Paint Shops


High-quality coatings require best possible parts cleaning. Our experts for holistic and sustainable recirculation of water are specialists for this quality target. Together, we will develop a concept for the recirculation of water that combines quality, energy-efficiency and economy. We will find a solution for treating process waters and degreasing baths – challenge us!

Wastewater from paint shop pretreatment processes
Wastewater-free production, as it is called, has never been and will never be completely free of waste water. Liquid residues, which are always produced when ultrafiltration or evaporators are used, are disposed of externally as wastes. So, in a purely formal way, the remaining wastewater will become waste. Although the volume of this waste is reduced, the pollutant load released to the environment remains the same. The high concentrations, in particular of salts and heavy metals, also make the necessary treatment in external waste treatment facilities more difficult.

Energy transition requires re-evaluation and re-design of water circulation where energy-intensive processes such as ultrafiltration and evaporation are used.

We avoid the term "wastewater-free production". We close circuits where it is economically and ecologically sensible. Extreme water-saving measures lead to a loss of quality in the production process, since the use of circulated water often does not achieve reliably the same quality as the use of fresh water or demineralised water. This particularly applies to pretreatment prior to the painting process, where highest demands are placed on the cleanliness of the surfaces to be painted. Together with you, we will develop a concept for mixed water/wastewater that combines quality, energy efficiency and profitability. Treating process waters and waters from degreasing baths, which are produced during the pretreatment process, is a challenge that we accept for you.

The advantages of our wastewater treatment plants:

  • best possible separation of oils, greases, and contaminants
  • hygienically safe recirculation water thanks to UV-sterilization (optional)
  • low expense for staff and maintenance
  • low production of residues
  • low operating costs
  • small footprint thanks to compact design

We will work out the most economical mix of water, energy efficient waste water treatment and fresh water use as the basis for efficient pretreatment and thus for an optimum painting process.Thanks to our high-performance flotation plants, perfectly cleaned surfaces are generated which provide the basis for optimum adhesion of the paint.

In the field of wet coating, water-sprinkled spray booths are the first choice when it comes to medium-sized and large paint-spray lines. The overspray introduced into the water is excellenty detackified and coagulated (paint coagulation) by specialty chemicals (coagulants). Subsequently, the OKO-aquaclean flotation plants separate reliably the paint coagulate from the circulation water, thus avoiding deposits in the pipelines and in the system tank. Considering large circulation volumes, quality requirements and the use of an energy-efficient process, it is sensible to recirculate the water.

Our high-performance flotation plants work effectively and fully automated while requiring minimum space. In addition, sensor systems for identifying the polluted water and for assuring the quality of the clear water as well as possible digital networking of the plant control system provide the basis for an integration according to Industry 4.0.

Did you know that only 18 percent of water resources are used in Germany? (source: Federal Environmental Agency)

Germans are world champions in saving water. Hardly any other industrialized country consumes as little water as Germany per capita. But that was not always the case: 20 years ago, every citizen of Germany used about 147 liters of water per day. At that time, politics, business and administration assumed that daily consumption per capita in private households and industry would continue to rise. The German water supply network was therefore further expanded, as was the network of sewage treatment plants and waterworks. Thanks to water-saving technologies and a more sensitive approach to the environment, however, water consumption by private and commercial consumers has declined significantly.

Today, the daily consumption amounts to only 121 liters per capita in Germany. (Source: The use of water sank even more drastically in the industrial-commercial sector. Currently, every drop of water is used about almost six times thanks to recirculation and cascade systems. As a result, less and less water flows through the pipes. This creates an ideal breeding ground for germs and bacteria in the pipelines. Thus, the sewer network suffers considerable damage - and the immense costs for necessary refurbishments have to be financed by constantly rising fees.

The ecological and economic benefits of the water saving measures in the last decades must therefore be considered and evaluated in its entirety.

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Case study paint shops

Here you can download our case study for wastewater treatment in paint shops.