IMPROVED METHOD FOR RECOVERING PHOSPHORUS FROM SLUDGE AND PLANT THEREOF

摘要

A method, and an installation thereof, for recovering phosphorus from sludge to be treated, said method including:a stage of pre-acidification of said sludge to be treated including a step of adding an acid, preferably carbon dioxide into said sludge to be treated;a stage of bio-acidification including a step of acidogenesis and carried out in a reactor having a hydraulic retention time comprised between 1 day to 8 days and, wherein the acidified sludge has a pH comprised between 3.5 to 5.5 ; anda stage of treatment including: a step of solid/liquid separation; anda step of recovery of phosphates in liquid phase by sorption and/or crystallization, giving a phosphorus depleted water.