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In Situ Groundwater Arsenic Removal Using Iron Oxide Coated Sand
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Book Synopsis In Situ Groundwater Arsenic Removal Using Iron Oxide-coated Sand by : Hongxu Yu
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.
Book Synopsis In Situ Iron Oxide Emplacement for Groundwater Arsenic Remediation by : Thomas Sunday Abia
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.
Book Synopsis Point-of-use Water Treatment for Arsenic Removal Through Iron Oxide Coated Sand by : Barika Renee Poole
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:
Book Synopsis Arsenic Removal Using Iron Coated Adsorbents by : Sisi Que
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.
Book Synopsis In-Situ Remediation of Arsenic-Contaminated Sites by : Jochen Bundschuh
Download or read book In-Situ Remediation of Arsenic-Contaminated Sites written by Jochen Bundschuh and published by CRC Press. This book was released on 2018-10-30 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing an introduction, the scientific background, case studies and future perspectives of in-situ arsenic remediation technologies for soils, soil water and groundwater at geogenic and anthropogenic contaminated sites. The case studies present in-situ technologies about natural arsenic, specifically arsenate and arsenite, but also about organic arsenic compounds. This work covers geochemical, microbiological and plant ecological solutions for arsenic remediation. It will serve as a standard textbook for (post-)graduate students and researchers in the field of Environmental Sciences and Hydrogeochemistry as well as researchers, engineers, environmental scientists and chemists, toxicologists, medical scientists and even for general public seeking an in-depth view of arsenic which had been classed as a carcinogen. This book aims to stimulate awareness among administrators, policy makers and company executives of in-situ remediation technologies at sites contamined by arsenic and to improve the international cooperation on the subject.
Book Synopsis Adsorptive Iron Removal from Groundwater by : Sharoz Kumar Sharma
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.
Book Synopsis Removal of Arsenic from Water by Iron Oxide Coated Sand and Activated Alumina by : Robert Warder
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:
Book Synopsis Arsenic Remediation of Drinking Water Using Iron-oxide Coated Coal Bottom Ash by :
Download or read book Arsenic Remediation of Drinking Water Using Iron-oxide Coated Coal Bottom Ash written by and published by . This book was released on 2010 with total page 1446 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe laboratory and field results of a novel arsenic removal adsorbent called 'Arsenic Removal Using Bottom Ash' (ARUBA). ARUBA is prepared by coating particles of coal bottom ash, a waste material from coal fired power plants, with iron (hydr)oxide. The coating process is simple and conducted at room temperature and atmospheric pressure. Material costs for ARUBA are estimated to be low (~;;$0.08 per kg) and arsenic remediation with ARUBA has the potential to be affordable to resource-constrained communities. ARUBA is used for removing arsenic via a dispersal-and-removal process, and we envision that ARUBA would be used in community-scale water treatment centers. We show that ARUBA is able to reduce arsenic concentrations in contaminated Bangladesh groundwater to below the Bangladesh standard of 50 ppb. Using the Langmuir isotherm (R2 = 0.77) ARUBA's adsorption capacity in treating real groundwater is 2.6x10-6 mol/g (0.20 mg/g). Time-to-90percent (defined as the time interval for ARUBA to remove 90percent of the total amount of arsenic that is removed at equilibrium) is less than one hour. Reaction rates (pseudo-second-order kinetic model, R2>_ 0.99) increase from 2.4x105 to 7.2x105 g mol-1 min-1 as the groundwater arsenic concentration decreases from 560 to 170 ppb. We show that ARUBA's arsenic adsorption density (AAD), defined as the milligrams of arsenic removed at equilibrium per gram of ARUBA added, is linearly dependent on the initial arsenic concentration of the groundwater sample, for initial arsenic concentrations of up to 1600 ppb and an ARUBA dose of 4.0 g/L. This makes it easy to determine the amount of ARUBA required to treat a groundwater source when its arsenic concentration is known and less than 1600 ppb. Storing contaminated groundwater for two to three days before treatment is seen to significantly increase ARUBA's AAD. ARUBA can be separated from treated water by coagulation and clarification, which is expected to be less expensive than filtration of micron-scale particles, further contributing to the affordability of a community-scale water treatment center.
Book Synopsis Technologies for Arsenic Removal from Drinking Water by : M. Feroze Ahmed
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.
Book Synopsis Removal of heavy metals from groundwater using iron oxide coated sand (IOCS) by : A.T. Esayas
Download or read book Removal of heavy metals from groundwater using iron oxide coated sand (IOCS) written by A.T. Esayas and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Arsenic Removal from Contaminated Groundwater by : Sirshendu De
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.
Book Synopsis The Global Arsenic Problem by : Nalan Kabay
Download or read book The Global Arsenic Problem written by Nalan Kabay and published by CRC Press. This book was released on 2010-04-26 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: A prevalent and increasingly important issue, arsenic removal continues to be one of the most important areas of water treatment. Conventional treatment plants may employ several methods for removing arsenic from water. Commonly used processes include oxidation, sedimentation, coagulation and filtration, lime treatment, adsorption onto sorptiv
Book Synopsis Effect of Silica and PH on Arsenic Removal by Iron-oxide Coated Sand by : Y. B. Gebreyowhannes
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:
Book Synopsis Effect of pH on in-situ production of iron oxide coated media for arsenic removal by : Y.O. Olaniyan
Download or read book Effect of pH on in-situ production of iron oxide coated media for arsenic removal written by Y.O. Olaniyan and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Best Practice Guide on the Control of Arsenic in Drinking Water by : Prosun Bhattacharya
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.
Book Synopsis Fate of Arsenic in the Environment by : M. Feroze Ahmed
Download or read book Fate of Arsenic in the Environment written by M. Feroze Ahmed and published by . This book was released on 2003 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chiefly includes papers with reference to Bangladesh.
Book Synopsis Arsenic Treatment Technologies for Soil, Waste, and Water by :
Download or read book Arsenic Treatment Technologies for Soil, Waste, and Water written by and published by DIANE Publishing. This book was released on 2002 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
