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Advanced Wastewater Treatment Testing Showdown In Henderson, Nevada

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In response to rapid service-area growth, The City of Henderson, Nevada implemented planning efforts for the next expansion of wastewater treatment capacity. As the conclusion of that planning effort prior to facility design, advanced wastewater treatment (AWT) processes were pilot tested for application as a post-biological nutrient removal (BNR) phosphorus removal method to meet strict total maximum daily load (TMDL) limits. The existing solids contact clarifiers and down-flow filters were compared, side-by-side, with pilot inclined plate gravity settler and continuous-backwash up-flow filter technology.

The results of the pilot testing indicated that the existing technology requires an alum dose of approximately 70 mg/L to maintain an adequate sludge blanket and produce effective turbidity and phosphorus removal, whether or not a BNR-treated secondary effluent is being treated. The piloted technology allows an alum dosage of approximately 20 mg/L to meet treatment goals on a BNR secondary effluent - a 70 percent savings. The economic evaluation of the two alternatives determined that the plate gravity settler and continuousbackwash up-flow filter treatment process will have at least a 13 percent lower present worth cost compared to installing additional solids contact clarifiers and down-flow filters.
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Document Type: Research Article

Publication date: 2000-01-01

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