Seasonal variation of microcystin concentrations in the Saint-Caprais reservoir (France) and their removal in a small full-scale treatment plant

At the Saint-Caprais reservoir (France), a mono-specific bloom of Aphanizomenon flos-aquae occurs every year in the autumn months. Levels of microcystin-LR (MCYST-LR) in this reservoir were evaluated by protein phosphatase type 2A (PP2A) inhibition test as MCYST-LR equivalents in both raw and drinki...

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Bibliographic Details
Published in:Water research (Oxford) 2002-06, Vol.36 (11), p.2891-2897
Main Authors: Maatouk, Imed, Bouaı̈cha, Noureddine, Fontan, Didier, Levi, Yves
Format: Article
Language:English
Subjects:
Anabaena
Aphanizomenon flos-aquae
Applied sciences
Bacterial Toxins - analysis
Biomass
Carbon
Continental surface waters
Cyanobacteria
Cyanotoxins
Disinfectants
Drinking water and swimming-pool water. Desalination
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental Monitoring
Enzyme Inhibitors - analysis
Eutrophication
Exact sciences and technology
France
Freshwater
Microcystins
Natural water pollution
Neuro-2A cell line
Peptides, Cyclic - analysis
Pollution
Pollution, environment geology
Population Dynamics
PP2A inhibition test
Seasons
Water processing
Water Purification
Water Supply
Water treatment and pollution
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Summary:At the Saint-Caprais reservoir (France), a mono-specific bloom of Aphanizomenon flos-aquae occurs every year in the autumn months. Levels of microcystin-LR (MCYST-LR) in this reservoir were evaluated by protein phosphatase type 2A (PP2A) inhibition test as MCYST-LR equivalents in both raw and drinking water. Analysis by HPLC of the crude extract of the mono-specific bloom of A. flos-aquae revealed the presence of MCYST-LR with a low concentration of 270.3±20.4 ng/g wet weight. MCYST-LR equivalent concentrations in raw water were correlated with the cyanobacteria biomass and they varied between 14 and 74 ng/l. The removal of A. flos-aquae and microcystins were evaluated in a small full-scale plant associated with the Saint-Caprais reservoir. Total elimination of cyanobacterial cells and the low concentration of hepatotoxins was achieved through the combined action of pre-ozonation at 0.07 mg/l and adsorption on powdered activated carbon at 20 mg/l. However, pre-chlorination at 0.42 mg/l followed by 20 mg/l of powdered activated carbon removed only 45% of hepatotoxins.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(01)00507-3