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Friday, July 31, 2020 | History

2 edition of Selenium oxidation and removal by ion exchange found in the catalog.

Selenium oxidation and removal by ion exchange

Joan V. Boegel

Selenium oxidation and removal by ion exchange

by Joan V. Boegel

  • 115 Want to read
  • 26 Currently reading

Published by U.S. Environmental Protection Agency, Water Engineering Research Laboratory in Cincinnati, OH .
Written in

    Subjects:
  • Selenium.,
  • Ion exchange.,
  • Water -- Purification -- Ion exchange process.

  • Edition Notes

    StatementJoan V. Goegel and Dennis A. Clifford.
    ContributionsClifford, Dennis A., Water Engineering Research Laboratory.
    The Physical Object
    Pagination7 p. :
    ID Numbers
    Open LibraryOL17669980M

    Lenntech Water Treatment solutions is a design and manufacturing company serving numerous industries. Since , we’ve been delivering innovative and sustainable solutions for several applications and processes of water treatment, wastewater reuse and membrane separation. Selenium is considered to be persistent because, although it can change its ionic state, it cannot be degraded any further in the environment. Selenium is an essential micronutrient that can be incorporated into amino acids, proteins, and other biochemical intermediates (Maher et al. ).

    The references are recent and cite the most important journals in the field. The one glaring omission is the cursory treatment of ion exchange. In the USA the use of ion exchange materials constitutes a US$5 billion dollar a year market and represents the go-to technology for heavy metal removal from water. Heavy Metal Ion Separation by Functional Polymeric Membranes Takashi Hayashita Chap DOI: /bkch Publication Date (Print): May 5,

    Wastewater Treatment: Chemical Precipitation - View presentation slides online. It deals with the wastewater treatment by chemical precipitation to improve the performance of primary clarifiers, for the removal of heavy metals and for the removal of phosphorus from the wastewater. it also deals with the estimation of the chemical sludges generated during the chemical precipitation process.5/5(8). @article{osti_, title = {Ion chromatography}, author = {Tarter, J.G.}, abstractNote = {Similar in many ways to other liquid chromatographic techniques, ion chromatography (IC) is an invaluable method that is used all too rarely in chemical analysis. Its application is particularly promising in the analysis of inorganic anions, an area where more information is needed.


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Selenium oxidation and removal by ion exchange by Joan V. Boegel Download PDF EPUB FB2

Get this from a library. Selenium oxidation and removal by ion exchange. [Joan V Boegel; Dennis A Clifford; Water Engineering Research Laboratory.].

Selenium oxidation and removal by ion exchange book   Boegel and D. Clifford, Selenium Oxidation and Removal by Ion Exchange. PB AS, NTIS, Springfield, Virginia, Water Quality and Treatment: A Handbook of Community Water Supplies, p.

However, ion exchange and reverse osmosis were found to both remove greater than 95% of either Se(IV) or Se(VI) from drinking water.2'5 Because coagulation and lime softening were not always effective or applicable to small water systems, and because of the great costs associated with demineralization by ion exchange or reverse osmosis.

Gap1: Coagulation, ion exchange, electrocoagulation, biological and chemical reduction and so on are methods of removal selenium that have been used currently. These approaches are able to remove selenium to below 5 µg/L in optimal conditions (Hasan and Ranjan, ). However, incomplete technologies and expensive processing methods have Cited by: This work compares and models the adsorption of selenium and other anions on a neutral to alkaline surface (amorphous iron oxyhydroxide) and an acidic surface (manganese dioxide).

Selenium adsorption on these oxides is examined as a function of pH, particle concentration, oxidation state, and competing anion concentration in order to assess how Cited by: Selenium is a chemical element with the symbol Se and atomic number It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to rarely occurs in its elemental state or as pure ore compounds in the Earth's ciation: /sɪˈliːniəm/ ​(sə-LEE-nee-əm).

Ion Exchange and Inorganic Adsorption. Synthetic ion exchange resins developed for removal of anions such as sulfate and nitrate have proven Selenium oxidation and removal by ion exchange.

carbonate removal using lime with manganese oxide precipitation; ion exchange over a specific resin (e.g. Amberlite IRA from Rohm & Haas).

