Bovine feces three-stage treatment process

Abstract

The invention relates to three-section treatment technology for cow manure, which comprises: adding straw powder which accounts for 0.5 to 2 times of the total volume of the cow manure into the cow manure, performing aerobic fermentation and temperature rise treatment on mixed raw materials of the cow manure and straws, and sending the mixed raw materials into an anaerobic reactor through a loading machine; uniformly spraying biogas slurry to the fermented raw materials in the anaerobic reactor for a few times, adjusting the water content of the fermented raw materials to be between 75 and 80 percent, and performing anaerobic fermentation treatment for a period; making biogas slurry generated by anaerobic fermentation flow to a liquid storage tank, using the biogas slurry for recycled spraying, and making biogas generated by the reactor pass through a biogas cooling and purification system and enter a gas storage device; performing aerobic fermentation treatment on fermented residue after anaerobic fermentation is over, stopping aerobic fermentation when the water content of the fermented residue is reduced to be between 30 and 40 percent, and drying the fermented residue to make the water content of the fermented residue reduced to be between 25 and 10 percent; and sending the fermented residue into a crusher, crushing the fermented residue into particles to prepare an organic fertilizer, and packaging the organic fertilizer for standby. The technology has reasonable design and low cost.

Description

technical field [0001] The invention relates to a process for treating cow manure, in particular to a three-stage fermentation process for manure. Background technique [0002] At present, with the rapid development of my country's livestock and poultry breeding industry, livestock and poultry produce a large amount of feces and sewage, causing serious environmental pollution. At present, the treatment of livestock and poultry manure partly adopts natural composting aerobic fermentation process, which is used as organic fertilizer in farmland after fermentation, and partly adopts anaerobic fermentation process to convert livestock and poultry manure into biogas, and the fermentation residue biogas slurry is used as Organic fertilizers are reused on farmland. Among them, the anaerobic fermentation process is used to treat livestock and poultry manure, which is to dilute the livestock and poultry manure with water to reduce the dry matter concentration of the manure to 10% or...

AI Technical Summary

Problems solved by technology

Among them, the anaerobic fermentation process is used to treat livestock and poultry manure, which is to dilute the livestock and poultry manure with water to reduce the dry matter concentration of the manure to 10% or less, so that the water consumption is large and the biogas slurry produced is large. However, land consumption It is difficult to absorb and easily cause secondary pollution

Due to the low dry matter concentration, under the same fermentation temperature requirements, the lower the dry matter concentration, the more energy consumed and the higher the operating cost