With a biotechnological process for recovering critical metals from industrial wastewater, Siderogain transfers a biotech process from research to business. At the heart of the process is a patented technology that efficiently recovers strategically important metals such as gallium, indium, and germanium from process residues in the semiconductor industry. The spin-off originated in the biotechnology department of the Helmholtz Institute Freiberg for Resource Technology (HIF) at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).