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首页> 外文期刊>Environmental toxicology and chemistry >KINETICS OF BENZENE BIODEGRADATION BY PSEUDOMONAS AERUGINOSA: PARAMETER ESTIMATION
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KINETICS OF BENZENE BIODEGRADATION BY PSEUDOMONAS AERUGINOSA: PARAMETER ESTIMATION

机译：铜绿假单胞菌生物降解苯的动力学：参数估计

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This study determined the model parameters describing biodegradation of benzene by conducting kinetic microcosm batch tests in both pure solution and saturated aquifer material conditions for various initial benzene (100―700 mg/L) and microbial concentrations (10~7―10~9 colony-forming units [CFU]/ml) using Pseudomonas aeruginosa as benzene-degrading bacteria. In both tests, benzene and microbial concentrations were monitored over time in order to investigate which of two Monod kinetic equations, the Monod-with-growth or the Monod-no-growth model, was more suitable for describing benzene biodegradation and to estimate the associated model parameters. Parameter estimation was performed by fitting the numerical solution of each model obtained by the fourth-order Runge-Kutta integration to the measured data of benzene and/or microbial concentrations. For the Monod-with-growth model, the best fit of the numerical solution was significantly different than the measured benzene concentrations, especially at early times, because of the gradual increase of microbial population in the growth curve. In contrast, the solution based on the Monod-no-growth model produced reasonable agreement with the measured benzene data. The estimated parameters of maximum substrate utilization rate (k_(max)) and half-saturation constant (K_c) were in the range of 61 to 105 mg/L/d and about 270 mg/L, respectively, which differ significantly from values previously reported in the literature. We attribute the differences observed in our study to our experimental conditions of initial substrate and bacterial concentrations and oxygen and nutrient supply. Our results imply that an appropriate model type and reasonable values of kinetic parameters should be chosen to model the biodegradation of hydrocarbons in the subsurface environment.
机译：本研究通过在纯溶液和饱和含水层材料条件下对各种初始苯（100〜700 mg / L）和微生物浓度（10〜7〜10〜9菌落浓度）​​进行动力学缩微分批试验，确定了描述苯生物降解的模型参数。铜绿假单胞菌作为降解苯的细菌（CFU] / ml）。在这两个测试中，随时间监测苯和微生物的浓度，以研究两个Monod动力学方程（Monod-with-growth或Monod-no-growth模型）中的哪一个更适合描述苯的生物降解并估算相关的模型参数。通过将通过四阶Runge-Kutta积分获得的每个模型的数值解与苯和/或微生物浓度的测量数据拟合，可以进行参数估计。对于具有增长的Monod模型，数值解决方案的最佳拟合与测得的苯浓度显着不同，尤其是在早期，这是因为生长曲线中微生物种群的逐渐增加。相反，基于Monod-no-growth模型的解决方案与测得的苯数据产生了合理的一致性。最大底物利用率（k_（max））和半饱和常数（K_c）的估计参数分别在61至105 mg / L / d和约270 mg / L的范围内，与先前的值明显不同文献报道。我们将研究中观察到的差异归因于初始底物和细菌浓度以及氧气和养分供应的实验条件。我们的结果表明，应该选择合适的模型类型和合理的动力学参数值来模拟地下环境中碳氢化合物的生物降解。

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