For the traditional fermentation method, vigorous post-fermentation process will be beneficial to meet the above conditions, because vigorous post-fermentation can produce a lot of CO2, and when CO2 is discharged from the tank (open fermentation), a lot of volatile raw alcoholic substances can be removed.

Cylindrical-conical fermentation tank is a universal fermentation tank in the world. The main body of the tank is cylindrical, the top of the tank is arc-shaped, and the bottom is cone-shaped. It has a considerable height (height is greater than the diameter). It is a fully enclosed fermentation tank.