Producing fuel ethanol from energy hygrophyte duckweed.

Through the component analysis of 15 kind of duckweeds,3 high starch varities were screened out: Spirodela oligorrhiza S3,S1 and Spirodela polyrhiza V7,the corresponding starch contents was 47.86%,41.45% and 39.69%.According to the structural characteristic of duckweed,hydrolysis efficiency of enzymatic hydrolysis and different concentrations of acid hydrolysis,was compared,then the hydrolysis technology was confirmed when the boiling water bath for 2 h and acid concentration was 4 mol/L,the hydrolysis efficiency reached 93.52%.Through studying on ethanol fermentation found out the reason that hydrolyte of duckweed couldn't be fermented normally and the fermentation efficiency of ethanol reached 91.83% when using water extracts of hydrolyte.