Slave Lake Pulp Generates Biogas, Saves Money, Paper360º November/December 2019
Slave Lake Pulp, a subsidiary of West Fraser Mills Ltd., is a 240,000 metric tpy BCTMP mill located in northern Alberta, Canada. The mill primarily processes aspen to produce market pulp for the global market.
Slave Lake Pulp generates a high-strength wastewater stream, which was previously being treated in an energy-intensive conventional activated sludge (CAS) system. The mill frequently alternates pulp brightness grades, resulting in fluctuations in the wastewater’s chemical oxygen demand (COD) concentrations from 5,000 to 19,000 mg/l. This meant that process stability and the ability to handle variations in hydraulic and organic loads were important factors when selecting an anaerobic digestion system.
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