Interactions Between Bacteria And Solid Surfaces In Relation To Bacterial Transport In Porous Media
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Interactions Between Bacteria And Solid Surfaces In Relation To Bacterial Transport In Porous Media
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Author : H. H. M.. Rijnaarts
language : en
Publisher:
Release Date : 1994
Interactions Between Bacteria And Solid Surfaces In Relation To Bacterial Transport In Porous Media written by H. H. M.. Rijnaarts and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Bio Colloidal Transfer In Saturated And Unsaturated Porous Media
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Author : Hongjuan Bai
language : en
Publisher:
Release Date : 2017
Bio Colloidal Transfer In Saturated And Unsaturated Porous Media written by Hongjuan Bai and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The investigation of the transport and retention of bacteria in porous media has a great practical importance in environmental applications, such as protection of the surface and groundwater supplies from contamination, risk assessment from microorganisms in groundwater, and soil bioremediation. The aim of this study is to gain a fundamental understanding of the mechanisms that control bacteria transport and deposition in saturated and unsaturated porous media. Laboratory tracer and bacteria transport experiments at Darcy scale were performed in three porous media with distinct pore size distribution in order to investigate and quantify water and bacteria transport process under steady state flow conditions. A conservative solute was used as water tracer to characterize water flow pathways through porous media. A gram negative, motile Escherichia coli, a gram negative, non-motile Klebsiella sp. and a gram positive, non-motile R. rhodochrous were selected for the transport experiments. Characterization of cell properties (such as cell size and shape, zeta potential, motility and hydrophobicity) was performed for each strain. Numerical simulations with HYDRUS-1D code were performed to characterize water flow and to estimate bacteria transport and deposition parameters. The later were explored to identify bacteria flow patterns and physicochemical or physical mechanisms involved in bacteria deposition. To provide a better understanding of the mechanisms involved on bacteria transport and deposition, pore scale experiments were carried out by using microfluidic devices, designed for this purpose. The information obtained from laboratory experiments and numerical modeling was improved by theoretical calculation of different interactions between bacteria and porous media at air/water/solid interfaces. DLVO and non-DLVO interactions such as hydrophobic, steric, capillary and hydrodynamic forces involved in bacteria deposition were considered to describe bacteria-interface interactions in order to identify their relative impact on physicochemical and physical deposition of bacteria. Results obtained through both laboratory experiments and numerical simulationsoutlined non-uniform flow pathways, which were dependent on both grain/pore size as well as pore size distribution of the porous media. For a given porous medium, water flow patterns became more non-uniform and dispersive with decreasing water saturation due to the presence of air phase, which lead to an increase of the tortuosity of the flow pathways under unsaturated conditions. Bacteria transport pathways were different from the tracer transport, due to size exclusion of bacteria from smaller pore spaces and bacteria motility. Bacteria deposition was greatly influenced by pore network geometry, cell properties and water saturation degree. Both physical straining and physicochemical attachment should be taken into account to well describe bacteria deposition, but their importance on bacteria deposition is closely linked to porous media and cell properties. The results obtained in this work highlighted the simultaneous role of cell properties, pore size distribution and hydrodynamics of the porous media on bacteria transport and deposition mechanisms. The calculation of DLVO and non-DLVO interactions showed that bacteria deposition in saturated and unsaturated porous media was influenced by both kinds of interactions.
Soil And Groundwater Pollution
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Author : Alexander J.B. Zehnder
language : en
Publisher: Springer Science & Business Media
Release Date : 1995-11-30
Soil And Groundwater Pollution written by Alexander J.B. Zehnder and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-11-30 with Science categories.
SCOPE, the Scientific Committee on Problems of the Environment, was established by the International Council of Scientific Unions (ICSU) in 1969 as an international, non to governmental, non-profit organisation with the mandate - advance knowledge of the influence of humans on their environment, as well as the effects of these environmental changes upon people, their health and their welfare with particular attention to those influences and effects which are either global or shared by several nations; - to serve as a non-governmental, interdisciplinary and international council of scien tists and as a source of advice for the benefit of governments and intergovernmental and non-governmental bodies with respect to environmental problems. SCOPE has been established because critical environmental concerns call for a thor ough evaluation of the issues at stake, an assessment of their consequences at global and regional levels and the formulation of possible solutions. Through its activities SCOPE identifies available knowledge, then synthesizing it to point out where gaps and uncertainties exist, and to recommend where efforts should be concentrated to develop explanations and solutions.
Bacteria Transport Through Porous Material
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Author :
language : en
Publisher:
Release Date : 1989
Bacteria Transport Through Porous Material written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
The injection and penetration of bacteria into a reservoir is the most problematic and crucial of the steps in microbial enhanced recovery (MEOR). In the last phase of our work valuable information on bacterial transport in porous media was obtained. A great deal of progress was made to determine chemical bonding characteristics between adsorbed bacteria and the rock surfaces. In order to further enhance our knowledge of the effects of surface tensions on bacteria transport through porous media, a new approach was taken to illustrate the effect of liquid surface tension on bacterial transport through a sandpack column. Work in surface charge characterization of reservoir rock as a composite oxide system was also accomplished. In the last section of this report a mathematical model to simulate the simultaneous diffusion and growth of bacteria cells in a nutrient-enriched porous media is proposed.
