Bioproduction of acetic acid from carbon dioxide as single substrate and zero valent iron (ZVI) by clostridia

Developing innovative bioprocess strategies for carbon capture and utilization has been a major focus of research over the past decade as way creating more resilient world. In this study, zero-valent iron (ZVI) was utilized to generate hydrogen, which then an electron donor CO2 reduction by either Clostridium aceticum or carboxidivorans. For bioprocess, early acidic condition in reactors facilitated hydrogen production thereby acetic acid accumulation, contrast later acidification, elucidating role pH ZVI-CO2 bioconversion. Acetic produced single end product process both batch bottle studies with no control well reactor regulation. This is, best our knowledge, first report on selective pure bioconversion clostridia, ZVI. order minimize costs, scrap rather than ZVI can be used scaling-up. By lowering 6.6 C. aceticum, 75 g/L ZVI, some ethanol (125 mg/L) also observed, besides acid. studies, maximum concentration about 2 obtained at concentrations 50 g/L. Thus, dosage medium have effect metabolites generated during utilization.