We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

We have a new identity for the Atlas Copco Group

The Atlas Copco Group logo on a white background

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Enabling the transformation to a low-carbon society

Fully committed to being part of the solution for a better tomorrow, we have set science-based targets to reduce greenhouse gas emissions in line with the goals of the Paris Agreement.
Thumbnail image for a video introducing our science-based targets

Are you up for a challenge?

Join us on an interactive journey to learn more about our culture.
Atlas Copco colleagues in discussion.

Are you up for a challenge?

Join us on an interactive journey to learn more about our culture.
Atlas Copco colleagues in discussion.

Are you up for a challenge?

Join us on an interactive journey to learn more about our culture.
Atlas Copco colleagues in discussion.

Are you up for a challenge?

Join us on an interactive journey to learn more about our culture.
Atlas Copco colleagues in discussion.

Are you up for a challenge?

Join us on an interactive journey to learn more about our culture.
Atlas Copco colleagues in discussion.

Innovation stories

Do you want to learn about our innovations? How operators benefit from our ergonomic equipment or how we secure a minimal impact on the environment?
Corporate people observing parts of products in the field, cover image, ideas, backlight, touch screen

Innovation stories

Do you want to learn about our innovations? How operators benefit from our ergonomic equipment or how we secure a minimal impact on the environment?
Corporate people observing parts of products in the field, cover image, ideas, backlight, touch screen

Innovation stories

Do you want to learn about our innovations? How operators benefit from our ergonomic equipment or how we secure a minimal impact on the environment?
Corporate people observing parts of products in the field, cover image, ideas, backlight, touch screen

Innovation stories

Do you want to learn about our innovations? How operators benefit from our ergonomic equipment or how we secure a minimal impact on the environment?
Corporate people observing parts of products in the field, cover image, ideas, backlight, touch screen

Innovation stories

Do you want to learn about our innovations? How operators benefit from our ergonomic equipment or how we secure a minimal impact on the environment?
Corporate people observing parts of products in the field, cover image, ideas, backlight, touch screen

Our annual Industrial Ideas magazine

features stories about how we innovate for a sustainable future and push technology and society forward together with our customers.
Atlas Copco's Industrial Ideas magazine

Our annual Industrial Ideas magazine

features stories about how we innovate for a sustainable future and push technology and society forward together with our customers.
Atlas Copco's Industrial Ideas magazine

Our annual Industrial Ideas magazine

features stories about how we innovate for a sustainable future and push technology and society forward together with our customers.
Atlas Copco's Industrial Ideas magazine

Our annual Industrial Ideas magazine

features stories about how we innovate for a sustainable future and push technology and society forward together with our customers.
Atlas Copco's Industrial Ideas magazine

Our annual Industrial Ideas magazine

features stories about how we innovate for a sustainable future and push technology and society forward together with our customers.
Atlas Copco's Industrial Ideas magazine
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Atlas Copco centrifugal compressors supply deep sedimentation tanks with high-pressure air

September 10, 2015

Industries:
Other
Topics:
Energy efficiency
Geography:
Europe

The sewage treatment plant in Putzhagen, Germany, requires large quantities of high-pressure compressed air for its exceptionally deep sedimentation tanks.

SONY DSC

Control room sewage treatment

Three ZB 130 VSD centrifugal compressors with magnetic bearings and variable rotation speed and two older single-stage screw compressors supply the compressed air for the biological process that occurs in the tanks. Each year, the plant treats an average of between 6.5 and 7 million m³ of sewage water. "The biological process takes place in eight tanks that are sub-divided into four lines," explains Reinhard Schweinforth, Sewage Water Technician. The tanks are 10 m high with a water depth of 8.5 m. "These dimensions are unusual for sewage treatment plants," says Schweinforth. Tanks are normally 4 to 5 meters deep. The biological cleaning processes are carried out in the eight aeration tanks. The air required for this procedure is blown into the tanks from below via diaphragm tube aerators — an energy-intensive process that accounts for 40% of the plant's entire power consumption.

An investment in energy efficiency and ease of maintenance compressors.

The compressed air required for the biological process was previously provided by five single-stage screw compressors. Because these aging compressors needed to be completely overhauled at great cost, the search for a new energy-efficient solution began. Centrifugal compressors with magnetic bearings were deemed to be the best option because a comparatively high pressure is required for the exceptional depth of the tanks.

We are able to produce higher pressures with the centrifugal compressors than we were previously able to with the screw compressors," explains Schweinforth. "We have purchased the new compressors with the aim that the machines will now be more energy efficient and easy to maintain," says plant manager Karl-Heinz Schröder. "Now that we are using the centrifugal compressors from Atlas Copco, we are saving around EUR 15000 each year on maintenance, energy and resources compared with screw compressors.

Oil-free compressed air as required

The three speed-regulated centrifugal compressors generate between 2500 and 7500 Nm³ of oil-free compressed air per hour depending on the amount of sewage water and the polluting load. The interaction is engineered by the ES 130 master control system from Atlas Copco. The process control system determines the air requirement on the basis of the oxygen content in the tanks.

At the moment, we are still using a constant pressure regulator," says Schröder. "Our next goal is to optimize this regulatory process and integrate a variable pressure regulator. Up to now, we have wasted a lot of energy as we have been operating against closed gate valves at a constant pressure of 1020 millibar. With the variable pressure regulator in place, all eight gate valves are linked and the pressure can be adjusted in line with demand, thereby enabling us to reduce the pressure used.

Written by Michael Gaar

ZB 130 VSD centrifugal compressors Screw compressors Europe Energy efficiency Centrifugal compressors Germany Other