Breeding manure biological drying system and method in farm

Abstract

The invention discloses a bio-drying system and method for excrement in a livestock farm. The bio-drying system for the excrement in the livestock farm comprises a stirring system, a conveying system, an automatic batching system, an aerating system, at least one bio-drying workshop, a ventilation system and a deodorization system. In the bio-drying system, the collected excrement in the livestock farm is mixed with auxiliary materials through the stirring system, the mixed materials are then transferred to the automatic batching system on the top of the bio-drying workshop through the conveying system, the automatic batching system automatically distributes the materials to the bio-drying workshop, heat produced when the excrement and the auxiliary materials are mixed is delivered from bottom to top under the action of the aerating system and the ventilation system in the bio-drying workshop, and therefore the whole material is evenly heated, the temperature rises, and the excrement is rapidly dried in a bio-drying mode; meanwhile, moisture in the materials becomes water vapor, the water vapor is exhausted to the deodorization system under the action of the ventilation system to be purified and then exhausted to the air, and no secondary pollution is caused.

Description

technical field [0001] The invention relates to a system and a method for biological drying of breeding feces in a farm. Background technique [0002] The effective treatment of pig manure in pig farms has become a bottleneck that plagues the development of the pig industry, and has become a major source of non-point source pollution in my country. In terms of its emissions, the amount of organic matter that is equivalent to COD is the largest in industries and cities. Domestic waste is 10 times that of domestic waste. Now solid waste in our country has been effectively treated, regardless of domestic waste or hazardous waste. However, the treatment of manure in pig farms in my country is still simple or immature. [0003] At present, the feces treatment methods in pig farms mainly include: incineration, drying, deodorization, and recycling (composting and fermentation). [0004] Incineration method, because livestock and poultry manure contains organic substances, similar w...

AI Technical Summary

Problems solved by technology

Natural drying. At present, natural air-drying or sun-drying is adopted in China. This method has low efficiency, large floor space, high labor costs, and secondary pollution to the air. It is not suitable for large-scale breeding and breeding plants; In China, internal electric heating or coal heating is mostly used for drying. This method consumes a lot of energy, has the disadvantages of large investment and high processing cost, and is not suitable for the promotion of aquaculture plants. Mechanical drying methods generally use screw extrusion drying or plate-and-frame filter drying in China. , this method needs to consume a large amount of electric energy, and needs to be equipped with a high-power transformer. It has the disadvantages of high investment cost, high processing cost, high maintenance cost, and a high moisture content of about 40%. It is not suitable for large-scale breeding plants.

[0006] Deodorization method. It has been identified that the odorous gases produced by livestock and poultry manure are mainly sulfur-containing compounds, nitrogen-containing compounds, volatile fatty acids and ketones; it is generally believed that ammonia, carbon dioxide, methane and hydrogen sulfide are the main causes of air pollution. The main cause of the smell is to add formalin, ethylene, sodium bicarbonate, methyl bromide and other agents to the livestock and poultry manure to kill the bacteria and reduce the volatilization of ammonia gas. The processed products are used to feed ruminant livestock. However, the one-time investment of chemical treatment technology is large, the product cost is high, and secondary pollution occurs, so it is difficult to obtain good economic benefits and cannot be accepted by the market smoothly.

[0007] Recycling method. At present, the common resource treatment process of pig farm manure is composting process. The composting process includes anaerobic composting and aerobic composting; Auxiliary materials are used to adjust the moisture content of feces, and the compost fermentation time is more than 20 days, and the production cost is high. In addition, in order to make the fertilizer produced by feces composting have production benefits, it needs to reach a certain scale, and the compost production must be scaled up. It is necessary to transport the feces of small and medium-sized pig farms to the same composting plant. Fresh pig manure with a high moisture content will cause secondary pollution during transportation.

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