Cow dung may seem like a waste from livestock farming, but it is actually a valuable raw material for making high-quality organic fertilizer. Scientifically converting it into fertilizer can not only solve the problem of livestock pollution, but also provide natural nutrients for agricultural production. The whole process is efficient and environmentally friendly.
The first step of the conversion is pretreatment. Fresh cow dung has a high water content and needs to be treated with a dewatering machine, which can remove 30% of the water content in the cow dung. This is convenient for subsequent operations, and the separated liquid can also be used to produce biogas to maximize resource utilization, while the solid part is used as the basic raw material for converting fertilizer.
Then enter the key fermentation stage. Mix the pretreated cow dung with straw powder in a suitable proportion and pile it into a pile of 1.2-1.5 meters high. With the help of a fermentation compost turner, the pile is regularly turned over to allow full contact with oxygen, and the temperature is stabilized at 55-65℃ with thermometer monitoring. This temperature range can effectively kill the bacteria, eggs and weed seeds in cow dung. After 20-30 days, the cow dung can be decomposed and become a nutrient-rich semi-finished product.
After fermentation, the decomposed cow dung needs to be broken into fine powder by a crusher to remove the lumps and impurities in it, so as to prepare for subsequent processing. The crushed material enters the new type organic fertilizer granulator, and the material is pressed into granules by high-speed rotating mechanical stirring and the friction generated. The granules have a high forming rate and moderate hardness, which can better retain the nutrients in the cow dung.
After the granules are formed, they are first passed through a drum fertilizer dryer to remove excess water, and then cooled and shaped by a drum fertilizer cooler to avoid mildew during storage. Finally, the screening machine selects qualified granules, and the unqualified ones are returned for reprocessing. The qualified ones are coated by a coating machine, and then packaged according to specifications by a packaging machine.
Through such a set of processes, cow dung is transformed into high-quality organic fertilizer, which helps the development of ecological agriculture and is an efficient way to turn waste into treasure.