At the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR) facility in Lampoldshausen, a new solar water-cleaning system (Solare Wasserreinigungsanlage Lampoldshausen; SOWARLA) is using sunlight to remove inorganic contamination, which is rather difficult to break down, from waste water. The heart of the system is a new type of solar receiver that obtains the energy required for the removal of a variety of pollutants from solar radiation.
The Sun's rays, combined with photocatalysts, can be used to destroy pollutants dissolved in water. Many pollutants are removed from the water by this photochemical cleaning process, very efficiently and, using sunlight as the energy source, also in a very environmentally-friendly and resource-efficient way. The exceptional effectiveness of the process has been proven for many types of very problematic waste water. Pharmaceutical agents such as antibiotics, X-ray contrast media and hormones have been destroyed in waste water as securely as chlorinated hydrocarbons from polluted groundwater, harmful substances in exhaust-air scrubbing solutions from textile manufacturing or toxic materials in municipal waste water.
Full article from DLR