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Simple Retrofitting for Phosphorus Removal and Its Impact on Plant Performance at the John E. Egan Water Reclamation Plant

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A full-scale demonstration study in the receiving water of the John E. Egan Water Reclamation Plant required the plant to reduce total phosphorus concentrations in its final effluent to 0.5 mg/L. To expedite the retrofit and minimize the capital cost for phosphorus (P) removal, chemical P removal through simultaneous precipitation with ferric chloride (FeCl3) was selected. Storage tanks and metering pumps for adding FeCl3 were designed and constructed without interrupting the normal plant operation. After twelve months operation of P removal, it was shown that the addition of FeCl3 to the mixed liquor for removing P to the 0.5 mg/L level had little adverse impact on the quality of final effluent. However, some influence on other unit processes in the plant due to chemical P removal was observed. The results of P removal and impact on other unit processes will be presented and discussed in the paper.
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Document Type: Research Article

Publication date: 01 January 2008

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