Method for producing alcohol by aid of yellow ginger hydrolysis waste water

The invention relates to a method for producing alcohol by the aid of yellow ginger hydrolysis waste water. The method includes neutralizing the yellow ginger hydrolysis waste water by the aid of limestone so as to regulate a PH (potential of hydrogen) value of the waste water until the PH value reaches 2-3; regulating the PH value by the aid of alkali Ca(OH) or NaOH until the PH value reaches 3.8-4.5; fermenting the yellow ginger hydrolysis waste water by the aid of yeast and distilling the yellow ginger hydrolysis waste water to obtain the alcohol. The method has the advantages that the yellow ginger hydrolysis waste water generated in hydrolysate producing procedures in yellow ginger processing enterprises is comprehensively utilized by the aid of the method for producing the alcohol by the aid of the yellow ginger hydrolysis waste water and is used as a raw material, accordingly, the high-purity alcohol can be produced, the COD (chemical oxygen demand) content of the yellow ginger hydrolysis waste water can be greatly reduced, the technological method is simple, and the alcohol produced from the waste water is high in yield.