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Author : H. H. M.. Rijnaarts
Publisher :
Page : 166 pages
File Size : 27,56 MB
Release : 1994
Category :
ISBN : 9789054852520
Author : Hongjuan Bai
Publisher :
Page : 0 pages
File Size : 42,95 MB
Release : 2017
Category :
ISBN :
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.
Author : Alexander J.B. Zehnder
Publisher : Springer Science & Business Media
Page : 170 pages
File Size : 21,83 MB
Release : 1995-11-30
Category : Science
ISBN : 9780792337430
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.
Author :
Publisher :
Page : 9 pages
File Size : 18,85 MB
Release : 2000
Category :
ISBN :
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.
Author : Penny S. Amy
Publisher : CRC Press
Page : 368 pages
File Size : 13,79 MB
Release : 2018-01-10
Category : Science
ISBN : 1351083015
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.
Author : R.J. Wagenet
Publisher : CRC Press
Page : 304 pages
File Size : 21,40 MB
Release : 2020-10-25
Category : Technology & Engineering
ISBN : 1000115127
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.
Author : W.J. van den Brink
Publisher : Springer
Page : 938 pages
File Size : 43,3 MB
Release : 2013-12-21
Category : Science
ISBN : 9401104212
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.
Author :
Publisher :
Page : pages
File Size : 17,40 MB
Release : 1989
Category :
ISBN :
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.
Author : Laurent Vulliet
Publisher : EPFL Press
Page : 446 pages
File Size : 24,22 MB
Release : 2002-01-01
Category : Ingeniería ambiental
ISBN : 9782880745158
Author : K. L. Mittal
Publisher : John Wiley & Sons
Page : 515 pages
File Size : 14,1 MB
Release : 2015-07-27
Category : Technology & Engineering
ISBN : 1119162327
This book is based on the 13 review articles written by subject experts and published in 2014 in the Journal Reviews of Adhesion and Adhesives. The rationale for publication of this book is that currently the RAA has limited circulation, so this book provides broad exposure and dissemination of the concise, critical, illuminating, and thought-provoking review articles. The subjects of the reviews fall into 4 general areas: 1. Polymer surface modification 2. Biomedical, pharmaceutical and dental fields 3. Adhesives and adhesive joints 4. General Adhesion Aspects The topics covered include: Adhesion of condensed bodies at microscale; imparting adhesion property to silicone material; functionally graded adhesively bonded joints; synthetic adhesives for wood panels; adhesion theories in wood adhesive bonding; adhesion and surface issues in biocomposites and bionanocomposites; adhesion phenomena in pharmaceutical products and applications of AFM; cyanoacrylate adhesives in surgical applications; ways to generate monosort functionalized polyolefin surfaces; nano-enhanced adhesives; bonding dissimilar materials in dentistry; flame treatment of polymeric materials—relevance to adhesion; and mucoadhesive polymers for enhancing retention of ocular drug delivery.