What is the fermentation container of National pits 1573?

The fermentation vessel of National pits 1573 is mud pits.

National pits 1573 use mud pits as fermentation containers, and the main raw materials are only sorghum, multi-bacteria sealed yeast, distiller's grains and ingredients, which are continuously circulated and dry distilled in solid state at atmospheric pressure.

The mud pit used in National pits 1573 is inverted trapezoid. The four side walls of the trapezoid are called pit walls, which are reinforced with yellow mud paste from Wuduxi outside Luzhou City and nailed with nails. There are more microorganisms fermented in mud pits than in ponds, among which Acetobacter and Butyricum are two kinds of microorganisms that produce the main flavor of Luzhou-flavor.

Benefits of pit mud fermentation

Pit mud fermentation is the key to aroma production of Luzhou-flavor liquor. The older the pit, the more microorganisms involved in fermentation and aroma production in pit mud, and the more fragrant the wine produced. With the continuous use of pits, the microorganisms in the pit mud of old pits gradually become very orderly, and can "work together to produce fragrance", thus empowering the brewing of good wine.

The research showed that microorganisms from raw materials, Daqu, pit mud and environment gathered in pit mud, forming a highly complex and diverse brewing microbial community, and their "cooperation" created the unique style and characteristics of Luzhou-flavor wine. It is a summary of the traditional technology of Chinese brewing equipment to produce good wine in a century-old cellar, and the quality of pit mud is one of the key factors affecting the quality of Luzhou-flavor liquor.