가압을 통한 도시형 생활 폐기물 기반 합성가스발효 공정 개발

Abstract

Global efforts are focused on achieving carbon neutrality due to the increases in the levels of greenhouse gases. Moreover, the greenhouse gases generated from the disposal of municipal solid waste (MSW) are the primary sources of emissions inSouth Korea. In this study, we conducted the biological conversion of syngas (CO, H2, and CO2) generated from MSW gasification. The MSW-derived syngas was used as a feed source for cultivating Eubacterium limosum KIST612, and pressurization was employedto enhance gas solubility in culture broth. However, the pH of the medium decreased owing to the pressurization because of the CO2 inthe syngas and the cultivation-associated organic acid production. The replacement of conventional HEPES buffer with a phosphatebuffer led to an approximately 2.5-fold increase in acetic acid concentration. Furthermore, compared with the control group, thepressurized reactor exhibited a maximum 8.28-fold increase in the CO consumption rate and a 3.8-fold increase in the H2 consumptionrate.