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| Titel |
Cyanobacterial and microcystins dynamics following the application of hydrogen peroxide to waste stabilisation ponds |
| VerfasserIn |
D. J. Barrington, A. Ghadouani, G. N. Ivey |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 17, no. 6 ; Nr. 17, no. 6 (2013-06-05), S.2097-2105 |
| Datensatznummer |
250018891
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| Publikation (Nr.) |
 copernicus.org/hess-17-2097-2013.pdf |
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| Zusammenfassung |
| 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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