共查询到18条相似文献,搜索用时 46 毫秒
1.
对氧化还原电位法在氧化亚铁硫杆菌培养过程中的应用进行了探索性的研究,维持总铁浓度为10g/L,通过改变Fe(Ⅱ)与Fe(Ⅲ)的比例,找出E与Ln(Fe^3+/Fe^2+)的线性关系和培养液的处理条件。结果表明,在无菌体系中,当Fe&3+/Fe^2+的比值范围为0.5-10时,二者的线性关系较好,并发现当培养基的消耗小于40%时对E与Fe^3+/Fe^2+的关系影响不大。进而考察了在氧化亚铁硫杆菌生物氧化过程中E与Fe^3+/Fe^2+的关系,通过加酸对培养液稀释40倍然后加热处理,发现了E与Ln(Fe^3+/Fe^2+)的线性关系,进而确定了能斯特方程中的参数Eo和RT/nF的大小。与无菌体系的参数进行了比较,相对误差小于1%。 相似文献
2.
3.
氧化亚铁硫杆菌烟气脱硫实验研究 总被引:5,自引:0,他引:5
将分离筛选得到的氧化亚铁硫杆菌固定在生物滴滤塔的陶粒填料上,和循环液中的铁离子组成生物滴滤塔脱硫系统,本文研究了该反应系统脱除烟气中SO2的工艺条件和处理效果。 相似文献
4.
研究了自行选育的氧化亚铁硫杆菌的生长特性。结果表明:我们自行选育培养的脱硫自养菌氧化亚铁硫杆菌,在特定条件下具有快速高效将Fe^2+转化为Fe^3+的功能,通过氧化亚铁硫杆菌生长因素的研究,确定了其生长的最佳条件,即在细菌处于对数生长期时,按10%接种量接种,调节培养液pH为2.5左右,30℃时振荡培养,氧化亚铁硫杆菌的生长活性最佳。通过考察培养过程中Fe^3+浓度的变化,测定了不同接种量时氧化亚铁硫杆菌的氧化性能参数μ。 相似文献
5.
6.
氧化亚铁硫杆菌浸出镍黄铁矿机理的初步分析 总被引:9,自引:1,他引:9
对生物浸出镍黄铁矿的过程进行了研究,得到以下一些结论:(1) 吸附在矿物表面的细菌对矿物的溶解起着最重要的作用,溶液中游离菌的作用较小,而Fe3+对镍黄铁矿的化学溶解作用较弱;(2) Fe2+主要是被溶液中的游离菌氧化的;(3) 硫的不完全氧化将导致溶液pH的升高. 相似文献
7.
采用不同尺寸的木屑和圆柱状的活性炭作为氧化亚铁硫杆菌的固定化载体,构建了固定床生物反应器.实验考察了间歇操作下的通气速率、连续操作下的稀释率等参数对反应器中氧化亚铁硫杆菌菌膜氧化Fe2 过程的影响.实验结果表明,在0.65 L固定床反应器中,以尺寸为12 mm×5 mm×1 mm的木屑作为固定化载体,控制通气速率为1.4 L/min,稀释率为1.1 h-1时,可获得最大Fe2 平均氧化速率5.83 g/(L·h).对不同载体的氧化亚铁硫杆菌固定化以及Fe2 氧化情况做出了对比. 相似文献
8.
9.
氧化亚铁硫杆菌(Thiobacillus ferrooxidans,简称T.f菌)在工业和环保领域具有重要的经济和社会意义。本文介绍了T.f菌的生理特性以及它在烟气脱硫中的应用。 相似文献
10.
11.
Carol A. Jones D. P. Kelly 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1983,33(4):241-261
Thiobacillus ferrooxidans was grown at pH 1.6 in continuous flow chemostat culture on ferrous sulphate as growth limiting substrate at dilution rates between 0.02–1.33 h?1. Iron oxidation and growth were subject to product inhibition by ferric iron and under some conditions substrate inhibition by ferrous iron. Product inhibition could be predominantly competitive or non-competitive, and the mode observed depended partly on previous steady state conditions. The inhibition phenomena resulted in unique anomalous washout curves and complex relationships between steady-state substrate, product and biomass concentrations, for which mathematical models are developed. For the growth states subject to non-competitive inhibition by Fe3+ at D 0.073–0.99 h?1, the growth yield coefficient corrected for maintenance (YG) was 1.33 g dry wt (g atom Fe2+ oxidized)?1 and the maintenance coefficient (m) was 0.43 g atom Fe2+ oxidized (g dry wt)?1 h?1). For predominantly competitive states (D, 0.05–0.268 h?1) with 2–70 mM Fe3+ in steady states, YG was 0.36–0.38 and m was 0–0.04. A consequence of product inhibition and substrate inhibition was the possibility of more than one steady state product value and yield for a single steady state substate concentration. This was demonstrated experimentally. Substrate saturation coefficient, Ks (giving half maximum specific growth rate) for Fe2+, was 0.7–2.4 mM and maximum specific growth rate (μm) 1.25–1.78 h?1. The results presented reveal unusual and novel properties of T. ferrooxidans relevant to describing its activities in natural environments or in mineral leaching systems. 相似文献
12.
本文探讨了硫酸亚铁与硫酸亚铁铵在酸性介质中,溶液不稳定性机理,并提出了不稳定性的改进办法。 相似文献
13.
Mehdi Nemati Colin Webb 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》1999,74(6):562-570
Thiobacillus ferrooxidans immobilised in biomass support particles with activated carbon coating were used in a packed‐bed bioreactor to study the combined effects of chemical and biological catalysis on the oxidation of ferrous iron. The effect of ferrous iron concentration (in the range 5–30 kg m−3) and of its volumetric loading on the kinetics of reaction were investigated. With low concentrations of ferrous iron, 5–10 kg m−3, the combined catalysis did not offer a significant advantage to oxidation of ferrous iron and the kinetics of reaction were slightly faster than those achieved with just the biological catalyst. With ferrous iron at a concentration of 20 kg m−3, the combination of chemical and biological catalysis resulted in a remarkable enhancement of the reaction rate. The maximum oxidation rate of ferrous iron in the presence of combined catalysts, 21.9 kg m−3 h−1, was twice as high as that achieved with just the biological catalyst. © 1999 Society of Chemical Industry 相似文献
14.
15.
16.
化能自养型硫杆菌脱硫机制及脱硫策略 总被引:2,自引:0,他引:2
介绍了对化能自养型硫杆菌氧化煤中黄铁矿硫机制的认识过程,讨论了黄铁矿生物氧化机制的新观点:主要包括黄铁矿生物氧化的电化学本质、黄铁矿表面吸附细菌的功能、黄铁矿生物氧化的具体反应途径。采用氧化还原电势或[Fe3+]/[Fe2+]比建立的速率方程可用于描述化能自养型硫杆菌的生物氧化过程,其中中间产物元素硫的进一步氧化可能是限速步骤。针对目前黄铁矿生物氧化机制的新认识,提出了提高煤系黄铁矿硫生物脱除效率的研究策略。此外,如研究证实元素硫为超高硫煤中有机相硫的一部分,化能自养型硫杆菌也将能用于脱除煤中该部分有机硫。 相似文献
17.