The internationally active SILOXA AG has always been on the road to increasing the profitability of plants for the use of biogas, sewage gas and landfill gas with innovative products. Siloxa's customers, founded in 1998, include private and municipal plant operators, operating companies, municipalities as well as well-known planning offices and plant builders. In the neighboring countries, there are alliances with local sales partners. The hallmark of SILOXA is the development and production of innovative solutions for gas treatment with a high production depth. SILOXA convinced in 2000 with the installation of a gas purification at the Cologne-Rodenkirchen sewage treatment plant. At the time, the Stadtwerke Cologne set up the first European-wide fuel-cell-based fuel-fired power plant based on sewage gas. The SILOXA technology allowed the use of the fuel cell by "total gas purification". A current innovation example is the cooling of biogas plants. During this cooling process, the biogas, which is generated in the fermenter of the biogas plant, is cooled down only by the ambient air. This process reduces the costs compared to conventional refrigerators by up to 75 percent, for almost half of the year it is colder than 11 ° C in our Central European latitudes, and no 20 ° C outside temperature is reached in 91 percent of the hours of the year. Precisely this temperature profile makes the cooling process so successful.