MYTHS OF NITRIFICATION TALES OFTEN TOLD THAT ARE NOT TRUE

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Abstract:

The design, construction and/or adaptation of wastewater treatment plants for nitrification have been occurring for approximately thirty years. Over this time the basic principles of nitrification have either been ignored, elaborated upon, modified and, in some cases had falsehood presented as truth. These myths about nitrification include

The required solids retention time (SRT)


The required hydraulic retention time (HRT)


That the BOD must fall to 20 mg/L before nitrification occurs


The need for two-stage treatment


The settling properties of nitrifying sludge


The allowable surface overflow rate


The mixed liquor dissolved oxygen (DO) required


The return activated sludge (RAS) flow required


These myths are examined and shown to be untrue, or at least not true in many instances, and restrict the operators' ability to produce good effluent under a variety of conditions. The paper shows a rational basis for design and a performance envelope for nitrification.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864705783858864

Publication date: January 1, 2005

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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 These proceedings are not peer reviewed.

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