Abstract
Quesnel River Pulp (QRP) began operating a low sludge yield biofilm activated sludge (BAS) treatment system at its bleached chemithermomechanical (BCTMP) pulp mill at Quesnel, British Columbia, in March 2005. AnoxKaldnes provided the technology. QRP upgraded the anaerobic/activat-ed sludge treatment (AST) system to allow for both increased production rates, as well as production of higher load grades of pulp. The system increased treatment capacity from 110 tons soluble chemical oxygen demand (SCOD)/day to 140 tons SCOD/day with expansion capacity to 170 tons SCOD/day. In addition, the anaerobic system capable of removing 20 tons SCOD/day could be decommissioned since it had a low tolerance for peroxide and sulfur, and high maintenance and operating costs. Results of the upgrade included: 1) meeting all permit limits and effluent is nontoxic to trout under standard test conditions, 2) 80%–85% SCOD removal, 3) stable and reliable operation, 4) sludge yields between 0.12–0.17 net kg total suspended solids (TSS)/kg SCOD removed (compared to previous yields of 0.23 net kg TSS/kg SCOD removed), and 5) ~25% decrease in total effluent treatment costs per ton of pulp, despite a 30% increase in power requirements.
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