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Book A Rotating Disk Study of the Mechanisms of Calcite Dissolution in the Presence of Environmentally Benign Polyaspartic Acid

Download or read book A Rotating Disk Study of the Mechanisms of Calcite Dissolution in the Presence of Environmentally Benign Polyaspartic Acid written by Kathie Lee Burns and published by . This book was released on 2002 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keywords: polyelectrolytes, environmentally friendly, scale inhibition, scale dissolution, calcium carbonate dissolution, dissolution kinetics.

Book Proceedings of the 2002 National Conference on Environmental Science and Technology

Download or read book Proceedings of the 2002 National Conference on Environmental Science and Technology written by Godfrey A. Uzochukwu and published by . This book was released on 2003 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2002 National Conference on Environmental Science and Technology, Greensboro. NC. September 8-10, 2002, addressed pollution prevention needs, solutions, and research and promoted the partnerships needed to protect the environment and improve quality of life. These proceedings contain 34 papers organized into the following sections: - Bioprocessing - Bioremediation - Environmental Justice - Fate and Transport - Innovative Environmental Technologies - Pollution Prevention Separation Processes - Risk and Economics.

Book A Rotating Disk Study on the Rates of Calcite Dissolution at 25 C

Download or read book A Rotating Disk Study on the Rates of Calcite Dissolution at 25 C written by Eric Charles Schuttringer and published by . This book was released on 1984 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Directory of Graduate Research

Download or read book Directory of Graduate Research written by American Chemical Society. Committee on Professional Training and published by . This book was released on 2005 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.

Book A Rotating Disk Study on the Rates of Calcite Dissolution at 25 Degrees Centigrade

Download or read book A Rotating Disk Study on the Rates of Calcite Dissolution at 25 Degrees Centigrade written by Eric Charles Schuttringer and published by . This book was released on 1984 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Calcite Dissolution Kinetics at the Sediment water Interface in an Acidifying Ocean

Download or read book Calcite Dissolution Kinetics at the Sediment water Interface in an Acidifying Ocean written by Olivier Sulpis and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Carbon dioxide (CO2), produced and released to the atmosphere by human activities, has been accumulating in the oceans for approximately two centuries and will continue to do so well beyond the end of this century if emissions are not curbed. One direct consequence of CO2 build-up in the atmosphere and its transfer to the ocean is the acidification of seawater. Calcite, a mineral secreted by many organisms living in the surface ocean to produce their shells and skeletons, covers a large part of the seafloor and acts as a natural anti-acid, neutralizing CO2. Thus, a precise knowledge of the kinetics of this dissolution reaction is necessary to predict the ocean recovery time towards its pre-acidification state once anthropogenic CO2 emissions are curbed. This thesis combines laboratory experiments, oceanographic measurements and model outputs to explore and unravel the mechanisms that control calcite dissolution at the sediment-water interface (SWI) on the seafloor in the context of current anthropogenic ocean acidification. Using a newly developed temperature-controlled rotating-disk reactor, as well as a stirred reactor, we were able to measure the rate of dissolution of simulated and natural sediment disks of variable calcite content under environmental and hydrodynamic conditions representative of deep-sea benthic environments. These experiments revealed that, in contrast to the reigning paradigm that calcite dissolution kinetics in seawater is surface reaction-controlled and of high order, calcite dissolution at the SWI and under deep-sea conditions is linearly dependent on the undersaturation state of the overlying seawater with respect to calcite and controlled by the presence of a diffusive-boundary layer (DBL) above the sediment bed. Therefore, irrespective of the mineralogy and sediment properties, the dissolution rate is simply a function of the saturation state of the overlying seawater with respect to calcite, the calcite content of the sediment, and hydrodynamics at the seafloor. From these observations, using a compilation of seawater chemical variables in the global ocean, corresponding sediment calcite content and rain rates, as well as recently modeled bottom current velocities, we have been able to identify the loci of current anthropogenic calcite dissolution and its rate. We found that significant anthropogenic dissolution of calcite at the seafloor currently occurs in the western North Atlantic, where the bottom waters are youngest, and at various hot spots in the southern Atlantic, Indian and Pacific Oceans. Using model projections for the 21st century, under a “business as usual” scenario, we found that while seawater will become more corrosive to this mineral, calcite dissolution at the seafloor will decrease in intensity because bottom currents will slow down and the amount of calcite particles delivered to the seafloor will diminish. These results indicate that the neutralization of human-made CO2 by calcite dissolution at the seafloor may take longer than previously thought. These findings are of critical interest to the scientific community and the public, as these results have far reaching implications for ocean acidification mitigation, to the fate of benthic communities living under increasing environmental stress, and to geologists contemplating both present and past records of ocean acidification"--

