We use cookies and similar technologies on this website ("Cookies"). In order to allow their use to analyze website usage and to enhance functionality, please click on “Accept”. To change the settings and select which specific Cookies we are allowed to use, or to obtain more detailed information, please click on “Details”.




Below, you can activate/deactivate the individual technologies that are used on this website.
Consent to all

These Cookies make a website usable by providing basic functions such as page navigation, language settings, and access to protected areas. As the website is unable to function properly without them, you cannot opt out of this kind of Cookies.


These Cookies help us to improve the functionality and attractiveness of our websites, and your user experience by saving, for example, your settings, and selections as well as filters, and to recognize your device on subsequent visits.


These Cookies allow us, and the service providers (e.g. Google via the Google Analytics service) to collect and analyze information and statistics about your interaction with our website. This helps to optimize our website using the findings obtained.

Solving two problems with one solution – New RTO system from Dürr with an evaporation tower

Stuttgart, June 20, 2008 – Purification of exhaust gases via thermal oxidation is all in a day’s work for an RTO. However, a separate unit has always been required to evaporate any remaining aqueous process residues. With the introduction of Ecopure® EVA, a completely new evaporation tower design, Dürr Environmental and Energy Systems (EES) can now combine both processes – and include an auto-thermal mode that provides high energy efficiency.

The Ecopure® RTO system with an added evaporation tower proves to be the ideal solution in all branches of industry, where production exhaust gases and oil free waste water containing organic hydrocarbons occur. When the disposal of exhaust gases and liquid residues is combined in a single treatment system, energy obtained from the hydrocarbons in the exhaust air is used to evaporate the water.

In previous decades, small quantities of aqueous residues have been disposed of in Regenerative Thermal Oxidizers (RTOs) supplied by Dürr EES. But evaporation of larger volumes of waste water was not possible in the RTO systems currently on the market. Through integration of the newly developed evaporation tower Ecopure® EVA, Dürr is now able to dispose of two different waste streams simultaneously, within one plant – and needs to draw on virtually no primary energy resources to do so.

The height of the evaporation tower is selected to suit the evaporation path for individual contaminants. The tower includes a single central lance with an appropriate number of dual material nozzle heads – as an alternative option, this single lance can be replaced by several lances. Additional equipment is provided to ensure that the waste liquid is completely evaporated. 

The evaporation tower is not designed to bring about any chemical reaction, it simply evaporates the medium. However specific cases need to be assessed separately so that operating parameters are set to suit individual circumstances. Consideration of criteria such as hydrocarbon content, for example, is just as important in terms of configuration as viscosity or any preceding chemical reactions that may lead to the production of intermediate products.   

Combining the disposal of waste gases and waste water in one plant not only reduces the cost of investment; by virtually eliminating the use of primary energy sources, it also lowers operating costs.