A semi-enclosed, brackish sea with slow water exchange through the Danish Straits into the North Sea, the\u00a0Baltic<\/a>\u00a0has more phosphorus build-up than it can handle.<\/p>\n Associate Professor Zeynep Cetecioglu, a microbiologist and wastewater engineer at KTH, says that phosphorus deposits in the muck at the bottom of the Baltic can be released and recovered in a controlled and efficient way.<\/p>\n The study describes a two-step approach, using\u00a0microbes<\/a>\u00a0to loosen phosphorus from sediment and then adding a compound that binds metals to further release the phosphorus so it can be captured and turned into a usable product, such as fertilizer.<\/p>\n “Phosphorus is a critical agricultural nutrient and Europe imports a large amount of it,” Cetecioglu says. “This new method to reclaim phosphorus from sediments could reduce dependence on imported phosphate rock.”<\/p>\n In controlled lab tests, the process loosened 80% of the phosphorus contained in sediment and the researchers were able to recover 99% of that. The team reports that in this setting they also saw the abundance of beneficial microbes increase dramatically.<\/p>\n Cetecioglu stresses that the method is not ready for direct use in the sea. Further development will be needed, she says. For example, in order to avoid harming marine ecosystems, the process would have to take place in enclosed, land-based facilities where sediments are treated safely and no chemicals or microbes escape.<\/p>\n![\"\"](\"https:\/\/www.fie.undef.edu.ar\/ceptm\/wp-content\/uploads\/2026\/02\/method-to-extract-balt-1.jpg\")