In the process of wine production, a large amount of distillers’ grains will be produced. These distillers’ grains with high water content are easy to rot during storage, which not only waste resources, but also produce a pungent odor, resulting in a large number of distiller’s grains being discarded at will. However, spent grains can not only be processed into feed, but also are ideal raw materials for organic fertilizer.

Fermented fertilizer of distiller’s grains contains a large number of lactic acid bacteria, yeast and other complex bacteria, which is an ideal organic fertilizer fermentation agent. It can not only greatly shorten the fermentation time, but also kill the residual bacteria and eggs, improve the nutrition of organic fertilizer and increase the number of beneficial microorganisms. Making spent grains into fertilizer can not only supplement soil organic matter, but also keep the soil soft, promote soil particle structure, greatly improve the use efficiency of fertilizer, and save costs.
The organic content of distiller’s grains can be better improved after processing. The common treatment method is to dehydrate and dry distiller’s grains with a spent grain dryer, and then conduct deep processing. The vinasse with high water content shall be properly dehydrated, and then transported to the rotary dryer when the water reaches a certain range. Under the action of the inner lifting board, the distiller’s grains keep turning up, fully contacting with the hot air flow in the drum, so as to achieve the drying effect.