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池汝安;黄晓慧;肖春桥;吴元欣;张文学 《中南大学学报(英文版)》2009,16(5)
The effects of Acidithiobacillus ferrooxidans (At. f) mutated with diethyl sulfate (DES) as a mutagen on the bioleaching of soluble phosphorus (P) from rock phosphate (RP) were investigated. The results show that the oxidative activity of At. f is greatly improved by 1.0% (volume fraction) of DES. Correspondingly, the highest leaching rate of soluble P is also obtained to be 14.9% by the At. f mutated, which is 85.8% higher than that of the adapted At. f without mutation. In addition, the SEM images are significantly performed that the corrosion of RP residue surfaces leached by 1.0% DES-induced At.f is much worse than that of leached by the adapted At. f. All the above indicate that the leaching efficiency of soluble P from RP with pyrite can be greatly improved by using DES-induced At. f to a certain extent. 相似文献
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A novel approach to bioleach soluble phosphorus from rock phosphate, involving the bio-oxidation of pyrite by adaptated Acidithiobacillus ferrooxidans (At. f) and the product of sulfuric acid to dissolve rock phosphate, has been proposed in this paper. The soluble phosphorus could be leached more effectively in the presence of pyrite by At. f than that leached directly by sulfuric acid. The optimal technological parameters are presented. The highest phosphorus leaching rate is 9.00% when the culture substrate is the mixture of FeSO4·7H2O and pyrite, the phosphorus leaching rate is 8.00% when the initial pH and culture time are 2.5 and 5 d, respectively. The optimal rock phosphate particle size is 0.05 mm for the leaching of phosphorus. The bigger the grains of pyrite, the lower the phosphorus leaching rate. The bacterium At. f should be appropriately adaptated, which makes it easier to bioleach soluble phosphorus from rock phosphate. 相似文献
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利用多波束测深、浅地层剖面和侧扫声纳探测资料对青岛崂山头海域侵蚀沟及海底滑坡的形态、成因进行分析讨论.全覆盖的多波束测深反映了侵蚀沟的形态特征,为分析侵蚀沟及滑坡的成因提供了依据.崂山头海底滑坡是由潮流冲蚀等外动力引起的平移滑坡.侧扫声纳清晰地反映了滑坡边界和滑塌挤压波纹,表明滑坡刚发生不久,还未被冲蚀.浅地层剖面呈现较完整的滑坡形态和结构特征,可识别出滑动体、滑动剪切面和拖曳层理等滑坡要素.结果表明高分辨率的多波束测深仪、浅地层剖面仪和侧扫声纳仪等声学设备对探测海底滑坡、分析其成因具有较好的效果,可为海洋防灾减灾,海洋工程建设提供参考依据. 相似文献
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以巨大芽孢杆菌和多粘芽孢杆菌为实验菌种,研究了不同磷矿粉用量、培养时间以及碳源物质和氮源物质的质量分数对细菌培养液中的磷浸出率和pH值的影响.结果表明:两株菌种均显著提高了细菌培养液中磷的浸出率,最高达到3.3%,且多粘芽孢杆菌的溶磷能力比巨大芽孢杆菌稍强.随着磷矿粉用量增加,磷的浸出率显著降低,pH值逐渐升高,但当磷矿粉用量超过10 g/L后,pH值稳定在一定水平.培养时间越长,磷的浸出率越高,到培养的第15 d达到最高值,此后不再明显升高.另外,碳源物质和氮源物质的质量分数在3%时磷的浸出率最高,质量分数过高或过低均抑制了磷的浸出. 相似文献
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风化壳淋积型稀土矿以铵盐为浸取剂的原地浸出过程会产生大量氨氮废水,进行脱氮处理方法有物化脱氮法和生物脱氮法。本文综述了氨氮废水不同脱氮方法。物化法适合预处理高浓度稀土矿山氨氮废水;生物脱氮法成本低、处理规模大、脱氮效率高且环境友好,适合处理低浓度氨氮废水。重点论述了厌氧氨氧化和异养硝化-好氧反硝化等新型生物脱氮法的脱氮机理、影响因素及其应用,为稀土矿山氨氮废水脱氮处理提供了一定的理论基础。相较于传统生物脱氮法,厌氧氨氧化和异养硝化-好氧反硝化更适合处理稀土矿山氨氮废水。通过利用现代分子生物学技术,深入研究厌氧氨氧化脱氮法稳定运行策略及异养硝化-好氧反硝化脱氮法脱氮工艺,有望实现稀土矿山氨氮废水低成本、高效脱氮。 相似文献
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综述了解磷微生物的种类及其解磷机理,归纳了近5年来利用解磷微生物分解中低品位磷矿的研究实践,并对解磷微生物在其他矿石中的应用研究进行了简单阐述。 相似文献
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The effects of Acidithiobacillus ferrooxidans (At. f) mutated with diethyl sulfate (DES) as a mutagen on the bioleaching of soluble phosphorus (P) from rock phosphate (RP) were
investigated. The results show that the oxidative activity of At. f is greatly improved by 1.0% (volume fraction) of DES. Correspondingly, the highest leaching rate of soluble P is also obtained
to be 14.9% by the At. f mutated, which is 85.8% higher than that of the adapted At. f without mutation. In addition, the SEM images are significantly performed that the corrosion of RP residue surfaces leached
by 1.0% DES-induced At.f is much worse than that of leached by the adapted At. f. All the above indicate that the leaching efficiency of soluble P from RP with pyrite can be greatly improved by using DES-induced
At. f to a certain extent. 相似文献
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以条件平差原理为基础,推导了求附合导线平差后的任一边方位角的中误差公式,传统的方法中,首先把方位角条件作为第一组条件式进行平差,然后利用第一组改正后的方位角改化二个坐标条件方程式即第二组条件式,最后解出附合导线平差后任一边方位角的权倒数,从而求出附合导线平差后任一边方位角的中误差;计算过程相当烦琐。与传统分组平差相比,本文采用的方法更简单,使学生更容易理解。 相似文献