Menetelmä fosforin vähentämiseksi prosessista peräisin olevasta jätevedestä

The invention relates to a method for reducing phosphorus in a wastewater from a process, wherein the method comprises obtaining an effluent or filtrate from the process; adjusting the pH of at least a portion of the effluent or filtrate to alkaline with an alkaline agent and allowing phosphorus to be precipitated in the form of a phosphate salt; separating the precipitate to produce purified effluent or filtrate; mixing the purified effluent or filtrate with a wastewater during or prior to a wastewater treatment process to obtain a mixture having an alkaline pH, so that phosphorus is precipitated in the form of a phosphate salt; and separating the precipitate to produce wastewater having a reduced phosphorus content.