Waste water technology

Quiet and efficient turbo blowers at Lake Constance

Startseite Industries & Applications Wastewater treatment Lake Constance: vacation destination and drinking water reservoir

Energy-efficient wastewater management for the sake of the environment

Lake Constance, also known as the Swabian Sea, is the largest inland body of water in Germany and third largest lake in Central Europe. The secret of Lake Constance is its versatility, making it known as an attractive vacation destination and recreational area. With a length of 63 kilometers, a width of 14 kilometers and a water surface of 536 square kilometers, Lake Constance is our largest drinking water reservoir. Drinking water from Lake Constance is a foodstuff of special goods: clean water from the Alps feeds Lake Constance, strict regulations for water protection keep the lake clean.

The customer of KAESER Kompressoren SE is the largest wastewater treatment plant in the northern Lake Constance catchment area. 80,000 inhabitants as well as numerous commercial and industrial enterprises discharge between 12 and 16 million cubic meters of wastewater to the treatment plant each year.

Challenge

The wastewater treatment plant is equipped with all state-of-the-art treatment stages and an additional 4th treatment stage. Thus, the wastewater association meets particularly high requirements in terms of purification performance.

Wastewater treatment plants require a lot of energy in the form of electricity and heat for wastewater purification and sludge treatment. Surely the obvious thing to do here is to utilize the waste products from the wastewater to generate energy? This means that the sewage gas from sludge digestion is reused to generate electricity. The generators of the three combined heat and power plants generate electricity and heat (waste heat) from the combustion of the sewage gas. This means, that the sewage treatment plants can be operated 100 % self-sufficiently in terms of energy.

For the biological treatment stage, which takes place in the aeration basins, ambient air is required for the healthy growth of the microorganisms working there. Previously, the air was coveyed by five rotary piston blowers from different manufacturers. Due to their age, the systems were no longer energy-efficient, extremely noisy and caused high costs due to the frequent repairs and maintenance.

Solution statement

  • KAESER used four LP8000 magnetic bearing KAESER PillAerator turbo blowers (150 kW for airflows up to 8,000 m³/h) on this project.
  • The KAESER units are characterized by their quiet operation as well as their economicial and low-maintenance design.
  • The vertically arranged drive shaft connected to the impeller causes it to float without contact in a magnetic field created by annularly arranged permanent and electromagnets.
  • Due to the dynamic magnetic bearing, the motor is oil-free, vibration-free, friction-free, wear-free and maintenance-free.

Customer value

  • By acquiring the new turbo blowers, three important goals were achieved in one fell swoop: energy efficiency, noise reduction and economy.

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