Anaerobic digestion of kraft mill primary sludge

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Proceedings titleEnvironmental Conference Proceedings
ConferenceTechnical Association of Pulp and Paper Institute, Environmental Conference Proceedings, 1989, Atlanta GA, USA.
Pages143148; # of pages: 6
Subjectanaerobic digestion; biodegradation; effluent; kraft; methanogenesis; sludge solubiliziation; waste treatment
AbstractMany kraft mills have a settling basin instead of a clarifier ahead of a mechanically aerated secondary treatment lagoon, to remove the suspended solids from their wastewater. Maintenance of good overall operating efficiency in a settling basin normally requires that an annual mechanical dredging be carried out to physically remove the accumulated sludge, with subsequent disposal of the air dried material to landfill. The overall process is both time consuming and expensive. A field trial has been successfully completed at the kraft mill in Espanola, Ontario which removed the accumulated cellulosic sludge from a 4.5 x 10 4 m3 capacity settling basin by an in situ anaerobic fermentation method we developed and optimized. During the fermentation, the cellulose fibres in the sludge were biodegraded and converted into soluble organic acids, methane and carbon dioxide. The anaerobic digestion process was significantly more economical than the traditional landfill method, and it did not adversely affect the environment or the mill's normal operation.
Publication date
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number21273794
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Record identifier8190bbab-b8f1-4c58-aa6d-c81ff0577777
Record created2015-01-22
Record modified2016-05-09
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