Treating digestate obtained from anaerobic digestion of organic matter to obtain e.g. liquid product used as fertilizer, by concentrating fertilizer element in nitrified liquid phase, recovering concentrate and obtaining liquid product

摘要

Treating a digestate obtained from a process of anaerobic digestion of organic matter, comprises separating digestate into a solid phase and a liquid phase, recovering and drying the solid phase, recovering the liquid phase, aerating the liquid phase to produce a nitrification reaction of ammonium nitrogen without denitrification reaction, removing suspended liquid phase material, concentrating fertilizer elements in nitrified liquid phase, recovering the concentrate and obtaining a liquid product, and adding liquid product to solid phase to be dried and obtaining a solid product. Treating a digestate obtained from a process of anaerobic digestion of organic matter, comprises separating digestate into a solid phase and a liquid phase, recovering and drying the solid phase, recovering the liquid phase, aerating the liquid phase to produce a nitrification reaction of ammonium nitrogen without denitrification reaction, removing suspended liquid phase material, concentrating fertilizer elements in nitrified liquid phase, recovering the concentrate and obtaining a liquid product, and adding all or part of the liquid product to solid phase to be dried during drying step and obtaining a solid product. Independent claims are included for: (1) the product (PL) present in the form of liquid having a pH of = 7 and comprising potassium and nitrogen in the form of nitrites or nitrates; (2) the product (PS) present in the form of solid having a solid content of greater than 50% and comprising potassium, nitrogen and phosphorus; (3) an installation for treating digestate comprising a unit for separating the solid phase and the liquid phase, a unit for recovering the solid phase, a unit for drying the solid phase, unit for recovering the liquid phase, a unit for aerating the liquid phase, a unit for removing the suspended liquid phase material, a unit for concentrating the fertilizer elements in the liquid phase, a unit for recovering the concentrated liquid phase, and a unit for adding the concentrated liquid phase to the solid phase to be dried during the drying step; and (4) use of liquid product in the treatment of digestate obtained from process of anaerobic digestion of organic matter as an agent for washing the solid phase. ACTIVITY : Fertilizer. MECHANISM OF ACTION : None given.