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Author : Yu-Chien Liu
Publisher :
ISBN 13 :
Total Pages : 178 pages
Book Rating : 4.:/5 (357 download)
Download or read book Feasibility Study of Arsenic Removal by Adsorption Onto Iron Oxide Surface written by Yu-Chien Liu and published by . This book was released on 1996 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sundaravadivelnathan Ponnusamy
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (927 download)
Download or read book Assessing the Feasibility of Algal Biofuel Production and Novel Adsorbents for Arsenic Removal written by Sundaravadivelnathan Ponnusamy and published by . This book was released on 2015 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the second part of the research, Sol-gel derived activated alumina, supercritical carbon dioxide dried sol-gel derived activated alumina, and iron-aluminium hydrous oxides were synthesized to study the adsorption equilibrium and kinetics of arsenic removal. The main application of this study is to remove arsenic at very low concentrations from drinking water. The adsorbents were characterized using scanning electron microscope (SEM) and nitrogen adsorption for their surface and pore texture properties. The iron-aluminium hydrous oxide adsorbent was independent of the initial pH of the solution for arsenic removal. Adsorption isotherm arsenic onto sol-gel derived activated alumina is explained by the Freundlich adsorption model and the Langmuir adsorption model best explains the adsorption isotherm of arsenic onto supercritical CO2 dried sol-gel derived activated alumina and iron-aluminium hydrous oxides. Supercritical CO2 dried sol-gel derived activated alumina showed the highest adsorption capacity of 8.99 mg/g. A pseudo-second order model is used to explain adsorption reaction kinetics of arsenic onto the adsorbents and the pseudo-second order model fits the experimental data very well with a R2 value greater than 0.99.
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 : Sirshendu De
Publisher : The Energy and Resources Institute (TERI)
ISBN 13 : 8179933830
Total Pages : 306 pages
Book Rating : 4.1/5 (799 download)
Download or read book Arsenic Removal from Contaminated Groundwater written by Sirshendu De and published by The Energy and Resources Institute (TERI). This book was released on 2012-01-01 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contamination of groundwater with arsenic is being considered a pervasive and critical issue in recent years. Large areas in India, Bangladesh, South East Asia, and other parts of the world are suffering from this problem. Arsenic Removal from Contaminated Groundwater presents a comprehensive discussion on various important issues, including state-of-the-art arsenic removal technologies, preparation and performance analysis of laterite, and scale-up issues and design of a household filter. It also expounds the potentiality of raw laterite and treated laterite as low-cost arsenic adsorbents. The efficiency of adsorbent capacity is evaluated using real arsenic contaminated groundwater collected from an affected area in West Bengal, India. The topic is an emerging area and most of the work presented has the potential of field application.
Author : Kahlil Sucgang Apuzen
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (66 download)
Download or read book Arsenic Removal from Leviathan Acid Mine Drainage written by Kahlil Sucgang Apuzen and published by . This book was released on 2002 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gary L. Amy
Publisher : American Water Works Association
ISBN 13 : 1583213996
Total Pages : 164 pages
Book Rating : 4.5/5 (832 download)
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".
Author : Sisi Que
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783659289330
Total Pages : 64 pages
Book Rating : 4.2/5 (893 download)
Download or read book Arsenic Removal Using Iron Coated Adsorbents written by Sisi Que and published by LAP Lambert Academic Publishing. This book was released on 2012 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Arsenic is viewed as being synonymous with toxicity, and now arsenic in natural waters is a worldwide problem. Among twenty-one countries' people are affected by groundwater arsenic contamination, like the Bangladesh, India and China. In this book, readers can get an overview of arsenic background information and available arsenic remediation methods. In this work, a model for predicting arsenic adsorption on iron coated sand based on surface complexation modeling was developed. The model can be used to calculate the arsenic adsorption performance with variable initial arsenic concentration and over the pH range 5 to 8 when the following data are available: 1) maximum adsorption capacity of the adsorbent; 2) initial arsenic concentration and mass of the adsorbent; and 3) pH value. The average difference between model calculation results (shown in this work) and experimental results from three experimental studies is less than 5%. Additionally, based on the improved model correlation provided by the bidentate assumption, there is a strong case for the main surface complexes between arsenic and Fe-sand being bidentate complexes.
