The Scientific Basis of Flocculation


Author: K.J. Ives
Publisher: Springer Science & Business Media
ISBN: 9400999380
Category: Science
Page: 369
View: 2771

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K.J. Ives Professor of Public Health Engineering University College London The aggregation of small particles in liquids, to form flocs which are large enough to settle, or to be filtered, is a common operation in industrial processes, and water and wastewater treatment. This aggregation, given the general title flliocculation in this book, may be brought about by the addition of chemicals to reduce the stability of the original suspension, by neutralising electrical forces of repulsion, by the addition of chemicals (polymers) to link particles by bridging action, by the addition of chemicals which form particles to increase collision proba bilities, and by the input of energy leading to hydrodynamically induced collisions. The particles undergoing flocculation may range from colloidal in the nanometer size range, through micro scopic (micron) size, up to visible particles in the millimeter size range; that is a total size range of six orders of magnitude. Consequently the colloid chemist and the hydrodynamicist are both concerned with the interactions that take place, and to them the engineer must turn, to obtain the fundamental information ne cessary for the process design and its associated hardware.

The Scientific Basis of Flocculation


Author: K.J. Ives
Publisher: Springer Science & Business Media
ISBN: 9789028607583
Category: Science
Page: 369
View: 1392

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K.J. Ives Professor of Public Health Engineering University College London The aggregation of small particles in liquids, to form flocs which are large enough to settle, or to be filtered, is a common operation in industrial processes, and water and wastewater treatment. This aggregation, given the general title flliocculation in this book, may be brought about by the addition of chemicals to reduce the stability of the original suspension, by neutralising electrical forces of repulsion, by the addition of chemicals (polymers) to link particles by bridging action, by the addition of chemicals which form particles to increase collision proba bilities, and by the input of energy leading to hydrodynamically induced collisions. The particles undergoing flocculation may range from colloidal in the nanometer size range, through micro scopic (micron) size, up to visible particles in the millimeter size range; that is a total size range of six orders of magnitude. Consequently the colloid chemist and the hydrodynamicist are both concerned with the interactions that take place, and to them the engineer must turn, to obtain the fundamental information ne cessary for the process design and its associated hardware.

Encyclopedia of Chemical Processing and Design

Volume 41 - Polymers: Rubber Modified to Pressure-Relieving Devices: Rupture Disks: Low Burst Pressures
Author: John J. McKetta Jr
Publisher: CRC Press
ISBN: 9780824724917
Category: Science
Page: 536
View: 2815

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"Written by engineers for engineers (with over 150 International Editorial Advisory Board members),this highly lauded resource provides up-to-the-minute information on the chemical processes, methods, practices, products, and standards in the chemical, and related, industries. "

Unit Operations Handbook

Volume 2 (In Two Volumes)
Author: John J. McKetta Jr
Publisher: CRC Press
ISBN: 9780824786700
Category: Science
Page: 742
View: 3007

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Emphasizes the design, control, and functioning of various unit operations - offering shortcut methods of calculation along with computer and nomographic solution techniques. Provides practical sections on conversion to and from SI units and cost indexes for quick updating of all cost information.;This book should be of interest to mechanical, chemical, process design, project, and materials engineers and continuing-education courses in these disciplines.

Mathematical Models and Design Methods in Solid-Liquid Separation


Author: A. Rushton
Publisher: Springer Science & Business Media
ISBN: 9400950918
Category: Science
Page: 399
View: 1617

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The separation of finely-divided solids from liquids constitutes an important stage in many industrial processes. Separation of mixtures ranging from highly concentrated slurries to slightly turbid liquids must be effected in circumstances where the solids, liquid or both phases may have value. Separations may be achieved by use of a membrane or filter medium which, positioned in the path of a flowing suspension, will allow passage of the fluid whilst retaining solids on the surface or within the medium. Alternatively the two phases may be separated by sedimentation processes involving gravitational or centrifugal force. In either mode, separation difficulties are sometimes experienced with the result that solid-liquid separation is often a bottleneck in commercial plants. Operational difficulties and plant failures are associated with the random nature of the particles being separated; variations in size, shape, states of aggregation, compressibility, etc. , produce a wide range of problems. Plugging of the filter medium or the collapse of the solids under applied stress lead to slow flowrates of liquid. The colloidal nature of some precipitates makes separation by settling virtually impossible without the use of chemical agents to enhance the size of basic units and to reduce repulsive surface forces. Unit operations such as filtration, comminution, etc. , involve a seemingly bewildering array of machines which makes plant selection a difficult step and reflects the uncer tainties attaching to operations involving the solid )hase. Many types of pressure, vacuum and centrifugal filter are available.

