초록
Hydrogen (H<SUB>2</SUB>) production through biological routes is an eco-friendly process. Dark-fermentative or photosynthetic pathways have been widely studied to produce H<SUB>2</SUB>. In these cases yields up to 3.8 mol H<SUB>2</SUB>/mol glucose have been reported to be produced under dark-fermentative conditions by Enterobacter, Caldicellulosiruptor and Thermotoga spp., or through photo-fermentative route by bacteria such as Rhodopseudomonas spp. A combination of the two systems allows a 2-fold increase in H<SUB>2</SUB> yield. The need is to increase the efficiency of the whole process to yield 12 mol H<SUB>2</SUB>/mol glucose. In this review, we propose that metabolic activities of bacteria may be complemented to use biowaste as feed for increasing the efficiency of H<SUB>2</SUB> production process. Further utilization of intermediates of these two processes for polyhydroxyalkanoate and methane production is likely to increase the feasibility of meeting the ever increasing energy demand.