Patent ID: 8227219

Claim:
A method of producing ethanol comprising: a. supplying feed stock into a first container, wherein said feed stock contains at least one type of sugar; b. measuring the sugar concentration of said feed stock; c. adjusting said sugar concentration of said feed stock to fall within a predetermined range; d. introducing said feed stock from said first container into a bio-reactor, wherein said bio-reactor comprises: (i) a second container; (ii) at least one substrate disposed within said second container, wherein said at least one substrate is inoculated with at least one microbial population, preselected for fermentation capability, and said at least one microbial population propagates on the surface of said at least one substrate; e. supplying oxygen to said bio-reactor and said at least one microbial population; and f. fermenting said feed stock within said bio-reactor to generate ethanol.