Method for preparing organic fertilizer based on animal and plant wastes

Abstract

The invention discloses a method for preparing an organic fertilizer based on animal and plant wastes. The method comprises the following steps: S1, preparing an organic fertilizer raw material from one or two animal wastes selected from chicken manure and pigeon manure and any one or two or three selected from straws, mushroom residues and rape seed cakes according to a certain weight ratio, adding the prepared organic fertilizer raw material into cracking equipment; S2, carrying out vacuumizing treatment on the cracking equipment; S3, heating the cracking equipment having undergone vacuumizing treatment to 220 DEG C-270 DEG C through water vapor, pressurizing the cracking equipment to 15-21 MPa, and hydrolyzing the organic fertilizer raw material through subcritical water to obtain a powdery product; and S4, pressing the powdery product into a particle shape through a pelletizer. According to the invention, calcium silicate is synthesized through a reaction of silicon dioxide and calcium carbonate naturally existing in the chicken manure and the pigeon manure under hydrothermal conditions, heavy metal in the organic fertilizer raw material can be adsorbed in the calcium silicatecrystal forming process, the heavy metal can be sealed in crystals, and plants are prevented from absorbing the heavy metal in the organic fertilizer.

Description

technical field [0001] The invention relates to the field of organic fertilizer production or the field of subcritical water, in particular to a method for preparing organic fertilizer based on animal and plant waste. Background technique [0002] my country is a country with a large population, and grain production occupies an important position in the development of agricultural production. Usually the way to increase food production is to expand the area of ​​cultivated land or increase the yield per unit area. According to the national conditions of our country, the potential to continue to expand the cultivated land area is not great. Although there are still many uncultivated lands in our country, most of them have the problems of high investment and great difficulty. This determines that my country's grain production must take the way of increasing the yield per unit area. Fertilization can not only improve soil fertility, but also an important measure to increase c...

AI Technical Summary

Problems solved by technology

However, the preparation of the current organic fertilizer is more troublesome, and the preparation time is longer, and it cannot be completed in a short time. On the one hand, traditionally prepared organic fertilizers contain a large amount of harmful substances such as fecal Escherichia coli and roundworm eggs, and the heavy metals in the organic fertilizer raw materials cannot be separated from the fertilizer. After the crops absorb the heavy metals in the organic fertilizer, it will cause certain safety hazards to people.