共查询到19条相似文献,搜索用时 85 毫秒
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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
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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
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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
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苏云金杆菌在环隙气升式内环流反应器中深层发酵特性研究 总被引:6,自引:0,他引:6
在建立的 4.7L 环隙气升式内环流反应器中研究了 Bt菌的深层发酵特性 ,通过对生长曲线、溶氧(DO)曲线、p H曲线、总糖曲线、还原糖曲线和氨基氮曲线的分析发现 ,在整个发酵过程中碳源和氮源的供给是充足的 ,但溶氧供应不足 ,是 Bt发酵的限制性因素。文章还考察了同一亚种不同菌株及不同亚种对该系统的适应性 ,并与机械搅拌罐发酵进行了对比。实验表明 ,环隙气升式内环流反应器体系优于机械搅拌罐 ,适合 Bt菌发酵 相似文献
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从强化传质与节能方面概述了近年来国内外在气升式反应器结构参数优化、操作参数的优化及溶液性质等方面的研究工作 ,提出了今后的研究方向 相似文献
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三相搅拌气升式内环流反应器中葡萄糖氧化表观反应动力学研究 总被引:7,自引:0,他引:7
在三相搅拌气升式气反应中研究了气体流速、机械搅拌速度和氧浓度等参数对葡萄糖氧化反应过程的影响。根据多相催化反应Langmuir-Hinshelwood模型导出反应器中氧气、葡萄糖、葡萄糖酸的质量平衡微分方程,利用柔性单纯形法优化算出该反应系统的传质系数kLa和参数α,得到氧的动力学级数α约为0.6。 相似文献
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使用欧拉两流体模型研究气体分布器结构对气升式环流反应器内气液两相流动的影响,预测了环己烷氧化反应器内单环结构、三环结构、五环结构的气体分布器时反应器内液相速度分布、气含率分布、液相循环速度以及液相微观混合特性.模拟结果表明,在等量的进气流量下,气体分布器环数增加,液相速度分布和气含率分布更趋均匀;气体分布器环数增加,液相推动力增加,从而使得液相循环速度增加,液相的宏观混合效果增强;气体分布器环数增加,导流筒内外的平均气含率增加.随机游走模型模拟结果表明,气升式环流反应器与普通鼓泡床反应器对气体分布器结构要求不同. 相似文献
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A new process for the direct chlorination of 2-chloro-5-methylpyridine to yield 2-chloro-5-chloro-methylpyridine in an airlift loop reactor (ALR) has been studied.Five main reaction conditions including TR,na/ns,cp,Qg and dD/dR were optimized.The average molar yield and purity of 2-chloro-5-chloromethylpyridine obtained were 79% and 98.5% respectively under the optimum operating conditions.Finally,the efficiency for the preparation of 2-chloro-50chloromethylpyridine with ALR and stirred tank reactor(STR) respectively was compared. 相似文献
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《分离科学与技术》2012,47(7):1632-1641
Abstract New, efficient, and a cheap method for the removal of ferrous ion from aqueous in a fluidized bed reactor was developed. Different from the adsorption process in the treatment of iron species, the immobilization of iron oxide on support media in a fluidized bed never reaches saturation. Furthermore, the immobilized iron oxide is reusable in catalysis and adsorption. Silica sand (Si) and iron oxide (SiG) were employed as support media to remove Fe(II) from aqueous in a fluidized bed reactor. The oxidation rate of Fe(II) and the immobilization rate of iron oxide are strongly depend on pH value so the variation of solution pH is considered to be the major parameter. Furthermore, the aeration effect on iron removal efficiency is investigated. 97% of total iron was removed at pH 8 in the presence of SiG and 87% of total iron was removed at pH 6 in the presence of Si. When the initial pH was adjusted to 6 and was not adjusted during the reactions, the optimum total iron removal efficiency (97%) was found. The air aeration was provided to keep the dissolved oxygen in constant. Aeration air accelerates the oxidation of ferrous ion, but does not improve the total iron removal efficiency. 相似文献
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The promoting effect of ultrasonic wave on the hydrodynamics and mass transfer characteristics of the loop airlift reactor was studied. The gas holdup, liquid circulation velocity, mixing time and overall volumetric mass transfer coefficient were examined and compared, with and without ultrasonic wave in the reactor. The experimental results show that ultrasound has almost no notable effect on the gas holdup, but has a tendency to decrease gradually the liquid circulation velocity and increase the overall volumetric mass transfer coefficient; and the effect on the mixing time is relatively complex. At low superficial gas velocity, the low powered ultrasound promotes the radial mixing of fluid; with the ultrasonic power increasing, ultrasonic vibration obstructs the axial mixing of fluid. Moreover, the effect of ultrasonic wave on the mixing time gradually decreases with the increase in the superficial gas velocity. Therefore there exists an optimal ultrasonic power for hydrodynamics and mass transfer. Correlations were also proposed for the hydrodynamics and mass transfer characteristics of the reactor. 相似文献
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The local hydrodynamic behaviours in an external loop airlift slurry reactor, including the gas holdup, bubble rise velocity, bubble size, were measured with a fibre optic probe. The liquid circulation velocity was measured with an ultrasound Doppler velocimetry. Two‐dimensional simulations were carried out in the framework of Two‐Fluid formulation coupled with a k‐? turbulence model. The lateral forces and interphase turbulence were taken into account and good agreement between the experimental and simulation results was obtained. The simulations show that the lateral forces and interphase turbulence have noticeable influence and should be included in the CFD model. 相似文献
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气升式环流反应器的理论研究进展 总被引:6,自引:0,他引:6
概述了气升式环流反应器的流体力学模型,对工程实用性较强的气液两流体模型和气泡导致的湍动模型进行了分类,并对常见相间作用力模型和多相流求解技术进行了总结和评价. 指出将Favre平均的两流体模型和采用Sato模型考虑气泡导致湍动的k-e模型相结合是现阶段气升式环流反应器设计和放大的有力工具. 在分析了气液两相流理论现状的基础上,指出了其存在的问题和进一步的研究方向. 相似文献
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以对二甲苯(PX)液相催化氧化反应器的连续鼓泡釜模型,对尾氧浓度保持3.5%时不同进气氧浓度下的反应器进行了模拟。模拟计算发现反应温度随着进气氧浓度的增加而升高,可以通过减少塔顶抽出水量或降低反应压力维持反应釜温度不变。较高的氧浓度进气对反应器操作的影响主要表现在温度效应和浓度效应上,温度效应使得主反应的速率增加,浓度效应却降低主反应的速率。随着进气氧浓度的增加,温度效应和浓度效应共同作用的结果是氧化反应器的生产能力先增大后减小,因此存在一个适宜的进气氧浓度,由计算得到为26.6%。 相似文献