A method for decomposing struvite comprises dissolving of a feed material comprising struvite in a mineral acid. Thereby a solution having an acid pH is formed. Magnesium is removed from the solution. The removing of magnesium comprises increasing a pH of the solution to a pH in the range of 4.5 to 6, precipitating magnesium compounds that do not comprise ammonium, and separating the precipitated magnesium compounds from the solution. Thereby, the solution, after the removing of magnesium, comprises an ammonium salt of the mineral acid. An arrangement for performing such a method is also disclosed. Also, a method and arrangement for recovering at least nitrogen from waste material, based on the decomposing of struvite are disclosed.

A method for decomposing struvite comprises dissolving of a feed material comprising struvite in a mineral acid. Thereby a solution having an acid pH is formed. Magnesium is removed from the solution. The removing of magnesium comprises increasing a pH of the solution to a pH in the range of 4.5 to 6, precipitating magnesium compounds that do not comprise ammonium, and separating the precipitated magnesium compounds from the solution. Thereby, the solution, after the removing of magnesium, comprises an ammonium salt of the mineral acid. An arrangement for performing such a method is also disclosed. Also, a method and arrangement for recovering at least nitrogen from waste material, based on the decomposing of struvite are disclosed.

A method for producing a poultry litter-based fertilizer by a) supplying poultry litter to a rotating rotary drum, b) adding acid or a source of acid to the rotating rotary drum, wherein acid reacts with the poultry litter to form an acidified mixture, c) adding ammonia or a source of ammonia to the rotating rotary drum, d) drying and cooling the ammoniated product by evaporation of water to form a dried, cooled product in a free-flowing semi-solid or solid form, repeating the steps b) through d) until a desired nitrogen content is reached in the poultry litter-based fertilizer.

A method for producing a poultry litter-based fertilizer by a) supplying poultry litter to a rotating rotary drum, b) adding acid or a source of acid to the rotating rotary drum, wherein acid reacts with the poultry litter to form an acidified mixture, c) adding ammonia or a source of ammonia to the rotating rotary drum, d) drying and cooling the ammoniated product by evaporation of water to form a dried, cooled product in a free-flowing semi-solid or solid form, repeating the steps b) through d) until a desired nitrogen content is reached in the poultry litter-based fertilizer.

A system and method for providing fertilizer for crop production in an aqueous solution comprising nano-sized fertilizer particles, which are free of any chemical side chain and free any micelle to protect the nano-sized particle from re-agglomeration, suspended therein for improved uptake by the population of the crop.

A method for processing liquid manure 1, in particular cattle manure, comprising: supplying the liquid manure 1, separating 2 the solid parts 14 in the manure from the liquid part 3, treatment of the liquid part 3 by: adding Magnesium Chloride 5 to convert Phosphates in the liquid part into Struvite, and inserting air 6, increasing the pH level in the liquid Struvite 7 by Lime injection 9 to convert the Ammonium into Ammonia, adding Hydrochloric acid 12 to convert Ammonia into Ammonium Chloride, separating Phosphor and Nitrogen containing components from the resulting liquid 18 by reverse Osmose 17, mixing 13 the separated Phosphor and Nitrogen containing components 16 with the precipitate Struvite 15 and solid parts 14 resulting from the separation process 2 to get fertilizer 22, neutralizing 20 the remaining liquid 19 to get clean water 21.

A method for processing liquid manure 1, in particular cattle manure, comprising: supplying the liquid manure 1, separating 2 the solid parts 14 in the manure from the liquid part 3, treatment of the liquid part 3 by: adding Magnesium Chloride 5 to convert Phosphates in the liquid part into Struvite, and inserting air 6, increasing the pH level in the liquid Struvite 7 by Lime injection 9 to convert the Ammonium into Ammonia, adding Hydrochloric acid 12 to convert Ammonia into Ammonium Chloride, separating Phosphor and Nitrogen containing components from the resulting liquid 18 by reverse Osmose 17, mixing 13 the separated Phosphor and Nitrogen containing components 16 with the precipitate Struvite 15 and solid parts 14 resulting from the separation process 2 to get fertilizer 22, neutralizing 20 the remaining liquid 19 to get clean water 21.

The present invention relates to separation methods and systems for converting high concentrations of animal wastes into useful products, wherein the separation of the desired useful products is conducted with a cross-flow filtration system having the ability to the separate desired useful energy and/or products from both viscous and non-viscous medium.

The present invention relates to separation methods and systems for converting high concentrations of animal wastes into useful products, wherein the separation of the desired useful products is conducted with a cross-flow filtration system having the ability to the separate desired useful energy and/or products from both viscous and non-viscous medium.

A method of removing phosphates from water in a continuous process, the method comprising the steps of: (a) passing the water through a first zone in which the pH is adjusted; and (b) passing the water through a second zone in which the water is contacted with magnesium ions; wherein the water is contacted with ammonia in the first zone and/or in the second zone.