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《Fuel Processing Technology》1994,40(2-3):269-275
The annual SO2 emission is approx. 0.6 million tons in Hungary because of the high amount of sulphur in the power plant coals. Since Hungary has signed the European Environmental Agreement, the high sulphur emission has to be gradually reduced. To overcome the acid rain problem, the biodesulphurization of Hungarian power plant coals has also been started in Hungary. The R&D programe of biodesulphurization has been launched in 1990. According to our findings the biodesulphurization process is a suitable tool for reducing the pyritic sulphur content in lignite and sub-bituminous coal. 相似文献
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Bioleaching of refractory gold ore ( Ⅱ )——Mechanism on bioleaching of arsenopyrite by Thiobacillus ferrooxidans 总被引:1,自引:2,他引:1
1 INTRODUCTIONBioleachingprocesseshavebeenusedextensivelytorecoverbasemetals (mainlycopper)anduraniumfromlow gradeoresandmorerecen 相似文献
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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
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李曼 《武汉纺织工学院学报》2009,(2):12-16
随着办研究氧化亚铁硫杆菌结果表明,最佳培养温度为30℃左右,最佳生长pH为2.0~2.5,最佳生长初始Fe2+浓为0115mol/L左右,在进行细菌培养时接种量取10%比较恰当。低pH值和高浓度Fe2+驯化后,在培养温度30℃、初始pH值1.5、初始Fe2+浓度25g/L条件下,氧化亚铁硫杆菌仍能保持一定的Fe2+氧化活性,6天Fe2+氧化率可达82.28%,Fe2+平均氧化速率达3.43g/L/d,pH值的变化是先上升后下降,最后稳定在1.81。 相似文献
6.
A new method of processing and manufacturing certain parts of instruments through biological approach is studied. Knowledge of feasibility of micro-manufacturing is obtained by comparing experimental results of etching surfaces of copper, aluminium alloy, brass, steel and stainless steel using strain of Thiobacillus ferrooxidans (T.f.). Our experimental results show that certain metals can be etched using T.f., the most feasible material is copper, followed by brass, etc., with stainless steel the least. The surface of the stainless steel material is nearly unchanged during surface-etching. Micro parts made of copper or brass can be satisfactorily processed with T.f. and the rate of processing on copper is about 14?μm/h. Furthermore, surface roughness and processing speed are controlled by pH value and temperature of etching liquid, in addition to swing rate of the the swing bed. 相似文献
7.
黄铁矿微生物浸出体系中的表面热力学和扩展DLVO理论 总被引:3,自引:1,他引:3
根据Young s方程的推导公式结合接触角的测定结果计算黄铁矿和氧化亚铁硫杆菌的表面能参数。结果表明,氧化亚铁硫杆菌的表面能明显高于黄铁矿的表面能。应用热力学计算氧化亚铁硫杆菌在黄铁矿表面吸附的自由能,发现其吸附自由能为正值,无法解释氧化亚铁硫杆菌在黄铁矿表面的吸附现象,而通过扩展DLVO理论建立的Lifshitz-van der Waals(LW)、Lewis acid-base(AB)和静电(EL)作用自由能与作用距离(d)之间的势能曲线,能够准确的预言氧化亚铁硫杆菌在黄铁矿表面的吸附现象。 相似文献
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Thiobacillus ferrooxidans might be the most important bacteria used in biometallurgy. The foundation way of its growth process is oxidizing ferrous in order to obtain energy needed for metabolism, but the variation of ferrous concentration and mixed potential of the culture media would have crucial effect on the bacteria growth.Based on the characteristics of Thiobacillus ferrooxidans growth and redox potential of ferric and ferrous, an electrochemical cell was designed conventionally to study growth rule and the relationship between redox potential and bacteria growth was built up, and some growth kinetics of Thiobacillus ferrooxidans were elucidated. It demonstrates that the variation of open potential of electrochemical cell ΔE shows the growth tendency of Thiobacillus ferrooxidans, at the initial growth stage, the value of ΔE increases slowly, when at logistic growth stage, it increases drastically, and the growth rate of bacteria is linear with the oxidation rate of ferrous. The bacteria growth kinetics model is proposed using Monod and Michealis-Menten equation, and the kinetics parameters are got. The consistence of the measured and the calculated results proves that it is proper to use the proposed kinetics model and the electrochemical cell method to describe the growth rule of Thiobacillus ferrooxidans. 相似文献
10.
Thiobacillus ferrooxidans might be the most important bacteria used in biometallurgy. The foundation way of its growth process is oxidizing ferrous
in order to obtain energy needed for metabolism, but the variation of ferrous concentration and mixed potential of the culture
media would have crucial effect on the bacteria growth. Based on the characteristics of Thiobacillus ferroxidans growth and redox potential of ferric and ferrous, an electrochemical cell was designed conventionally to study growth rule
and the relationship between redox potential and bacteria growth was built up, and some growth kinetics of Thiobacillus ferrooxidans were elucidated. It demonstrates that the variation of open potential of electrochemical cell ΔE shows the growth tendency of Thiobacillus ferrooxidans, at the initial growth stage, the value of δE increases slowly, when at logistic growth stage, it increases drastically, and the growth rate of bacteria is linear with
the oxidation rate of ferrous. The bacteria growth kinetics model is proposed using Monod and Michealis-Menten equation, and
the kinetics parameters are got. The consistence of the measured and the calculated results proves that it is proper to use
the proposed kinetics model and the electrochemical cell method to describe the growth rule of Thiobacillus ferrooxidans.
Foundation item: Project (50204001) supported by the National Science Foundation of China 相似文献