After the treatment of solid-liquid separation of livestock manure, the content of COD and BOD in manure water is greatly reduced, which saves a large amount of processing cost for the subsequent environmental protection standard discharge treatment. After solid-liquid separation and extrusion dewatering treatment, cow manure, pig manure, chicken manure and duck manure can be directly discharged to biogas digester for biogas fermentation, and after fermentation treatment, it can be used as organic fertilizer for tea garden, orchard, sugar cane, citrus, Chinese herbal medicine planting, vegetable greenhouse, rice field and other plants.

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