Method and system for converting livestock and poultry manure and waste straw materials into organic fertilizer

Abstract

The invention relates to a method and system for converting livestock and poultry manure and waste straw materials into organic fertilizer. According to the invention, an unintermittent aeration process and a leavening agent are employed in the process of fermentation conversion, so fermentation materials does not produce new gas and liquid with offensive odor during high-efficiency rapid fermentation and decomposition, which enables secondary pollution to be avoided; moreover, time for fermentation and decomposition of organic waste like the livestock and poultry manure can be substantially shortened to 9 h or less from traditional 30 to 40 d, so environment-friendly treatment capability of waste produced by livestock and poultry and the recycling efficiency of the waste are substantially improved. The system for converting the livestock and poultry manure and waste straw materials into the organic fertilizer is provided with a variety of sensors; through a combination of the sensors and a control unit, automatic monitoring and real-time fault diagnosis can be realized; the current fermentation situation and maturation phase of the organic fertilizer can be learned about through parameter analysis; and the system can realize early warning and remote automatic control.

Description

Technical field [0001] The invention relates to the field of recycling and utilization of agricultural and animal husbandry waste, in particular to a method and system for converting livestock and poultry manure and straw waste into organic fertilizer. Background technique [0002] With the development of technology, the scale of animal husbandry and planting industry is increasing. As the scale expands, more organic wastes are produced, and improper disposal will seriously pollute our ecological environment; for example, livestock manure from farms, straw and straw from planting industries, etc., discharge a large amount every year Increase has become an important part of environmental pollution that cannot be ignored. [0003] Generally, intensive farms and plantations deal with organic waste in the following three ways: [0004] 1. Aerobic composting degradation treatment, that is, accumulation of organic fertilizer waste after production and processing or livestock and poultry ...

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Problems solved by technology

[0004] 1. Aerobic composting degradation treatment, that is, to pile up the organic fertilizer waste after production and processing or excreted by livestock and poultry in large storage silos or compost tanks, sometimes adding microbial agents and turning the compost regularly, usually it takes After 45 days, it reaches maturity and becomes an organic fertilizer; this treatment method takes up a lot of space, takes a long time to produce, and is prone to foul odor and breeding of mosquitoes, which is easy to cause secondary pollution to the surrounding environment

[0005] 2. Anaerobic fermentation treatment in closed tanks, organic waste is anaerobically digested to produce biogas to achieve the purpose of waste reuse; since biogas fermentation requires relatively stable conditions such as anaerobic, certain organic matter content, temperature and pH, The fermentation time is also longer, usually 25-40 days; therefore, the capacity of the fermentation device is required to be relatively large, and the site occupation and one-time investment are relatively large

At the same time, since biogas fermentation will produce a large amount of biogas slurry and biogas residue sewage, due to the relatively low nutrient content, it is not suitable for long-term irrigation of farmland. If it is directly discharged, it will seriously pollute rivers and surface water bodies, and will cause secondary pollution.

[0006] 3. Organic waste is directly dried by high-temperature drying equipment to become organic fertilizer. The total nutrient of nitrogen, phosphorus and potassium of the organic fertilizer obtained by drying in this way is still low, and the organic matter is not decomposed. Plant roots will burn when used for a long time. affect crop production

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