Research on Processing Technology and Equipment of Organic Fertilizer from Livestock and Poultry Manure

Organic fertilizer is mainly used to provide the nutrients needed for the growth of plants. The livestock and poultry manure has been processed to eliminate the toxic and harmful substances in the manure and retain a large number of beneficial substances, including a variety of organic matter and trace elements such as nitrogen, phosphorus, and potassium. Animal manure organic fertilizer not only has a long fertilizer effect, but also provides comprehensive nutrition for crops. It can also improve soil quality, effectively improve soil physical and chemical properties and biological activity, and prevent soil compaction and acidification.

With the increase of large-scale livestock and poultry farms, the total amount of manure put into farmland has exceeded the capacity of farmland, and the random accumulation of manure that cannot find a way out has caused serious environmental pollution, which has attracted the attention of the government. Many countries have formulated corresponding management regulations to regulate the treatment of livestock and poultry manure in a legislative way. The regulations stipulate that large-scale livestock and poultry farms must have facilities for the storage, treatment and utilization of manure and sewage. Manure must not be piled near the water source, and sewage cannot be discharged at will without treatment. At the same time, developed countries subsidize livestock and poultry manure processing plants to promote the resource utilization of livestock and poultry manure in a policy-guided manner.

Livestock and poultry manure contains crude protein, crude fiber, minerals, trace elements and multiple vitamins and other nutrients, especially the crude protein content is very high, the manure can be processed into a good livestock and poultry feed. There are mainly drying methods, silage methods and biological methods to turn livestock and poultry manure into feed. The main drying methods are: natural drying, high temperature drying and low temperature drying. Natural drying costs are low, but the drying time is too long, and it is easily affected by environmental factors such as weather; high-temperature drying uses high-temperature rapid dryers for heating, which has fast drying speed and good sterilization effect, but it consumes more energy; The excrement is transported to the low-temperature dryer, and the low-temperature dried excrement is suitable for storage.

The processing process of organic fertilizer from livestock and poultry manure: raw material treatment → harmless treatment → mixed ingredients → granulation → cooling and screening → metering and sealing → finished product storage.

Among them: raw material treatment, that is, separate water and fertilizer for individual manure with excessive moisture content; harmless treatment, that is, adding fermentation bacteria to the manure, through high-temperature fermentation, to kill harmful bacteria and insect eggs in the manure, Thoroughly decomposed fertilizer; mixed ingredients, that is, according to the local soil structure, add related materials to improve the fertility of animal manure, such as humic acid, nitrogen, phosphorus, and potash fertilizer, to improve the fertility and adaptability of organic fertilizer; granulation, that is, use according to organic fertilizer It is required to crush, mix and granulate organic fertilizer. After the pre-treated livestock and poultry manure is fermented in the agitated fermentation device, an appropriate amount of nitrogen, phosphorus, potassium and other elements are added in a certain proportion to make the trace elements contained in the organic fertilizer production standard. Processing techniques such as granulation, drying, and packaging can process livestock and poultry manure into organic fertilizer with high fertilizer efficiency, convenient transportation, safe use and affordable prices.