1. Livestock manure. The Bulletin of the First National Survey of Pollution Sources in 2010 showed that fecal pollution caused by livestock manure discharged from poultry and livestock breeding has become one of the most important sources of agricultural pollution in my country. It is predicted that in 2020, my country's livestock manure discharge will reach 4.229 billion tons. The larger the scale of farming, the more feces produced, and the environmental pollution problems will become more serious.
Judging from the advanced level of the current treatment methods of organic waste from livestock and poultry farming, there are mainly two levels: the first level is the backward treatment method, mainly the application of original composting, which is characterized by large pollution and long treatment cycle. Moreover, it is difficult for the treated manure to meet the standards required by my country's agricultural industry (NY/T 1168-2006), and finally it will be consumed or used by the cultivated land in nearby rural areas, with no direct or meager benefits; the second level is a more advanced treatment method , mainly for the use of facilities and equipment during the treatment process. This method is characterized by a short treatment cycle, less pollution, can meet industry standards (NY/T1168-2006), and will produce valuable products, such as organic fertilizers, biogas And feed (chicken manure), biomass coal (cow manure), etc. The characteristics of this method are superior to those of the previous one, and the value generated is more than that of the previous one, but the input cost is higher.
2. Utilization of straw. Straw returning to the field after comprehensive utilization is the most beneficial method in the application of straw returning to the field. It uses straw as a starting point to realize multiple recycling and multi-layer utilization of organic matter, which solves the contradiction of energy shortage in rural areas and improves the overall benefits of the agricultural ecosystem. Comprehensive utilization can not only recover energy, but also make 50% of organic matter and most of the nutrients Return the field to maintain soil fertility.
