Where is the moisture of the excreta in the fermentation bed?

Where is the moisture of the excreta in the fermentation bed?
A 20 square meter fermentation bed house is used to raise 15 finishing pigs as pigs. Each pig excretes 6 kilograms of excrement per day. Then there is 90 kilograms of excrement for one day. The fermentation bed is said to be “without clearing manure all year round”. How much feces will accumulate in a year? It can be calculated: 90*360=32,400 kilograms, 32 cubic meters per ton, which is enough to bury the entire house, but after one year of fermentation bed operation, we found that not only was the pigsty not covered by faeces. Instead, the 50-cm litter also sank more than a dozen centimeters. What's going on here? How can pig excrement disappear for no reason?
Fecal urine is not "for no reason" to disappear, they are by the strain of bacteria fermentation bed bacteria or eaten or broken down into other substances recycled by the animal, such as the water in the excrement, the pig's excrement in the urine Among them, fecal water content exceeds 70%, and the urine contains more water, more than 95%, that is, nearly 5 kg of water in the excreta. What are the ways to disperse these waters? Based on long-term practice and experimental data, the Golden Baby technicians are summarized as follows: Most of the water in pig manure is absorbed by sawdust. Part of the water participates in the life metabolic activities of microorganisms and synthesizes organic substances such as carbohydrates, proteins, and lipids in the microorganisms. These substances are re-entered into the gastrointestinal tract of pigs through the pig's archivorous activity and are digested, absorbed and utilized by the animals. In addition, most of the water is heated by the heat in the fermentation bed to become water vapor lost, so the fermentation bed should be ventilated and breathable in summer and winter.

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