Waste water technology

More flexible and efficient design of air requirements

Startseite Industries & Applications Wastewater treatment Blowers for oxygen input into the aeration basins

Blowers for oxygen input into the aeration basins

Existing air compressors have to be replaced at a municipal wastewater treatment plant with the aim of saving energy and achieving a high tolerance for short-term fluctuations in compressed air. In this project, compressed air generation should come from a single source if possible for increased plant availability.

Challenge

At a municipal wastewater treatment plant responsible for 41,000 inhabitants, the air compressor needs to be replaced.

The aim of this project was to use new machinery to achieve not only energy savings, but also greater tolerance to short-term pressure fluctuations and a wide control range that allows the entire air requirement to be covered as efficiently as possible. The pressurized air is generated centrally and distributed to the respective zones to be ventilated via a common pipeline by means of orifice regulating gates.

Solution statement

In the first step, all necessary operating data were determined. This included the time curve of the volume flow and also the operating pressure. It was determined that the greatest possible controllability and energy savings could be achieved by distributing the load over several machines with different outputs and drive types.
At a pressure difference of 560 mbar, a control range of 280 to 3150 m³/h was obtained, i.e. control range of more than 1:11.
In this project, two KAESER rotary blowers of the type KAESER DB 236C-OFC (with frequency converter) and two KAESER DB 236B-STC (with Y/D-starter) were installed.
A higher-level KAESER SIGMA AIR MANAGER (SAM) compressor control system coordinates the operation of the individual machines in the network accoding to demand and as efficiently as possible.
The KAESER SAM integrated control system has software that is specially adapted to the operating behaviour of low-pressure compressors. Via the connection to the process control system, the control system executes a sliding pressure control

Customer value

Positive conclusion of the customer in the follow-up regarding the project managment of compressed air generation as required from a single source.
The number of communication and construction interfaces was reduced accordingly. Specialist knowledge of equipment and control technology could be passed on in bundled form.
Increased availability for service cases.

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