Univ Lyon, INSA Lyon, DEEP, EA7429, 69621 Villeurbanne, France.
TBI, University of Toulouse, INSA, INRAE, CNRS, Toulouse, France.
Bioresour Technol. 2021 Oct;338:125548. doi: 10.1016/j.biortech.2021.125548. Epub 2021 Jul 14.
In a circular economy approach, heterogeneous wastes can be upgraded to energy in the form of syngas via pyrogasification, and then to methane via biomethanation. Working at high pressure is a promising approach to intensify the process and to reduce gas-liquid transfer limitations. However, raising the pressure could lead to reaching the CO inhibition threshold of the microorganisms involved in syngas-biomethanation. To investigate the impact on pressure on the process, a 10L continuous stirred tank reactor working at 4 bars and 55 °C was implemented. Syngas (40% CO, 40% H, 20% CO) biomethanation was performed successfully and methane productivity as high as 6.8 mmol/L/h with almost full conversion of CO (97%) and H (98%) was achieved. CO inhibition was investigated and carboxydotrophs appeared less resistant to high CO exposition than methanogens.
在循环经济方法中，通过热解气化可以将异质废物转化为合成气形式的能源，然后通过生物甲烷化转化为甲烷。在高压下工作是一种有前途的强化工艺和减少气液传质限制的方法。然而，提高压力可能导致达到参与合成气-生物甲烷化的微生物的 CO 抑制阈值。为了研究压力对该过程的影响，实施了一个在 4 巴和 55°C 下工作的 10L 连续搅拌釜反应器。成功地进行了合成气（40%CO、40%H、20%CO）的生物甲烷化，甲烷生产率高达 6.8mmol/L/h，CO（97%）和 H（98%）的转化率几乎达到 100%。研究了 CO 抑制作用，发现羧化菌对高 CO 暴露的抵抗力比产甲烷菌差。
