Content area
Full Text
Partial recycling of filtrates has been achieved on an intermittent basis
Abstract: Champion International began testing its patented Bleach Filtrate Recycle (BFR[Symbol Not Transcribed]) in September 1995. Two new processes were installed to control the buildup of non-process elements contained in recycled D100 and EO filtrates. These provisions have been started up, and partial recycling of filtrates has been achieved. Described are results from the demonstration through December 1996.
Reference: Stratton. S.C. Ferguson, M. Process report on the BFRTM technology demonstration: December 1996. Pulp Paper Can. 99 (3): T82-84 (March 1998). Paper presented at the 1997 Environmental Conference of TAPPI, co-sponsored with the Technical Section, CPPA, at Minneapolis, MN, from May 4 to 7, 1997. Not to be reproduced without permission. Manuscript received February 3, 1997. Revised manuscript approved for publication by the Review Panel, December 18, 1997.
Keywords: Bleaching effluents, calcium, chlorine free bleaching, kraft pulps, North Carolina, recovering, recycling, sodium chloride, water reuse.
Champion International Corporation is currently demonstrating a patented technology whose purpose is to recover waste materials from the bleaching of kraft pulps. The demonstration project, whose purpose is to show that the BFR process is a commercially viable method for recycling ECF bleaching filtrates, is underway at Champion's Canton, NC, integrated bleached kraft mill. Facilities have been installed that enable the recycling of filtrates from the first two bleaching stages of the 600 admt/day pine bleach plant. All of the component systems have been started up. As of December 1996, partial recycling of the D100 and EO stage filtrates has been achieved on an intermittent basis.
Process Overview
The BFR Process is the result of some five years of intensive development by Champion, with support from Sterling Pulp Chemicals, Ltd. The development drew from the learning of the Effluent Free Mill operation at Thunder Bay, ON, in the 1970s and 80s. The basic tenant upon which the process was developed is to avoid the build-up of non-process elements known to adversely effect mill operations.
BFR adds two new systems to a bleached kraft mill: A chloride removal process (CRP) provides a purge of chloride and potassium from the recovery boiler precipitator ash, and a metals removal process (MRP) enables removal of scale-forming wood minerals, predominantly calcium.
Filtrates from the...