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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.
氧化亚铁硫杆菌制备聚合硫酸铁的工艺研究   总被引:3,自引:0,他引:3  
利用微生物氧化亚铁硫杆菌(T.f.)为催化剂,催化氧化Fe2+为Fe3+制备了聚合硫酸铁(PFS).并研究了氧化亚铁硫杆菌制备聚合硫酸铁的最佳工艺条件,在最佳工艺条件下制备的聚合硫酸铁具有较好的絮凝效果和对城市污水较好的去浊率.该方法生产工艺简单、成本低、无污染、不残留有毒物质,具有良好的经济和环境效益.  相似文献   

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.
蒋磊  余刚  杨慧群  赵丹 《广州化工》2012,40(22):14-15,43
目前国内SO2污染形势严峻,相比传统的脱硫技术,生物脱硫技术的反应条件温和、成本低、能耗少、脱硫速率快,具有明显的经济和技术优势,适合在生产实践中推广。氧化亚铁硫杆菌是生物脱硫中运用最广的细菌,本文介绍了该细菌在生物脱硫中的原理及其运用,并展望了生物脱硫技术的前景。  相似文献   

6.
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   

7.
氧化亚铁硫杆菌浸出镍黄铁矿机理的初步分析   总被引:10,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   

8.
贾果  玉玲 《河南化工》2010,27(10):71-71
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   

9.
刘政  龚权君  白郁山  刘丹  刘巧梅 《应用化工》2013,(12):2225-2228
以天冬氨酸为营养辅助因子,研究其对氧化亚铁硫杆菌生长及胞外多聚物成分的影响。结果表明,与对照组相比,最大菌体量提高17%,生长周期缩短了15 h;培养至23 h时,Fe2+氧化速率比对照高66.67%,环境pH提前15 h达到最低点,并降低8.72%。培养25 h后,胞外多聚物中蛋白质含量增加21.95%,多糖含量增加9.19%。添加天冬氨酸可有效促进氧化亚铁硫杆菌的生长,缩短生长周期;其可能的机理为其促进了氧化亚铁硫杆菌胞外多聚物中蛋白组分的表达。  相似文献   

10.
用单一的生物反应器处理硫化氢时,微生物容易受到硫化氢的毒害作用而使细胞活力受损,废气处理效率迅速降低。为此,提出生物和化学二级反应器处理硫化氢的新工艺,并对微生物的生长、分布、最适工艺运行条件和影响因素等做了研究。结果表明,生物反应器中微生物对亚铁离子的氧化速率对硫化氢的去除效果有着重要的影响,二级反应器工艺大大提高了硫化氢去除效率,反应的主要产物为单质硫,同时便于对硫沉淀的分离,在操作温度31℃,pH值1.5—1.8,水力停留时间2.5 h,进气质量浓度8 g/m3,硫化氢承载负荷2 000 g/(m3.h)以下时,系统可以稳定运行,硫化氢的脱除率可达99%以上。  相似文献   

11.
    
Biooxidation of ferrous iron (Fe2+) from strongly acidic industrial wastewater with a high Fe2+ content by Thiobacillus ferrooxidans in a packed bed reactor and subsequent removal of ferric iron (Fe3+) by a crossflow microfiltration (membrane) process have been investigated as functions of wastewater flowrate (54–672 cm3 h?1), Fe2+ concentration (1.01–8.06 g dm?3), and pH (1.5–5.0). A natural (vegetable) sponge, Luffa cylindrica, was used as support matrix material. The fastest kinetic performance achieved was about 40 g Fe2+ dm?3 h?1 at a true dilution rate of 19 h?1 corresponding to a hydraulic retention time of 3.16 min. Steady state conversion was observed to be about 10% higher at pH 2.3 than that at pH 1.5. Increasing the flowrate of the inlet wastewater caused a reduction in conversion rate. The oxidation rate reduced along the reactor height as the wastewater moved towards the exit at the top but conversion showed the opposite trend. Increasing Fe2+ concentration up to a critical point resulted in an increased oxidation rate but beyond the critical point caused the oxidation rate to decrease. Luffa cylindrica displayed suitable characteristics for use as a support matrix for formation of a Thiobacillus ferrooxidans biofilm and showed promising potential as an ecological and sustainable alternative to existing synthetic support materials. Membrane separation was shown to be a very effective means of Fe3+ removal from the wastewater with removal changing from 92% at pH 2.3 to complete removal at pH 5.0. Copyright © 2003 Society of Chemical Industry  相似文献   

