排序方式: 共有3条查询结果,搜索用时 15 毫秒
1
1.
Zhenya Zhang Taisheng Quan Pomin Li Yansheng Zhang Norio Sugiura Takaaki Maekawa 《Applied biochemistry and biotechnology》2004,115(1-3):1033-1039
We studied biogas fermentation from alcohol waste fluid to evaluate the anaerobic digestion process and the production of
vitamin B12 as a byproduct. Anaerobic digestion using acclimated methanogens was performed using the continuously stirred tank reactor
(CSTR) and fixed-bed reactor packed with rock wool as carrier material at 55°C. We also studied the effects of metal ions
added to the culture broth on methane and vitamin B12 formation. Vitamin B12 production was 2.92 mg/L in the broth of the fixed-bed reactor, twice that of the CSTR. The optimum concentrations of trace
metal ions added to the culture liquid for methane and vitamin B12 production were 1.0 and 8 mL/L for the CSTR and fixed-bed reactor, respectively. Furthermore, an effective method for extracting
and purifying vitamin B12 from digested fluid was developed. 相似文献
2.
Temperature and Inoculum Origin Influence the Performance of Ex-Situ Biological Hydrogen Methanation
Nomie Figeac Eric Trably Nicolas Bernet Jean-Philippe Delgens Renaud Escudi 《Molecules (Basel, Switzerland)》2020,25(23)
The conversion of H2 into methane can be carried out by microorganisms in a process so-called biomethanation. In ex-situ biomethanation H2 and CO2 gas are exogenous to the system. One of the main limitations of the biomethanation process is the low gas-liquid transfer rate and solubility of H2 which are strongly influenced by the temperature. Hydrogenotrophic methanogens that are responsible for the biomethanation reaction are also very sensitive to temperature variations. The aim of this work was to evaluate the impact of temperature on batch biomethanation process in mixed culture. The performances of mesophilic and thermophilic inocula were assessed at 4 temperatures (24, 35, 55 and 65 °C). A negative impact of the low temperature (24 °C) was observed on microbial kinetics. Although methane production rate was higher at 55 and 65 °C (respectively 290 ± 55 and 309 ± 109 mL CH4/L.day for the mesophilic inoculum) than at 24 and 35 °C (respectively 156 ± 41 and 253 ± 51 mL CH4/L.day), the instability of the system substantially increased, likely because of a strong dominance of only Methanothermobacter species. Considering the maximal methane production rates and their stability all along the experiments, an optimal temperature range of 35 °C or 55 °C is recommended to operate ex-situ biomethanation process. 相似文献
3.
Vega J. L. Klasson K. T. Kimmel D. E. Clausen E. C. Gaddy J. L. 《Applied biochemistry and biotechnology》1990,(1):329-340
Anaerobic bacteria have been shown to be capable of converting CO, H2, and CO2 in synthesis gas to valuable products, such as acetate, methane, and ethanol. However, synthesis gas also contains small
quantities of sulfur gases such as H2S and COS, that may inhibit the performance of these organisms. This paper compares the performance of several CO-utilizing
and methanogenic bacteria in converting CO, CO2, and H2 to products in the presence of various concentrations of H2S and COS. The sulfur gas toxicity levels, growth, substrate uptake, and product formation for each organism are compared. 相似文献
1