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Evaluation Of Novel Polyethersulfone Membranes Incorporating Charged Surface Modifying Macromolecules For The Removal Of Pharmaceuticals And Endocrine Disrupting Compounds From Drinking Water
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Book Synopsis Evaluation of Novel Polyethersulfone Membranes Incorporating Charged Surface Modifying Macromolecules for the Removal of Pharmaceuticals and Endocrine Disrupting Compounds from Drinking Water by : Amy Westgate
Download or read book Evaluation of Novel Polyethersulfone Membranes Incorporating Charged Surface Modifying Macromolecules for the Removal of Pharmaceuticals and Endocrine Disrupting Compounds from Drinking Water written by Amy Westgate and published by . This book was released on 2008 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Novel Polyethersulfone Membranes Developed Using Charged Surface Modifying Macromolecules for the Removal of Pharmaceutically Active Compounds and Endocrine Disrupting Compounds from Drinking Water by : Anne-Marie Garand-Sheridan
Download or read book Evaluation of Novel Polyethersulfone Membranes Developed Using Charged Surface Modifying Macromolecules for the Removal of Pharmaceutically Active Compounds and Endocrine Disrupting Compounds from Drinking Water written by Anne-Marie Garand-Sheridan and published by . This book was released on 2008 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Modifying Macromolecules (SMM) - Incorporated Ultrafiltration Membranes for Natural Organic Matter (NOM) Removal by : Thanh Huyen Dang
Download or read book Surface Modifying Macromolecules (SMM) - Incorporated Ultrafiltration Membranes for Natural Organic Matter (NOM) Removal written by Thanh Huyen Dang and published by . This book was released on 2009 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surface Modifying Macromolecules for Enhancement of Polyethersulfone Pervaporation Membrane Performance by : Vu Anh Pham
Download or read book Surface Modifying Macromolecules for Enhancement of Polyethersulfone Pervaporation Membrane Performance written by Vu Anh Pham and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this work was to modify the surface of polyethersulfone membranes in order to render them more useful in pervaporation for the removal of volatile organic compounds (VOC) from aqueous solutions. Surface Modifying Macromolecules (SMNs) were designed and developed as surface modifiers of asymmetric polyethersulfone (PES) membranes. Eight SMM polymers were synthesized in triplicate using methylene bis-p-phenyl diisocyanate (MDI), polypropylene oxide (PPO) and polyfluoroalcohol (BA-L). They represented a 2$\sp3$ factorial design used to study the effects of reactant stoichiometry, prepolymer reactant concentration and chain length of the polyfluoroalcohol on the SMM properties and reproducibility of the SMM synthesis. The bulk SMM polymers were characterized with differential scanning calorimetry (DSC), gel permeation chromatography (GPC) and elemental analysis. The compatibility between PES and SMM polymers was studied by DSC. The average molecular weight of SMM polymers, determined by GPC, were in the range of $1.0\times10\sp4\rm\ to\ 3.5\times10\sp4$. As predicted by theoretical considerations, SMMs were found to have migrated to the PES surface, rendering it more hydrophobic. This migration effect was confirmed by water droplet contact angle measurements and X-ray photoelectric spectroscopy (XPS). Opaqueness of PES/SMM films and results of DSC showed that SMM was either immiscible or partially miscible with PES. Preliminary pervaporation studies indicated that the addition of SMMs improved the selectivity of PES membranes, used in the separation of chloroform/water mixtures by 150 to 240%, depending on the chemical formulation of the SMM. In several cases, SMMs also improved the permeation rate. From a preliminary assessment of the changes in membrane surface and bulk characteristics, the surface chemistry and energetics were observed to contribute an important role in inducing the membranes' enhanced properties. (Abstract shortened by UMI.).
