Destruction of microcystins by conventional and advanced oxidation processes: A review

Publication: Research - peer-reviewJournal article – Annual report year: 2012

  • Author: Sharma, Virender K.

    Center of Ferrate Excellence and Chemistry Department, Florida Institute of Technology,, United States

  • Author: Triantis, Theodoros M.

    Institute of Physical Chemistry, National Center for Scientific Research Demokritos, Greece

  • Author: Antoniou, Maria G.

    Department of Environmental Engineering, Technical University of Denmark

  • Author: He, Xuexiang

    705 Engineering Research Center, University of Cincinnati, United States

  • Author: Pelaez, Miguel

    705 Engineering Research Center, University of Cincinnati, United States

  • Author: Han, Changseok

    705 Engineering Research Center, University of Cincinnati, United States

  • Author: Song, Weihua

    Department of Environmental Science & Engineering, Fudan University, China

  • Author: O’Shea, Kevin E.

    Department of Chemistry and Biochemistry, Florida International Univ, United States

  • Author: de la Cruz, Armah A.

    Office of Research and Development, U.S. Environmental Protection Agency, United States

  • Author: Kaloudis, Triantafyllos

    Organic Micropollutants Laboratory, Athens Water Supply and Sewerage Company (EYDAP SA), Greece

  • Author: Hiskia, Anastasia

    Institute of Physical Chemistry, National Center for Scientific Research Demokritos, Greece

  • Author: Dionysiou, Dionysios D.

    705 Engineering Research Center, University of Cincinnati, United States

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Cyanobacteria blooms pose an environmental hazard because of the release of water soluble toxic compounds, called cyanotoxins. Microcystins (MCs), hepatotoxic cyclic peptide toxins, are the most widespread cyanotoxins with microcystin-LR (MC-LR) the most common and toxic variant. Health effects of MCs have resulted in the need of using efficient treatment methods for the removal of this class of toxins in water supplies. While physical treatment methods can remove MCs at full or some extent from contaminated water, their function is primary separation of the whole toxins as intact molecules and further processing is required. On the other hand, chemical oxidation processes are a promising alternative treatment option due to the potential of complete destruction of the MCs, transformation to less toxic by-products, and even complete mineralization. MCs reactivity towards different conventional oxidants is strongly affected by water quality parameters like pH, DOC and oxidant dose. Although there is a general trend for MCs oxidation (ozone>permanganate>chlorine>>>chlorine-based oxidants), the selection of the appropriate oxidant for toxin elimination during water treatment should be assessed for each particular source of water. Although advanced oxidation processes are generally more effective on MCs degradation than conventional oxidation processes, scale-up studies are needed before these methods are considered as economically-feasible and practical sustainable alternatives in water treatment facilities. In this review, recent literature concerning treatment of MCs in water by conventional and advanced oxidation processes are reviewed and discussed in terms of the degree of degradation, reaction kinetics, identity and toxicity of oxidation by-products and possible degradation pathways.
Original languageEnglish
JournalSeparation and Purification Technology
Publication date2012
Volume91
Pages3-17
ISSN1383-5866
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 18

Keywords

  • Cyanotoxins, Microcystins, Microcystin-LR, Conventional oxidation methods, Advanced oxidation process
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