Aire-O2’s Cold Weather Legacy - Industrial Wastewater Treatment System - Ft. Frances, ON, Canada - Case Study
Bose Cascade’s Ft. Frances, Ontario kraft mill operation faced a wastewater treatment problem due to dead spots in nearly half of its aerated stabilization basin. The mill site is located in Northern Ontario, Canada, halfway between the nation’s east and west coasts.
The mills produce modified kraft mill and groundwood effluent that receives PH adjustment and nutrient supplementation before being mixed with the clarified paper mill waste stream. The solids from this combined waste stream are settled out in either of two 100 x 1500 foot primary basins. The primary basin overflow is discharged into the 80 million gallon aerated stabilization basin for secondary treatment. Residual influent and biological solids settle in a quiescent zone following aeration, prior to the wastewater being piped back to the mill site. At the mill, effluent enters a foam trap, prior to discharge through a diffuser into the Rainy River. The river flows into Lake of the Woods.
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