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Author : Barika Renee Poole
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (56 download)
Download or read book Point-of-use Water Treatment for Arsenic Removal Through Iron Oxide Coated Sand written by Barika Renee Poole and published by . This book was released on 2002 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hongxu Yu
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (689 download)
Download or read book In Situ Groundwater Arsenic Removal Using Iron Oxide-coated Sand written by Hongxu Yu and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In many regions of the world, groundwater is contaminated with a high level of arsenic that must be treated before it can be safely used as drinking water. In situ immobilization of arsenic from groundwater within subsurface environment could have major advantages over the conventional above-ground chemical coagulation-precipitation treatment process. In this study, we develop a novel technique that can in situ emplace iron oxides onto the sand grain surface of porous media under mild chemical and temperature conditions. The technique involves sequential injections of a preconditioned ferrous iron solution and an oxidant solution and then orchestrate the advective-diffusive transport of the two reagents in porous media to create an overlapped reaction zone where ferrous iron is oxidized and precipitated on the sand grain surfaces. We demonstrate through bench-scale column tests the feasibility of using this technique to create a large-scale iron oxide-enriched reactive barrier in subsurface environment for in situ removal of arsenic. A sand filter with a fresh iron oxide coating can treat thousands of pore volumes of water contaminated with dozens of ppb arsenic before the coating needs to be regenerated. Arsenic breakthrough curves through the sand filter suggest that both reversible adsorption and irreversible precipitation are responsible for removing arsenic from the water. Unlike conventional excavate-and-fill permeable reactive barriers, the treatment capacity of our in situ created barrier can be in situ regenerated and replenished with a fresh coating.
Author : Robert Warder
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (437 download)
Download or read book Removal of Arsenic from Water by Iron Oxide Coated Sand and Activated Alumina written by Robert Warder and published by . This book was released on 1999 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sharoz Kumar Sharma
Publisher : CRC Press
ISBN 13 : 1000445577
Total Pages : 216 pages
Book Rating : 4.0/5 (4 download)
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.
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428901515
Total Pages : 147 pages
Book Rating : 4.4/5 (289 download)
Download or read book Arsenic removal from drinking water by ion exchange and activated alumina plants written by and published by DIANE Publishing. This book was released on with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : M. Feroze Ahmed
Publisher :
ISBN 13 :
Total Pages : 298 pages
Book Rating : 4.3/5 (91 download)
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.
Author :
Publisher : DIANE Publishing
ISBN 13 : 1428902112
Total Pages : 245 pages
Book Rating : 4.4/5 (289 download)
Download or read book Proposed arsenic in drinking water rule regulatory impact analysis written by and published by DIANE Publishing. This book was released on with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Prosun Bhattacharya
Publisher : IWA Publishing
ISBN 13 : 1843393859
Total Pages : 308 pages
Book Rating : 4.8/5 (433 download)
Download or read book Best Practice Guide on the Control of Arsenic in Drinking Water written by Prosun Bhattacharya and published by IWA Publishing. This book was released on 2017-07-15 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arsenic in drinking water derived from groundwater is arguably the biggest environmental chemical human health risk known at the present time, with well over 100,000,000 people around the world being exposed. Monitoring the hazard, assessing exposure and health risks and implementing effective remediation are therefore key tasks for organisations and individuals with responsibilities related to the supply of safe, clean drinking water. Best Practice Guide on the Control of Arsenic in Drinking Water, covering aspects of hazard distribution, exposure, health impacts, biomonitoring and remediation, including social and economic issues, is therefore a very timely contribution to disseminating useful knowledge in this area. The volume contains 10 short reviews of key aspects of this issue, supplemented by a further 14 case studies, each of which focusses on a particular area or technological or other practice, and written by leading experts in the field. Detailed selective reference lists provide pointers to more detailed guidance on relevant practice. The volume includes coverage of (i) arsenic hazard in groundwater and exposure routes to humans, including case studies in USA, SE Asia and UK; (ii) health impacts arising from exposure to arsenic in drinking water and biomonitoring approaches; (iii) developments in the nature of regulation of arsenic in drinking water; (iv) sampling and monitoring of arsenic, including novel methodologies; (v) approaches to remediation, particularly in the context of water safety planning, and including case studies from the USA, Italy, Poland and Bangladesh; and (vi) socio-economic aspects of remediation, including non-market valuation methods and local community engagement.
