The removal of copper in water using manganese activated saturated and unsaturated sand filters

Chedly Tizaoui, Sugihhartati Dj Rachmawati, Nidal Hilal

    Research output: Contribution to journalArticle

    Abstract

    Activated unsaturated sand filter (AUSF) is one among the few of the filtration technologies utilised to treat metal bearing waters. AUSF utilises activated sand as its filter media and operates under naturally flowing air to ensure unsaturated condition. In this study, manganese-activated sand was used for the removal of copper. Activation of the sand increased its BET surface area by 21% at 0.071. mg Mn/g sand and Mn leaching was significant only at pH < 4.5. SEM/EDS showed clusters of crystalline manganese oxides coating the sand surface and newborn copper hydroxides occupying sand surface after exposure to copper-bearing-water. A tracer study revealed that the gas voidage in the filter increased from 0.143 to 0.294 as the water flow rate reduced from 74.4 to 16.4. mL/min, which ensured better water aeration and increased copper removal. The ratio of manganese to sand was a key parameter as it increased almost exponentially the removal capacity of the AUSF. On the other hand, copper removal increased linearly with the inverse of the sand particle size, which indicates the importance of the surface area in the process. However, unexpectedly, when the inlet copper concentration increased from 3 to 20. mg/L, the filter capacity reduced by about 50% from 0.020 to 0.011. mg Cu/g sand. Based on the results obtained, mechanisms by which copper was removed in AUSF were proposed and they were found to vary as function of time [electrostatic attraction (t< 2. min); precipitation (t< 3.8. min), and adsorption/ion exchange (t< 60. min)].

    Original languageEnglish (US)
    Pages (from-to)334-344
    Number of pages11
    JournalChemical Engineering Journal
    Volume209
    DOIs
    StatePublished - Oct 5 2012

    Fingerprint

    Manganese
    Copper
    manganese
    Sand
    copper
    filter
    sand
    Water
    water
    Bearings (structural)
    removal
    surface area
    Water aeration
    Manganese oxide
    manganese oxide
    Leaching
    hydroxide
    Energy dispersive spectroscopy
    Electrostatics
    water flow

    Keywords

    • Activated unsaturated sand filter
    • Adsorption
    • Copper removal
    • Electrostatic attraction
    • Manganese
    • Precipitation

    ASJC Scopus subject areas

    • Chemistry(all)
    • Environmental Chemistry
    • Chemical Engineering(all)
    • Industrial and Manufacturing Engineering

    Cite this

    The removal of copper in water using manganese activated saturated and unsaturated sand filters. / Tizaoui, Chedly; Rachmawati, Sugihhartati Dj; Hilal, Nidal.

    In: Chemical Engineering Journal, Vol. 209, 05.10.2012, p. 334-344.

    Research output: Contribution to journalArticle

    Tizaoui, Chedly ; Rachmawati, Sugihhartati Dj ; Hilal, Nidal. / The removal of copper in water using manganese activated saturated and unsaturated sand filters. In: Chemical Engineering Journal. 2012 ; Vol. 209. pp. 334-344.
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