Download or read book Understanding Production and Regeneration Of Hybrid Fiber Ferric Hydroxide Adsorbents For Arsenic Removal From Drinking Water written by Binod Chaudhary and published by . This book was released on 2014 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drinking water contaminated with arsenic is a worldwide problem, especially in developing nations. The research presented in this dissertation describes two major goals: development of hybrid homopolymer polyacrylonitrile (PAN)-based sorbents for arsenate removal from drinking water and understanding regeneration of arsenate from ferric hydroxide-based adsorbents. The homopolymer PAN fiber was chemically modified to introduce functional groups using NaOH and hydrazine hydrate (HH) separately, or in combination of both. The modified fibers were characterized using Fourier transform infrared spectroscopy (FTIR) and ion exchange measurements. The ferric hydroxides were impregnated onto functionalized fibers using two iron loading procedures. The best arsenate removal performance was obtained using the simplest pretreatment procedure of soaking in 10% NaOH at 95 °C for ninety min, followed by precipitation coating of ferric hydroxide. This suggests that adsorbents based on a low-cost PAN fabric may be produced in developing areas of the world where commercial products may not be available. A density functional theory (DFT) molecular modeling was used to compare free energies of reactions and activation barriers in the formation of arsenate-ferric hydroxide complexes. Slow kinetics associated with arsenate adsorption and desorption attributed to the high activation barriers in forming and breaking bonds with the ferric hydroxides. Another aspect of regeneration study focused on the effects of underlying properties of the ferric hydroxides-loaded adsorbents on arsenate recovery. The arsenate loaded ferric hydroxide adsorbent containing no or weak base functionalities can be regenerated using NaOH, while addition of NaCl to NaOH solution is required for same recovery of arsenate from the adsorbents containing strong base anion exchange functionalities. Moreover, the irreversible fraction of arsenate on the adsorbent can be reduced by increasing the concentration of NaOH. Thus, understanding arsenate desorption kinetics and effects of support properties of ferric hydroxide-based adsorbents are important for environmental fate of arsenate and in designing adsorption systems for removing arsenate from potable water.
Download or read book Adsorbent Treatment Technologies for Arsenic Removal written by Gary L. Amy and published by American Water Works Association. This book was released on 2005 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM includes Excel document "Arsenic adsorbent design and costing tool".
Download or read book Innovative Materials and Methods for Water Treatment written by Marek Bryjak and published by CRC Press. This book was released on 2016-02-17 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to increasing demand for potable and irrigation water, water suppliers have to use alternative resources. They either have to regenerate wastewater or deal with contaminated surface water. This book brings together the experiences of various experts in preparing of innovative materials that are selective for arsenic and chromium removal, and in
Download or read book Technologies for Arsenic Removal from Drinking Water written by M. Feroze Ahmed and published by . This book was released on 2001 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes some papers with reference to Bangladesh and India.
Download or read book Adsorptive Iron Removal from Groundwater written by Sharoz Kumar Sharma and published by CRC Press. This book was released on 2021-05-30 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pilot study conducted at the Gilze water treatment plant of Water Supply North West Brabant demonstrated that adsorptive filtration has several potential advantages over floc filtration, namely: longer filter runs due to slower head loss development; better filtrate quality; shorter ripening time; and less backwash water use. In existing groundwater treatment plants, the high iron (II) adsorption capacity of the iron oxide coated filter media makes it potentially possible to switch the governing mode of operation from floc filtration to adsorptive filtration. To achieve this two options can be considered: iron (II) adsorption under anoxic conditions followed by oxidation with oxygen-rich water; and adsorption of iron (II) in the presence of oxygen and simultaneous oxidation. The first option might be attractive specifically when two filtration steps are available.
Download or read book Arsenic Removal for Drinking Water in Developing Countries Through the Use of Granular Ferric Hydroxide Media written by and published by . This book was released on 2007 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Demonstration of Emerging Technologies for Arsenic Removal Bench scale testing written by Yu-Jung Chang and published by American Water Works Association. This book was released on 2004 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project addresses those technologies deemed most appropriate for small water systems to comply with the Jan '06 USEPA Arsenic Rule Maximum Contaminant Level (MCL). This volume reports on the bench-scale testing of of 4 technologies: ion-exchange processes, sorption kinetics, coupled sorbent-membrane processes and coupled coagulation-ballasted-sedimentation processes. Volume 2 will focus on results of the full-scale demonstration testing.
Download or read book The Removal of Arsenic from Drinking Water by Carbon Adsorption written by Masanori Fujimoto and published by . This book was released on 2001 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book New Applications of Fine grained Iron Oxyhydroxides as Cost effective Arsenic Adsorbents in Water Treatment written by Muhammad Usman and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arsenic Remediation in Drinking Waters Using Ferrate and Ferrous Ions written by Christopher Martin Vogels and published by . This book was released on 1998 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Green Adsorbents to Remove Metals Dyes and Boron from Polluted Water written by Inamuddin and published by Springer Nature. This book was released on 2020-08-31 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews adsorption techniques to clean wastewater, with focus on pollution by dyes and heavy metals. Advanced adsorbents include carbon nanomaterials, biomass, cellulose, polymers, clay, composites and chelating materials.
