Method for removing grit from chicken dung

Abstract

The invention belongs to the field of biogas projects and in particular relates to a method for removing grit from chicken dung. The method is characterized by comprising the following steps: pouring chicken dung into a stirred grit chamber, adding water for stirring, diluting and removing grit, removing grit with the particle size of larger than 0.6mm in the dung, overflowing the upper chicken dung diluent subjected to stirring and grit removing into a hydrolysis acidification pool, and separating to remove grit with the particle size of smaller than 0.6mm in the hydrolysis acidification process, wherein the hydrolysis acidification pool comprises a primary hydrolysis acidification pool and a secondary hydrolysis acidification pool from a higher part to a lower part. The method disclosed by the invention has the advantages that the grit of various particle sizes in the dung can be completely removed due to the grit removal method, so that the grit content of feed liquid entering a fermentation tank is reduced to 2 percent or below, the influence of the grit on various subsequent links is greatly reduced, and stable operation of the biogas project by taking the chicken dung as a raw material is realized. Meanwhile, due to two-stage hydrolysis, insoluble macromolecular substances in the feed liquid are degraded into soluble small molecular substances, which are conveniently utilized by the methane bacteria, so that the gas production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of biogas engineering, and in particular relates to a method for removing sand from chicken manure. Background technique [0002] For example, chicken manure contains sand of various particle sizes, and a certain amount of large particle sand is often fed in chicken feeding to facilitate the digestion of chickens. At the same time, the feed also contains impurities such as stone powder and calcium hydrogen phosphate. These small-sized impurities cannot be completely digested by the chicken, and will be excreted with the feces, and will be combined with the mucus in the digestive tract during the digestion process, increasing the removal efficiency. difficulty. [0003] In the biogas project using chicken manure as raw material, the sand must be removed before the chicken manure enters the anaerobic tank for fermentation. If it cannot be removed effectively, the sand will cause serious wear and tear on subsequent equi...

AI Technical Summary

Problems solved by technology

At the same time, the feed also contains impurities such as stone powder and calcium hydrogen phosphate. These small-sized impurities cannot be completely digested by the chicken, and will be excreted with the feces, and will be combined with the mucus in the digestive tract during the digestion process, increasing the removal efficiency. difficulty

[0003] In the biogas project using chicken manure as raw material, the sand must be removed before the chicken manure enters the anaerobic tank for fermentation. If it cannot be removed effectively, the sand will cause serious wear and tear on subsequent equipment such as feed pumps and shredders. Second, it will cause blockage of feed pipes and other pipelines, and third, it will cause severe sand settling in hydrolysis tanks, fermentation tanks, etc., increasing the workload of cleaning, and in severe cases, it will affect normal fermentation and gas production

At present, there is not much research on chicken manure sand removal, and there is no effective molding method