Regular (approximately monthly, depending on requirements) preparation of two standardised nutrient supplements in the environmental biotechnology laboratories and their delivery to the Electrochaea pilot plant. There the supplements are used in the experimental reactor for biological methanisation (BioCat methanisation plant). The reactor is located at the Aarmatt hybrid plant of Regio Energie Solothurn in Zuchwil. The location is ideal because other nutrients such as CO2 and H2 are available at the site.