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  • 1
    Publication Date: 2021-03-29
    Keywords: Environmental remediation; Material reactivity; Nanoscale iron; Roll-front; Zerovalent iron ; 551 ; Environment; Atmospheric Protection/Air Quality Control/Air Pollution; Climate Change; Environment, general; Soil Science & Conservation; Hydrogeology; Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution
    Language: English
    Type: article , publishedVersion
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  • 2
    Publication Date: 2021-03-29
    Keywords: Deep-bed filtration; Hydraulic conductivity; Modelling, Permeability loss; Zerovalent iron ; 551
    Language: English
    Type: article , submittedVersion
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  • 3
    Publication Date: 2021-03-29
    Description: Open-Access Publikationsfonds 2015
    Keywords: fluoride removal; frugal innovation; packed-bed filters; steel wool; water treatment; zero-valent iron ; 551
    Language: English
    Type: article , publishedVersion
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  • 4
    Publication Date: 2021-03-29
    Description: In the mining industry, the separation of economically valuable metals from gangue materials is a well established process. As part of this field, hydrometallurgy uses chemical fluids (leachates) of acidic or basic pH to dissolve the target metal(s) for subsequent concentration, purification and recovery. The type and concentration of the leach solution is typically controlled to allow selective dissolution of the target metal(s), and other parameters such as oxidation potential, temperature and the presence of complexing/chelating agents. In the remediation industry the use of elemental metals (M0) for the removal of aqueous contaminant species is also a well established process. Removal is achieved by the oxidative corrosion of the M0 and associated pH and/or redox potential change. Whilst the two processes are directly opposed and mutually exclusive they both stem from the same theoretical background: metal dissolution/precipitation reactions. In the mining industry, with each prospective ore deposit physically and chemically unique, a robust series of tests are performed at each mine site to determine optimal hydrometallurgical fluid composition and treatment conditions (e.g. fluid temperature, flow rate) for target metal dissolution/yield. In comparison, within the remediation industry not all such variables are typically considered. In the present communication a comparison of the processes adopted in both industries are presented. The consequent need for a more robust empirical framework within the remediation industry is outlined.
    Keywords: Environmental remediation; Extractive metallurgy; Intrinsic reactivity; Metal dissolution; Zerovalent Metal ; 551
    Language: English
    Type: article , submittedVersion
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  • 5
    Publication Date: 2021-03-29
    Description: There are many factors to consider for the design of appropriate water treatment systems including: cost, the concentration and type of biological and/or chemical contamination, concentration limits at which contaminant(s) are required to be removed, required flow rate, level of local expertise for on-going maintenance, and social acceptance. An ideal technology should be effective at producing clean, potable water; however it must also be low-cost, low-energy (ideally energy-free) and require low-maintenance. The use of packed beds containing metallic iron (Fe0 filters) has the potential to become a cheap widespread technology for both safe drinking water provision and wastewater treatment. Fe0 filters have been intensively investigated over the past two decades, however, sound design criteria are still lacking. This article presents an overview of the design of Fe0 filters for decentralized water treatment particularly in the developing world. A design for safe drinking water to a community of 100 people is also discussed as starting module. It is suggested that Fe0 filters have the potential for significant worldwide applicability, but particularly in the developing world. The appropriate design of Fe0 filters, however, is site-specific and dependent upon the availability of local expertise/materials.
    Description: Open-Access Publikationsfonds 2015
    Keywords: decentralized water treatment; pilot study; water supply; zerovalent iron ; 551
    Language: English
    Type: article , publishedVersion
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