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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 6 | Copyright
Hydrol. Earth Syst. Sci., 17, 2097-2105, 2013
https://doi.org/10.5194/hess-17-2097-2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 05 Jun 2013

Research article | 05 Jun 2013

Cyanobacterial and microcystins dynamics following the application of hydrogen peroxide to waste stabilisation ponds

D. J. Barrington1, A. Ghadouani1, and G. N. Ivey2 D. J. Barrington et al.
  • 1Aquatic Ecology and Ecosystem Studies, M015, School of Environmental Systems Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, Australia
  • 2Geophysical Fluid Dynamics, M015, School of Environmental Systems Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, Australia

Abstract. Cyanobacteria and cyanotoxins are a risk to human and ecological health, and a hindrance to biological wastewater treatment. This study investigated the use of hydrogen peroxide (H2O2) for the removal of cyanobacteria and cyanotoxins from within waste stabilization ponds (WSPs). The daily dynamics of cyanobacteria and microcystins (commonly occurring cyanotoxins) were examined following the addition of H2O2 to wastewater within both the laboratory and at the full scale within a maturation WSP, the final pond in a wastewater treatment plant. Hydrogen peroxide treatment at concentrations ≥ 0.1 mg H2O2 μg−1 total phytoplankton chlorophyll a led to the lysis of cyanobacteria, in turn releasing intracellular microcystins to the dissolved state. In the full-scale trial, dissolved microcystins were then degraded to negligible concentrations by H2O2 and environmental processes within five days. A shift in the phytoplankton assemblage towards beneficial Chlorophyta species was also observed within days of H2O2 addition. However, within weeks, the Chlorophyta population was significantly reduced by the re-establishment of toxic cyanobacterial species. This re-establishment was likely due to the inflow of cyanobacteria from ponds earlier in the treatment train, suggesting that whilst H2O2 may be a suitable short-term management technique, it must be coupled with control over inflows if it is to improve WSP performance in the longer term.

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