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Sludge Blanket Response to Storm Surge in an Activated‐Sludge Clarifier
Aspects of operation and design for storm flows at a 190‐m3/h (1.2‐mgd) dry weather design flow activated‐sludge plant were tested. A significant plant enlargement allowed recycle of test clarifier effluent to the main plant versus discharge to a stream. Thus it was possible to test high overflow rates without risk of a permit violation. On‐line monitoring showed that the return sludge concentration increase lagged approximately 1 hour behind the start of the storm flow. This required an adjustment of the power equation model used. Furthermore, when the overflow rate exceeded the settling velocity of the feed solids, the sludge blanket rose faster than the model prediction. This phenomenon required developing a new model to predict blanket behavior under various loading conditions. The new model allows for plant design to more accurately include a clarifier zone for storing solids during peak flows associated with rain storms. An exponential equation, fitted to settling data, was also used in the new model with test data for comparison. The exponential equation gave a low blanket prediction. Results are compared with those of other research for solids storage during peak flow.
Sludge Blanket Response to Storm Surge in an Activated‐Sludge Clarifier
Aspects of operation and design for storm flows at a 190‐m3/h (1.2‐mgd) dry weather design flow activated‐sludge plant were tested. A significant plant enlargement allowed recycle of test clarifier effluent to the main plant versus discharge to a stream. Thus it was possible to test high overflow rates without risk of a permit violation. On‐line monitoring showed that the return sludge concentration increase lagged approximately 1 hour behind the start of the storm flow. This required an adjustment of the power equation model used. Furthermore, when the overflow rate exceeded the settling velocity of the feed solids, the sludge blanket rose faster than the model prediction. This phenomenon required developing a new model to predict blanket behavior under various loading conditions. The new model allows for plant design to more accurately include a clarifier zone for storing solids during peak flows associated with rain storms. An exponential equation, fitted to settling data, was also used in the new model with test data for comparison. The exponential equation gave a low blanket prediction. Results are compared with those of other research for solids storage during peak flow.
Sludge Blanket Response to Storm Surge in an Activated‐Sludge Clarifier
Manning, William T. Jr. (author) / Garrett, M. Truett Jr. (author) / Malina, Joseph F. Jr. (author)
Water Environment Research ; 71 ; 432-442
1999-07-01
11 pages
Article (Journal)
Electronic Resource
English
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