The Orange County Sanitation District (OCSD) located in Southern California is in the process of building a 340-mgd headworks facility. Carollo Engineers is responsible for the design of the proposed facility. As part of the design, computational fluid dynamic (CFD) modeling was completed on three areas of the proposed headworks facility: the Bar Screen Facility Inlet Structure, the Influent Pump Station Discharge Channel/Grit Basins Inlet Channels, and the Primary Splitter Structure. Utilizing a commercial CFD model, numerical models were constructed to simulate steady-state isothermal three-dimensional (3D) turbulent flow within the selected systems. The model results were used to evaluate the relative performance of the proposed design, and make adjustments, as necessary, to improve the hydraulic efficiency of the system.
Many facilities today are facing the challenges of decreasing budgets, increasing capacity needs, and increasing operating costs. The Clark County Sanitation District (District) is no exception with one of the fastest growing populations in the United States. The recent residential and tourist population explosion in the District's service area has resulted in the need for cost effective approaches to dealing with the increasing sanitation demands of the community. As the population grows, new housing developments, recreation areas, and commercial centers have been constructed in close proximity to the treatment plant. To address these issues, the District developed a "good neighbor" policy in the design of its new centralized headworks facility incorporating state-of-the-art features for maximum treatment flexibility, controlled capital expenditures, minimal operator attention, and reduced odor generation.
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