As a result of hydrogasification methane and ethane are produced. Since the water content of organic matter can be substantial, aqueous processing is used when the energy required for drying the material would be inordinately large as compared to the energy content of the product formed. Types of Aqueous Processes Are . . . Chemical reduction is used to yield fuel oil or natural gas substitutes. Alcoholic fermentation does not require chemical oxygen.
Fermentation is a biologically-mediated reaction performed by certain yeasts, bacteria, and fungi.
An important example of the alcoholic fermentation process is the production of ethanol. In the digestion process, carbon, hydrogen, and, oxygen are removed while lignin and lignin protected organics, microbial organics, and soluble inorganics are preserved.