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Characterization of simultaneous nutrient removal in staged, closed-loop bioreactors

ABSTRACT: This research was conducted in the context of an overall research project directed at better understanding and controlling simultaneous biological nutrient removal (SBNR) in full-scale wastewater treatment plants. The basic hypothesis of the overall research is that three general mechanisms are responsible for SBNR and that all three can operate, to different degrees, within any biological nutrient removal (BNR) system. The three mechanisms are (1) biological reactor (bioreactor) mixing patterns that allow the anoxic and anaerobic zones necessary for BNR to develop, referred to as the bioreactor macroenvironment, (2) the development of anoxic and anaerobic zones within the floc, ...

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