Enhanced bioconversion of hydrogen and carbon dioxide to methane using a micro-nano sparger system: mass balance and energy consumption.

Simultaneous CO removal with renewable biofuel production can be achieved by methanogens through conversion of CO and H into CH. However, the low gas-liquid mass transfer ( ) of H limits the commercial application of this bioconversion. This study tested and compared the gas-liquid mass transfer of H by using two stirred tank reactors (STRs) equipped with a micro-nano sparger (MNS) and common micro sparger (CMS), respectively.

Biomethanation of blast furnace gas using anaerobic granular sludge addition of hydrogen.

The high concentrations of CO (toxic) and CO (greenhouse gases) in blast furnace gas (a by-product of steelworks) reflect its low calorific value. In this study, anaerobic granular sludge was used to convert carbon from blast furnace gas to methane exogenous hydrogen addition. The inhibition of methane production by CO partial pressure ( ) was found to start from 0.