Method for producing organic granulated fertilizer or feed by biogas slurry

Abstract

The invention relates to a method for producing an organic granulated fertilizer or feed by biogas slurry, which comprises the following steps of: (1) preparing mixed slurry, i.e. mixing the filtered biogas slurry and sodium humate to obtain the slurry; (2) preparing an intermediate, i.e. heating and stirring the slurry, concentrating and drying to obtain the intermediate; (3) preparing the organic granulated fertilizer, i.e. adding dregs of Chinese herbal medicine, the sodium humate, industrial solid waste and inorganic nitrogen phosphorus and potassium fertilizer into the intermediate and pelletizing after mixing so as to obtain the granulated fertilizer; and (4) preparing the organic feed, i.e. adding corn starch, bran powder, pine needle meal, the sodium humate and clear liquid of the biogas slurry into the intermediate and squeezing and pelletizing after mixing so as to obtain the organic feed. In the method disclosed by the invention, the biogas slurry in a biogas fermenting tank is sufficiently utilized, the biogas slurry not only can be used for being applied in rural areas as the organic fertilizer, but also can be prepared into the feed for being used in the breeding industry. The method has the advantages that the biogas slurry is comprehensively utilized; the nature is greened; the environment is purified; and the method is beneficial to virtuous circle of the ecological organic agriculture. The method has simple equipment and is time-saving and labor-saving. The process method is simple, convenient and feasible and is beneficial for being popularized and applied in the rural areas.

Description

technical field [0001] The invention relates to fertilizers, in particular to organic fertilizers, in particular to methods for preparing organic fertilizers and feed through fermentation. Background technique [0002] Biogas slurry is one of the residues after anaerobic fermentation of organic matter such as human and livestock manure and crop straws to produce biogas. Biogas slurry is rich in nitrogen, phosphorus, potassium, various amino acids, vitamins, proteins, gibberellins, auxins , sugars, nucleic acids, and antibiotics, as well as active resistant substances such as butyric acid, indole acetic acid, and vitamin B12, so it has a dual role of promoting the growth of crops and livestock and controlling the occurrence of diseases. [0003] At present, the utilization of biogas slurry is limited to being directly irrigated in the farmland as a liquid fertilizer, or used for foliar spraying after filtration. Obviously, this method of utilization has great limitations due...

AI Technical Summary

Problems solved by technology

No. 200910019403.X "A Process for Recovering Nitrogen-Phosphorus Compound Nutrients from Biogas Slurry and Purifying Primary Biogas" although it proposed that "after mixing the former system fermentation biogas slurry with flocculant, precipitation and separation to obtain phosphorus-containing solid fertilizer" Technical solution, but the process is very complicated and difficult to apply