Download or read book Transport of Bacteria in Unsaturated Porous Media written by and published by . This book was released on 1998 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bio colloidal Transfer in Saturated and Unsaturated Porous Media written by Hongjuan Bai and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Bacterial transport in variably saturated porous media PHD written by David Gordon Jewett and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interactions Between Microbial Dynamics Water Flow and Solute Transport in Unsaturated Porous Media written by Rockie R. Yarwood and published by . This book was released on 2001 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioremediation in the vadose zone is unpredictable because of poor understanding of factors influencing microbial growth in this environment. A lab-scale experimental system was developed to examine, noninvasively, interactions between microbial growth, water flow, and solute transport in unsaturated porous media. Measurements of microbial colonization, and its impact on hydrology, were facilitated by using the luxCDABE-containing reporter bacterium Pseudomonas fluorescens HK44 and digital CCD imaging. Experiments were conducted in glass-walled two-dimensional flow cells (45 x 50 x 1 cm) packed with silica sand. Several bioengineering problems associated with chamber design and function required solution before microbial experiments were successful. These included: choice of materials for chamber components; development of sterilization, packing, and inoculation protocols; and development of procedures for data collection and chamber maintenance during experiments lasting several days. Bacterial growth was mapped daily by quantifying development of salicylate-induced bioluminescence. A model relating the rate of increase in light emission after induction successfully predicted microbial densities over four orders of magnitude (R2=0.95) provided that sufficient oxygen for the bioluminescence reaction was available. Total model-predicted growth during a one-week experiment agreed with potential growth calculated from the mass-balance of the system and previously established kinetic parameters (predicted, 1.2x1012 cells; calculated, 1.7x1012 cells). Although the rate of expansion of the colonized zone (and predicted populations in newly colonized regions) remained relatively constant, the proportion of the daily potential growth remaining within the chamber declined over time. Monitoring of bioluminescence revealed the development of an (hypothesized) anaerobic zone associated with microbial growth in the unsaturated porous media. Water content and flow streams were measured using light transmission. Accumulation of microbial growth modified the hydrologic properties of the sand causing up to 50% decrease in saturation within the colonized zone, diversion of flow around the colonized zone, and lowering (5 cm) of the capillary fringe height. Apparent solute velocity through the colonized region was reduced from 0.39 cm min−1 (R2=0.99) to 0.25 cm min−1 (R2=0.99). These experiments provide proof-of-concept for combining light transmission and bioluminescence technologies to study interactions between microbial growth and hydrology in unsaturated porous media.
Download or read book Transport of Bacteria in Porous Media written by Yunhu Tan and published by . This book was released on 1989 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pollutants in Porous Media written by B. Yaron and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unsaturated zone is the medium through which pollutants move from the soil surface to groundwater. Polluting substances are subjected to complex physical, chemical and biological transformations while moving through the unsaturated zone and their displacement depends on the transport properties of the water-air porous medium system. Pollution caused by human activities, agriculture, and industry, has brought about a growing interest in the role of the unsaturated zone in groundwater pollution. Due to the complexity and the multidisciplinary nature of the subject, it is being investigated by specialists from various scientific disciplines, such as soil physicists, chemists, biologists, and environmental engineers. This state of affairs has motivated the initiative taken by the Water Quality Commissions of IUPAC (the International Union of Pure and Applied Chemistry) and IAHS (the International Association of Hydrological Sciences) to convene an international workshop, which was organized and hosted by the Institute of Soils and Water of the Agricultural Research Organization in Bet Dagan, Israel in March 1983. The lecturers at the workshop were an invited group of specialists who are engaged in studying the many facets of the unsaturated zone, and the present book is a selection of their presentations. Each chapter of the book relates to a different aspect of the unsaturated zone.
Download or read book Bacterial Adhesion written by Madilyn Fletcher and published by John Wiley & Sons. This book was released on 1996-09-21 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: BACTERIAL ADHESION Molecular and Ecological Diversity Edited byMadilyn Fletcher Over the last twenty years, research has revealed the enormouscomplexity underlying the phenomenon of bacterial adhesion. Theinitial research goal was to understand the mechanism of attachmentand its effects on the bacteria as well as the host. As researchprogressed, however, it became evident that many differentattachment mechanisms exist. These diverse forms of adhesion arethe results of numerous evolutionary pressures, and each may bepart of a larger behavioral strategy. This comprehensive overview details how diversity in habitat andecological requirements has led to enormous variety in adhesivecell components, underlying genetic determinants, and behavioralstrategies. It presents the latest research on adhesion mechanismsand strategies found in diverse environments and microorganisms,including the new environment of biomaterials. Bacterial Adhesion: Molecular and Ecological Diversity examinesadhesion as a strategy for nutrient access and as a phase in thecomplex behavior of life cycle processes. It covers the latestresearch and innovative approaches in the field, including: * Conceptual advances in research on the adhesion of bacteria tooral surfaces * Enhancing colonization in a fluctuating environment * The cellulosome: a cell-surface organelle for the adhesion to anddegradation of cellulose * Pseudomonas aeruginosa--versatile attachment mechanisms * Sensing, response, and adaptation to surfaces * Myxococcus coadhesion and role in the life cycle Edited by a leading authority on bacterial adhesion and featuringcontributions from the field's leading experts, this book speaks toresearchers in all areas of microbiology, biotechnology,environmental technology, and environmental science, as well asurology, immunology, and infectious diseases. Bacterial Adhesion: Molecular and Ecological Diversity is thelatest addition to the Wiley Series in Ecological and AppliedMicrobiology. Recent books in the series include: * Microbial Transformation and Degradation of Toxic OrganicChemicals edited by Lily Y. Young and Carl E. Cerniglia * Wastewater Microbiology by Gabriel Bitton * Environmental Microbiology edited by Ralph Mitchell * Biotechnology in Plant Disease Control edited by Ilan Chet * Antarctic Microbiology edited by E. Imre Friedmann * Effects of Acid Rain on Forest Processes edited by Douglas L.Godbold and Aloys Huttermann
Download or read book Movement and Longevity of Viruses in the Subsurface written by Ann Azadpour-Keeley and published by . This book was released on 2003 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microbial Ecological and Biogeochemical Processes in the Soil Vadose Zone Groundwater Habitats volume II written by Zifang Chi and published by Frontiers Media SA. This book was released on 2024-09-23 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given the success of Volume I of this Research Topic, and how rapidly the subject area is evolving, we are pleased to announce the launch of Microbial Ecological and Biogeochemical Processes in the Soil-Vadose Zone-Groundwater Habitats, Volume II. You can check Volume I here: https://www.frontiersin.org/research-topics/37506/microbial-ecological-and-biogeochemical-processes-in-the-soil-vadose-zone-groundwater-habitats Microorganisms regulate biogeochemical cycles and serve various functions within the soil, vadose zone, and groundwater habitats. Microbial communities are sensitive to environmental changes and can respond to them rapidly. The composition and function of these microorganisms in different habitats can be influenced by biotic and abiotic factors, which affect biochemical processes and ecosystem functions. Therefore, to develop a healthy-stable-sustainable ecosystem, this research topic focuses on microbial ecological and biogeochemical processes in the soil-vadose zone-groundwater habitat.
