C

RtliHf coneĀ»nfr*Hon

IN ATMOSPHERE

IN BULK LIQUID

RtliHf coneĀ»nfr*Hon

Direction of process

Figure 5.13 The relative concentrations of oxygen and substrate for the loading condition and RBC rotational speed as a function of location of the media.

The arrangement of multiple RBC units.

Staging of RBC media is recommended to maximize the removal of ammonium. In secondary treatment applications, three or four stages are generally provided for each stream. For small installations, four stages can be provided on a single shaft by installing three inter-stage baffles within the tank, and introducing the flow parallel to the shaft. Installations requiring two RBC units may be placed in series with a single baffle in each tank, thus providing four stages. Four or more units can be placed in series, with each unit becoming a single stage. Various schemes of staging RBC units are shown in Fig. 5.14.

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