Foto de stock - 10 September 2021, Brandenburg, Brandenburg/Havel: A large-scale experimental plant (l) for the removal of phosphorus is located on the site of the Briest sewage treatment plant of Wasser- und Abwassergesellschaft Brandenburg GmbH (BRAWAG). A combination of phosphate precipitation and post-treatment by means of sand filtration is intended to reduce the proportion of phosphorus and its compounds in the already purified water. In this process, the chemical element is converted by precipitation into large flakes, which are then separated out in a special sand filter and sucked out by a mammoth pump. The phosphorus can be recovered from the precipitated sludge. The project, entitled ""Zero-P"", is a cooperation between BRAWAG, Nordic Water and is funded by the German Federal Ministry of Education and Research. Photo: Soeren Stache/dpa-Zentralbild/ZB. - Brandenburg/Havel/Brandenburg/Germany