Modeling of biological clogging in unsaturated porous media

Soleimani, Sahar; Geel, Paul J. Van; Isgor, O. Burkan; Mostafa, M.

doi:10.1016/j.jconhyd.2008.12.007

Cited by 44 publications

(37 citation statements)

References 20 publications

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“…Understanding biofilm growth in porous media environment is relevant to several environmental and industrial processes such as biological wastewater treatment 10 , maintaining well-bore integrity in situations such as CO 2 capture 11 and plugging of pores in soil 12 .…”

Section: Introductionmentioning

confidence: 99%

Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars

Hassanpourfard

Sun

Valiei

et al. 2014

JoVE

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Several bacterial species possess the ability to attach to surfaces and colonize them in the form of thin films called biofilms. Biofilms that grow in porous media are relevant to several industrial and environmental processes such as wastewater treatment and CO 2 sequestration. We used Pseudomonas fluorescens, a Gram-negative aerobic bacterium, to investigate biofilm formation in a microfluidic device that mimics porous media. The microfluidic device consists of an array of micro-posts, which were fabricated using soft-lithography. Subsequently, biofilm formation in these devices with flow was investigated and we demonstrate the formation of filamentous biofilms known as streamers in our device. The detailed protocols for fabrication and assembly of microfluidic device are provided here along with the bacterial culture protocols. Detailed procedures for experimentation with the microfluidic device are also presented along with representative results. Video LinkThe video component of this article can be found at

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Section: Introductionmentioning

confidence: 99%

Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars

Hassanpourfard

Sun

Valiei

et al. 2014

JoVE

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“…Bacteria and substrate are continuously injected into the reservoir with the same rate. In the literature related to both enhanced oil recovery and wastewater treatment, many different injection concentrations are used ranging from 10 −5 to 10 kg of substrate per cubic meter [10,14,56,59,61]. We have chosen a substrate mass fraction from the higher concentration range.…”

Section: Parameters and Initial Conditionsmentioning

confidence: 99%

Microbial enhanced oil recovery—a modeling study of the potential of spore-forming bacteria

2015

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Microbial enhanced oil recovery (MEOR) utilizes microbes for enhancing the recovery by several mechanisms, among which the most studied are the following: (1) reduction of oil-water interfacial tension (IFT) by the produced biosurfactant and (2) selective plugging by microbes and metabolic products. One of the ways of bacterial survival and propagation under harsh reservoir conditions is formation of spores. A model has been developed that accounts for bacterial growth, substrate consumption, surfactant production, attachment/filtering out, sporulation, and reactivation. Application of spore-forming bacteria is an advantageous novelty of the present approach. The mathematical setup is a set of 1D transport equations involving reactions and attachment. Characteristic sigmoidal curves are used to describe sporulation and reactivation in response to substrate concentrations. The role of surfactant is modification of the relative permeabilities by decreasing the interfacial tension. Attachment of bacteria reduces the pore space available for flow, i.e., the effective porosity and permeability. Clogging of specific areas may occur. An extensive study of the MEOR on the basis of the developed model has resulted in the following conclusions. In order to obtain sufficient local concentrations of surfactant, substantial amounts of substrate should be supplied; however, massive growth of bacteria increases the risk for clogging at the well inlet areas, causing injectivity loss. In such areas, starvation may cause sporulation, reducing the risk of clogging. Substrate released during sporulation can be utilized by attached vegetative bacteria and they will continue growing and producing surfactant, which prolongs the effect of the injected substrate. The simulation scenarios show that application of the spore-forming bacteria gives a higher total production of surfactant and the reduced risk of clogging, leading to an increased period of production and a higher oil recovery.

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“…24 The tibia and femur were harvested from 6-8-week-old Sprague-Dawley female rats (Orient. Co. Ltd., Young-In, Korea).…”

Section: Rat Bone Marrow-derived Primary Cellsmentioning

confidence: 99%

Reciprocal Regulation of Adipocyte and Osteoblast Differentiation of Mesenchymal Stem Cells byEupatorium japonicumPrevents Bone Loss and Adiposity Increase in Osteoporotic Rats

Kim

Jang²,

Lee³

et al. 2014

Journal of Medicinal Food

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Pathological increases in adipogenic potential with decreases in osteogenic differentiation occur in osteoporotic bone marrow cells. Previous studies have shown that bioactive materials isolated from natural products can reciprocally regulate adipogenic and osteogenic fates of bone marrow cells. In this study, we showed that Eupatorium japonicum stem extracts (EJE) suppressed lipid accumulation and inhibited the expression of adipocyte markers in multipotent C3H10T1/2 and primary bone marrow cells. Conversely, EJE stimulated alkaline phosphatase activity and induced the expression of osteoblast markers in C3H10T1/2 and primary bone marrow cells. Daily oral administration of 50 mg/kg of EJE for 6 weeks to ovariectomized rats prevented body weight increase and bone mineral density decrease. Finally, activity-guided fractionation led to the identification of coumaric acid and coumaric acid methyl ester as bioactive anti-adipogenic and pro-osteogenic components in EJE. Taken together, our data indicate a promising possibility of E. japonicum as a functional food and as a therapeutic intervention for preventing osteoporosis and bone fractures.

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Modeling of biological clogging in unsaturated porous media

Cited by 44 publications

References 20 publications

Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars

Protocol for Biofilm Streamer Formation in a Microfluidic Device with Micro-pillars

Microbial enhanced oil recovery—a modeling study of the potential of spore-forming bacteria

Reciprocal Regulation of Adipocyte and Osteoblast Differentiation of Mesenchymal Stem Cells byEupatorium japonicumPrevents Bone Loss and Adiposity Increase in Osteoporotic Rats

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