Method for preparing organic fertilizer by virtue of rapeseed oil residues

Abstract

The invention discloses a method for preparing an organic fertilizer by virtue of rapeseed oil residues. The method comprises the following steps: (1) preparing an enzymatic hydrolysis product of the oil residues; (2) uniformly mixing the following components in parts by mass: 75 to 90 parts of enzymatic hydrolysis liquid obtained in step (1), 15 to 25 parts of monopotassium phosphate, 6 to 12 parts of a trace element solution and 0.4 to 0.6 part of a preservative; (3) piling, fermenting and drying 35 to 55 parts by mass of enzymatic hydrolysis solids obtained in step (1), 15 to 35 parts by mass of animal waste and 35 to 55 parts by mass of crop straws to obtain a powdery organic fertilizer, or further performing granulation to obtain a granular organic fertilizer according to a conventional technology. According to the method for preparing the organic fertilizer by virtue of the rapeseed oil residues, high-quality proteins in the oil residues can be fully utilized, and the efficiency of various nutrients in the oil residues can be improved.

Description

technical field [0001] The invention relates to a fertilizer preparation method, in particular to a method for preparing organic fertilizer by using rapeseed oil residue. Background technique [0002] Oil residue is the residue from the cold filtration process during the pressing process to produce vegetable oil, also known as filter cake. Compared with most of the organic matter in the existing fertilizer production, the oil residue contains more protein. According to the existing common fermentation method, the protein is completely decomposed and the inorganic nitrogen is released for crop absorption and utilization. A waste of medium and high quality nitrogen sources. At present, oil residue is generally directly used as a raw material of organic fertilizers, mixed with other organic matter and fermented to produce organic fertilizers or organic-inorganic compound fertilizers, such as CN103497035A, CN 102942423A, CN102992867A, CN102826930A, CN102731207A, etc. are all su...

AI Technical Summary

Problems solved by technology

However, the above-mentioned biodegradation method and acid hydrolysis method also have some deficiencies. One is that the treatment of oil residues only works on the protein parts that are easy to decompose in the oil residues, while the parts that are difficult to decompose and phosphorus-containing compounds have poor decomposing properties, and the crops are not easy to absorb and utilize. , is also a waste of nutrient resources; secondly, the two methods directly mix degradation products or hydrolyzates with other raw materials and apply them to the soil as solid organic fertilizers. Due to the large soil volume, amino acids and various bioactive components are dispersed , the contact with the crop root system is reduced, or due to soil adsorption and soil water loss, etc., the active ingredients cannot be well utilized; moreover, the CN101863686A biological method for treating oil residue uses four kinds of microbial bacteria as decomposing organisms, requiring aseptic conditions. The process is complicated, and the components of the product obtained by the CN101863691A acid hydrolysis method for treating oil residue are relatively single, which cannot meet the various nutritional requirements of crops