The removal of boron using reverse osmosis membranes primarily applies to seawater desalination treatment (see section desalination membrane application). bromine: the problem of bromates. Rohm and Haas Ion Exchange Ion exchange introduction 1 FD Sep ION EXCHANGE FOR DUMMIES An introduction Water Water is a liquid.

Water is made of water molecules (formula H2O). All natural waters contain some foreign substances, usually in small amounts. A process for the removal of soluble selenium from aqueous media comprising contacting the aqueous media with a porous support material having exchanged thereon metal ions selected from transition metal ions, alkali earth metal ions and mixtures by: Various treatment technologies have been proposed for selenium removal from wastewater, including adsorption [5,6], ion exchange [7], reverse osmosis [8], co-precipitation [9, A selenide is a chemical compound containing a selenium anion with oxidation number of −2 (Se 2−), much as sulfur does in a chemistry of the selenides and sulfides is similar.

Similar to sulfide, in aqueous solution, the selenide ion, Se 2−, is prevalent only in very basic neutral conditions, hydrogen selenide ion, HSe −, is most common.

the removal of heavy metals from industrial wastewater. Physico-chemical removal processes such as; adsorption on new adsorbents, ion exchange, membrane filtration, electrodialysis, reverse osmosis, ultrafiltration and photocatalysis were discussed.

Their advantages and Cited by: Oxidation/Filtration zPoint-of-Use Treatment Program Activated Alumina Iron Based Sorbent Reverse Osmosis 7. Estimate planning-level capital and operations and maintenance (O&M) costs for the mitiga-tion strategy using the costs curves provided in Section File Size: 1MB.

Figure 1. The sorption capacity of ion exchangers depending on pH. Additionally, ion exchangers possess: the iminodiacetate functional groups (-N{CH 2 COOH} 2), phenol (-C 6 H 4 OH), phosphonic (-PO 3 H 2) and phosphine (-PO 2 H) functional groups. These groups are acidic in nature and are dissociated with the exchange of H + or Na + ions for other cations from the by: Several tests for selenium removal were conducted at Red Dog mine: GE advanced metals removal process, electrochemical process (ion-exchange membrane with electrical currents), and RO membrane filtration [39,40,41,42].

A promising method that emerged was in-situ pit lake microbial by: Removal of selenium in drinking water by manganese greensand, iron oxide-coated sand and ion-exchange resin.

In: Water resources and the urban environment Proceedings of the National Conference on Environmental Engineering, Chicago, IL, June soils (Manning and Burau, ).

Selenium can be present in radioactive wastes (Scheinost and Charlet, ). The toxicity and bioavailability of As and Se in the environment depend on the oxidation–reduction (redox) conditions of the site (Masscheleyn et al., ; Tokunaga et.

The inorganic selenium (Se) species selenite, selenate and selenocyanate in waters are determined by anion exchange chromatography-hydride generation-inductively-coupled plasma-dynamic reaction cell-mass spectrometry (AEC-HG-ICP-DRC-MS) with instrumental detection limits ofand ng Se L −1, water has to be diluted ten-fold prior to analysis to overcome.

EPA//R/ October Monitored Natural Attenuation of Inorganic Contaminants in Ground Water Volume 2 Assessment for Non-Radionuclides Including Arsenic, Cadmium, Chromium, Copper, Lead, Nickel, Nitrate, Perchlorate, and Selenium Edited by Robert G. Ford, Richard T. Wilkin, & Robert W.

Puls U.S. Environmental Protection Agency Office of Research and Development National. Biological Denitrification Other Technologies Ion Exchange Pretreatment General Design Approach Metals Arsenic Selenium Ammonia Nitrate Radioactive Materials Column Regeneration Adsorption Activated Carbon Activated Alumina Fluoride Arsenic Membrane Filtration Reverse Osmosis Nanofiltration Electrodialysis Evaporation Evaporation Ponds.The most common Selenium ion is Se2- the selenide ion.

It is in the same group as oxygen and its most common ion in the oxide ion O Asked in Chemistry, Atoms and Atomic Structure, Selenium.Ion exchange systems are used for efficient removal of dissolved ions from water. Ion exchangers exchange one ion for another, hold it temporarily, and then release it to a regenerant solution.

In an ion exchange system, undesirable ions in the water supply are replaced with more acceptable ions.