Chitosan-sodium alginate-crosslinking-coated biogas residue composite particles and preparation method thereof

Abstract

The invention relates to chitosan-sodium alginate-crosslinking-coated biogas residue composite particles. The preparation method is characterized by comprising the following steps: firstly, performing solid-liquid separation on biogas residues in a biogas tank, and performing solidification; performing uniform mixing with attapulgite and other nutrients, adding water, performing kneading, and performing granulation to obtain biogas residue composite particles; secondly, preparing a neutral sodium hydroxide-hydroxylamine hydrochloride-isopropanol mixed solution, performing a reaction on active hydroxyls in sodium alginate with ethyl chloroacetate to modify the sodium alginate; and finally, crosslinking the modified sodium alginate and chitosan to obtain a coating agent, uniformly spraying the coating agent on the surfaces of the biogas residue composite particles, and performing drying to obtain the chitosan-sodium alginate-crosslinking-coated biogas residue composite particles. The biogas residue composite particles are capable of effectively increasing the organic matter and nutrient contents in soil, loosening the hardened soil, accelerating the mellowing progress of raw soil and restoring the productivity of the raw soil, and have other favorable characteristics.

Description

technical field [0001] The invention belongs to the field of agriculture, and in particular relates to biogas residue composite particles coated with chitosan-sodium alginate cross-linking and a preparation method thereof. Background technique [0002] Biogas residues are rich in organic matter, humus, micronutrients, various amino acids, enzymes and beneficial microorganisms. The texture is loose, the performance of moisture retention is good, and the pH is moderate. After being decomposed by a decomposing agent and produced as a fertilizer, it can play a very good role in improving the soil. Biogas residues contain nitrogen, phosphorus, potassium and other elements, which can meet the needs of crop growth. [0003] In northern my country and some alpine regions, the winter is long and cold. In order to allow people to eat fresh vegetables in the cold winter, greenhouses such as plastic greenhouses have been greatly developed. Crops need fertilizer and water to grow. In ...

AI Technical Summary

Problems solved by technology

In greenhouses, due to the shelter of plastic sheds, shed frames and walls, especially in winter, the eyesight is weak, so in plastic greenhouses a