Abstract
The article provides an analysis of the performed experiments on mechanical dewatering of manure by a press and a centrifuge. It was determined that 2.5-3.5 tons of liquid can be removed from 10 tons of manure with 70% moisture. It is known that the mechanical method of removing moisture from manure saves a significant amount of thermal energy in comparison with the thermal method, which is moisture evaporation. However, along with water, nutrients dissolved in it, especially nitrogen, are removed from the manure. The subsequent use of nitrogen-depleted manure as fuel is beneficial because less nitrogen oxide is released into the atmosphere. Moreover, when coal is added to the manure, it is possible to intensify this process. Up to 44% of nitrogen, up to 41% of phosphorus and up to 35% of potassium pass into the liquid fraction. Such liquid can be used for foliar feeding of plants with a close arrangement of sowing crops. When using manure as a fertilizer, it is more expedient not to use mechanical dewatering, but to perform thermal drying with simultaneous disinfection from pathogenic microflora and weed seeds. To exclude formation of manure lumps with an outside crust and some droppings that didn’t undergo disinfection, it must be pre-mixed with dry droppings or sawdust.
Highlights
Due to the uneven location of poultry farms on the territory of the Russian Federation, the density of poultry per 1 hectare reaches 5-10 livestock units, with an ecologically safe level - 2 livestock units
It is known that the method of mechanical dewatering of manure saves a significant amount of thermal energy in comparison with the thermal method - moisture evaporation
With mechanical preliminary dewatering of manure from ⁓70% to ⁓ 50%, the amount of thermal energy for heating the manure ⁓ from 20°C to 100°C is significantly reduced for evaporation of ⁓300 liters of water from each ton of manure
Summary
Due to the uneven location of poultry farms on the territory of the Russian Federation, the density of poultry per 1 hectare reaches 5-10 livestock units, with an ecologically safe level - 2 livestock units. The rationale for the standard was carried out in terms of the amount of feed consumed, according to our calculations, in terms of the yield of basic nutrients for plants from cow manure and chicken droppings - 1 livestock unit equals 150-200 hens. Challenges arise - to reduce the amount of nitrogen in the manure intended for firing, to preserve this nitrogen for the production of fertilizer, to reduce the cost of dewatering and transportation over long distances. To solve these problems, experiments were carried out at the Federal Scientific Center ‘All-Russian Research and Technological Poultry Institute’ of the Russian Academy of Sciences. It is known that the method of mechanical dewatering of manure saves a significant amount of thermal energy in comparison with the thermal method - moisture evaporation
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
