To assess performance and evaluate alternatives to improve the efficiency of rectangular Gould II type FSTs, NYCDEP and City College of NY developed a 3D computer model depicting the actual structural configuration of the tanks and the current and proposed hydraulic and solids loading
rates. Fluent 6.3.26™ was the base platform for the computational fluid dynamics (CFD) model, for which submodels of the SS settling characteristics, turbulence, flocculation and rheology were incorporated. This was supplemented by field and bench scale experiments to quantify the coefficients
integral to the submodels. The 3D model developed can be used to consider different baffle arrangements, sludge withdrawal mechanisms and loading alternatives to the FSTs. Flocculation in the front half of the rectangular tank especially in the region before and after the inlet baffle is one
of the vital parameters that influences the capture efficiency of SS. Flocculation could be further improved by capturing medium and small size particles by creating an additional zone with an in-tank baffle. This was one of the methods that were adopted in optimizing the performance of the
tank where the CCNY 3D CFD model was used to locate the in-tank baffle position. This paper describes the development of the flocculation sub-model followed by the usage of this model to optimize effluent SS quality
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