Author : Dr. Ashok Kumar Jha
Publisher : Booksclinic Publishing
ISBN 13 : 9390655471
Total Pages : 142 pages
Book Rating : 4.3/5 (96 download)
Download or read book ARSENIC PROBLEM AND MITIGATION written by Dr. Ashok Kumar Jha and published by Booksclinic Publishing. This book was released on 2021-01-12 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The present book on Arsenic has painted a small portion of the vast canvas of water pollution by focusing on the specified areas of the Gangetic plain. In India, the firstcase of arsenic contamination came to light in 1980 in West Bengal. Subsequently many chemists and biologists started examining arsenic content in water in various parts of Bihar and my team started work in some new areas of Gangetic plain in Bhagalpur district. Switching to groundwater for potable water resulted in decrease of bacterial contamination on one hand and on the other this resulted in the vast population being affected by arsenic contaminated water. This book deals with some safer techniques of arsenic removal. The arsenic removal technologies are based on solar oxidation, coagulation, sedimentation, filtration, adsorption, ion exchange and biological processes. In coagulation micro-filtration Fe(III) and Al(III) salts are added to form arsenic-sorbing flocs which is removed by membrane filtration. This method increases Fe(III) and Al(III) in water. Adsorbents like activated alumina, ferric hydroxides, iron oxide coated sand and activated carbon have been used in columns to remove arsenic from aqueous medium. Thus many methods of arsenic removal have been discussed. The search for low-cost technologies has directed towards bentonite deposits of Rajmahal hills. Bentonite minerals are smectite group of mineral having 2:1 dioctahedral structure. Though these minerals are abundant inmost of the countries of the world, Rajmahal hill bentonites have not been studied for many of its important properties as yet. Our research team have collected bentonite minerals from different parts of the hill and worked on removal of heavy metals, dyes and arsenic from aqueous medium. Efforts have been made to use different derivatives of bentonite minerals for remediation of heavy metals including arsenic. A comparative study of remediation potential has been done. All the useful experimental data have been incorporated in the book to have a clear understanding of the subject. Apart from this, the ability of agricultural solid wastes e.g maize stem powder, rice husk have also been tested for removal of arsenic inaqueous medium. In addition, researches have focused on the ability of biological materials to accumulate the toxicants. The major advantages of biosorption are low-cost, high efficiency and minimum use of chemicals. Latest techniques of analyses of arsenic both qualitative and quantitative have been discussed in the book. Analysis of arsenic has also been done by I.C.P and A.A.S. Possible causes of arsenic contamination in ground water, geochemistry and mechanism of entry in the Gangetic plain have also been discussed to make readers understand in the simplest manner. General chemistry of arsenic and its compounds have been discussed in chapter 1 and arsenic binding to DNA causing cancer with possible mechanisms have been incorporated in to the book after a careful and thorough review of journals. Arsenicosis problems, photographs of affected regions and hills have been added with a view to have a glimpse of the worsening situation at the ground level. I hope this book will be valuable for teachers, students and researchers pursuing advanced research on arsenic mitigation. The suggestions from any corner are most welcome and would be incorporated in the book for further improvement."
Author : John Parascandola
Publisher : Potomac Books, Inc.
ISBN 13 : 1597977039
Total Pages : 209 pages
Book Rating : 4.5/5 (979 download)
Download or read book King of Poisons written by John Parascandola and published by Potomac Books, Inc.. This book was released on 2012-10-31 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: For centuries, arsenic's image as a poison has been inextricably tied to images of foul play. In King of Poisons, John Parascandola examines the surprising history of this deadly element. From Gustave Flaubert to Dorothy Sayers, arsenic has long held a place in the literary realm as an instrument of murder and suicide. It was delightfully used as a source of comedy in the famous play Arsenic and Old Lace. But as Parascandola shows, arsenic has had a number of surprising real-world applications. It was frequently found in such common items as wallpaper, paint, cosmetics, and even candy, and its use in medical treatments was widespread. American ambassador Clare Boothe Luce suffered from exposure to arsenical paint in her study, and Napoleon's death has long been speculated to be the result of accidental or intentional poisoning. But arsenic poisoning is still a public menace. In the neighborhood surrounding American University in Washington, D.C., the army has undertaken a massive cleanup of artillery shells and bottles containing chemical warfare agents such as arsenical lewisite after a number of workmen and residents became ill. Arsenic contamination of the water supply in Bangladesh and in West Bengal, India, is a major public health problem today as well. From murder to crime fiction, from industrial toxin to chemical warfare, arsenic remains a powerful force in modern life.
