivalent to that of a 330-ton sulfite 



