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Modeling the Effect of Inadequate Screening on Nutrient Removal

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The city of Lancaster, Pennsylvania, operates an advanced wastewater treatment plant (AWWTP). The AWWTP consists of two separate treatment plants, the North Plant and the South Plant, each consisting of primary clarification, a pure oxygen activated sludge process, and final clarification. Effluent is discharged to the Conestoga River, which flows into the Chesapeake Bay, with new annual load limits for total nitrogen (TN) and total phosphorus (TP). The final plant capacity at these new loads needed was determined using a biological model. Results showed that poor mixing in the pure oxygen process modified the conditions in the tanks resulting in more denitrification than expected. A new screenings facility will alleviate the mixing problems by removing debris, resulting in different dissolved oxygen conditions in the tanks. Optimization of the high purity oxygen process will be required to meet plant capacity.
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Keywords: Nutrient removal; high purity oxygen; modeling

Document Type: Research Article

Publication date: 2010-01-01

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