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Simpler controls without a variable-frequency drive are also possible. If, for example, two identical Tyr rotary lobe blowers are used to aerate an aeration tank, these are designed in such a way that, together, they generate a volume flow designed for the highest dirt load. The Schlammersdorf-Vorbach wastewater treatment facility in the Upper Palatinate region of Germany, for example, uses two Tyr rotary lobe blowers. Both blowers can be operated at two different speeds. Depending on the oxygen supply required, they can run at full speed or at half speed. This allows operation without frequency control with four levels of volume flow, which enables further energy savings.
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