Microbiology Of The Terrestrial Deep Subsurface
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Author : Penny S. Amy
language : en
Publisher: CRC Press
Release Date : 2018-01-10
Microbiology Of The Terrestrial Deep Subsurface written by Penny S. Amy and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-01-10 with Science categories.
Obtaining and analyzing samples is challenging in subsurface science. This first-of-its-kind reference book addresses accomplishments in this field-from drilling to sample work-up. A collaborative approach is taken, involving the efforts of microbiologists, geochemists, hydrologists, and drilling and mining experts to present a comprehensive view of subsurface research. The text provides practical information about obtaining, analyzing, and evaluating subsurface materials; the current status of subsurface microbial ecology; and describes several applications that will interest a variety of readers, including engineers, physical, and life scientists.
Contaminated Soil 95
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Author : W.J. van den Brink
language : en
Publisher: Springer
Release Date : 2013-12-21
Contaminated Soil 95 written by W.J. van den Brink and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-21 with Science categories.
These volumes contain the proceedings of the Fifth FZK/TNO Conference on Contaminated Soil. The themes discussed are as follows: 1. National and International Programmes. 2. Site Investigation. 3. Emission and Fate of Contaminants. 4. Characterization of Contaminated Soil. 5. Effects and Risks. 6. Standards and Protocols: Legal, Economic and Social Aspects. 7. Remediation of Contaminated Soil. 8. Sustainable Land Use. 9. Setting Priorities for Remediation Options. 10. Contributions from Workshops and Technical Sessions.
Interacting Processes In Soil Science
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Author : R.J. Wagenet
language : en
Publisher: CRC Press
Release Date : 2020-10-26
Interacting Processes In Soil Science written by R.J. Wagenet and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-10-26 with Technology & Engineering categories.
Interacting Processes in Soil Science focuses on coupled processes in soil. Topics covered in this important volume include the effects of inorganic salts upon water flow, modeling of sorption, transport and transformation of organic solutes, and the effects of microorganisms on silicate clay minerals. The book presents studies and approaches that can be extended and complemented by innovative work in the future. Interacting Processes in Soil Science will be an essential reference for all researchers and students in soil science, soil and water engineering, civil and environmental engineering, earth sciences, and hydrology.
Relationship Between The Adhesive Properties Of Bacteria And Their Transport And Colonization In The Subsurface Environment Final Report For Period September 15 1996 September 30 1999
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Author :
language : en
Publisher:
Release Date : 2000
Relationship Between The Adhesive Properties Of Bacteria And Their Transport And Colonization In The Subsurface Environment Final Report For Period September 15 1996 September 30 1999 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
This research has focused on the attachment of bacteria to solid surfaces and the significance of their adhesion properties in their transport through porous media. Our work has focused on strains of Pseudomonas and a related species Burkholderia cepacia. Most of our experimental strains were isolated from subsurface environments at USDOE experimental field sites. The first portion of this project was conducted at the University of Maryland during 1994-1996, during which two graduates and one graduate student were supported by the award. The project was then continued under contract number DE-FG02-96ER62302 at the University of South Carolina, where one postdoctoral associate has been supported by the award.
Environmental Geomechanics
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Author : Laurent Vulliet
language : en
Publisher: EPFL Press
Release Date : 2002-01-01
Environmental Geomechanics written by Laurent Vulliet and has been published by EPFL Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-01-01 with Ingeniería ambiental categories.
Bacterial Adhesion
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Author : M. Fletcher
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Bacterial Adhesion written by M. Fletcher and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Medical categories.
Study of the phenomena of bacterial adhesion to surfaces has accelerated considerably over the past 10 to 15 years. During this period, microbiologists have become increasingly aware that attachment to a substratum influences considerably the activities and structures of microbial cells. Moreover, in many cases attached communities of cells have important effects on their substratum and the surrounding environment. Such phenomena are now known to be important in plant and animal hosts, water and soil ecosystems, and man-made structures and industrial processes. Much work on microbial adhesion in the early 1970s was descriptive. Those studies were important for detecting and describing the phenomena of bacterial adhesion to substrata in various environments; the findings have been presented in numerous recently published, excellent books and reviews. In some studies, attempts were made to elucidate some funda mental principles controlling adhesion processes in different environments containing a variety of microorganisms. Common threads have been observed occasionally in different studies. Taken as a whole, however, the information has revealed that many disparate factors are involved in adhesion processes. Whether a particular microorganism can adhere to a certain substratum depends on the properties of the microbial strain itself and on charac teristics of the substratum and of the environment.