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PRACTICAL CONSIDERATIONS FOR DESIGN OF A STEP-FEED BIOLOGICAL NUTRIENT REMOVAL SYSTEM

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Abstract:

As the need to retrofit secondary treatment plants for biological nutrient removal (BNR) has become widespread, process variations such as step-feed BNR have been developed to adapt existing treatment facilities to meet effluent requirements. Since there are relatively few full-scale installations of step-feed BNR, the process and retrofit design concepts are still under development. Although step-feed BNR has a relatively small footprint for a suspended growth process, it also is more complex than plug-flow or complete-mix regimes, and presents unique challenges to the designer. This paper discusses major design components including primary effluent flow splitting, chemical feed, dissolved oxygen carryover, nitrate recycle, and foam control; illustrates their impact on performance through process modeling examples; and shows how they are being resolved in New York, NY; Cumberland, MD; and North River, VA.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864700784544334

Publication date: January 1, 2000

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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