Performance, Precision, Partnership

Rotary Screw Blowers For Wastewater Treatment Applications

Energy efficiency is becoming an ever more important factor in wastewater treatment. Whilst keeping this point in mind, the treatment plant at Lüneburg also wanted a solution capable of delivering a stable supply of air under fluctuating weather conditions – combined with a sophisticated control system. The answer was an HPC KAESER rotary screw blower, which in addition to a clear reduction in energy costs, provided precisely the results they were looking for.

The wastewater treatment facility at Lüneburg, in the German state of Lower Saxony, is designed to cater for the needs of around 325,000 inhabitants. It features a number of clarification tanks with depths of up to 7 m, into which the air required for the biological treatment procedure is delivered via a diaphragm control valve.

Until recently, four classic turbo blowers, each equipped with a 200 kW motor, were used to provide the compressed air for this aeration system. However, the operator was looking for a solution that would enable them to control compressed air production in a more direct and dynamic fashion, with a broader control range. They also sought to achieve a more constant air delivery that would remain unaffected by extreme weather conditions.
By measuring and documenting the air mass flow generated and the associated power consumption, the impact of installing the new rotary screw blower very soon become apparent.

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