Enhanced removal of heavy metal ions bound to humic acid by polyelectrolyte flocculation

Nicholas P. Hankins, Na Lu, Nidal Hilal

    Research output: Contribution to journalArticle

    Abstract

    The enhanced removal of heavy metal ions from solution, such as Pb2+ and Zn2+, was studied by binding the ions to humic acid (HA) and then coagulating-flocculating with the cationic polyelectrolyte polydiallyldimethylammonium chloride (PolyDADMAC). The effect of the dosage of PolyDADMAC, the pH level and the concentrations of HA and metal ions were studied. Ultrafiltration was used to separate bound metal ions from free ions in solution. The removal of bound metal ions was found to increase with the extent of coagulation-flocculation of the HA by PolyDADMAC. The pH affects the removal efficiency of bound (complexed) metal, in so much as it affects the binding strength of metal ions to the HA. The removal efficiency of metal also increases with the initial concentration of HA. The effective coagulation-flocculation region of the HA by PolyDADMAC is affected by the initial concentration of the metal ions; an increase in the concentration leads to a decrease in the amount of PolyDADMAC required. Humic substances have the advantage of being naturally occurring, and the results indicate that such a complexation-flocculation process is of potential interest for the removal of heavy metals during water treatment.

    Original languageEnglish (US)
    Pages (from-to)48-56
    Number of pages9
    JournalSeparation and Purification Technology
    Volume51
    Issue number1
    DOIs
    StatePublished - Aug 1 2006

    Fingerprint

    Humic Substances
    Flocculation
    Heavy Metals
    Polyelectrolytes
    Heavy ions
    Heavy metals
    Metal ions
    Chlorides
    Coagulation
    Metals
    Ions
    Ultrafiltration
    Complexation
    Water treatment

    Keywords

    • Cationic polyelectrolyte
    • Coagulation
    • Complexation-flocculation
    • Flocculant
    • Flocculation
    • Heavy metal
    • Humic acid
    • Waste water treatment

    ASJC Scopus subject areas

    • Filtration and Separation

    Cite this

    Enhanced removal of heavy metal ions bound to humic acid by polyelectrolyte flocculation. / Hankins, Nicholas P.; Lu, Na; Hilal, Nidal.

    In: Separation and Purification Technology, Vol. 51, No. 1, 01.08.2006, p. 48-56.

    Research output: Contribution to journalArticle

    Hankins, Nicholas P. ; Lu, Na ; Hilal, Nidal. / Enhanced removal of heavy metal ions bound to humic acid by polyelectrolyte flocculation. In: Separation and Purification Technology. 2006 ; Vol. 51, No. 1. pp. 48-56.
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