Dave Stropky, Paul Nowak, Suqin Dong Process Simulations Ltd. Konstantin Pougatch, Martha Salcudean University of British Columbia P.S. Pagoria, W.A. Barkley, C.W. Bryant Weyerhaeuser Paper Company. CFD Predictions in Large Mechanically Aerated Lagoons. Contents. Introduction
Process Simulations Ltd.
Konstantin Pougatch, Martha Salcudean
University of British Columbia
P.S. Pagoria, W.A. Barkley, C.W. Bryant
Weyerhaeuser Paper Company
CFD Predictions in LargeMechanically Aerated Lagoons
Motivation:Improvement of lagoon performance through a deeper understanding of the hydraulics. Development of Residence Time Distribution (RTD) curves without dye studies.
Goal:Develop a 3-D Computational Fluid Dynamics (CFD) hydraulic model of a large aerated industrial lagoon.
Incorporated in Model
Throttled by DO (both) and PO4 (growth)
Grande Prairie is a >850,000 m3, two cell lagoon 5.29m deep (18ft) with an operating water depth of 4.57m (15ft) when clean. Cell 1 is 326m x 323m, and cell 2 is 326m x 312m. Cell 2 has two flow baffles. The 1997 volume flow rate is 622 l/s from the south inlet, and the 2005 flow is 632 l/s from the north inlet. Each floating aerator is 75HP and circulates 1286 l/s of liquid. The 1997 configuration has 25 aerators (18 in cell1 and 7 in cell2). The 2005 configuration has 27 aerators (19 in cell 1 and 8 in cell 2).
Vertical magnification x10
Model sludge profile estimated.
Unknown at time of dye study.