The most commonly used treatment of livestock and poultry manure is high-temperature aerobic composting technology, which is a process of using microorganisms to decompose biodegradable organic solid waste into relatively stable humus substances under certain temperature, humidity and pH conditions. High-temperature aerobic composting is an effective way to realize the harmlessness and utilization of organic waste. Its technological process is mainly composed of pretreatment, aerobic fermentation, post-treatment and storage. Its key technologies are mainly pretreatment and aerobic fermentation.
Compost pretreatment is mainly to adjust the moisture, pH and carbon-nitrogen ratio of compost raw materials, and to add microbial fermentation agents to compost raw materials. The initial moisture content of composting feces should generally be 40% to 60%. Too low moisture is not conducive to the growth of microorganisms, and too high moisture will block the gaps in the compost, affect ventilation, lead to anaerobic fermentation, slow down the degradation rate, and prolong Heap time. pH is a parameter to evaluate the living environment of microorganisms, and the most suitable pH in the composting process should be 5.5-8.0. In the composting process, the pH value is generally considered to be a non-important factor, because most bacteria can grow and multiply in the pH range of 5.5-8.0. The carbon and nitrogen balance of compost raw materials is a key factor for the optimal biological activity of microorganisms. The carbon-nitrogen ratio of compost raw materials is generally more suitable between 25:1 and 35:1. The carbon-nitrogen ratio is small, the temperature rises quickly, but the maximum temperature reached by the stack is low; the carbon-nitrogen ratio is large, the maximum temperature reached by the stack is high, but the temperature rises slowly. In actual production, materials such as straw, rice husk or sawdust can be used to adjust the carbon-nitrogen ratio. Composting is a biochemical degradation process in which microorganisms act on organic matter. Microorganisms are the main body of the composting process and the most critical and active components in the composting process. Adding microbial fermentation agents to compost raw materials can accelerate the decomposition and maturity of organic matter in compost raw materials and promote the release of available nitrogen in organic materials. Click here to learn more about organic waste composting
2. Aerobic fermentation
The aerobic fermentation composting process consists of two stages: primary fermentation and secondary fermentation. The time required for composting operation varies with the carbon-to-nitrogen ratio, humidity, weather conditions, and the type of composting operation and management. Under normal circumstances, the fermentation period is about 9 to 35 days. Primary fermentation refers to the stage from the temperature rising to the beginning of falling, which is the first stage of compost fermentation. Oxygen supply to the compost bed or fermentation unit is usually required at this stage. Oxygen is a necessary condition for the survival of aerobic microorganisms. Sufficient oxygen supply is an important condition to ensure the reproduction and development of aerobic microbial populations, and has an important impact on the composting time and the quality of the final product. SX can provide you with professional equipment for organic waste composting. It is generally believed that the volume content of air oxygen in the compost should be kept at 5% to 15%, and if it is lower than 5%, it will lead to anaerobic fermentation; if it is higher than 15%, the compost body will be cooled, resulting in the survival of a large number of pathogens. At present, the ventilation methods used by organic fertilizer equipment mainly include using power shovel or other special equipment to turn the pile, inserting a ventilating pipe with holes into the dung pile, using high-pressure fans to force ventilation and natural ventilation to supply oxygen, etc. During the primary fermentation process, the temperature of each test point in the stack should be kept at 55-65°C, not higher than 75°C, and the duration should not be less than 5 days. Secondary fermentation refers to the fermentation process in which microorganisms decompose refractory organic matter and fermentation intermediate products at a relatively low speed after the compost undergoes primary fermentation. Ventilation is usually not required at this stage, but regular compost turning should be performed. If you need more detail, you can visit https://fertilizerequipmentmanufacturer.com/compost-fertilizer-making-machine/