Preparation of small molecular organic liquid fertilizer containing nitrogen, phosphorus and potassium by an acid hydrolysis method

Abstract

The invention discloses an acid hydrolysis method for preparing nitrogen, phosphorus and potassium-containing small-molecule organic matter liquid fertilizer. The liquid fertilizer is prepared from, by mass, 50%-80% of organic wastewater, 5%-10% of a composite acid solution, 10%-20% of nitrogen and phosphorus raw materials and 5%-20% of potassium raw materials. The liquid fertilizer is prepared through the steps that the organic wastewater is taken as the raw materials, a hydrolysis reaction is firstly performed through composite acid, the nitrogen and phosphorus raw materials and the potassium raw materials are added for a reaction, centrifugal separation is performed, supernatant is taken, and then the water-soluble small-molecule organic matter liquid fertilizer is obtained. According to the acid hydrolysis method, the organic wastewater is taken as the raw materials, and through acid hydrolysis of the composite acid, oxidation of basic oxides, pH value regulation and addition of the nitrogen and phosphorus raw materials, the obtained liquid fertilizer is rich in nitrogen, phosphorus, potassium and a large amount of small-molecule organic matter and can be efficiently absorbed and utilized by plants.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to an acid hydrolysis method for preparing small molecular organic liquid fertilizers containing nitrogen, phosphorus and potassium. Background technique [0002] In the diverse fertilizer market, fertilizers can be divided into solid fertilizers, liquid fertilizers, and gas fertilizers according to their forms. In general, fertilizers that flow continuously are called liquid fertilizers. Compared with solid fertilizers, liquid fertilizers have the advantages of low production cost, less pollution in the production process, and more convenient addition of organic materials, such as amino acids, fulvic acid, etc. Therefore, the formula of liquid fertilizers is easy to adjust and convenient for precise fertilization. [0003] Generally, liquid fertilizers on the market are mostly liquid fertilizers based on unit nutrients such as liquid ammonia, ammonia water, urea ammonium nitra...

AI Technical Summary

Problems solved by technology

Although this method can crack large organic compounds into small molecular organic compounds, the process uses a single acid for acid hydrolysis, and the acid hydrolysis and oxidation are carried out in the same period of time, and the properties of the obtained organic substances are not stable. Condensation reaction will occur. Although the utilization rate of macromolecular organic wastewater is higher than that of the original macromolecular organic wastewater, it is not the most easily absorbed and utilized substance by plants.

[0004] In addition, the simple use of organic waste water to produce small molecular organic compounds as fertilizers can meet the carbon demand of plants, but it ignores the supply of nitrogen, phosphorus and potassium, and it is difficult to fully meet the nutritional needs of plants.

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