Technical Bulletin No. 0050: Experimental Chemical Treatments for Kraft Mill Wastes

At the request of various Council Technical Committees, the enclosed report regarding color reduction by chemical treatment was prepared by Mr. W. A. Moggio, the Council's Resident Engineer at Louisiana State University. It appears from the data contained therein that while the color of kraft effluents can be reduced to a high degree by the application of various coagulants, the quantities required are excessive and the sludge produced highly hydrous and not dewaterable by existing methods. Research is at present directed toward improving the lime precipitation method which holds the most promise. Two large kraft mills are carrying on pilot plant development projects employing this technique. Their studies are coordinated with the Council project at Louisiana State University which is concerned with laboratory research on various aspects of the process.