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首页> 外文学位 >Unsteady-state behaviour of an immobilized-cell fluidized-bed bioreactor for phenol biodegradation.
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Unsteady-state behaviour of an immobilized-cell fluidized-bed bioreactor for phenol biodegradation.

机译：固定化细胞流化床生物反应器用于苯酚生物降解的非稳态行为。

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The phenol biodegradation and microbial growth kinetics of suspended cultures of the psychrotrophic microorganism P. putida Q5 were modeled as a function of temperature in the range of 10 to 25°C. The Haldane parameter, K1, decreased with decreasing temperature, indicating the inhibition effect was stronger. The Luong model was found to better fit the kinetics of unacclimated cultures.; The response of an immobilized-cell fluidized-bed reactor (ICFBR) to step changes in phenol loading (ranging from 40 to 500% through step changes in either feed concentration or dilution rate) was investigated for a pure culture of Pseudomonas putida Q5. Two external-loop airlift ICFBRs containing biofilm-covered sand particles were operated at steady-state feed concentrations of 180 to 590 mg/L phenol and dilution rates from 0.025 to 0.069 h–1 at 10°C. Steady-state biofilm thicknesses ranged from 3 to 35 μm, depending upon the organic loading and the sand concentration (11–23 g/L). Two types of responses were noted. Low-level responses were characterized by a lack of response in the bulk phenol concentration. High-level responses were characterized by a rapid increase in the bulk phenol concentration and washout of the suspended biomass; the bioparticles were retained in the system.; A unique unsteady-state process model which simulated the response of all four process variables: the bulk phenol concentration, the suspended biomass concentration, the concentration profile of the substrate in the biofilm and the biofilm thickness, was implemented. Unique features included a balance on suspended cells, the consideration of an inactive fraction in the biofilm, and liquid-biofilm diffusional resistance and detachment. The model represented the wide range of conditions (described above) and the responses observed in four verification experiments, Accurate simulation of the experiments depended upon the use of kinetics determined using unacclimated suspended cells, as they were found to be more sensitive to phenol inhibition than the acclimated cultures. Also, growth rate hysteresis was included by adding a simple function that decreased the growth rate in proportion to the level of phenol present in the bulk fluid during a transient. The solution was simple enough to be used for future work with estimation and nonlinear control.
机译：精神营养微生物<斜体> P的悬浮培养物中苯酚的生物降解和微生物生长动力学。将putida Q5作为温度在10至25°C范围内的函数进行建模。 Haldane参数 K 1 随着温度降低而降低，表明其抑制作用更强。发现Luong模型更适合未适应文化的动力学。对于纯斜体假单胞菌培养物，研究了固定式细胞流化床反应器（ICFBR）对苯酚负荷逐步变化的反应（进料浓度或稀释率逐步变化的40％至500％） Q5。在10°C下，两种含生物膜覆盖的沙粒的外环空运ICFBR在稳态进料浓度为180至590 mg / L苯酚和0.025至0.069 hsuper-1的稀释速率下运行。稳态生物膜的厚度范围为3到35μm，具体取决于有机物含量和砂浓度（11–23 g / L）。注意到两种类型的响应。低水平响应的特征在于总酚浓度缺乏响应。高水平响应的特征是大量增加的苯酚浓度和悬浮生物质的洗脱；生物颗粒保留在系统中。实施了一个独特的非稳态过程模型，该模型模拟了所有四个过程变量的响应：总酚浓度，悬浮生物量浓度，生物膜中基质的浓度分布和生物膜厚度。独特的功能包括平衡悬浮细胞，考虑生物膜中无活性的部分以及液体生物膜的扩散阻力和分离。该模型代表了各种条件（如上所述）以及在四个验证实验中观察到的响应。实验的精确模拟取决于使用由未适应的悬浮细胞确定的动力学，因为发现它们对苯酚的抑制作用比对苯酚的抑制作用更为敏感。适应的文化。另外，通过添加一个简单的函数来包括生长速率滞后，该函数在瞬态过程中与本体流体中存在的苯酚水平成比例地降低了生长速率。该解决方案非常简单，可用于未来的估计和非线性控制工作。

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