Method for preparing red vinasse acid by utilizing two-step fermentation method

The invention relates to the field of biological fermentation, in particular to a method for preparing red vinasse acid by utilizing a two-step fermentation method. The invention discloses a method for preparing red vinasse acid by adopting a two-step fermentation method. The method comprises two fermentation stages: in the first stage, a screened and purified monascus strain is selected to realize large-scale and sustainable production of fresh red vinasse; the mature period of the stage is 2-4 days, and the stage is not limited by weather conditions and supports large-scale continuous operation. And in the second stage, the fresh red vinasse is subjected to rapid acid production pickling by adopting high-quality flavor lactic acid bacteria. The red vinasse acid prepared by the method is mellow in flavor, long in shelf life and stable in quality. Through several days of fermentation treatment, the red vinasse acid product with excellent taste, stable quality and long shelf life can be obtained. Besides, in t