Author : Zaid K. Chowdhury
Publisher : American Water Works Association
ISBN 13 : 1583212361
Total Pages : 404 pages
Book Rating : 4.5/5 (832 download)
Download or read book Implementation of Arsenic Treatment Systems: Process selection written by Zaid K. Chowdhury and published by American Water Works Association. This book was released on 2002 with total page 404 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 : Saidur Rahman Chowdhury
Publisher :
ISBN 13 :
Total Pages : 582 pages
Book Rating : 4.:/5 (16 download)
Download or read book Application of Mixed Iron Oxides in Subsurface Remediation Technologies written by Saidur Rahman Chowdhury and published by . This book was released on 2013 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heavy metal contamination of soil and groundwater has been a concern in water supply and public health in many countries where the water supply system draws primarily from groundwater. In the present study, mixed maghemite-magnetite nanoparticles have been used as adsorbents for Cr(VI), As and Cd(II) removal. From the study, it is apparent that the removal of Cr(VI), Cd(II) and As(V) by mixed iron oxide nanoparticles depends on pH, temperature, contact time, solid/liquid ratio and initial concentration of heavy metals. The results showed that Cr(VI) adsorption on mixed maghemite-magnetite was dependent on solution pH between 3 and 6. Theoretical multiplet analyses in X-ray photoelectron spectroscopy (XPS) study showed that during Cr adsorption, the amount of maghemite increased from 70 to 89%. Fe(II) was transformed into Fe(III) by the redox reaction and Cr(VI) species were reduced to Cr(III) species. In arsenic removal study, it was found that the percent of maghemite also increased for As(V) and As(III) adsorption. At the same time, the percentage of magnetite was reduced for both cases. Thus, a redox reaction occurred on the mixed magnetite-magheamite surface when arsenic was introduced. In cadmium removal study, adsorption capacity of mixed magh emite- magnetite for Cd(II) ions increased with an increase in the pH of the adsorbate solution. The results showed that 0.8 g/L of 20-60 nm maghemite-magnetite particles removed up to 1.5 mg/L Cd. The XPS surveys confirmed that As, Cr(VI) and Cd(II) ions may undergo oxidation-reduction reactions upon exposure to mixed maghemite-magnetite, or may be fixed by complexation to the oxygen atoms in the oxyhydroxy groups. The investigation of transport and chemical states analysis during a rsenic removal by monolith slag from nickel smelting revealed that slag was efficient in arsenic removal, attaining equilibrium sorption capacities in the range of 1000-1054 g/g for an initial arsenic concentration of C 0 = 10 mg/L. Column studies showed the sorption of arsenic by smelter slag (a waste material) was complex and involved both c hemisorption and physical sorption. Sorption capacities for As(V) were significantly higher for Ni smelter slag. Raman spectroscopy and XPS results demonstrate that the As reacted with a large proportion of the slag in the experiment. Thus, further investigation woul d be necessary to evaluate the applicability of mixed iron oxide loaded particles for subsurface remediation at field scale.
Author : Masakazu Kanematsu
Publisher :
ISBN 13 : 9781124907369
Total Pages : pages
Book Rating : 4.9/5 (73 download)
Download or read book Arsenate Removal by a Goethite-based Adsorbent written by Masakazu Kanematsu and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Potable water supplies drawn from groundwater with high levels of arsenic are a serious public heath concern all over the world. Although adsorption technology has been recognized as one of the promising technologies to remove arsenic, few quantitative studies have been conducted to elucidate the influence of water quality on arsenic removal by adsorption technology. In this study, the extended triple layer model (ETLM), a surface complexation model consistent with spectroscopic and theoretical molecular evidence, was first systematically tested for its capability to predict arsenic adsorption on a common goethite-based granular porous adsorptive media (Bayoxide E33®) under wide range of solution conditions. Adsorption equilibrium constants of arsenate, phosphate, and carbonate were determined in single-solute systems, and these constants were used to predict competitive interactions of those ions in dual-solute systems. The ETLM successfully predicted the competitive interactions using the adsorption equilibrium constants determined in single-solute systems. The arsenate (As(V)) removal performance of a fixed-bed adsorber packed with a goethite-based adsorbent was also systematically studied at different pH, initial arsenate concentration, and empty bed contact time (ECBT) in the absence and presence of competing ions (silicate, phosphate, and vanadate). Rapid small scale column tests (RSSCTs) were extensively conducted with synthetic waters in which water quality was controlled within the environmentally relevant range. The column study quantitatively elucidates influence of water quality and operating conditions on arsenate removal by fixed-bed iron oxide adsorber. Iron oxide nanoparticles were synthesized using the inverse flame synthesis method to develop a novel adsorbent that has higher adsorption capacity than commonly used commercial adsorbents. The iron oxide nanoparticles were synthesized and fabricated using the different inverse flame conditions. The developed iron oxide nanoparticle has much higher adsorption capacity than a widely-used commercial adsorbent, Bayoxide E33. Since the inverse flame synthesis is a cost effective and suitable for large production, it can be used to synthesis adsorbent for potable water treatment or environmental remediation.
