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Making Chemically Enhanced Primary Clarification Work for You

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Newly installed primary clarifiers at the Blue Plains AWTP were not meeting performance goals. Several possible causes of this underperformance were identified and one major solution was implemented. Modification of EDI baffles demonstrated an improvement in maximum SORs the clarifier could handle. Stress-tests were performed on the upgraded clarifier (with modified EDI baffles) in parallel with an existing clarifier. Results showed improvement in performance due to the upgrade, especially at high-flows.

This study also developed a bench-scale testing protocol that can successfully be used for determining various operational parameters and chemical doses for CEPT. These tests are a valuable simulation tool to rapidly estimate dosing regimes for addition of iron and polymer in order to achieve desired removal efficiencies at primary clarification. This study has shown that poorly performing clarifiers can demonstrate significantly improved performance through the addition of chemicals as was demonstrated by achieving sustained performance before and during the upgrade period.
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Keywords: CEPT; Energy Dissipating Inlet; Ferric Chloride; Polymer; Primary Clarification

Document Type: Research Article

Publication date: 2009-01-01

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