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BNR/ENR treatment plants are impacted by wet weather storm flow events, which can have a significant impact on plant performance. Impacts include redistribution of process biomass, reduced contact time and secondary clarifier solids washout and significant changes in the influent wastewater characteristics. Five generic strategies are implemented in the wastewater treatment industry to deal with wet weather storm flow events:

Diversion and storage of excess storm flow, typically in side-stream equalization tanks.

Modification of the wastewater feed pattern to the BNR/ENR aeration tanks.

Adjustment to the operating mode of the BNR/ENR aeration tanks to better suit the peak flow conditions.

Manipulation of the process biomass storage and inventory.

Diversion of wastewater flow around the BNR/ENR aeration tank/secondary system with/without treatment, before blending back into the mainstream flow.

These strategies are typically implemented in some combination on a plant specific basis, dictated by local considerations of:

Retention of solids inventory.

Maintenance of the microbial population in a healthy and viable state.

Achievement of a desired level of treatment.

Prevention of overflows and decants.

The paper discusses wet weather treatment using referenced treatment plants and presents a generic decision model for the selection of the appropriate wet weather management strategies.
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Document Type: Research Article

Publication date: 2007-01-01

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