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    Development of an Iron-Oxide Coated Ceramic Filter for Removal of As(III) and As(V) in Developing Nations

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    Issue Date
    2011-08-31
    Author
    Robbins, Emily C.
    Publisher
    University of Kansas
    Format
    86 pages
    Type
    Thesis
    Degree Level
    M.S.
    Discipline
    Civil, Environmental, & Architectural Engineering
    Rights
    This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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    Abstract
    Over 4,000 children die each day due to diarrheal diseases which are often related to drinking unsafe water, and are often preventable with proper water treatment. Many regions of the world also suffer from high levels of arsenic due to natural and/or anthropogenic sources. Chronic arsenic poisoning leads to many maladies including skin, bladder and lung cancer, as well as non-carcinogenic arsenicosis symptoms including hyperpigmentation of skin, thickening hands and feet, and skin lesions. A new point-of-use (POU) technology using conventional ceramic filters coated with a ferric-iron coating to achieve simultaneous arsenic (III) and (V) removal along with filtrative disinfection has been developed in the research for this thesis. The Iron-Oxide Coated Ceramic Filter (IOCCF) is produced using the standard ceramic filter methods (see www.pottersforpeace.org) leading to a porous clay pot that will filter out most pathogens. The iron was shown to bond strongly with the ceramic filter such that no iron leaching occurs. Experiments were conducted on ceramic micro-columns prepared to have the exact thickness and properties of a full-scale ceramic filter. While no significant arsenic removal is achieved in a traditional ceramic filter, the IOCCF was shown to be capable of filtering arsenic for long periods of time with essentially no As breakthrough. For example, As concentrations in source water can be easily reduced from 250 µg/L to less than the 10 µg/L WHO and EPA guideline for arsenic for over 365 effective filter runs. As(V) was sorbed more effectively at lower pH values while sorption of As(III) was not as sensitive to pH. However, there was not a large difference in As(V) or As(III) removal performance over a pH range of 6 to 9. Filtration of lake water containing NOM reduced performance of As(III) and As(V) removal, but the IOCCF still removed both As species from natural water for a significant number of filter runs. As(III) and As(V) remain strongly adsorbed at normal pH levels, however more research is needed on this topic. Results also showed that the IOCCF retained the bacterial removal capabilities of the Potters for Peace Filter.
    URI
    http://hdl.handle.net/1808/10697
    Collections
    • Engineering Dissertations and Theses [705]
    • Theses [3743]

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
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    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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