12.
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   

13.
生物脱硫技术中,Fe2+氧化速率是制约整个脱硫工艺效率的关键因素。以两种尺寸的木屑作为固定化载体,分析了反应器中Fe2+氧化动力学。根据所推导的Fe2+氧化动力学方程,对Fe2+浓度随时间衰减的实验值进行非线性拟合分析,确定了反应器分别采用两种载体在最优通气速率下的Fe2+氧化反应级数,并分析了木屑载体(b)的氧化动力学参数对通气速率的变化规律。采用所确定的反应级数,根据连续操作下的动力学方程及Fe2+转化率随稀释率变化的关系确定了连续操作下的反应速率常数分别为0.9698 h-1·(g·L-1)0.1666、0.9042 h-1·(g·L-1)0.1135。动力学曲线与真实值之间的相关系数R2均在0.99以上,具有良好的预测性。  相似文献   

14.
黄铁矿脱硫菌生长和代谢的影响因素研究   总被引:1,自引:0,他引:1  
研究了氧化亚铁硫杆菌(简称T.f.菌)对几种氮源、能源的利用,以及空气中氧化不同时间的黄铁矿吸附菌的代谢活性。结果表明:在选择的3种氮源中,尿素经过诱导可被T.f.菌较好地利用,说明该菌可产生诱导性脲酶。在选择的能源中,Fe^2+是T.f.菌容易利用的能源基质。添加接种培养过的残留单质硫粉可提高菌体氧化单质硫的速率。在空气中氧化20d的黄铁矿对T.f.菌的吸附量增大,而且吸附菌体的亚铁氧化过程提前进行。  相似文献   

15.
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   

16.
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   

17.
It has been shown that the bacterium Thiobacillus ferrooxidans can solubilize MoS2 from coal liquefaction catalyst residues. The MoS2 is formed during the liquefaction process from a molybdenum catalyst precursor. MoS2 is insoluble; in order to be recovered and reused, it must be converted to a soluble form. T. ferrooxidans can oxidatively solubilize the molybdenum in MoS2 to molybdate, in which form it can be recovered as a soluble or HCl extractable material. Bioleaching experiments show that with a starting cell concentration of 1.0 × 107 cells ml−1, or greater, a significant amount of the molybdenum in the residue was solubilized. These experiments indicate that the amount of molybdenum biologically solubilized from the liquefaction residues is dependent on inoculum size, with all strains of T. ferrooxidans tested having equal ability, and on the particle size of the residue. An important factor in the solubilization of MoS2 by T. ferrooxidans is the inhibitory effect of molybdate. Literature reports that as little as 10 ppm molybdate is inhibitory to growth or ferrous iron oxidation. However, leachates containing in excess of 70 ppm molybdenum (equivalent to 116 ppm molybdate) were generated as a result of bioleaching of the liquefaction residue. When cells from previous leaching experiments were used to inoculate flasks containing fresh media and additional liquefaction residue, the bacteria were able to bioleach the fresh residue. Recent experiments have focused on the ability of T. ferrooxidans to produce protective agents in the leachate that minimize the inhibitory effects of molybdate. We found that production of the protective factor(s) did not depend on previous exposure of the cells to molybdenum or liquefaction residue.  相似文献   

18.
G. Loi  A. Mura  N. Passarini  P. Trois  G. Rossi 《Fuel》1993,72(12):1607-1611
Different particulate solids such as glass powder, various types of activated carbon and bentonite suspended in Thiobacillus ferrooxidans cultures produce very different effects on the oxidizing activity of the microorganism. The atmospheric oxygen uptake by Thiobacillus ferrooxidans in Warburg respirometer flasks containing 9K medium with ferrous sulfate as energy source and suspended bentonite is 2.8 times that in the absence of solids. The dissolution rate of pure pyrite in 250 cm3 shake flasks containing 9K medium and bentonite is considerably enhanced over that where the only solid phase is pyrite. Conversely, the oxidizing ability of the microorganism seems to be inhibited by all the activated carbons tested. The effect of ground glass seems to be related to its particle size distribution. Implications for the bioleaching of sulfide ores and coal pyrite are discussed in the light of current knowledge on the adsorption of Thiobacillus ferrooxidans cells on solid surfaces.  相似文献   

19.
生物浸出低品位镍铜硫化矿中的镍、铜、钴   总被引:13,自引:0,他引:13  
报道了硫杆菌在3种不同方式下浸出低品位镍铜硫化矿的实验结果. 采用通气气搅浸出,在15%矿浆浓度下,浸出20 d后,镍、铜、钴浸出率可分别达到95.4%, 48.6%和82.6%;采用通气搅拌浸出,在25%的矿浆浓度下,浸出14 d后,镍、铜、钴浸出率分别为80.2%, 45.2%和78.4%. 采用柱式渗滤浸出,在液固比为40:1情况下,浸出49 d后,镍、铜、钴浸出率分别为48.5%, 37.5%和33.6%.  相似文献   

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