Book Synopsis Membrane Fouling Reduction by the Incorporation of Hydrophilic Surface Modifying Macromolecules in Ultrafiltration Membrane Manufacturing by : Hai Anh Nguyen
Download or read book Membrane Fouling Reduction by the Incorporation of Hydrophilic Surface Modifying Macromolecules in Ultrafiltration Membrane Manufacturing written by Hai Anh Nguyen and published by . This book was released on 2005 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Surface Modifying Macromolecule Blended Polyethersulfone Membranes for Vaccum Membrane Distillation by : Daniel Eumine Suk
Download or read book Development of Surface Modifying Macromolecule Blended Polyethersulfone Membranes for Vaccum Membrane Distillation written by Daniel Eumine Suk and published by . This book was released on 2006 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of Manufacturing Conditions of Polyethersulfone Membranes on Final Characteristics and Fouling Reduction by : Daniella Berenisse Mosqueda-Jimenez
Download or read book Impact of Manufacturing Conditions of Polyethersulfone Membranes on Final Characteristics and Fouling Reduction written by Daniella Berenisse Mosqueda-Jimenez and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of membrane processes in drinking water treatment has increased exponentially in the last few years. However, one of the shortcomings that hinders their wider application is the propensity of membranes to become fouled, causing the permeate flux to decrease with time. One of the main membrane foulants is the natural organic matter (NOM) present in water sources. Membrane characteristics and performance are affected by membrane preparation conditions. The objective of this thesis was to investigate the impact of hydrophobic surface modifying macromolecule (SMM) addition and other manufacturing conditions on the membrane characteristics and performance of polyethersulfone (PES) membranes. As it was necessary to test numerous membrane coupons prepared under many different conditions, during the first stage of this study a membrane test protocol was established. Small test cells gave very similar results to those produced by a larger test cell, which is recommended by USEPA for membrane testing. The test protocol was relatively short in duration and required a small amount of test solution. Moreover, as membrane compaction rate depends on the material, it was important to incorporate a precompaction step into the test protocol in order to quantify the contribution of membrane compaction when fouling was studied. The second stage of the study evaluated the impact of different membrane preparation conditions (i.e., solvent evaporation time and PES concentration) and the impact of three different SMM formulations. The three SMMs differed only in the polyol used in their synthesis. SMM41, the most miscible SMM, proved to be the most promising SMM. In general, the increase of PES concentration and/or evaporation time, together with the surface modification, produced tighter membranes with improved TOC removals, decreased NOM deposition on top of the membranes and decreased flux reduction, but also resulted in a reduced permeation rate. The best SMM41-modified membranes performed as well as their unmodified counterparts in terms of pure water permeation rate, TOC removal, and final flux. SMM41 modification significantly reduced the amount of NOM deposited on the membrane surface, and in general reduced the percentage of flux reduction. Thus, the effect of surface modification on the membrane performance was positive but marginal. Membranes prepared with PVP had higher porosities and consequently, larger permeation rates than the membranes prepared without PVP, and similar TOC removals. In this case the effect of the SMM41-modification was statistically insignificant. When different fractions of NOM were used as feed solutions a significant effect was observed for all the response variables. Low-molecular-weight NOM, as that present in most groundwaters and coagulated surface waters, caused less fouling, having a higher permeate flux at the end of the experiment; however, smaller TOC removals were observed. In general, there is a compromise between the TOC removal that the membrane can achieve and the permeation rate. Higher TOC removal is achieved by membranes with smaller permeation rate.
