Assessing Arsenic Removal By Metal Hydroxide By Adsorptive Media Using Rapid Small Scale Column Tests PDF Download
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Author | : |
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Total Pages | : 50 |
Release | : 2008 |
Genre | : Water |
ISBN | : |
Download Assessing Arsenic Removal by Metal (Hydr)Oxide by Adsorptive Media Using Rapid Small Scale Column Tests Book in PDF, ePub and Kindle
The lowering of the maximum contaminant level for arsenic in drinking water from 50 to 10 micrograms per liter has posed significant technical and financial challenges to water treatment facilities throughout the United States. To assist small water systems (less than 10,000 customers) in meeting the new standard, EPA announced in October 2001 an initiative, the Arsenic Rule Implementation Research Program, to conduct a series of full-scale, on-site demonstrations of arsenic removal technologies, process modifications, and engineering approaches applicable to small systems. Of the 40 project sites under the Round 1 and Round 2 demonstration program, 23 selected adsorptive media technology because of its ease of operation.
Author | : Jacqueline Pui Yun Chin |
Publisher | : |
Total Pages | : |
Release | : 2012 |
Genre | : |
ISBN | : 9781267967800 |
Download Rapid Small-scale Column Tests of Metal-based Adsorbent Media for Arsenic Removal from Groundwater Sources in California Book in PDF, ePub and Kindle
The United States Environmental Protection Agency (EPA) lowered the maximum contaminant level (MCL) for arsenic in drinking water in 2001, effective January 2006, from 50 micrograms per liter ([mu]g/L) to 10 [mu]g/L resulting in increased development of arsenic removal technologies. Water systems throughout the U.S., in particular small water systems, have found it difficult to meet this MCL with the resources they have. The EPA has created a series of documents to assist these systems in choosing a cost-effective water treatment technology with recommendations for adsorption technology. When deciding on adsorption technology, there is a plethora of adsorbent media to select from, such that costs will vary drastically from one media to the other. In this work, four metal-based iron hydroxides (granular ferric hydroxide, Bayoxide E33 goethite, Metsorb G titanium dioxide, and NXT-2 lanthanum hydroxide) were compared using rapid small scale column tests (RSSCT). The RSSCTs were conducted with three groundwater sources from select communities in the Central Valley region of California to determine impacts on arsenic adsorption capacity. The breakthrough curves from the RSSCTs were used to approximate the cost of adsorption treatment with respect to replacing adsorbent media. The results of this work suggest Bayoxide E33 may be the cost effective treatment option for the small water systems that were evaluated. Interferences in effective arsenic removal include phosphorus, silica, high arsenic concentrations, low alkalinity, and high pH. The RSSCTs completed for Manteca groundwater supplies were packed with Bayoxide E33 and validated the dependence of arsenic adsorption capacity on pH, phosphorus, arsenic, and alkalinity.
Author | : Alicia Renee Aragon |
Publisher | : |
Total Pages | : 288 |
Release | : 2004 |
Genre | : Metallic oxides |
ISBN | : |
Download Development of a Rapid Small-scale Column Testing Procedure for the Evaluation of Arsenic Adsorption Media Book in PDF, ePub and Kindle
Author | : Nalan Kabay |
Publisher | : CRC Press |
Total Pages | : 270 |
Release | : 2010-04-26 |
Genre | : Science |
ISBN | : 0203843398 |
Download The Global Arsenic Problem Book in PDF, ePub and Kindle
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
Author | : Abdelazim M. Negm |
Publisher | : Springer |
Total Pages | : 392 |
Release | : 2018-12-08 |
Genre | : Science |
ISBN | : 3319928538 |
Download Water Resources in Slovakia: Part I Book in PDF, ePub and Kindle
This volume presents up-to-date information on the status and assessment of water resources in Slovakia and methods for their development. The major themes include key facts about Slovakian water resources, their assessment and development; water supply and demand; irrigation water; groundwater; water and sediment quality with a focus on mining water; wastewater management in Slovakia; and rainwater management. The book closes with general conclusions and recommendations for future research. It is a valuable resource for graduate students and researchers as well as for decision makers involved in sustainable development.
