The City of Tracy's Wastewater Treatment Facility (WWTF) in California is a nine million gallon per day (mgd) facility that operates as a trickling filter/air activated sludge system. The WWTF is located about 60 miles Southeast of San Francisco and discharges secondary effluent into the Sacramento/San Joaquin Delta which provides a source of drinking water for about onethird of California's 30 million population. The City of Tracy is one of the fastest growing cities in the California Central Valley, and similar to other cities and municipalities, it is faced with ever increasing and more stringent NPDES permit conditions.Outside of having to increase the WWTF capacity from 9 mgd to 16 mgd as a result of anticipated growth, the City of Tracy is currently confronted with numerous new regulatory drivers forcing upgrades and changes. The current NPDES permit requires an effluent BOD and TSS concentration limit of 20 mg/L, no effluent ammonia, turbidity, or nitrogen limits apply. More stringent NPDES permit requirements are anticipated to go into effect in January of 2006, and include an effluent BOD and TSS limit of 10 mg/L, as well as effluent ammonia, nitrate, and turbidity limits of 0.5 mg/L, 10 mg/L, and 2 NTUs respectively. Phosphorus removal and effluent cooling are also anticipated for the long term.Process and technology drivers result in additional project objectives. The City of Tracy was looking to expand and integrate facilities having the latest technological advantages. Some of these technologies include fine screening, primary effluent equalization, anoxic selectors, and tertiary filtration. It was also the City's desire to provide a process with flexibility for future implementation of phosphorous removal and to provide infrastructure that could produce Title 22 reuse water in part to mitigate potential thermal load limits.Innovative design approaches, including the use of extensive process modeling and cutting edge technology utilizing total facility 3-D CAD modeling were used to meet the overall project objectives. The process model was calibrated and used to predict the performance of a two-pass aerobic and anoxic selector system designed to remove ammonia and nitrogen. 3-D CAD modeling with interactive review capabilities was used to model an integrated aeration basin, gallery, and tertiary filtration complex. The process and interactive 3-D models served as a roadmap for the design team during an evolving NPDES permit renewal process. The models were used to interactively evaluate and communicate the functional and technical complexity of the process that the City and design team were challenged with in meeting its objectives.This presentation highlights the advanced process modeling capabilities, the utilization of the modeling effort to identify innovative design approaches, the implementation of innovative technologies to achieve objectives, the utilization and integration of existing infrastructure to achieve objectives, and the use of interactive 3-D modeling to complete the design of one ...
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