Book Synopsis Development of Surface Modifying Macromolecule Blended Polyethersulfone Membranes for Vaccum Membrane Distillation by : Daniel Eumine Suk
Download or read book Development of Surface Modifying Macromolecule Blended Polyethersulfone Membranes for Vaccum Membrane Distillation written by Daniel Eumine Suk and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Novel Surface Modifications and Materials for Fouling Resistant Water Purification Membranes by : Bryan David McCloskey
Download or read book Novel Surface Modifications and Materials for Fouling Resistant Water Purification Membranes written by Bryan David McCloskey and published by . This book was released on 2009 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major challenge facing widespread implementation of membrane-based water purification is fouling, which results in increased operating costs and reduced membrane lifetime. This thesis focuses on various methods, including novel membrane surface modifications and polymers that resist degradation when exposed to oxidizing agents used as disinfectants, to alleviate membrane fouling. Fouling-resistant ultrafiltration membrane coatings were prepared from poly(ethylene glycol) diglycidyl ether-crosslinked chitosan (chi-PEG hybrid). Composite membranes were prepared for oil-water emulsion filtration by coating the most promising chi-PEG hybrid onto a polysulfone ultrafiltration membrane. Optimization of the coating layer thickness led to composite membranes that exhibited water flux values more than 5 times higher than that of uncoated membranes after one day of oily-water crossflow filtration. The organic rejection of the coated membranes was also higher than that of the uncoated polysulfone membranes. Polydopamine (PDOPA) deposition was discovered to reduce fouling in water purification membranes. PDOPA was found to deposit from solution onto virtually any surface. When deposited on water purification membranes, PDOPA rendered the membrane more hydrophilic and less susceptible to fouling. Moreover, covalent binding of other molecules, such as amine-terminated poly (ethylene glycol) (PEG), to PDOPA is simple and performed using benign chemicals and conditions. Commercially-available polymeric membranes were modified with polydopamine, and all showed improved fouling resistance while filtering oil-water emulsions. To demonstrate the versatility and ease of PDOPA modification scalability, PDOPA was deposited on entire membrane modules, and the resulting modified module exhibited improved fouling resistance. Finally, high ion rejection, chlorine-tolerant sulfonated polysulfone thin-film composite membranes were prepared and characterized. Interestingly, freestanding thick sulfonated poly(arylene ether sulfone) (BPS) films exhibit nearly neutral electrostatic charge, even though sulfonation introduces fixed negative charge into the polymer structure. As a result, charge exclusion ion partitioning is not a dominant rejection mechanism in these films. However, composite membranes prepared from a BPS coating layer and a porous Udel polysulfone support exhibit a negatively charged surface and, presumably, charge exclusion would be a more important partitioning mechanism for these membranes. Therefore, thick BPS films do not exhibit certain drawbacks, such as reduced salt rejection of mixed-valence feeds, that are observed in BPS thin-film composite membranes.
Book Synopsis Evaluation of Biosorbents for the Removal of Pharmaceuticals and Endocrine Disrupting Compounds from Aqueous Media by : Yuan Li
Download or read book Evaluation of Biosorbents for the Removal of Pharmaceuticals and Endocrine Disrupting Compounds from Aqueous Media written by Yuan Li and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Surface-modifying Macromolecules on the Blood Compatibility of Polyethersulfone Membranes Intended for Biomedical Applications by :
Download or read book The Effects of Surface-modifying Macromolecules on the Blood Compatibility of Polyethersulfone Membranes Intended for Biomedical Applications written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preparation of Thin-film-composite Polyamide Membranes for Desalination Using Novel Hydrophilic Surface Modifying Macromolecules by : Belal Abu Tarboush
Download or read book Preparation of Thin-film-composite Polyamide Membranes for Desalination Using Novel Hydrophilic Surface Modifying Macromolecules written by Belal Abu Tarboush and published by . This book was released on 2008 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biosorption for Wastewater Contaminants by : Rangabhashiyam Selvasembian
Download or read book Biosorption for Wastewater Contaminants written by Rangabhashiyam Selvasembian and published by John Wiley & Sons. This book was released on 2021-10-25 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pollution due to various anthropogenic activities continues to increase. In terms of water pollutants, organic and inorganic pollutants are the most problematic. Although several measures have been proposed and implemented to prevent or reduce contamination, their increased concentration in water bodies has created serious concerns. Over the years, the problem has been aggravated by industrialization, urbanization and the exploitation of natural resources. The direct discharge of wastewater contaminants and their geographical mobilization have caused an increase in concentration in ground, surface, fluvial and residual waters. Extensive information about detection and disposal methods is needed in order to develop technological solutions for a variety of environments, both urban and rural. This book provides up-to-date information on wastewater contaminants, aimed at researchers, engineers and technologists working in this field. Conventional physicochemical techniques used to remove contaminants from wastewater include ion exchange, precipitation, degradation, coagulation, coating, membrane processes and adsorption. However, these applications have technological and economic limitations, and involve the release of large amounts of chemical reagents and by-products that are themselves difficult to remove. Biosorption - the use of organically generated material as an adsorbent – is attracting new research and scholarship. Thermally-treated calcined biomaterials may be treated to remove heavy metals from wastewater. To ensure the elimination of these contaminants, existing solutions must be integrated with intelligent biosorption functions. Biosorption for Wastewater Contaminants will find an appreciative audience among academics and postgraduates working in the fields of environmental biotechnology, environmental engineering, wastewater treatment technology and environmental chemistry.
