Hydrogen peroxide, an ecofriendly remediation method for controlling Microcystis aeruginosa toxic blooms

2020 ◽  
Vol 32 (5) ◽  
pp. 3133-3142
Author(s):  
I. Shuo Huang ◽  
Paul V Zimba
Keyword(s):  
Hydrogen Peroxide ◽  
Microcystis Aeruginosa ◽  
Toxic Blooms

scholarly journals The Effects of Hydrogen Peroxide on the Circadian Rhythms of Microcystis aeruginosa

PLoS ONE ◽  
2012 ◽  
Vol 7 (3) ◽  
pp. e33347 ◽  
Author(s):  
Haifeng Qian ◽  
Baolan Hu ◽  
Shuqiong Yu ◽  
Xiangjie Pan ◽  
Tao Wu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Circadian Rhythms ◽  
Microcystis Aeruginosa

scholarly journals Cianobactérias e Toxicidade: Impacte na Saúde Pública em Portugal e no Brasil (Cyanobateria and Toxicity: Public Health Impact in Portugal and Brazil)

2013 ◽  
Vol 5 (6) ◽  
pp. 1374
Author(s):  
Fernando Bellém ◽  
Susana Nunes ◽  
Manuela Morais ◽  
Rita Fonseca
Keyword(s):  
Public Health ◽  
Microcystis Aeruginosa ◽  
Health Impact ◽  
Acute Poisoning ◽  
Minas Gerais ◽  
Mitigation Measures ◽  
Public Health Impact ◽  
Cyanobacteria Bloom ◽  
Cyanobacteria Blooms ◽  
Toxic Blooms

Um aumento da concentração de nutrientes na água poderá desencadear fluorescências de cianobactérias (densidades >200 cel/mL). Sob determinadas condições as cianobactérias produzem toxinas responsáveis pelo envenenamento de animais e humanos. O objetivo deste estudo é relacionar a ocorrência de fluorescências toxicas em Portugal e no Brasil. Para tal, em 2005 e 2006 foi estudado o fitoplâncton em três reservatórios em Portugal (região sul) e dois no Brasil (Minas Gerais e Pará). Comparativamente foi verificado maior diversidade nos reservatórios portugueses, com dominância de cianobactérias em período de primavera/verão/outono, pertencentes a géneros produtores de hépato e neurotoxinas (Microcystis sp, Aphanizomenon sp, Oscillatoria sp e Planktothrix sp.). No Brasil observou-se dominância de cianobactérias ao longo de todo o ano, com presença de Microcystis aeruginosa, produtora de hepatotoxina. Conclui-se que os reservatórios estudados apresentam géneros produtores de toxinas, com risco para a saúde pública, sendo fundamental implementar medidas que contribuam para mitigar esta situação. Palavras-chave: cianobactérias; fluorescências; toxinas; saúde pública  Cyanobateria and Toxicity: Public Health Impact in Portugal and Brazil  ABSTRACT An increasing of nutrients in water can conduct to the development of cyanobacteria blooms (density>2000 cels/mL). Under specific conditions cyanobacteria produce toxins responsible for acute poisoning of animals and humans. The aim of this study is to describe toxic blooms in Portugal and Brazil. Therefore, phytoplankton from three Portuguese reservoirs (South region) and two from Brazil (Minas Gerais and Pará) were studied in 2005 and 2006. Portuguese reservoirs showed more diversity with dominance of hepatic and neurotoxin genera producers (Microcystis sp, Aphanizomenon sp, Oscillatoria sp e Planktothrix sp.) along spring/summer/autumn seasons. In Brazil dominance of cyanobacteria was observed all along the year with the presence of Microcystis aeruginosa hepatotoxic producer. The studied reservoirs present toxins producers’ genera, with risk for public health, being fundamental the implementation of mitigation measures to reverse this situation.Keywords: cyanobacteria; bloom; toxins; public health

scholarly journals Combined treatment of toxic cyanobacteria Microcystis aeruginosa with hydrogen peroxide and microcystin biodegradation agents results in quick toxins elimination

2018 ◽  
Vol 65 (1) ◽  
pp. 133-140 ◽  
Author(s):  
Dariusz Dziga ◽  
Anna Maksylewicz ◽  
Magdalena Maroszek ◽  
Sylwia Marek
Keyword(s):  
Hydrogen Peroxide ◽  
Secondary Metabolites ◽  
Microcystis Aeruginosa ◽  
Combined Treatment ◽  
Cell Lysis ◽  
Water Reservoirs ◽  
Promising Alternative ◽  
Toxic Cyanobacteria ◽  
Algicidal Compounds

In some conditions the growth of toxic cyanobacteria must be controlled by treatment with algicidal compounds. Hydrogen peroxide has been proposed as an efficient and relatively safe chemical which can remove cyanobacteria from the environment selectively, without affecting other microorganisms. However, the uncontrolled release of secondary metabolites, including toxins may occur after such a treatment. Our proposal presented in this paper is fast biodegradation of microcystin released after cell lysis induced by hydrogen peroxide. The effectiveness of both Sphingomonas sp. and heterologously expressed MlrA enzyme in the removal of the toxin from Microcystis aeruginosa culture has been investigated. The results indicate that neither Sphingomonas cells nor MlrA are affected by hydrogen peroxide in the concentrations which stop the growth of cyanobacteria. A several-fold microcystin reduction was documented in the presence of these agents with biodegradation ability. Our results provide evidence that such a combined treatment of water reservoirs dominated by microcystin-producing cyanobacteria may be a promising alternative which allows fast elimination of toxins from the environment.

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