ASB Redesign for Weldwood's Hinton Expansion, 1990 Environmental Conference Proceedings
The Hinton Mill in Alberta, Canada, is being modified to increase production of softwood market pulp from 560 to 1100 t/day. Increases in wastewater BODs and temperature and a decrease in flow rate coupled with stricter discharge limits required an evaluation of the aerated stabilization basin (ASB) treatment system. The computer-based model developed by NCASI of the ASB treatment process was used to help evaluate the capacity of the system and determine what modifications would be needed. Simulation results indicated that compliance could be reliably achieved by increasing the level of aeration. Cooling of the influent wastewater was found to be unnecessary.