Biofilm Growth in Porous Media Well Approximated by Fractal Multirate Mass Transfer With Advective-Diffusive Solute Exchange

IF 4.6 1区 地球科学 Q2 ENVIRONMENTAL SCIENCES Water Resources Research Pub Date : 2024-11-06 DOI:10.1029/2023wr036872
Jingjing Wang, Jesús Carrera, Maarten W. Saaltink, Jordi Petchamé-Guerrero, Graciela S. Herrera, Cristina Valhondo
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Abstract

Biofilm growth in porous media changes not only the hydrodynamic properties of the medium (reduction in porosity and permeability, and increase in dispersivity), but also the transport itself (breakthrough curves display increasingly fast first arrivals and long tails). These features are well reproduced by multicontinuum models (Multi-Rate Mass Transfer, MRMT) which can be used to describe reactive transport in heterogeneous porous media and facilitate the simulation of reactions that are localized within biofilms. Here, we present a conceptual and numerical model of biochemical reactive transport with dynamic biofilm growth based on MRMT formulations. Mass exchange between mobile water and immobile biofilm aggregates is represented by a memory function, which simplifies definition of MRMT parameters. We successfully tested this model on two sets of laboratory data and found that (a) a basic model based on the growth of uniformly sized biofilm aggregates fails to reproduce laboratory tracer tests and rate of biofilm growth, while a fractal growth model, which we obtain by integrating the memory functions of biofilm aggregates with a power law distribution, does; (b) the biofilm memory function evolves as the biofilm grows; and (c) the early time portion of eluted volume tracer breakthrough curves are independent of flow rate, whereas the tail becomes heavier when the flow rate is decreased, which implies that both advection controlled and diffusion controlled mass exchange coexist in biofilms. These findings imply that porous media biofilms are essentially different from those developing in human tissues or open spaces.
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多孔介质中的生物膜生长可通过具有粘性-扩散性溶质交换的分形多隙缝传质得到很好的模拟
生物膜在多孔介质中的生长不仅改变了介质的流体动力特性(孔隙率和渗透率降低,分散性增加),而且还改变了传输本身(突破曲线显示出越来越快的初至速度和越来越长的尾巴)。多连续模型(多速率传质模型,MRMT)可以很好地再现这些特征,该模型可用于描述异质多孔介质中的反应传输,并有助于模拟生物膜内的局部反应。在此,我们介绍一种基于 MRMT 配方的生化反应传输概念和数值模型,该模型具有动态生物膜生长功能。流动的水和不动的生物膜聚集体之间的质量交换由记忆函数表示,从而简化了 MRMT 参数的定义。我们成功地在两组实验室数据上测试了这一模型,结果发现:(a) 基于大小一致的生物膜聚集体生长的基本模型无法再现实验室示踪试验和生物膜生长速度,而我们通过对生物膜聚集体的记忆函数进行幂律分布积分而得到的分形生长模型则可以再现;(c) 洗脱体积示踪剂突破曲线的早期时间部分与流速无关,而当流速降低时,尾部会变得更重,这意味着生物膜中同时存在平流控制和扩散控制的质量交换。这些发现意味着多孔介质生物膜与人体组织或开放空间中形成的生物膜有本质区别。
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来源期刊
Water Resources Research
Water Resources Research 环境科学-湖沼学
CiteScore
8.80
自引率
13.00%
发文量
599
审稿时长
3.5 months
期刊介绍: Water Resources Research (WRR) is an interdisciplinary journal that focuses on hydrology and water resources. It publishes original research in the natural and social sciences of water. It emphasizes the role of water in the Earth system, including physical, chemical, biological, and ecological processes in water resources research and management, including social, policy, and public health implications. It encompasses observational, experimental, theoretical, analytical, numerical, and data-driven approaches that advance the science of water and its management. Submissions are evaluated for their novelty, accuracy, significance, and broader implications of the findings.
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