Author : Calvin Chia-Hung Cheng
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (133 download)
Download or read book Enhanced Column Filtration for Arsenic Removal from Water written by Calvin Chia-Hung Cheng and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Arsenic is ubiquitous in water sources around the world and is highly toxic. While precipitation and membrane filtration techniques are successfully implemented in developed cities, they are unsuitable for rural and low-resource settings lacking centralized facilities. This thesis presents the use of ultra-small iron oxide (Fe2O3) nanoparticles functionalized on sand granules for use as a house-hold scale adsorption filter. Water-stable Îą-Fe2O3 (hematite) nanoparticles (
Author : Y. B. Gebreyowhannes
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (637 download)
Download or read book Effect of Silica and PH on Arsenic Removal by Iron-oxide Coated Sand written by Y. B. Gebreyowhannes and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W.R. Chappell
Publisher : Gulf Professional Publishing
ISBN 13 : 9780444514417
Total Pages : 564 pages
Book Rating : 4.5/5 (144 download)
Download or read book Arsenic Exposure and Health Effects V written by W.R. Chappell and published by Gulf Professional Publishing. This book was released on 2003-12-18 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authoritative articles in this book represent the state-of-the-art in arsenic research. Arsenic experts from around the world - participants in the Fifth International Conference on Arsenic Exposure and Health Effects organized by the Society for Environmental Geochemistry and Health in 2002 - present their critical findings. The authors share their latest arsenic research findings in Occurrence, Epidemiology, Biomarkers and Animal Models, Mode of Action, Mode of Action, Risk Estimation, Intervention and Medical Treatment, and Water Treatment and Remediation. As in past conferences, the first report of elevated arsenic exposures in a new country was given. The Conference introduced the finding of arsenic contamination in Nepal and updates of the arsenic problems in Bangladesh, India, Vietnam are included. A vital contribution to arsenic study and policy making, this volume examines the global impact of the toxin and discusses arsenic in the environment, mechanisms of arsenic metabolism and carcinogenesis, water treatment technology, and medical care. Arsenic Exposure and Health Effects V offers informed, challenging insights into a highly important and controversial topic.
Author :
Publisher : Elsevier
ISBN 13 : 0128138939
Total Pages : 188 pages
Book Rating : 4.1/5 (281 download)
Download or read book Harnessing Nanoscale Surface Interactions written by and published by Elsevier. This book was released on 2019-11-24 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harnessing Nanoscale Surface Interactions: Contemporary Synthesis, Applications and Theory provides coverage of contemporary theoretical and experimental approaches to understanding the interactions of molecules with nanomaterial surfaces and how to utilize these processes for improved synthesis and application of materials. The book reviews recently developed theoretical techniques to explore bonding interactions in nanoclusters and small molecules, along with modern molecular dynamics approaches for investigation adsorption of large molecules on nanomaterials. Novel experimental approaches are described that provide improved control of the synthesis of metal nanoparticles and measurement of their absorption properties. The potential for nanomaterials to address a range of environmental problems is also demonstrated by a selection of specific applications. Chapters discuss experimental synthesis approaches, experimental analysis and applications, and theoretical approaches for harnessing nanoscale surface interactions. - Includes exploration of the latest theoretical techniques, including regional density functional theory and molecular dynamics simulations - Addresses nanoscale interfaces and how they relate to the toxicity of nanomaterials, crucial for potential diagnosis and medical applications
Author : Gary R. Peyton
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (31 download)
Download or read book Development of Low Cost Treatment Options for Arsenic Removal in Water Treatment Facilities written by Gary R. Peyton and published by . This book was released on 2006 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Sunday Abia
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (781 download)
Download or read book In Situ Iron Oxide Emplacement for Groundwater Arsenic Remediation written by Thomas Sunday Abia and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Iron oxide-bearing minerals have long been recognized as an effective reactive media for arsenic-contaminated groundwater remediation. This research aimed to develop a technique that could facilitate in situ oxidative precipitation of Fe3+ in a soil (sand) media for generating a subsurface iron oxide-based reactive barrier that could immobilize arsenic (As) and other dissolved metals in groundwater. A simple in situ arsenic treatment process was successfully developed for treating contaminated rural groundwater using iron oxide-coated sand (IOCS). Using imbibition flow, the system facilitated the dispersive transport of ferrous iron (Fe2+) and oxidant solutions in porous sand to generate an overlaying blanket where the Fe2+ was oxidized and precipitated onto the surface as ferric oxide. The iron oxide (FeOx) emplacement process was significantly affected by (1) the initial surface area and surface-bound iron content of the sand, (2) the pH and solubility of the coating reagents, (3) the stability of the oxidant solution, and (4) the chemical injection schedule. In contrast to conventional excavate-and-fill treatment technologies, this technique could be used to in situ replace a fresh iron oxide blanket on the sand and rejuvenate its treatment capacity for additional arsenic removal. Several bench-scale experiments revealed that the resultant IOCS could treat arsenic-laden groundwater for extended periods of time before approaching its effective life cycle. The adsorption capacity for As(III) and As(V) was influenced by (1) the amount of iron oxide accumulated on the sand surface, (2) the system pH, and (3) competition for adsorption sites from other groundwater constituents such as silicon (Si) and total dissolved solids (TDS). Although the IOCS could be replenished several times before exhaustion, the life cycle of the FeOx reactive barrier may be limited by the gradual loss of hydraulic conductivity induced by the imminent reduction of pore space over time.
Author : Dennis A. Clifford
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.3/5 (121 download)
Download or read book Arsenic (III) and Arsenic (V) Removal from Drinking Water in San Ysidro, New Mexico written by Dennis A. Clifford and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Едуардас Миежелаитис
Publisher :
ISBN 13 :
Total Pages : 255 pages
Book Rating : 4.:/5 (55 download)
Download or read book Стихотворения written by Едуардас Миежелаитис and published by . This book was released on 1984 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Phyllis Frank
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.3/5 (91 download)
Download or read book Arsenic (III) Oxidation and Removal from Drinking Water written by Phyllis Frank and published by . This book was released on 1986 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
