The temperature of the culture media affects the syngas fermentation in two ways. Firstly, it affects the growth kinetics and secondly, it affects the solubility of the syngas in aqueous medium. In most cases, the temperature of the culture media is decided based on the specific microorganism. The most favorable growth temperature for mesophilic microorganisms is 37-40 °C, while for thermophilic microbes, it is between 55 and 80 °C.

4.5 Types of Microorganism

Strict anaerobe, C. Ijungdahlii is one of the most studied microorganisms in syngas fermen­tation. Apart from C. Ijungdahlii, several other strict anaerobic mesophilic microbes have been identified that are capable of fermenting syngas into biofuels. Some of these microbes include C. aceticum, A. woodii, C. autoethanogenum, and C. carboxydivorans (Klasson et al., 1992; Rajagopalan et al., 2002; Younesi, et al., 2005). Significant efforts are being made to genetically engineer syngas-fermenting microbes to improve the yield.