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.
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