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 : Putla Sudarsanam
Publisher : John Wiley & Sons
ISBN 13 : 1119772028
Total Pages : 388 pages
Book Rating : 4.1/5 (197 download)
Download or read book Heterogeneous Nanocatalysis for Energy and Environmental Sustainability, Volume 2 written by Putla Sudarsanam and published by John Wiley & Sons. This book was released on 2023-01-04 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explore the environmental applications of heterogeneous nanocatalysis in the field of alternative energy production In Volume 2: Environmental Applications of Heterogeneous Nanocatalysis for Energy and Environmental Sustainability, a team of distinguished researchers discusses the foundational concepts and practical applications of heterogeneous nanocatalysis for alternative energy production. Volume 2 focuses on the purification of auto exhaust pollutants and volatile organic compounds, as well as CO2 conversion and wastewater treatment over a range of nano-sized catalysts.
Author : Prosun Bhattacharya
Publisher : CRC Press
ISBN 13 : 1315629437
Total Pages : 730 pages
Book Rating : 4.3/5 (156 download)
Download or read book Arsenic Research and Global Sustainability written by Prosun Bhattacharya and published by CRC Press. This book was released on 2016-06-08 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Congress "Arsenic in the Environment" offers an international, multi- and interdisciplinary discussion platform for research and innovation aimed towards a holistic solution to the problem posed by the environmental toxin arsenic, with considerable societal impact. The congress has focused on cutting edge and breakthrough research in physical, chemical, toxicological, medical, agricultural and other specific issues on arsenic across a broader environmental realm. The Congress "Arsenic in the Environment" was first organized in Mexico City (As2006) followed by As2008 in Valencia, Spain, As2010 in Tainan, Taiwan, As2012 in Cairns, Australia and As2014 in Buenos Aires, Argentina. The 6th International Congress As2016 was held June 19-23, 2016 in Stockholm, Sweden and was entitled Arsenic Research and Global Sustainability. The Congress addressed the broader context of arsenic research along the following themes: Theme 1: Arsenic in Environmental Matrices and Interactions (Air, Water, Soil and Biological Matrices) Theme 2: Arsenic in Food Chain Theme 3: Arsenic and Health Theme 4: Clean Water Technology for Control of Arsenic Theme 5: Societal issues, Policy Studies, Mitigation and Management Long term exposure to low-to-medium levels of arsenic via contaminated food and drinking water can have a serious impact on human health and globally, more than 100 million people are at risk. Since the end of the 20th century, arsenic in drinking water (mainly groundwater) has emerged as a global health concern. In the past decade, the presence of arsenic in plant foods – especially rice – has gained increasing attention. In the Nordic countries in particular, the use of water-soluble inorganic arsenic chemicals (e.g. chromated copper arsenate, CCA) as wood preservatives and the mining of sulfidic ores have been flagged as health concern. The issue has been accentuated by discoveries of naturally occurring arsenic in groundwater, primarily in the private wells, in parts of the Fennoscandian Shield and in sedimentary formations, with potentially detrimental effects on public health. Sweden has been at the forefront of research on the health effects of arsenic, technological solutions for arsenic removal, and sustainable mitigation measures for developing countries. Hosting this Congress in Sweden was also relevant because historically Sweden has been one of the leading producer of As2O3 and its emission from the smelting industries in northern Sweden and has successfully implemented actions to reduce the industrial emissions of arsenic as well as minimizing the use of materials and products containing arsenic in since 1977. The Congress has gathered professionals involved in different segments of interdisciplinary research in an open forum, and strengthened relations between academia, industry, research laboratories, government agencies and the private sector to share an optimal atmosphere for exchange of knowledge, discoveries and discussions about the problem of arsenic in the environment and catalyze the knowledge generation and innovations at a policy context to achieve the goals for post 2015 Sustainable Development.
Author : Joan E. McLean
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (359 download)
Download or read book Behavior of Metals in Soils written by Joan E. McLean and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
