Two Atlas Copco ZS 55+ oil-free screw blowers with variable speed drive (VSD) supply energy-efficient compressed air to process sewage at the treatment plant in Versmold, Germany. As a result of the efficiency of the VSD, the plant has achieved energy savings of 10%, which means lower sewage fees for customers.
At the end of the test run, we were actually able to determine that the blower from Atlas Copco was 10% more efficient than our other machines.
The control function is taken over in each case by an Atlas Copco ZS 55+ VSD oil-free screw blower with variable speed drive (VSD). The two machines, working together with two blowers supplied by another manufacturer, supply 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 variable speed drive.
"The blowers from Atlas Copco are compact and it is not necessary to make many modifications," compliments plant manager Khosrow Ghobadi. "The machine is simply linked to the process control system, which we did easily without any problems."
Initially, however, only one of the two tanks was equipped with a ZS+ blower, .
"We just wanted to check whether the promised increase in efficiency could be achieved,"
Ghobadi says with a grin. "At the end of the test run, we were actually able to determine that the blower from Atlas Copco was 10% more efficient than our other machines."
That’s when the second screw blower from Atlas Copco was purchased.
"Both machines have run smoothly for the past two years," Ghobadi concludes. "The only thing that we need to do is routine maintenance work."