Biomethane yield

The biomethane yield can be increased significantly by codigestion of organic wastes (Parry and Evans, 2012). However, the transportation of waste influences this effect negatively. In order to achieve a sustainable waste treatment strategy, the transportation of the wastes should be minimized. 

The effect of pressure on biphasic fermentations has been reported for extremely thermophilic organisms (34), supercritical and compressed solvent extractions (35-37), biomethanation of synthesis gases (38), biohydrogenations (39), and bacteria for enhanced oil recovery (40). Fermentation in the presence of compressed and SCF CO2 has been conducted with a goal of using pressurized CO2 as an in situ extraction solvent. Extractive fermentation using compressed solvents could prevent toxicity due to the buildup of a fermentation product—in particular, ethanol—and greatly enhance the yield... 

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