Download or read book Manual of Environmental Microbiology written by Christon J. Hurst and published by American Society for Microbiology Press. This book was released on 2007-05-14 with total page 3023 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most definitive manual of microbes in air, water, and soil and their impact on human health and welfare. • Incorporates a summary of the latest methodology used to study the activity and fate of microorganisms in various environments. • Synthesizes the latest information on the assessment of microbial presence and microbial activity in natural and artificial environments. • Features a section on biotransformation and biodegradation. • Serves as an indispensable reference for environmental microbiologists, microbial ecologists, and environmental engineers, as well as those interested in human diseases, water and wastewater treatment, and biotechnology.
Download or read book Methods of Soil Analysis Part 4 written by Jacob H. Dane and published by John Wiley & Sons. This book was released on 2020-05-27 with total page 1744 pages. Available in PDF, EPUB and Kindle. Book excerpt: The best single reference for both the theory and practice of soil physical measurements, Methods, Part 4 adopts a more hierarchical approach to allow readers to easily find their specific topic or measurement of interest. As such it is divided into eight main chapters on soil sampling and statistics, the solid, solution, and gas phases, soil heat, solute transport, multi-fluid flow, and erosion. More than 100 world experts contribute detailed sections.
Download or read book Introduction to Geomicrobiology written by Kurt O. Konhauser and published by John Wiley & Sons. This book was released on 2009-03-12 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Geomicrobiology is a timely and comprehensive overview of how microbial life has affected Earth’s environment through time. It shows how the ubiquity of microorganisms, their high chemical reactivity, and their metabolic diversity make them a significant factor controlling the chemical composition of our planet. The following topics are covered: how microorganisms are classified, the physical constraints governing their growth, molecular approaches to studying microbial diversity, and life in extreme environments bioenergetics, microbial metabolic capabilities, and major biogeochemical pathways chemical reactivity of the cell surface, metal sorption, and the microbial role in contaminant mobility and bioremediation/biorecovery microbiological mineral formation and fossilization the function of microorganisms in mineral dissolution and oxidation, and the industrial and environmental ramifications of these processes elemental cycling in biofilms, formation of microbialites, and sediment diagenesis the events that led to the emergence of life, evolution of metabolic processes, and the diversification of the biosphere. Artwork from the book is available to instructors at www.blackwellpublishing.com/konhauser.
Download or read book Applied and Industrial Mathematics in Italy II written by Vincenzo Cutello and published by World Scientific. This book was released on 2007 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial mathematics is evolving into an important branch of mathematics. Mathematicians, in particular in Italy, are becoming increasingly aware of this new trend and are engaged in bridging the gap between highly specialized mathematical research and the emerging demand for innovation from industry. The contributions in this volume provide both R&D workers in industry with a general view of existing skills, and academics with state-of-the-art applications of mathematics to real-world problems, which may also be incorporated in advanced courses.
Download or read book Soil Biochemistry written by Guenther Stotzky and published by CRC Press. This book was released on 1996-05-08 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides up-to-date reviews on the conditions that affect the quality of soil and on the methods to measure the effects of soil management and bioremediation--focusing on indigenous or introduced microorganisms with the capacity to remediate pollutants.
Download or read book Bacteria Transport Through Porous Material written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Applied And Industrial Mathematics In Italy Ii Selected Contributions From The 8th Simai Conference written by Vincenzo Cutello and published by World Scientific. This book was released on 2007-08-17 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial mathematics is evolving into an important branch of mathematics. Mathematicians, in particular in Italy, are becoming increasingly aware of this new trend and are engaged in bridging the gap between highly specialized mathematical research and the emerging demand for innovation from industry. The contributions in this volume provide both R&D workers in industry with a general view of existing skills, and academics with state-of-the-art applications of mathematics to real-world problems, which may also be incorporated in advanced courses.
Download or read book Nanoscience and Nanotechnology written by Vicki H. Grassian and published by John Wiley & Sons. This book was released on 2008-12-19 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book covers various aspects of nanoscience and nanotechnology and what is known about the potential environmental and health impacts. Divided into three main sections, the book addresses the toxicity of nanomaterials, fate and transport of nanomaterials in the environment, and occupational health aspects of nanotechonology.
