Abstract：The effects of CO2 concentrations in headspace of anaerobic fermentation system on the volatile fatty acids (VFA) generation, substrate degradation and homoacetogen change were investigated. Low concentration of headspace CO2 was helpful for the substrate degradation. The substrate degradation efficiency of low CO2, high CO2 and control are over 93% at 16h, 87.6% and 88.3% at 20h, respectively. The high CO2 concentration improved the acetate accumulation with the conversion yield at 8.2 mmol/gCOD at the end of fermentation, which was 1.52 and 1.87 folds of the control and low CO2 reactors, respectively. There was a positive relationship between CO2 concentration and the quantity of homoacetogen. The fhs gene copy numbers were 9.83×106/mL, 5.32×108/mL, 6.97×107/mL in the low CO2, high CO2 and the control reactors, respectively. The homoacetogen could be enriched from a mixed culture by a high CO2 concentration in the headspace.
马琳, 王晋, 符波, 刘和. 顶空CO2对有机物厌氧发酵产挥发性脂肪酸的影响[J]. 中国环境科学, 2012, 32(4): 635-639.
MA Lin, WANG Jin, FU Bo, LIU He. Effects of CO2 in headspace of bioreactor on volatile fatty acids generation from organic matters by anaerobic fermentation. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(4): 635-639.