TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Components: The fecal reactor is further provided with a unit for venting off gases produced during the treatment of fecals with oxidizing acid, and a stirrer. The fecal reactor through the venting unit is connected to a vacuum pump (12), to maintain a pressure in the reactor below atmospheric pressure. The plant comprises a gas collector connected to the fecal reactor for collection of the vented gases, chemical silos (9) associated dosing pumps (10), and a device for drying the fertilizer product.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Methods: The quantity and type of oxidizing acid added to the fecals are able dissolve greater than or equal to 50 wt.% of the fecals. The volume and type of oxidizing acid added to the fecals are able to dissolve greater than or equal to 70 wt.% of the fecals. Any solid and acid-insoluble components that are separated are treated with a strong base to dissolve these components partially. The component dissolved with the base is used for the partial neutralization. Content of nitrogen, phosphorus, and potassium is measured after neutralization. Components containing phosphorus, potassium, or nitrogen are added so that a predetermined ratio between nitrogen, phosphorus, and potassium (NPK) is obtained. Content of calcium, sulfur, magnesium, manganese, copper, boron, chlorine, and iron is measured, and a source of these substances is added if necessary to obtain a predetermined ratio between the substances. Neutralization is carried out with a quantity and type of base so that the final pH of the fertilizer is at 4-10, preferably 6-8. The fecals used are produced by pigs, and pig fecals are obtained by separating a liquid fraction (liquid manure) from slurry. The fertilizer product production further comprises drying the fertilizer product to obtain a concentrate or a solid product. Drying is carried out partially by evaporation or by spray drying. Preferred Compounds: The oxidizing acid is nitric acid, fuming nitric acid, peroxynitric acid, peroxophosphoric acid, hypophosphoric acid, pyrophosphoric acid, peroxodiphosphoric acid, peroxosulfuric acid, thiosulfuric acid, pyrosulfuric acid, peroxydisulfuric acid, hypochlorous acid, chlorous acid, chloric acid, perchloric acid, bromic acid, iodic acid, periodic acid, peroxalic acid, performic acid, peracetic acid, and/or perbenzoic acid, preferably concentrated nitric acid ( greater than or equal to 10 wt.%). It is used in mixture with a further acid including hydrochloric acid, sulfuric acid, formic acid, chloroformic acid, monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, oxalic acid, and maleinic acid. The strong base is alkali metal hydroxide, alkaline earth metal hydroxide, or aqueous solution of alkali metal phosphate, preferably sodium hydroxide or potassium hydroxide. Neutralization is carried out with a base including ammonia water, alkali metal hydroxide, alkaline earth metal hydroxide, aqueous solution of alkali metal phosphate, or aqueous solution of ammonium (hydrogen) phosphate. ACTIVITY - Fertilizer. No biological data given.    MECHANISM OF ACTION - None given.