Download or read book Adsorptive Removal of Heavy Metals from Groundwater by Iron Oxide Based Adsorbents written by Valentine Uwamariya and published by CRC Press. This book was released on 2014-03-19 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In general, groundwater is a preferred source of drinking water because of its convenient availability and its constant and good quality. However this source is vulnerable to contamination by several substances. Acceptable quality limits relative to micropollutant contents in drinking water are becoming increasingly lower and efficient elimination treatment processes are being implemented in order to meet these requirements. Metals contaminants at low concentration are difficult to remove from water. Chemical precipitation and other methods become inefficient when contaminants are present in trace concentrations and the process of adsorption is one of the few alternatives available for such situations. This book describes the adsorption method in the removal of selected heavy metals present as cations (Cd2+, Cu2+ and Pb2+) or oxyanions (Cr(VI) and As(V)) using iron oxide coated sand (IOCS) and granular ferric hydroxide (GFH). The effects of pH, natural organic matter (fulvic acid (FA)) and interfering ions (PO43-, Ca2+) on the adsorption efficiency were also assessed. The sorption reactions that take place at the surface of the adsorbent were also described through the surface complexation modelling for Cd2+, Cu2+ and Pb2+ adsorption. Batch adsorption tests and rapid small scale column tests (RSST) were used as laboratory methods.
Download or read book Ion Exchange and Solvent Extraction written by Jacob A. Marinsky and published by CRC Press. This book was released on 1997-02-21 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Volume 13 of this important series continues in the tradition of its widely received predecessors, presenting current advances and results in solvent extraction. Contains nearly 800 helpful drawings, tables, equations and bibliographic citations."
Download or read book Groundwater Arsenic Remediation written by Parimal Pal and published by Butterworth-Heinemann. This book was released on 2015-05-15 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arsenic abatement from groundwater in locations with a central water distribution system is relatively simple. The real challenge is selecting the most effective and affordable treatment and scale up option for locations which lack the appropriate infrastructure. Groundwater Arsenic Remediation: Treatment Technology and Scale UP provides the latest breakthrough groundwater treatment technologies and modeling and simulation methods for project scale up and eventually field deployment in locations which lack the proper central water distribution system to ensure arsenic free groundwater. - Covers the different removal methods, such as chemical, adsorption, separation by membranes, and membrane distillation - Includes the state-of-the-art modeling & simulation methods for optimization and field deployment - Provides economic and comparative analysis of each arsenic treatment technology
Download or read book Use of Adsorbents for the Removal of Pollutants from Wastewater written by Gordon McKay and published by CRC Press. This book was released on 1995-10-25 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of Adsorbents for the Removal of Pollutants from Wastewater describes the most commonly occurring industrial effluents, and presents direct means and methodologies for treating them. In addition to its excellent introduction to pollutants, this book contains all of the basics you need for understanding the characteristics and applications of adsorbent materials. With this book, you can choose from a wide variety of traditional and novel adsorbents, including alternative, relatively inexpensive adsorbents.
Download or read book Development and Evaluation of Innovative Iron containing Porous Carbon Adsorbents for Arsenic Removal written by Zhimang Gu and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two types of carbon based iron-containing adsorbents, As-GAC and FeOMC, were developed for arsenic removal from drinking water in this dissertation. Granular activated carbon-based iron-containing adsorbents (As-GAC) was developed by primarily using GAC as a supporting medium for ferric iron that was impregnated by ferrous chloride (FeCl2) treatment, followed by chemical oxidation. An ordered nano-structured adsorbent, iron-containing ordered mesoporous carbon (FeOMC) was synthesized and developed by involving in synthesis of ordered silica template SBA-15, in situ polymerization of mono acrylic acid (AA) in the silica template followed by carbonization and template removal to obtain ordered mesoporous carbon (OMC), and iron impregnation. Adsorbents were developed by optimizing the preparation conditions, including initial Fe concentration, oxidant type and dosage, and AC or OMC types, etc. and they were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM) with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and nitrogen adsorption-desorption analyses, etc. The ability of adsorbents for arsenic removal was evaluated by both batch and column studies. Effects of ionic strength, pH, and other competing constituents on the arsenic removal were also studied in batch systems. Redox transformation and surface characteristics of carbon based adsorbents were investigated. Adsorption of arsenic on adsorbents was modeled by the surface complexation model.
Download or read book Arsenic Removal from Water Using Ferric Hydroxide Coprecipitation in Acidic Conditions written by Tim Lee Kirk and published by . This book was released on 1993 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
