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首页> 外文会议>International biohydrometallurgy symposium >The effect of CO2 availability on the growth, iron oxidation and CO2 fixation rates of pure cultures of Leptospirillum ferriphilum and Acidithiobacillus ferrooxidans
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The effect of CO2 availability on the growth, iron oxidation and CO2 fixation rates of pure cultures of Leptospirillum ferriphilum and Acidithiobacillus ferrooxidans

机译：可用CO2对纯铁钩端螺旋体和酸性氧化铁硫杆菌培养物生长，铁氧化和CO2固定率的影响

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The effect of CO2 availability on the growth, iron oxidation and CO2 fixation rates of pure cultures of Acidithiobacillus ferrooxidans and Leptospirillum ferriphilum was investigated in a batch stirred tank system to determine the minimum concentrations required to promote bacterial growth from a stationary culture and investigate the relationship between CO2 availability and culture performance. The minimum inlet CO2 concentrations required to promote the growth of At. ferrooxidans and L. ferriphilum were 25 ppm and 70 ppm, respectively, under these conditions. The maximum growth rate of At. ferrooxidans increased with increasing inlet CO2 concentration up to 100 ppm and decreased thereafter. However, the amount of CO2 fixed per new cell produced increased with increasing C02 concentration above 100 ppm. The amount of iron oxidised per new cell produced decreased with increasing CO2 inlet concentration up to 100 ppm, whereafter it increased with increasing CO2 concentrations above 240 ppm. At inlet CO2 concentrations greater than 240 ppm new cell numbers produced decreased, while total C02 fixed by the culture remained the same. The maximum growth rate of L. ferriphilum increased with increasing inlet C02 concentration up to 160 ppm, after which there was no substantial change. The amount of iron oxidised and CO2 fixed per new L. ferriphilum cell was less affected by inlet CO2 concentration, but showed similar trends to At. ferrooxidans. Where an actively growing L.ferriphilum inoculum was used, the maximum growth, CO2 fixation and iron oxidation rates were higher at lower inlet C02 concentrations. The maximum CO2 fixation rates of both organisms increased with increasing inlet CO2 concentration up to ~ 160 ppm, stabilising thereafter. Maximum iron oxidation rates followed a similar trend, but continued to increase steadily with increasing inlet CO2 concentrations greater than ~ 160 ppm. The differences in the way these two organisms respond to CO2 availability can be correlated with differences in their CO2 fixation pathways. At. ferrooxidans performed better than L. ferriphilum at lower CO2 availabilities, and was less affected by CO2 starvation.
机译：在分批搅拌罐系统中研究了CO2可用性对酸性氧化铁硫杆菌和铁钩端螺旋体纯培养物生长，铁氧化和CO2固着率的影响，以确定促进固定培养物中细菌生长所需的最低浓度并研究其关系二氧化碳的供应量和培养性能之间的关系。促进At生长所需的最低入口CO2浓度。在这些条件下，四氧化三铁和费氏乳杆菌分别为25 ppm和70 ppm。 At的最大增长率。随着入口CO2浓度的增加，铁氧烷增加至100 ppm，此后降低。然而，随着CO 2浓度增加到100ppm以上，每个新电池产生的固定CO 2量增加。每个新电池产生的氧化铁量随CO2进口浓度增加到100 ppm而降低，此后随CO2浓度增加到240 ppm以上而增加。在入口CO2浓度大于240 ppm时，产生的新细胞数减少，而由培养物固定的总CO2保持不变。随着入口CO 2浓度增加至160 ppm，铁杆乳杆菌的最大生长速率增加，此后没有实质性变化。每个新的L. ferriphilum细胞氧化的铁和固定的CO2量受入口CO2浓度的影响较小，但显示出与At类似的趋势。亚铁氧化物。在使用活跃生长的费氏乳杆菌接种物的情况下，在较低的入口CO 2浓度下，最大生长，CO 2固定和铁氧化速率较高。两种生物的最大CO2固定率随着入口CO2浓度的增加而增加，最高可达〜160 ppm，此后稳定。最大的铁氧化速率也遵循类似的趋势，但是随着入口CO2浓度的增加（大于〜160 ppm）而持续稳定地增加。这两种生物体对CO2利用率的反应方式的差异可能与它们的CO2固定途径的差异有关。在。在较低的CO2利用率下，四氧化三铁的性能优于L. ferriphilum，并且受CO2饥饿的影响较小。

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