Energy efficiency at German sewage treatment plant improved with screw blowers

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Atlas Copco ZS 55+ oil-free screw blowers with variable speed drive

WILRIJK, BELGIUM, Aug. 4, 2014 -- In an effort to supply energy-efficient compressed air to process sewage at a treatment plant in the town of Versmold, Germany, two Atlas Copco ZS 55+ oil-free screw blowers with variable speed drive (VSD) have been installed. As a result of the efficiency of the VSD, the plant has achieved energy savings of 10 percent, which means lower sewage fees for customers.

The plant cleans around 3 million gallons of sewage water every year. Sixty percent of this comprises industrial sewage, and the remainder is domestic sewage from Versmold. Specific to the plant is the high proportion of industrial customers from the meat processing industry, which generates varying rates of high polluting loads and above-average quantities of phosphate that are a challenge for the plant to handle.

Accordingly, the cleaning technology, the measuring technology, the process control system, and the compressed air technology must be able to quickly detect the pollution level of the sewage water and respond accordingly.

Nitrification and denitrification take place simultaneously in two aeration tanks. In the course of the aerobic degradation processes, the biological process is first supplied with oxygen via the plate aerators. During the subsequent anaerobic phase, only the tank contents are mixed together. Each of the tanks is supplied with oxygen via the blowers.

The control function is taken over in each case by the Atlas Copco screw blowers. The two machines, working together with the blowers supplied by another manufacturer, provide compressed air between 1,500 and 3,500 m³/h with a target excess pressure of 500 mbar to maximum 600 mbar. The volume flow is automatically adjusted to the exact air demand by the VSD.

See also:

"UK water utility's energy, costs to be reduced with screw blower technology"

"Atlas Copco honored by prominent publications for commitment to innovation and sustainability"

About Atlas Copco

Atlas Copco is a provider of sustainable productivity solutions. The Group serves customers with innovative compressors, vacuum solutions and air treatment systems, construction and mining equipment, power tools and assembly systems. Atlas Copco develops products and services focused on productivity, energy efficiency, safety and ergonomics.  The company was founded in 1873, is based in Stockholm, Sweden, and has a global reach spanning more than 180 countries. In 2013, Atlas Copco had revenues of BSEK 84 (EUR 9.7 billion) and more than 40000 employees. For more information, visit


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