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Growth kinetic and transport of mixed microbial cultures in subsurface environments
Advances in Water Resources ( IF 4.7 ) Pub Date : 2021-04-27 , DOI: 10.1016/j.advwatres.2021.103929
Moein Jahanbani Veshareh , Hamidreza M. Nick

Subsurface porous environments harbor various microbial communities that control ecosystem functions such as geochemical cycling, bioremediation and ore formation. To simulate bioprocesses derived by microbial communities, Monod equation and cardinal models are utilized to model growth kinetics dependency on substrate concentration and temperature, respectively. In this work, we illustrate that Monod equation with constant parameters cannot characterize community derived microbial processes. Additionally, the growth-temperature dependency of a community of microorganisms does not follow a specific mathematical model. We suggest an equivalent strain model that can estimate the rate of community-derived metabolisms (RCDM) in non-isothermal reactive transport processes. We consider a one-dimensional flow system with four different simulation scenarios of immobile biomass-limited electron donor, mobile biomass-limited electron donor, immobile biomass-unlimited electron donor and mobile biomass-unlimited electron donor. We illustrate that the equivalent strain can efficiently characterize (with absolute normalized deviation (AND)<4%) the behavior of the test community when electron donor availability is limited. In contrast to the limited electron donor availability cases, we show that the equivalent strain is not capable of characterizing the test community when electron donor is abundant, leading to a maximum AND of 70%. The deviation of the equivalent strain from the test community is due to the inability of the equivalent strain to represent the effects of community evolution on RCDM and biomass deactivation that happens due to temperature variations.



中文翻译:

地下环境中混合微生物培养物的生长动力学和运输

地下多孔环境拥有控制地球化学循环、生物修复和矿石形成等生态系统功能的各种微生物群落。为了模拟微生物群落衍生的生物过程,Monod 方程和基数模型分别用于模拟生长动力学对底物浓度和温度的依赖性。在这项工作中,我们说明了具有恒定参数的 Monod 方程不能表征群落衍生的微生物过程。此外,微生物群落的生长温度依赖性不遵循特定的数学模型。我们建议使用等效应变模型来估计非等温反应性运输过程中群落衍生代谢 (RCDM) 的速率。我们考虑具有固定生物质有限电子供体、移动生物质有限电子供体、固定生物质无限电子供体和移动生物质无限电子供体四种不同模拟场景的一维流动系统。我们说明当电子供体可用性有限时,等效应变可以有效地表征(绝对归一化偏差 (AND) < 4%)测试社区的行为。与有限的电子供体可用性情况相反,我们表明当电子供体丰富时,等效应变无法表征测试群落,导致最大 AND 为 70%。

更新日期:2021-05-31
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