Re-treated cow dung recycling system

Abstract

The invention belongs to the field of livestock and poultry manure treatment and utilization, and particularly relates to a re-treated cow dung recycling system which sequentially comprises a cow house, a dung collection tank, a homogenate tank, an anaerobic fermentation tank, a dry-wet separator and a cow dung drying chamber according to cow dung treatment flow. The cow dung drying chamber is connected with a heating source biogas combustion chamber, the heating source biogas combustion chamber is connected to the anaerobic fermentation tank through a biogas transmission pipeline, a desulfurization tower is arranged between the biogas combustion chamber and the anaerobic fermentation tank, and liquid separated by the dry-wet separator flows to a biogas slurry tank. Recovery of biogas fermented by dung is separated from utilization of biogas liquor, biogas utilization is increased, pollution of the biogas liquor for irrigation is reduced, utilization of the biogas liquor is facilitated, generates a large number of biogas, solid residual slag in the cow dung recycling process is heated and dried by a large number of biogas generated by anaerobic fermentation of cow dung to prepare cow bed padding, and cyclic utilization is achieved.

Description

technical field [0001] The invention belongs to the field of treatment and utilization of livestock and poultry manure, and in particular relates to a recycling system for cow manure after reprocessing, more specifically, relates to a solid material obtained after processing and reprocessing cow manure as a raw material for use as a bedding material for cattle beds, A system in which liquids are used for crop irrigation. Background technique [0002] As a kind of animal organic fertilizer, cow dung is a precious resource. Cattle eat a lot of food and excrete more feces and urine than other livestock every day. An adult cow excretes 28.4-48.1kg per day and night. The daily urine output ranges from 6.5 to 14.1kg. A large amount of cow dung not only pollutes the air and water sources, but also occupies a large area of ​​land. At present, the treatment methods of cow dung at home and abroad are mainly used for composting and biogas preparation. [0003] Using composting treatme...

AI Technical Summary

Problems solved by technology

[0006] The liquid separated by the above technical scheme achieves zero discharge and will not pollute the environment, but it has at least three defects: 1. The utilization rate of feces is not high, no effective anaerobic fermentation process is carried out and only for biogas Therefore, the generated biogas is very limited, especially the utilization of the generated biogas is lacking, and a recycling system cannot be formed, that is, the biogas generated by the feces itself is used for the heating and drying of solid feces ; 2. When biogas is produced from anaerobic fermentation equipment, especially when it is fermented at medium temperature or high temperature, it carries a large amount of H 2 S, because there is still a large amount of water vapor in the biogas, the water and the H in the biogas 2 S acts together to accelerate corrosion and clogging of metal pipes, valves and flow meters

In addition, H 2 S burns to produce SO 2 , combined with water vapor in the combustion products to form sulfurous acid, which will cause corrosion on the metal surface of the equipment, and will also cause pollution to the atmospheric environment and affect human health

Therefore, before using the biogas, the H must be removed 2 S; 3. The biogas slurry fermentation and biogas slurry utilization in the biogas digester are integrated. When biogas slurry irrigation is needed, the biogas slurry carries a considerable part of the biogas, because the biogas has not been treated in an environmentally friendly manner, which will produce a serious pungent smell and harm the environment. The environment is polluted

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