Book Modelling Calcite Dissolution in a Rotating Disc Reaction Vessel

Download or read book Modelling Calcite Dissolution in a Rotating Disc Reaction Vessel written by Camelia Yazdani and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The carbonate system is ubiquitous in nature, playing a role in many natural and industrial processes. For calcite dissolution, the kinetics and mass transport of the dissolved species reflect both the chemistry of the bulk, and the conditions at the dissolving interface. We formulate the dissolution problem as a set of coupled convection- reaction-diffusion equations that is not only consistent with the bulk chemistry, but is also connected with a Stefan condition for dissolution interface, treating it as a free boundary. The substantial difference in the order of magnitude of the various reaction rates decouples the system. The relatively slow speed of the moving interface allows for a quasi-steady solution. The model reproduces the experimentally observed behaviour without the need to introduce additional reactions occurring at the reacting surface.

Book Public Roads of Tennessee

Download or read book Public Roads of Tennessee written by and published by . This book was released on 1906 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Mineral Scale Formation and Inhibition

Download or read book Mineral Scale Formation and Inhibition written by Z. Amjad and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book documents the proceedings of the symposium, "Mineral Scale Formation and Inhibition," held at the American Chemical Society Annual Meeting August 21 to 26, 1994, in Washington, D. C. The symposium, sponsored by the Division of Colloid and Surface Chemistry, was held in honor of Professor George H. Nancollas for his pioneering work in the field of crystal growth from solution. A total of 30 papers were presented by a wide spectrum of scientists. This book also includes papers that were not presented but were in the symposium program. The separation of a solid by crystallization is one of the oldest and perhaps the most frequently used operations in chemistry. Because of its widespread applicability, in recent years there has been considerable interest exhibited by academic and industrial scientists in understanding the mechanisms of crystallization of sparingly soluble salts. The salt systems of great interest in industrial water treatment area (i. e. , cooling and boiler) include carbon ates, sulfates, phosphates, and phosphonates of alkaline earth metals. Although not as common as calcium carbonate and calcium sulfate, barium and strontium sulfates have long plagued oil field and gas production operations. The build-up of these sparingly soluble salts on equipment surfaces results in lower heat transfer efficiency, increased corrosion rates, increased pumping costs, etc. In the laundry application, insoluble calcium carbonate tends to accumulate on washed fabrics and washing equipment parts, resulting in undesirable fabric-encrustation or scaling.

Book The Science and Technology of Industrial Water Treatment

Download or read book The Science and Technology of Industrial Water Treatment written by Zahid Amjad and published by CRC Press. This book was released on 2010-04-05 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mineral scale deposits, corrosion, suspended matter, and microbiological growth are factors that must be controlled in industrial water systems. Research on understanding the mechanisms of these problems has attracted considerable attention in the past three decades as has progress concerning water treatment additives to ameliorate these concerns.

Book Polyelectrolytes and Nanoparticles

Download or read book Polyelectrolytes and Nanoparticles written by Joachim Koetz and published by Springer Science & Business Media. This book was released on 2007-02-20 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This lab manual guides chemists through demonstrations of synergistic effects between polyelectrolytes and nanoparticles. After a short introduction into the field of polyelectrolytes and polyelectrolyte characterization, the book discusses the role of polyelectrolytes in the process of nanoparticle formation. The book also explains methods for characterization of the polyelectrolyte-modified nanoparticles.

Book Production Chemicals for the Oil and Gas Industry

Download or read book Production Chemicals for the Oil and Gas Industry written by Malcolm A. Kelland and published by CRC Press. This book was released on 2014-03-13 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text discusses a wide variety of production chemicals used by the oil and gas industry for down-hole and topside applications both onshore and offshore. It reviews all past and present classes of production chemicals, providing numerous difficult-to-obtain references. Unlike other texts that focus on how products perform in the field, this book focuses on the specific structures of chemicals that are known to deliver the required or desired performance. Where known, it also details the environmental aspects of the chemicals discussed and their success in the field.