Clean air in paint technology and surface coating: challenges and solutions
While coating is running at full capacity, a pungent odor fills the air. Solvent-based coatings, drying processes, or cleaning cycles cause volatile organic compounds (VOCs) and other pollutants to accumulate in the exhaust air. Depending on the production step, the level of contamination fluctuates significantly – from short-term concentration peaks to continuous emission levels. Whether in paint technology or surface coating, harmful emissions are generated at many points along the process chain, often invisible but with noticeable effects.
The challenge lies in reliably capturing, treating, and reducing these emissions without compromising production efficiency. At the same time, requirements for environmental and occupational safety, as well as compliance with legal limits, are continuously increasing. As a result, air purification and exhaust air treatment are becoming central factors for safe, economical, and future-proof production processes in paint technology and surface coating.
Emissions throughout the entire process chain
Emissions such as VOC, overspray, solvent vapors, or fine particulate matter arise, for example, during the mixing of paints, transferring, storing, spraying, drying, coating, or cleaning. Hardly any process step is free from emissions.
Particularly in painting, powder coating operations, or industrial coating plants, there is a high level of pollutant exposure. Adjacent processes such as filling or cleaning systems also contribute to emission levels. In the printing industry, for example, pollutants are released during packaging printing and in processes such as flexographic printing, gravure printing, and offset printing. Solvent-laden exhaust air streams also arise and must be reliably treated.
Drying processes also present a particular challenge. They not only lead to increased emissions but also require high energy consumption. In combination with fluctuating production conditions, exhaust air streams with highly variable pollutant concentrations are created—posing a key challenge for designing suitable systems.
For employees, pollutant-laden exhaust air means increased workplace exposure, especially from solvent vapors and fine particles. This can significantly affect workplace safety and employee health. In addition, emissions have harmful effects on the environment. Regulations such as TA Luft or the Federal Immission Control Act (BImSchG) set clear limits for pollutant levels in industrial plants, which must be reliably met.
Technologies for exhaust air treatment in paint technology and surface coating
Various technologies are available for the treatment and reduction of emissions and pollutants in exhaust air. Depending on the application, a customized concept can be developed. Key processes include:
- Filtration to separate particles and overspray
- Adsorption to remove gaseous pollutants
- Concentration using a zeolite wheel, especially for large air volumes with low pollutant concentrations
- Regenerative thermal oxidation (RTO) for energy-efficient processes
- Catalytic oxidation (CO) for low to medium pollutant concentrations
- Regenerative thermal and catalytic oxidation (RTCO) for high heat recovery
- Thermal oxidation (TO) for applications with high or highly fluctuating pollutant concentrations
Selecting the appropriate technology depends heavily on process conditions such as air volume flow, pollutant concentration, or the type of materials used. Due to the many influencing factors, customized system design is essential. Production lines with variable pollutant loads require flexible and adaptable systems.
Cost efficiency and operational reliability through air purification
In addition to high pollutant loads, outdated exhaust air treatment systems often cause high maintenance costs, operate inefficiently in terms of energy, and frequently lead to unplanned downtime. These factors increase not only operating costs but also operational risks.
Modern air purification systems, on the other hand, enable targeted risk minimization through stable processes and high availability. With intelligent design, autothermal operation can often be achieved, where the energy contained in the exhaust air is used to sustain the process.
Realistic payback periods also play an important role in investment decisions. In addition, funding opportunities – such as those provided by BAFA, KfW, or regional funding programs – can further improve economic efficiency.
Future-proof through modern exhaust air technology
In light of increasing requirements, it is crucial to design systems that are future-proof. Modern systems must not only meet current emission limits but also allow flexible adaptation to future developments. Regulatory frameworks such as TA Luft, the EU Industrial Emissions Directive, and the Federal Immission Control Act (BImSchG) set clear conditions for operating painting and coating systems. These requirements are continuously evolving, making long-term solutions increasingly important.
Well-designed exhaust air treatment in paint technology and surface coating helps ensure compliance with legal requirements, reduce operating costs, and safeguard both employee health and the environment. Investing early in efficient and adaptable solutions—such as those offered by ETS Air Systems—lays the foundation for stable and sustainable production operations.
Would you like to learn more about our technologies for industrial exhaust air treatment or take advantage of our free initial consultation? Then get in touch with us!
Contact person: Dr. Thomas Krech
Phone: 036415594650
Email: info@ets-airsystems.com