Disposal of water treatment wastes containing arsenic—a review

Colin Sullivan, Mark Tyrer, Christopher R Cheeseman, Nigel JD Graham

    Research output: Contribution to journalArticle

    111 Citations (Scopus)

    Abstract

    Solid waste management in developing countries is often unsustainable, relying on uncontrolled disposal in waste dumps. Particular problems arise from the disposal of treatment residues generated by removing arsenic (As) from drinking water because As can be highly mobile and has the potential to leach back to ground and surface waters. This paper reviews the disposal of water treatment wastes containing As, with a particular emphasis on stabilisation/solidification (S/S) technologies which are currently used to treat industrial wastes containing As. These have been assessed for their appropriateness for treating As containing water treatment wastes. Portland cement/lime mixes are expected (at least in part) to be appropriate for wastes from sorptive filters, but may not be appropriate for precipitative sludges, because ferric flocs often used to sorb As can retard cement hydration. Brine resulting from the regeneration of activated alumina filters is likely to accelerate cement hydration. Portland cement can immobilise soluble arsenites and has been successfully used to stabilise As-rich sludges and it may also be suitable for treating sludges generated from precipitative removal units. Oxidation of As(III) to As(V) and the formation of calcium–arsenic compounds are important immobilisation mechanisms for As in cements. Geopolymers are alternative binder systems that are effective for treating wastes rich in alumina and metal hydroxides and may have potential for As wastes generated using activated alumina. The long-term stability of cemented, arsenic-bearing wastes is however uncertain, as like many cements, they are susceptible to carbonation effects which may result in the subsequent re-release of As.
    Original languageEnglish
    Pages (from-to)1770-1778
    Number of pages9
    JournalScience of the Total Environment
    Volume408
    Issue number8
    Early online date13 Feb 2010
    DOIs
    Publication statusPublished - 15 Mar 2010

    Fingerprint

    Arsenic
    Water treatment
    Waste disposal
    arsenic
    cement
    Cements
    Activated alumina
    aluminum oxide
    sludge
    Portland cement
    Arsenites
    hydration
    Hydration
    waste water treatment
    Bearings (structural)
    Hydroxides
    Geopolymers
    filter
    Industrial Waste
    Carbonation

    Keywords

    • Arsenic
    • Water pollution
    • Stabilisation/solidification
    • Portland cement
    • Leaching

    Cite this

    Disposal of water treatment wastes containing arsenic—a review. / Sullivan, Colin; Tyrer, Mark; Cheeseman, Christopher R; Graham, Nigel JD.

    In: Science of the Total Environment, Vol. 408, No. 8, 15.03.2010, p. 1770-1778.

    Research output: Contribution to journalArticle

    Sullivan, Colin ; Tyrer, Mark ; Cheeseman, Christopher R ; Graham, Nigel JD. / Disposal of water treatment wastes containing arsenic—a review. In: Science of the Total Environment. 2010 ; Vol. 408, No. 8. pp. 1770-1778.
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