Biogas Upgrading Using Clostridium Autoethanogenum for Value-Added Products

• DOI: 10.2139/ssrn.4098287
• Publication Date: 2022-05-03T03:07:59Z
• Authors: James Kemp Heffernan; Chun-Yu Lai; Axayacatl Gonzale...; Lars Keld Nielsen; Jianhua Guo; Esteban Marcellin
• Keywords: Biogas; Value (mathematics)

Biogas production from anaerobic digestion is a well-established bioprocess for energy generation, nutrient recovery, and valorisation of waste resources. Typical biogas contains 60% methane 40% carbon dioxide (CH 4 /CO 2 1.5). Removing or altering content facilitates use as biomethane due to its impact on the calorific value. Technologies that effectively remove convert could play central role in transforming This important world transitions into low circular economy. Gas fermentation utilising acetogens renewable H offers an under-explored biological alternative upgrading. To demonstrate gas upgrading, we used Clostridium autoethanogenum ferment CO synthetic supplemented with produce ethanol acetate (2.8 ±0.1 3.9 g/L, respectively). The was able enrich 2.20 ±0.05) transform valuable fuels chemicals one-step process. Strikingly, ~50% off-gas inert, meaning there potential optimising acetogenic achieve complete streams. Increasing liquid mass transfer improved culture's growth rate stability, but biomass titres remained unaffected during chemostat operation. represents step towards upgrading other low-grade streams by hydrogen sustainable platform technology.