Download or read book The MBR Book written by Simon Judd and published by Elsevier. This book was released on 2011-04-18 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: The MBR Book
Book Synopsis Treatment of Micropollutants in Water and Wastewater by : Jurate Virkutyte
Download or read book Treatment of Micropollutants in Water and Wastewater written by Jurate Virkutyte and published by IWA Publishing. This book was released on 2010-08-14 with total page 505 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last few years there has been a growing concern over the increasing concentration of micropollutants originating from a great variety of sources including pharmaceutical, chemical engineering and personal care product industries in rivers, lakes, soil and groundwater. As most of the micropollutants are polar and persistent compounds, they are only partially or not at all removed from wastewater and thus can enter the environment posing a great risk to the biota. It is hypothesized that wastewater is one of the most important point sources for micropollutants. Treatment of Micropollutants in Water and Wastewater gives a comprehensive overview of modern analytical methods and will summarize novel single and hybrid methods to remove continuously emerging contaminants - micropollutants from the aqueous phase. New trends (e.g. sensor technology, nanotechnology and hybrid treatment technologies) are described in detail. The book is very timely because the new techniques are still in the development phase and have to be realized not only in the laboratory but also on a larger scale. The content of the book is divided into chapters that present current descriptive and analytical methods that are available to detect and measure micropollutants together with detailed information on various chemical, biological and physicochemical methods that have evolved over the last few decades. Treatment of Micropollutants in Water and Wastewater will also enable readers to make well informed choices through providing an understanding of why and how micropollutants must be removed from water sources, and what are the most appropriate and available techniques for providing a cost and technologically effective and sustainable solutions for reaching the goal of micropollutant-free water and wastewater. The book will be suitable for water and wastewater professionals as well for students and researchers in civil engineering, environmental engineering and process engineering fields.
Download or read book Cyclodextrin written by Poonam Arora and published by BoD – Books on Demand. This book was released on 2018-04-18 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is devoted to the highly versatile and potential ingredient Cyclodextrin, a family of cyclic oligosaccharides composed of ?-(1,4)-linked glucopyranose subunits. Its molecular complexation phenomena and negligible cytotoxic effects attribute toward its application such as in pharmaceuticals, cosmetics, food, agriculture, textile, separation process, analytical methods, catalysis, environment protection, and diagnostics. Efforts have also been made to concentrate on recent research outcomes along with future prospects of cyclodextrins to attract the interest of scientists from the industry and academia. The contributions of the authors are greatly acknowledged, without which this compilation would not have been possible.
Book Synopsis Membrane Biological Reactors by : Faisal I. Hai
Download or read book Membrane Biological Reactors written by Faisal I. Hai and published by IWA Publishing. This book was released on 2013-11-01 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years the MBR market has experienced unprecedented growth. The best practice in the field is constantly changing and unique quality requirements and management issues are regularly emerging. Membrane Biological Reactors: Theory, Modeling, Design, Management and Applications to Wastewater Reuse comprehensively covers the salient features and emerging issues associated with the MBR technology. The book provides thorough coverage starting from biological aspects and fundamentals of membranes, via modeling and design concepts, to practitioners’ perspective and good application examples. Membrane Biological Reactors focuses on all the relevant emerging issues raised by including the latest research from renowned experts in the field. It is a valuable reference to the academic and professional community and suitable for undergraduate and postgraduate teaching in Environmental Engineering, Chemical Engineering and Biotechnology. Editors: Faisal I. Hai, University of Wollongong, Australia Kazuo Yamamoto, University of Tokyo, Japan Chung-Hak Lee, Seoul National University, Korea.
