The world-renowned AirPrex® process was developed in 2006 through several years of trials at the Berlin-Waßmannsdorf wastewater treatment plant and implemented in a full-scale plant in 2011. From here, the success of the process started, which has since been installed at numerous wastewater treatment plants in Germany, China, USA, and other parts of the world. CNP secured the rights to the process and is building them worldwide.