The Scientific Basis of Flotation


Author: K.J. Ives
Publisher: Springer Science & Business Media
ISBN: 9400969260
Category: Science
Page: 429
View: 2394

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K.J.Ives Professor of Public Health Engineering University College London Industrial application of the use of bubbles to float fine particles in water began before the beginning of this century, in the field of mineral processing. Such bubble flotation was applied very little outside mineral processing, until about 1960 when the dissolved air process, which has already had some success in the pulp and paper industry, was applied to water and wastewater treatment. The subsequent two decades saw not only a growth development for water and wastewater treatment, but also a growing cognisance of the similarities that existed with mineral processing flotation. Therefore the time seemed ripe in 1982 for a joint meeting between experts in these two major fields of flotation to put together the Scientific Basis of Flotation in the form of a NATO Advanced Study Institute. Attended by about 60 specialists, mainly post doctoral, from 17 countries, this Study Institute in residence for two weeks in Christ's College, Cambridge (UK) heard presentations from several international experts, principally the 8 co-authors of this book. The integration of the various scientific disciplines of physics, physical chemistry, colloid science, hydrodynamics and process engineering showed where the common basiS, and occasional important differences, of flotation could be applied to mineral processing, water and wastewater treatment, and indeed some other process industries (for example: pharmaceuticals, and food manufacture).

Engineering Geology


Author: Wang Sijing,Paul G. Marinos
Publisher: VSP
ISBN: 9789067642408
Category: Technology & Engineering
Page: 531
View: 4399

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Bibliographic Guide to Conference Publications


Author: N.A
Publisher: N.A
ISBN: 9780816168668
Category: Congresses and conventions
Page: N.A
View: 5082

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Vols. for 1975- include publications cataloged by the Research Libraries of the New York Public Library with additional entries from the Library of Congress MARC tapes.

Aqua


Author: N.A
Publisher: N.A
ISBN: N.A
Category: Water-supply
Page: N.A
View: 6372

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Genesis and Properties of Collapsible Soils


Author: Tom Dijkstra,Ian J. Smalley
Publisher: Springer Science & Business Media
ISBN: 9401100977
Category: Science
Page: 413
View: 7757

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Collapsing engineering soils are a formidable hazard around the world. These difficult materials also include some of the world's most fertile agricultural soils, fostering dense human populations which are therefore increasingly at risk. Despite an impressive literature on the engineering aspects of collapsing soils, these materials are coming under increasing scrutiny by scientists in other fields. This is most evidently the case with soil scientists, stratigraphers and sedimentologists. Past earth surface conditions have a direct influence on the detailed behaviour of collapsible soils: as a complement, these materials also provide detailed data on changing global climates. The selected papers presented here highlight the common ground between three scientific groups with a vested interest in a better understanding of collapsible soils.

1st Research Forum on Recycling

The Westin Harbour Castle Hotel, Toronto, Ontario, October 29-31, 1991
Author: Marcel Lapointe,Canadian Pulp and Paper Association. Technical Section
Publisher: Montréal : Technical Section, Canadian Pulp and Paper Association = Section technique, Association canadienne des pâtes et papiers
ISBN: N.A
Category: Recycling (Waste, etc.)
Page: 223
View: 8824

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Technical Section Proceedings


Author: Canadian Pulp and Paper Association. Technical Section
Publisher: N.A
ISBN: N.A
Category: Papermaking
Page: N.A
View: 9821

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Annual meeting held after the end of the calendar year covered by the proceedings.

Estuarine comparisons

proceedings of the Sixth Biennial International Estuarine Research Conference, Gleneden Beach, Oregon, November 1-6, 1981
Author: Estuarine Research Federation,U.S. Fish and Wildlife Service
Publisher: Academic Pr
ISBN: 9780124040700
Category: Nature
Page: 709
View: 7470

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