Author | : Andrew Ryan Schmalenbach |
Publisher | : |
Total Pages | : |
Release | : 2014 |
Genre | : |
ISBN | : 9781321609844 |
Download Adsorptive Removal of Arsenic and Chromium from Two California Groundwater Sources Using Rapid Small Scale Column Tests Book in PDF, ePub and Kindle
At the federal level, the United States Environmental Protection Agency (US EPA) started enforcing a maximum contaminant level (MCL) of 10 [mu]g/L arsenic in public water systems in 2006, down from 50 [mu]g/L. As of July 1st, 2014 the state of California started enforcing a 10 [mu]g/L MCL for hexavalent chromium, formerly 50 [mu]g/L total chromium. These changes have sparked increased demand for cost effective treatment technologies for these contaminants, which has in turn driven research in the field. Iron oxide adsorbents are an established treatment method for arsenic removal, but have not been proven effective in treating chromium. Despite extensive documentation on the effectiveness of treating arsenic with iron oxide adsorbents, variations in source water qualities result in bed lifespans that must be estimated on a case-by-case basis. Scaled down adsorption tests that can be completed in 2-4 weeks, known as rapid small-scale column tests (RSSCTs), were used to conduct two studies. In one study, an established arsenic adsorbent (E-33) was subjected via RSSCT to a particular arsenic contaminated groundwater to quantify its removal capacity for that water source. In another study, a new and largely untested iron oxide adsorbent (E-33 HC) was tested in an RSSCT with chromium contaminated groundwater to measure its effectiveness for chromium removal. E-33 treated approximately 15,000 bed volumes of source water in the first study. The second study indicated that E-33 HC was not effective in removing chromium from the source water tested.
Author | : Vu Linh Nguyen |
Publisher | : |
Total Pages | : |
Release | : 2011 |
Genre | : |
ISBN | : 9781124666037 |
Download Effect of Interferences on the Breakthrough of Arsenic Book in PDF, ePub and Kindle
The influences of three important interferences (silica, phosphate, and vanadate) and the effect of different pH levels and initial arsenate concentrations on the breakthrough of arsenic in adsorptive media columns were examined by using the Rapid Small Scale Column Test with a 35−2 fractional factorial design. Three commercially available adsorbents used for arsenic removal (E33, GFH and Metsorb) were tested. Results indicated that GFH was more susceptible to water quality changes than Metsorb and E33 under conditions tested. GFH also adsorbed more anions than the other two media. The pH was the factor that had the most impact on the performance of the columns, followed by arsenic concentration and silica concentration. Lowering pH from 8.3 to 7.0 resulted in an increase of the mean bed volume treated until 10 [mu]g/L arsenic breakthrough by 40, 12 and 18 thousands BV treated by GFH, E33 and Metsorb columns, respectively. However, at high silica concentration, lowering pH did not increase the performance of the media. GFH and Metsorb were more sensitive to changes in arsenic concentration at low pH than at high pH. Although vanadium and phosphate were previously reported to reduce arsenic adsorption in batch tests, in column mode with the presence of competitors, their effect was insignificant compared to that of pH, arsenic or silica under the conditions used in this study.
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Publisher | : |
Total Pages | : 112 |
Release | : 2005 |
Genre | : Carbon, Activated |
ISBN | : |
Download Rapid Small Scale Column Testing for Evaluating Arsenic Adsorbents Book in PDF, ePub and Kindle
Author | : Gary L. Amy |
Publisher | : American Water Works Association |
Total Pages | : 164 |
Release | : 2005 |
Genre | : Nature |
ISBN | : 1583213996 |
Download Adsorbent Treatment Technologies for Arsenic Removal Book in PDF, ePub and Kindle
Accompanying CD-ROM includes Excel document "Arsenic adsorbent design and costing tool".
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Total Pages | : 168 |
Release | : 1996 |
Genre | : |
ISBN | : |
Download Protocol for Equipment Verification Testing for Arsenic Removal Book in PDF, ePub and Kindle
This document is the study protocol to be used for verification testing of equipment designed to achieve arsenic removal. In order to participate in the equipment verification process, the equipment Manufacturer is requested to adhere to the requirements of this study protocol in developing a Manufacturer Field Operations Document. The final submission of the Manufacturer Field Operations Document shall: (1) include the information requested in this protocol; (2) conform to the format identified herein; and (3) conform to the specific NSF International (NSF) Equipment Verification Testing Plan or Plans related to the statement(s) of capabilities that are to be verified. The Manufacturer Field Operations Document may include more than one Testing Plan. For example, testing might be undertaken to verify performance of a package plant employing coagulation and filtration for arsenic removal and for removal of microbiological and particulate contaminants or for removal of disinfection by-product precursors.