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HYDRAULICS IN BNR PLANTS

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There are many instances where biological nutrient removal (BNR) plants are not operating very well as a result of some oversight of the impact of hydraulics on plant design. These problems are not always apparent and the paper will highlight some common problems and the effect of these hydraulic oversights on plant operation and performance. Issues covered include the control of oxygen in the feed to the anaerobic zone, flow splitting, short-circuiting, mixing of recycle flows, mixed liquor recycle flow rates and clarifier issues. Several examples will be given of how specific hydraulic problems with BNR systems have been resolved.
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Document Type: Research Article

Publication date: 2004-01-01

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