For thousands of large-scale pig farms, a pig consumes 1-2kg of concentrate feed and 10-20 kg of water every ten days on average. The sewage is mixed with pig manure and excreted from the pig farm. A pig farm with tens of thousands of heads will produce hundreds of tons of manure every day, which is difficult to treat with the traditional way of returning to the field. Due to poor storage and management, a large amount of livestock and poultry manure is discharged randomly, which seriously pollutes the surrounding environmental sanitation and affects the sustainable development of the livestock and poultry breeding industry.
At present, human beings have higher and higher requirements for environmental protection, and the treatment of manure from livestock and poultry farms has become a hot issue of great concern to the whole society. In order to realize the harmless and resourceful treatment of livestock and poultry manure, the methods of aerobic composting and anaerobic fermentation are relatively common and effective methods for the treatment of livestock and poultry manure in the world today. The amount of feces discharged from large-scale farms is relatively large. Especially in recent years, some pig farm owners have adopted the "water-soaked manure" process in order to save labor costs.
Its pig manure is soaked in pig urine, so that the amount of excrement from the farm to be treated is larger and the concentration of TS is higher. Therefore, advanced fermentation technology is applied in the process of manure treatment to carry out comprehensive utilization of livestock and poultry manure. The important precondition is that the fecal sewage must be pre-treated with solid-liquid separation. Mainly to reduce the concentration of TS in sewage. Manure screw press separator has been widely used.