Not much,, the process of making ethanol from sugarcane bagasse (compound catalytic enzyme digestion) is described as follows:

Straw - crushed - pre-treated - inoculation --Enzymatic digestion 1 --Filtration --Enzymatic digestion 2 --Filtration --Inoculation --Fermentation --Primary distillation --Distillation --Ethanol

Seven tons of bagasse can produce one ton of 95% ethanol, and no sewage discharge; the cost per ton of ethanol than other raw materials such as corn, cassava, etc. lower than 1000 yuan.

The past is the use of sucrose hydrolysis fermentation, high cost.